NARDA 8718B manual

USER'S GUIDE Model 8718B Electromagnetic Radiation Survey Meter P/N 42983600 RevB nar da Safety T est Solutions an communications company L 3[...]

1 Chapter 1 Introduction 1 Introduction About the Model 8718B Your Model 8718B is a hand-held, battery-powered meter designed to simplify the measurement of electromagnetic fields. It can be used with any Narda 8700 Series probe. The 8718B is an upgraded version of the original Model 8718. Although there are many enhancements, the 8718B is most eas[...]

2 Operating the Meter User’s Guide Updates This User’s Guide was thoroughly reviewed for accuracy prior to publication. Corrections to this guide necessitated by errors or omissions or by minor revisions to the meter firmware will be covered in the README file enclosed with the User's Software . The README file is available at any time fro[...]

3 Chapter 2 Understanding Your Model 8718B 2 Understanding Your Model 8718B General Description It is important to be familiar with the Model 8718B before y o u use it. This section includes descriptive data keyed to highlighted illustrations to help you locate the various features of the meter. The descriptions not only identify the features but t[...]

4 Operating the Meter Probe Connection To make measurements, you must use your Model 8718B with a compatible probe. Connect the cable of the probe to the probe connector located at the top of the unit. If you use a fiber optic link, the probe connects to a fiber optic transmitter. A fiber optic cable connects the transmitter to the rectangular fibe[...]

5 Chapter 2 Understanding Your Model 8718B Strap and Tripod Mount A strap is provided on the underside of the Model 8718B. It has a hook and loop closure to permit easy adjustment, around your hand. Behind the strap is a threaded connector used to secure the meter to a tripod. Loosen the strap to access this connector. Operation With a Computer To [...]

6 Operating the Meter Keypad The Model 8718B has four groups of keys distinguished by their color. Function keys (green) Numeric keys (yellow) Special Function keys (white) Power keys (blue, green) Power Keys Two power keys are used to turn the Model 8718B On and Off . Function Keys Use the four function keys ( F1-F4 ) to select the options display[...]

7 Chapter 2 Understanding Your Model 8718B Numeric Keypad Use the numeric keypad to enter number data into the Model 8718B. You also use the numeric keypad to select a numbered option listed on the display screen. Special Function Keys Six special function keys enable you to perform specific functions. Esc Returns you to the previous menu. In a few[...]

8 Operating the Meter[...]

9 Chapter 3 Probe Selection Introduction The 8700 series RF measurement system offers a very broad selection of probes. The factors that you should consider in selecting the probe, or probes, best suited for your task are described in this section. 3 Probe Selection The probe frequency range should include the frequencies of all the emitters to be [...]

10 Operating the Meter Flat response probes are the most common. Narda’s patented shaped frequency response probes read out in Percent of Standard and are particularly useful in complex, multi-signal environments where exposure limits are different for the various emitter frequencies and in classified environments. The majority of the 8700 series[...]

11 Chapter 3 Probe Selection The readout on the 8718B is shown in terms of Percent of Standard . The full scale of Narda’s shaped probes is typically either 300% or 600% of a standard. This permits measurements of exposure environments where the weighted field strengths range from as high as three to six times the maximum permissible exposure (MP[...]

12 Operating the Meter Probe Identification Narda 8700D series probes use the following labels and indicators: • Certified Calibration Date Label • Model Identification Label • Color Band to Indicate the Full Scale Measurement Range (20 mW/cm 2 probes do not have a colored band) • Calibration Label With Frequency Correction Factors Field Ty[...]

13 Chapter 4 Making a Measurement 4 Making a Measurement See Chapter 5, Using the Menu System , for details on features and operation. Introduction This chapter will help you make measurements with your Model 8718B. Information is included for turning the meter on, selecting, zeroing, and testing a probe, plus an explanation of the main measurement[...]

14 Operating the Meter Entering the Probe Model Narda's 8700 Series system is completely modular — all 8700 series meters work with all 8700 series probes. The single most important thing you must do is tell the 8718B meter which probe you are using. The Model 8718B has the basic characteristics of every 8700 Series probe stored in its inter[...]

15 Chapter 4 Making a Measurement To select from the PROBES IN MEMORY... 1. If you haven’t already, press F1 (MEASURE). 2. The model number and the serial number of the last probe used will be displayed on the second line of the display. If you want to use the same probe, press Enter. 3. If you want to use a different probe, look for the model nu[...]

16 Operating the Meter To use a PROBE that is NOT IN MEMORY... 1. If you haven't already, press F1 (MEASURE) . 2. The model number of the last probe used will be displayed on the second line of the display. If you want to use the same model probe, press Enter . 3. If you want to use a different model probe, select PROBE by pressing F4 . If mor[...]

17 Chapter 4 Making a Measurement Zeroing the Probe The probe and meter must be “zeroed” together. It is important that the probe is not exposed to radiated fields during the zeroing process. The storage case is shielded and provides a convenient “zero density” environment. To zero the probe... 1. Place the probe in the storage case. Be car[...]

