Fluke 189 manuale d’uso

® Model 187 & 189 True RMS M ultimeter Users Manual August 2000, Rev.2, 6/02 © 2000, 2002 Fluke Corporation. All rights reserved. Printed in U.S.A . All product names are trademarks of their respective companies.[...]

Lifetime Li mi ted Warranty Each Fluke 20, 70, 80, 170 and 180 Series DMM will be f ree from defect s in material and work mans hip f or its lif et ime. As us ed herein, “lifet i m e” i s defined as s ev en years af ter Fluk e di s continues manufac t uring the produc t , but t he warrant y period s hal l be at l eas t ten y ears from the date [...]

i Table of Contents Chapter Title Page 1 Before You Start .......................................................................................................... 1-1 Safety Information.......................................................................................................... 1-1 Contacting Fluke ...................................[...]

Model 187 & 189 Users M anual ii Selecting the Range ....................................................................................................... 2-10 Understanding the Display ............................................................................................. 2-10 Primary Display ...........................................[...]

Contents (continued) iii Measuring AC Current .............................................................................................. 3-18 Measuring DC Current .............................................................................................. 3-20 Measuring Frequency ...............................................................[...]

Model 187 & 189 Users M anual iv 6 Maintenance ................................................................................................................. 6- 1 Introduction ................................................................................................................... .6 - 1 General Maintenance ........................[...]

v List of Tables Table Title Page 1-1. Safety Information......................................................................................................... ........ 1-2 1-2. International Electrical Sym bols ........................................................................................... .1 - 4 2-1. Rotary Switch Selections ......[...]

Model 187 & 189 Users M anual vi[...]

vii List of Figures Figure Title P age 2-1. AC Volts Dis play ................................................................................................................... 2-2 2-2. Rotary Switch ........................................................................................................................ 2-4 2-3. Pushbuttons .......[...]

Model 187 & 189 Users M anual viii 3-10. Temperature Measurem ent ................................................................................................... 3-15 3-11. AC Current Measurement.................................................................................................... .. 3-19 3-12. DC Current Measurement .........[...]

1-1 Chapter 1 Before You Start Safety Informa tion The Fluke Model 187 and M odel 189 True RMS Multimeters (hereafter referred to as the “ meter ” ) comply with: • EN61010.1:1993 • ANSI/ISA S82.01-1994 • CAN/CSA C22.2 No. 1010.1-92 • 1000V Overvoltage Category III, Pollution Degree 2 • 600V Overvoltage C ategory IV, Pollution Degree 2[...]

Model 187 & 189 Users M anual 1-2 Table 1-1. Safety Information W Warning To avoid possible electric shock or personal injury, follow these guidelines: • Do not use the meter if it is damaged. Before you use the meter , inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.[...]

Before You Start Safety Information 1 1-3 Table 1-1. Safety Information (cont.) W Warning • When using the probes, keep your fingers behind the finger guar ds on the probes. • Connect the common test lead before you connect the live test lead. When you disconnect test leads, disconnect the live test lead first. • Remove test leads from the me[...]

Model 187 & 189 Users M anual 1-4 Symbols Symbols used on the meter and in this manual are explained in Table 1-2. Table 1-2. International Electrical Symbols AC (Alternating Current) Earth ground DC (Direct Current) Fuse AC and DC Double insulated Battery Important information Complies w ith relevant Canadian Standards Ass ociation directives [...]

2-1 Chapter 2 Getting Acquainted Introduction Although this manual des cribes the operation of both Models 187 and 189, all illus trations and exam ples assum e use of Model 189. Additional c apabilities with Model 189 are disc ussed in Chapter 4. Thes e capabilities include the following: • An enhanced memory function that features an additional[...]

Model 187 & 189 Users M anual 2-2 tc031f. eps Figure 2-1. AC Volts Display Battery Considerations The meter uses four AA alkaline batteries. The following paragraphs desc ribe several tec hniques used to c onserve battery power. Automatic Powe r Off The display blank s and the meter goes into a “ sleep ” mode if you hav e not changed the ro[...]

Getting Acquainted Battery Considerations 2 2-3 Automatic Backligh t Off Press T to select the back light level (low, high, or off.) In low or high, the backlight turns off automatically after a given period. This period is also preset to 15 m inutes and can be set to a m aximum of 99 m inutes from the s etup menu. If the period is s et to 0, the b[...]

Model 187 & 189 Users M anual 2-4 Rotary Switch Turn the meter on by s electing any m easurement function (identified with white letters around the rotary s witch). The meter presents a standard display for that func tion (range, measurem ent units, modifiers, etc.) The display may also be influenced by s ome of the choic es made in Setup. Use [...]

Getting Acquainted Pushbuttons 2 2-5 Pushbuttons The buttons activ ate features that augment the func tion selected with the rotary switc h. The buttons are shown in Figure 2-3 and described in Table 2-2. Use the blue button ( % ) to acc ess func tions labeled in blue for some of the rotary s witch pos itions. Table 2-1 defines all blue button func[...]

Model 187 & 189 Users M anual 2-6 Table 2-1. Rotary Switch Selections Position Rotary Switch Function % Blue Key Function AC voltage meas urement from 0 V to 1000.0 V dB over AC, AC over dB , AC millivolt m easurement