18 Operating the Meter • The field strength is not low enough. Move away from the RF field source, use the storage case to zero the probe. • The probe is damaged . Try another probe. To reconfirm the zero while the instrument is in use... 1. Establish a zero density environment for the probe as before. 2. Press the Auto Zero key. This will auto[...]

19 Chapter 4 Making a Measurement Main Measurement Display Screen (Shaped Probes) 12 . 1 % S T D 2 7.5 M A X C F 1.0 0 AL T M A X R M E N U F R E Q F1 F2 F3 F4 FIELD STRENGTH • Indicates actual measured value • Unit of measure is always % STD for shaped frequency response probes BAR GRAPH • Indicates approximate field strength • 100 segment[...]

20 Operating the Meter Alternate Measurement Display Screen The Alternate Measurement Display Screen is very similar to the Main Measurement Display Screen with one difference. This display mode is used to show frequency-specific, real time information on the third line of the display instead of a maximum value. It should be used only for single fr[...]

21 Chapter 4 Making a Measurement Alternate Measurement Display Screen (Shaped Probes) FIELD STRENGTH • Indicates actual measured value • Unit of measure can be changed by going to the First Menu Screen Alternate Measurement Display Screen (Flat Probes) The Alternate Measurement Display Screen for flat frequency response probes is the same as t[...]

22 Operating the Meter 4. Change the units (if needed) by pressing either F1 ( kHz), F2 ( MHz ), or F3 ( GHz ). 5. Press F4 ( SAVE ). The probe correction factor will be displayed briefly if you are using a probe in memory and you will automatically return to the measurement screen. Se e Using Probe Correction Factors on page 24. 6. From the Main M[...]

23 Chapter 4 Making a Measurement Bar Graph Ranges The Range key is used to control how the bar graph displays information. The digital display is not affected and the meter automatically displays a digital value over the probe’s entire measurement range. There are four available settings: AUTO, HIGH, MID, and LOW . The bar graph has 100 division[...]

24 Operating the Meter get a deflection on the bar graph but the amount of deflection is not important. Repeat for the other two test points to insure that the probe is working correctly. The D series magnetic field probes have a single, conductive test point that is used to simultaneously test all three sensors. A microwave window on the right sid[...]

25 Chapter 4 Making a Measurement • When there are multiple emitters with frequencies that are close to each other and the nearest calibration frequencies have very similar correction factors. Correction factors should NOT be used: • When the frequencies of the emitters are diverse. Correction factors may vary considerably and there is no way t[...]

26 Operating the Meter To use a correction factor for a probe NOT in memory... 1. Press F3 ( MENU ). The First Menu Screen will appear. 2. Press 8 ( NEXT ) to access the Second Menu Screen . 3. Press 1 ( COR FACT ). A screen will appear that shows the correction factor. 4. Use the correction factors on the handle of the probe to determine the appro[...]

27 Chapter 4 Making a Measurement Measurement Uncertainty The uncertainty of any measurement includes several factors related to the probe and meter. • Frequency response or frequency sensitivity is typically ±1 dB to ±2 dB (from about ±25% to about ±55%). The correct use of correction factors can greatly reduce the amount of uncertainty asso[...]

28 Operating the Meter Making a Measurement Refer to the Applications Booklet for both general and specific information on making measurements. Precautions When making measurements of electromagnetic fields, a potential exists to expose yourself to excessive levels. Approach the source of energy slowly and begin making measurements from a distance [...]

29 Chapter 5 Using the Menu System 5 Using the Menu System General The menu system allows you to store data and to select various operating modes. It is accessed by pressing the appropriate function key that corresponds to MENU on the bottom line of the display screen. The menu is comprised of two menu screens and several sub-menus. Press the numbe[...]

30 Operating the Meter 1D A T A L O G 5U N I T S 2 T IM E A V G 6 R S 232 3 SPA T I A L 7 P R O BE 4 BAT / L I FE 8 N EXT F1 F2 F3 F4 Key Menu Options Chapter 1 DATA LOG Log with time and date stamp. Log spatially averaged values with time and date stamp. Continuous logging at various rates. 8 2 TIME AVG Turn fixed time averaging (various duration)[...]

31 Chapter 5 Using the Menu System Second Menu Screen 1C O R A FC T 5 A L A R M 2S E T T N IG S 6 S T N D S 3C A B L E / F O 7 B L A N K 4L O C K O U T 8 B A C K F1 F2 F3 F4 Key Menu Options Chapter 1 COR FACT Enter a numeric probe correction factor. 4 2 SETTINGS Check or set the meter’s internal clock (time/date) Enter a value for temperature. U[...]

32 Operating the Meter Menu Commands The following is a list of menu commands that are shown on the fourth line of the display and selected by using the four function keys ( F1-F4 ). AUTO Auto – returns the meter to the normal, automatic temperature correction mode. ABORT Abort clearing the memory BEGIN Begin – confirms that the meter is ready [...]

33 Chapter 5 Using the Menu System MAIN Main – switch to the Main Measurement Display Screen. MAXR Maximum Reset - reset the maximum value to the instantaneous value. MEASURE Measure – begin the measurement process by selecting and zeroing the probe. MEM Memory – display the available memory. MENU Menu – access the First Menu Screen . MIN M[...]

34 Operating the Meter Default Conditions Upon Turn-On The Model 8718B is designed to automatically return to a basic set of operating parameters every time it is turned on. Although in some cases this may require additional key strokes to set up the meter as desired, this feature is designed to minimize the chance of making measurements while unkn[...]

35 Chapter 5 Using the Menu System Time Averaging OFF Unit of Measure Last Used unit of measure will be in use if previous and current probe both have flat or shaped frequency response. If current probe is shaped, unit will be % of STD. If current probe is flat and previous probe was shaped, then unit will be mW/cm 2 .[...]

36 Operating the Meter[...]

37 Chapter 6 Units of Measure 6 Units of Measure Available Units of Measure The 8718B Meter allows you to quickly select any unit of measure that is appropriate for the probe in use. The available units of measure depend on whether the probe is designed to measure the electric field or the magnetic field. It also depends on whether the probe has a [...]

38 Operating the Meter Changing the Unit of Measure To change the unit of measure that the meter is set for ... 1. Access the menu system by pressing the function key that corresponds to the legend below MENU on the bottom line of the display. 2. Press the number 5 on the keypad to select UNITS from the First Menu Screen . A screen will appear that[...]

39 Chapter 7 Spatially-Averaged Measurements Spatially Averaged Measurements 7 Understanding Spatial Averaging The major standards concerned with human exposure to radio frequency radiation specify maximum exposure levels averaged over the whole body. The co-linear dipole antenna arrays that are very common in modern wireless communications systems[...]

40 Operating the Meter Spatial Averaging with the 8718B The Model 8718B uses time to quickly make precise, spatially averaged measurements. With the 8718B set for spatial averaging, press the F1 function key to start the timer. Pressing the same key again stops the timer. During this interval of time, the meter takes a large number of measurements.[...]

41 Chapter 7 Spatially-Averaged Measurements 6. Press F1 (START) while slowly moving the probe vertically at a constant rate of movement. 7. Strive for an interval of about ten seconds between starting and stopping the timer. The meter will beep every second as a timing aid. 8. When the probe reaches the height equal to the top of an adult’s head[...]

42 Operating the Meter 10. To make another spatially averaged measurement, press F1 ( START ) again. 11. To temporarily suspend the spatial average mode and make real time measurements, press F2 ( CLR ). To make another spatially-averaged measurement, press F1 ( START ) again. 12. To end spatial averaging altogether, press F4 ( QUIT ). The meter wi[...]

43 Chapter 8 Data Logging 8 Data Logging Logging Options The 8718B Meter features several methods of collecting data. The basic choices are: • Logging Data with the Meter. The logged data stored in the meter is downloaded to a computer at a later date using the User's Software , where it can be viewed and printed. The data can also be export[...]

44 Operating the Meter • Collect a series of up to 999 spatially-averaged data points, one at a time, and automatically assign a reference number to each data point. Both the average value and the maximum value at each location are stored. The reference numbers can refer to either site plan locations or to a diagram of the industrial equipment be[...]

45 Chapter 8 Data Logging To initiate one of the three logging modes described above... 1. Access the menu system by pressing the function key that corresponds to the legend below MENU on the bottom line of the display. 2. Press the number 1 on the keypad to select DATA LOG from the First Menu Screen . 3. A new menu will appear, presenting the thre[...]

46 Operating the Meter Mode 1 Logging To initiate Mode 1 logging (a series of data points with a reference number assigned to each data point)... 1. Press the number 1 on the keypad to select LOG WITH REF # from the logging menu screen. 2. A screen will appear requesting that you assign a two- digit survey number to this logging run of data points.[...]

47 Chapter 8 Data Logging 6. A screen will appear that indicates the value of reading that has been temporarily stored in memory and the number of the data point. The first data point will be 001 . 7. Press F1 ( SAVE) to permanently log this data point into the meter’s memory with its associated data point number. The meter will automatically ret[...]

48 Operating the Meter 13. Use the numeric keypad to enter a new two-digit survey number and then press F1 ( OK )o r ENTER . Again, make note of this number so that you can later associate this survey number with the data points collected. If you make a mistake, press F2 ( CLR )t o clear the screen and enter a new survey number. The meter will auto[...]

49 Chapter 8 Data Logging 3. Press F4 ( QUIT )o r F3 ( MENU ) if you change your mind. 4. The meter will automatically return to the measurement screen with new options available for the function keys. 5. Proceed to make measurements as normal. To initiate making a spatially-averaged measurement that will be logged, hold the meter in one hand and t[...]

50 Operating the Meter D A T A P O I N T N O . 001 12 . 1 % S T D A V G 27 . 5 % S T D M A X SAVE D I SC AR D F1 F2 F3 F4 10. Press F1 ( SAVE) to permanently log this data point into the meter’s memory with its associated data point number. The meter will automatically return to the logged measurement screen. 11. Press F3 ( DISCARD) to erase the [...]

51 Chapter 8 Data Logging 15. To end this logging run and begin a new run, press F3 ( END ). The screen will appear that allows you to enter another two-digit survey number. 16. Use the numeric keypad to enter a new two-digit survey number and then press F1 ( OK )o r ENTER . Again, make note of this number so that you can later associate this surve[...]

52 Operating the Meter 2. A screen will appear requesting that you assign a two- digit survey number to this logging run of data points. Use the numeric keypad to enter the two-digit number and then press F1 ( OK )o r ENTER . Make note of this number so that you can later associate this survey number with the data points collected. 3. A new menu sc[...]

53 Chapter 8 Data Logging 6. To log for a specific interval of time, enter a two-digit number on the keypad. If you make a mistake entering a number, simply continue entering numbers until the correct value is displayed. Then press either F1 ( SEC ), F2 ( MIN ), or F3 ( HRS ) and the meter will automatically return to the measurement screen with ne[...]

54 Operating the Meter To begin another logging run at a different rate or for a different duration... • Press F3 ( MENU ). Press the number 1 on the keypad to select DATA LOG from the First Menu Screen and proceed as previously described. To end logging altogether and return to the standard measurement screen... • Press F4 ( QUIT ). To initiat[...]

55 Chapter 8 Data Logging A record contains a header and one or more data points. To estimate the approximate number of data points and records (logging runs) that can be stored with the available memory ... 1. Allocate 33 bytes for each header. A separate header is used for each record. 2. Allocate 7 bytes for each data point from Mode 1 and Mode [...]

56 Operating the Meter 7. To discard the contents of the meter’s memory once the contents have been downloaded or without saving the information, access the menu system by pressing the function key that corresponds to the legend below MENU on the bottom line of the display. 8. Press 8 ( NEXT ) to get to the Second Menu Screen . 9. Press 2 ( SETTI[...]

57 Chapter 9 Time-Averaged Measurements 9 Time-Averaged Measurements Measurement Options The 8718B meter features two averaging modes: • Perform fixed-time averaging over any one of several specific time intervals. • Perform averaging to meet the requirements of a specific standard. The averaging period is automatically set by meter. Making Tim[...]

58 Operating the Meter Mode 1 Averaging To initiate Mode 1 averaging (fixed time averaging over any one of several specific time intervals)... 1. Press number 1 on the keypad to select FIXED TIME from the averaging menu screen. Selecting Mode 1 averaging will automatically shut off Mode 2 averaging if it is on. 2. A new menu screen will appear that[...]

59 Chapter 9 Time-Averaged Measurements 5. The meter will continue to make real-time measurements until you initiate making the time- averaged measurement. 6. Determine where you want to make the averaged measurement and place or hold the probe in the desired position. For short intervals, it may be practical to hold the meter in one hand and the p[...]

60 Operating the Meter 11. To make another time-averaged measurement over the same interval, press F1 ( START ) again. 12. To temporarily suspend the time average mode (once the current measurement interval has been completed or stopped) and make real time measurements, press F2 ( CLR ). To make another time-averaged measurement over the same inter[...]

61 Chapter 9 Time-Averaged Measurements The PAUSE feature can be useful when measuring the aver - age value from cer - tain rotating radars. The effective mea - surement technique requires you to pause during the pe - riod of time when you are not in the beam of the radar. Continue this technique for two or more revolutions (de- pending on the RPM)[...]

62 Operating the Meter To set the meter for a specific frequency... 1. Press F4 ( FREQ ) from the measurement screen. A new screen will appear to allow you to enter a frequency. 2. Enter the frequency that you want to use for the time- averaged measurements. Make sure you fill in all four positions. If you make a mistake just enter more digits unti[...]

63 Chapter 9 Time-Averaged Measurements To initiate Mode 2 averaging (averaging to meet the requirements of a specific standard)... 1. Make sure that the meter is set for the correct standard or change it if needed. See Chapter 11, Using the Standards Feature . 2. Make sure the meter is set to the correct frequency for the measurement you are makin[...]

64 Operating the Meter 7. The meter will continue to make real time measurements until you initiate making the time- averaged measurement. 8. Press F1 ( START) when you are ready to begin the time-averaged measurement. 9. The averaged value is displayed on the screen and will flash every second each time it is updated. The meter will automatically [...]

65 Chapter 9 Time-Averaged Measurements 13. To temporarily suspend the time average mode (once the current measurement interval has been completed or stopped) and make real time measurements, press F2 ( CLR ). To make another time-averaged measurement under the same conditions, press F1 ( START ) again. 14. To end time averaging altogether and retu[...]

66 Operating the Meter To change the frequency... 1. To change the frequency (once the current measurement interval has been completed or stopped), press F2 ( CLR ) if the averaged value is displayed. 2. Once the meter is displaying real time values, the frequency menu is accessed by pressing F3 ( FREQ ). 3. Proceed as previously described to set t[...]

67 Chapter 10 Alarm Settings 10 Alarm Settings Alarm Description The Model 8718B Meter is equipped with an audible alarm that emits sound through a tiny hole on the bottom of the meter. The alarm sounds automatically whenever the field strength exceeds the measurement range of the probe or over ranges . The meter can also be set to sound its alarm [...]

68 Operating the Meter 4. The left side of the display gives the status of the fixed alarm. It indicates whether the fixed alarm is either on or off and the current alarm threshold setting in terms of percent of full scale of the probe in use (1% to 99%). 5. The right side of the display indicates whether the variable tone alarm is either on or off[...]

69 Chapter 10 Alarm Settings Variable Tone Alarm 1. Use F3 ( ON )o r F4 ( OFF ) to change the status of the fixed alarm. The variable tone alarm constantly generates a series of tones that increase in frequency in direct proportion to field strength. 2. If you want to turn the fixed alarm on or off , do that next See Fixed Alarm on the previous pag[...]

70 Operating the Meter[...]

71 Chapter 11 Using the RF Exposure Standards Feature 11 Using The RF Exposure Standards Feature Application The Model 8718B Meter is always set to reference a particular safety standard, regulation, or guidance. The 8718B uses the referenced standard in two ways: • The Alternate Measurement Display Screen displays additional information about th[...]

72 Operating the Meter Many standards have more than one tier, i.e., IEEE C95.1-1999 establishes different Maximum Permissi - ble Exposure (MPE) levels and averaging times for Controlled Environments and for Uncontrolled Envi - ronments. N ote I E E E C 95 . 1 - 1999 C O NTR OL L ED E NV I R OK S T ND S F1 F2 F3 F4 5. Press F1 ( OK ) to continue us[...]

73 Chapter 11 Using the RF Exposure Standards Feature 9. Press F1 ( OK ) to begin using this standard as a reference. 10. Alternately, press F4 ( STNDS ) to select another standard. For standards with two or three tiers... 11. A new screen will appear that lists the complete standard number at the top of the display. The available tiers will be lis[...]

74 Operating the Meter[...]

75 Chapter 12 Back Light and Battery Status 12 Back Light and Battery Status Application for Back Light The liquid crystal display (LCD) on the Model 8718B Meter provides high contrast in bright outdoor lite. However, LCD’s do not generate any light and can be difficult to read in low light conditions. The LCD on the 8718B contains a high brightn[...]

76 Operating the Meter Battery Capacity The Model 8718B Meter uses a custom rechargeable battery. Under normal conditions, the battery provides about 20 hours of use before it must be recharged. The two features on the 8718B that significantly increase the current draw and therefore reduce the operating time are the back light and the RS232 serial [...]

77 Chapter 12 Back Light and Battery Status 4. Press the ESC key to return to the First Menu Screen . Press it again to return to the measurements screen. Accuracy of Battery Status Indicator The characteristics of Ni-Cad rechargeable batteries make it difficult to provide a truly accurate indication of charge level. This is because there is very l[...]

78 Operating the Meter[...]

79 Chapter 13 Keypad Lockout and Display Blanking 13 Keypad Lockout and Display Blanking Description The Lockout feature disables the keypad to prevent inadvertent changes in operation. This feature can be useful while climbing and/or if the meter is left unattended during a long data logging session. The Blank feature both disables the keypad and [...]

80 Operating the Meter Display Blanking and Keypad Lockout To both blank the display and lock the keypad... 1. Access the menu system by pressing the function key that corresponds to the legend below MENU on the bottom line of the display. 2. Press number 8 ( NEXT ) to select the Second Menu Screen . 3. Press 7 to select BLANK . 4. The meter will a[...]

81 Chapter 14 Probe Zero 14 Probe Zero Understanding the Zero Function The purpose of “zeroing” the probe and meter is to set the meter to indicate a zero field strength when there is no measurable field strength. The Narda 8700 series survey system maintains measurement accuracy under all conditions by insuring that all probes always provide t[...]

82 Operating the Meter Causes of Zero Drift All sensors have a change in output that is a function of temperature. In a probe, it is both the thermal coefficient of the detector and the gain of the probe amplifier that determine how much a probe drifts over temperature. Thermal compensation circuitry in the probe is used to minimize the impact of t[...]

83 Chapter 14 Probe Zero • Whenever the meter continues to show low-level values and never seems to get back to a zero-field condition, positive zero drift is a possibility . This can be confirmed by shielding the probe to see if the meter goes back to a zero reading. See Shielding the Probe on the following page for suggested methods. Temperatur[...]

84 Operating the Meter Shielding the Probe The probe must be shielded from significant RF fields whenever it is zeroed with the meter. This is to establish a zero reference for the field. There are four ways to shield the probe during zeroing: • Use the Model 8713B Electric Field Attenuator supplied with the meter. This conductive fabric is the s[...]

85 Chapter 14 Probe Zero Zeroing the Probe While In Use The meter and probe are initially zeroed before the meter is allowed to go into the measurement mode. If you determine that significant drift may have occurred, it is simple to fine tune the zero. See Checking for Zero Drift on page 82 . To zero the probe while in use... 1. Shield the probe us[...]

86 Operating the Meter[...]

87 Chapter 15 Advanced Settings 15 Advanced Settings Description The Settings menu is used to control several features of the Model 8718B that need to be accessed infrequently. The options available under the Settings menu are: • Check or set the meter’s internal clock (time/date). • Enter a value for temperature. This feature is used only wh[...]

88 Operating the Meter Setting the Clock To check and/or change the time and date... 1. Access the settings menu by following the procedure described in Accessing the Settings Menu . 2. Press 1 to select CLOCK . A new screen will appear that displays the time on the left side of the screen and the date on the right. The time is in 24 hour format, i[...]

89 Chapter 15 Advanced Settings 4. Proceed to setting the date, if required. 5. Alternately, press the Esc key to return to the First Menu Screen . Press Esc again to return to the measurements screen. To set the date... 1. Press F3 ( SET ). The display will change to show six underscore lines where the new date must be entered. 2. Enter the new da[...]

90 Operating the Meter correct for the temperature differential. The amount of error that can occur when the meter and probe are operating at different temperatures depends on the particular probe design as well as the temperature differential. The maximum error that can occur is about 1% per degree Centigrade for diode probes and about 0.1% per de[...]

91 Chapter 15 Advanced Settings 7. Once the correct probe temperature is displayed on the screen, press F4 ( SAVE ). The meter will automatically return to the measurements screen. 8. Alternately, press F1 ( AUTO ) to return to the default auto correct mode. Clearing the Memory If you determine that there is insufficient memory available to perform[...]

92 Operating the Meter Function Key Position The position of the commands for the function keys ( F1 - F4 ), as described in this guide, is for right-hand operation. Conventionally, right-handed people hold the probe in their right hand and the meter in their left hand. The choice of function key location for the START and LOG commands is particula[...]

93 Chapter 15 Advanced Settings 3. Press F1 ( OK ) to continue with the same setting without change. The meter will return to the First Menu Screen . Press Esc to return to the measurements screen. 4. Press F4 ( LEFT )o r F4 ( RGT ) to change to the alternate setting for function key menu position. The meter will return to the first menu screen. Pr[...]

94 Operating the Meter 4. Press F4 ( SET ) to change the display contrast setting. The screen will change to show both the current setting and display an underscore where the new setting is entered. 5. Use the numeric keypad to enter a single digit from 0 - 9 with 0 for the lightest setting and 9 the darkest setting. The contrast will change as soo[...]

95 Chapter 16 Operation with a Fiber Optic Link 16 Operation with a Fiber Optic Link Description Narda fiber optic link transmitters are compatible with all 8700 series probes and the Model 8718B meter. The meter has a built-in fiber optic receiver compatible with the HP Versatile Link type plastic cables and connectors. The fiber optic transmitter[...]

96 Operating the Meter The fiber optic link system also allows the meter and probe to be separated by up to 50 meters. One application is surveying towers. A skilled climber carries the probe while the person actually making the measurements remains on the ground. Controls and Indicators The fiber optic transmitter has the following controls and in[...]

97 Chapter 16 Operation with a Fiber Optic Link To set the meter to use the fiber optic receiver input... 1. Access the menu system by pressing the function key that corresponds to the legend below MENU on the bottom line of the display. 2. Press 8 ( NEXT ) to select the Second Menu Screen . 3. Press 3 to select CABLE/FO . A new screen will appear [...]

98 Operating the Meter 8. Press F4 ( CABLE ) to change to the cable input. The meter will return to the First Menu Screen . Press Esc to return to the measurements screen. System Checks To insure that the entire system – meter, fiber optic transmitter, and probe – are functioning properly... 1. Set the 8718B to use the fiber optic receiver inpu[...]

99 Chapter 17 Operation with a Data Recorder 17 Operation with a Data Recorder Description The Model 8718B provides an output signal that can be connected to a data recorder to provide a continuous record of measurement over an extended period of time. The recorder output is available via the smaller of the two jacks located on the left side of the[...]

100 Operating the Meter Field Strength Recorder Voltage Bar Graph 0.01 mW/cm 2 0.03 volts 1 % of Full Scale 0.50 mW/cm 2 1.50 volts Half Scale 1.00 mW/cm 2 3.00 volts Full Scale 1.01 mW/cm 2 0.03 volts 1% of Full Scale 5.0 mW/cm 2 1.50 volts Half Scale 10.0 mW/cm 2 3.00 volts Full Scale 10.1 mW/cm 2 0.03 volts 1% of Full Scale 50 mW/cm 2 1.50 volts[...]

101 Chapter 18 User's Software 18 User’s Software Description The 8718B User’s Software is a Windows™ - based program that performs three basic functions: • Probe Calibration Data. The User's Software is used to enter probe calibration information into the memory of the Model 8718B. • Data Retrieval. The User’s Software is use[...]

102 Operating the Meter Installing the User’s Software To set up the program... 1. Turn on the computer and start Microsoft Windows (type WIN ) at the DOS prompt if your computer doesn’t start Windows automatically). 2. Insert the User’s Software into your CD-ROM drive. The CD starts automatically and the 8718B-menu screen appears. 3. Follow [...]

103 Chapter 18 User's Software Main Menu Screen[...]

104 Operating the Meter To establish communications between the meter and the computer... 1. Use the supplied computer cable to connect between the RS232 connector on the meter and a COM port ( COM 1 or COM 2 ) of your computer. 2. Start the User’s software. The Main Menu Screen shows the COM port and baud rate settings. Check that the COM port s[...]

105 Chapter 18 User's Software You can have a maximum of six probes installed at any time. Since the serial number of the probe is identified as well as the model number, more than one probe of the same model number may be installed at the same time. To view or change probe calibration data in the meter’s internal memory... 1. Establish comm[...]

106 Operating the Meter Installing a Probe You may have a maximum of six probes installed in the 8718B at any time. If you have six probes installed and want to install another probe, you must first remove a probe. See Removing Installed Probes. To add a probe to the meter’s memory... 1. Click on the N ew Probe button. The Select Below... dialog [...]

107 Chapter 18 User's Software Probe Installation Screen[...]

Operating the Meter 108 7. Enter any special calibration frequencies on the extra lines provided and enter the appropriate calibration factors. Delete any standard calibration frequencies that were not used. 8. Click on the I nstall Probe button. A dialog box will appear asking you if you are sure you want to install the probe. 9. Click on OK . The[...]

109 Chapter 18 User's Software Downloading Logged Data from the Meter To download data from the meter... 1. Establish communications between the meter and your computer described in Establishing Communications.... 2. Select D ownload New Survey from the Survey Data menu. A dialog box will appear that reminds you to make sure that the 8718B is [...]

110 Operating the Meter Three sample files were loaded on your hard drive when installed the User’s Software . There is a sample for each of the three modes of data logging. Selecting a File to View To view stored surveys on your computer... 1. Select V iew Stored Surveys from the S urvey Data menu. A dialog box will appear titled Open Survey Fil[...]

111 Chapter 18 User's Software Logged Survey Data Screen[...]

112 Operating the Meter d) The fourth line shows the Run Ref. Number that was entered by the user at the beginning of the survey, the Record number and total number of records in the file and the Date and Start Time when the first data point was taken. 2. The lower section of the window shows the measured data in both tabular and graphical form. a)[...]

113 Chapter 18 User's Software f) The up and down keys to the right of Increment or Decrement By are used to determine how many records you advance or go back every time you click on the Prev. (previous) Record and Next Record buttons. The small window to the right of the arrows indicates the current setting. To view another survey file... 1. [...]

114 Operating the Meter Exporting Data To export a logged data file for use in a spreadsheet program... 1. Select Make S preadsheet (.csv) File from the Export menu. A dialog box will appear titled Make Spreadsheet (.csv) File. The file selected to be exported drive will be listed in the table on the left. The default directory for exported survey [...]

115 Chapter 18 User's Software Data menu. A dialog box will appear titled Restore Survey Data . It will ask to confirm that you want to clear the survey data from the meter’s memory. 4. Click OK to restore the last survey data to the meter’s memory. To clear the meter’s memory of logged data using the meter’s menu system... 1. Select 2[...]

116 Operating the Meter To update the meter’s firmware … 1. Turn your meter on. Observe the firmware version number, which is displayed briefly about three seconds after you turn the meter on. The meter can be updated if the firmware version is 3.0 or higher. Stop if the firmware version is lower than 3.0 – these meters cannot be updated in t[...]

117 Appendix A Communications with a Computer A Communications with a Computer Application The Model 8718B can be connected to a computer for real time transmission of data via the meter’s RS232 connector. A limited number of the meter’s functions can also be controlled remotely via the RS232 bus. Checksum and Modulo Description Modulo 256 is t[...]

118 Appendices >A000CSCR >C000CSCR >Dr00CSCR >E003XXXCSCR >F0r4XXXXCSCR >H000CSCR >P000CSCR >L000CSCR >V000CSCR >X000CSCR AUTO ZERO READ CLOCK (TIME DATE) Display averaging change r=1, 2, 3, 4 low to high display averaging SET CF (Correction Factor) SET FREQ X is DATA, r is kHz, MHz, GHz r=0=kHz, r=1=MHz, r=2=GHz SEND [...]

119 Appendix A Communications with a Computer >A000CSCR >A000D1CR 3E 41 30 30 30 44 31 0D >C000CSCR >C000D3CR 3E 43 30 30 30 44 33 0D S= seconds in BCD format M= minutes in BCD format H= hours in BCD format X= N/A D= day of month in BCD format N= month in BCD format Y= year (00-99) in BCD format CS= two byte checksum CR= carriage return[...]

120 Appendices Read Max ASCII Hex Reset Max ASCII Hex Display Averaging ASCII Hex Read Calibrated Probe Data ASCII Hex Read Log Data ASCII Hex Read Header (setup data ) ASCII Hex >X000CSCR >X000E8CR 3E 58 30 30 30 45 38 0D >Y000CSCR >Y000E9CR 3E 59 30 30 30 45 39 0D >Dr00CSCR r=l for minimum to 4 for maximum display averaging Example[...]

121 Appendix B Theory of Operation B Theory of Operation Overall Functional Description The meter is a portable, battery-operated instrument that forms a complete RF Radiation Survey System when used with an interconnected Narda 8700 Series probe. Optionally, the system may employ a fiber optic transmitter and cable between the probe and meter. The[...]

122 Appendices The meter also contains built-in self-testing facilities for checking the condition of the batteries, the operation of the probe and for zero adjustment of the probe. The meter provides a means for automatically zero adjusting the meter and probe. When in an operating mode and the probe is in a zero field, the operator presses the Au[...]

123 Appendix B Theory of Operation M o d e l 8 7 1 8 B F u n c t i o n a l B l o c k D i a g r a m[...]

124 Appendices Calibration is performed using the RS-232 port, a voltage source and a computer. PCB A1 is the primary circuit board within the meter. The majority of the components are surface mount. It is located in a heavily shielded area beneath the keypad. Operating power from battery B1 is routed through Q3 and Q4 that form a momentary switch [...]

125 Appendix B Theory of Operation The LCD is a self-contained display and meter circuit assembly. The display has four lines with twenty characters per line. Each character is a 5 x 7 dot matrix. The display is backlit for improved visibility under low light conditions. It connects directly to PCB A1. The keypad has 22 keys. It is shielded in alum[...]

126 Appendices The 872xD series probes operate from 300 MHz to >50 GHz. They contain resistive thermocouples distributed along the length of the dipole. The spacing prevents resonance over the operating frequency range of the probes. The dipole may be viewed as a group of series connected small resistive dipoles or as a very low Q resonant circu[...]

127 Appendix B Theory of Operation This provides for the independence of probe orientation relative to the polarization of the field. The instantaneous charge distribution on adjacent cold junction elements produces a potential difference across the thin-film resistive thermocouples and a resultant dissipation of energy in these films. As the frequ[...]

128 Appendices[...]

129 Appendix C Maintenance General The Model 8718B requires very little maintenance. No operator adjustments are required. The electronic circuitry is contained in a very rugged aluminum housing. However, this housing is not watertight and should not be immersed in water. The LCD display and the case may be cleaned using a damp cloth. Do not use an[...]

130 Appendices Description Model or Part Number Comments Battery Charger, 115 volt 84156000 Battery Charger, 230 volt 84156001 Power Cord 89707000 to 89707008 Supplied with 230 volt charger only, see table for outline Storage Case 32542703 Probe Extension Cable 87744-04 Electric Field Attenuator 8713B Computer Cable 87239000 User's Software 99[...]

131 Appendix C Maintenance Rechargeable Battery Management Program The Model 8718B contains a rechargeable nickel-cadmium battery that must be recycled or disposed of in compliance with applicable federal, state, or local environmental regulations. Narda maintains a rechargeable battery management program in keeping with its highly proactive policy[...]

132 Appendices[...]

133 Index Audio Alarm Alarm Description 4, 67 Controlling Alarm Function 67 Fixed Alarm 68 Variable Tone Alarm 69 Back Light 75 Bar Graph 23 Battery Accuracy of Battery Status Indicator 77 Battery Capacity 76 Charger, description 3, 130 Charger, line cord options 3, 13 1 Checking Battery Status 76 Rechargeable Management Program 131 Clock 88 Commun[...]

134 Index Probe Test Sources 4 Testing the Probe 23 Probe Zero Causes of Zero Drift 82 Checking for Zero Drift 82 Establishing a Zero Field 83 Shielding the Probe 84 Temperature Concerns 83 Understanding the Zero Function 81 Zeroing the Probe, in use 85 Zeroing the Probe, initial 17 Spatially-Averaged Measurements Spatial Averaging with the 8718B 4[...]

Narda Safety Test Solutions (Narda STS) warrants each product of its manufacture to be free from any defect in material and workmanship for a period of one year from date of shipment to, and return by, the original purchaser. All warranty returns, however, must first be authorized by a factory office representative. The limit of liability under thi[...]

USA: 435 Moreland Road Hauppauge, NY 1 1788 Te l 1-631 231-1700 Fax 1-631 231-171 1 E-Mail NardaSTS@L-3COM.com www .narda-sts.com GERMANY : Sandwiesenstrasse 7 D-72793 Pfullingen Te l +49-7121-9732-777 Fax +49-7121-9732-790 E-Mail support@narda-sts.de www .narda-sts.de[...]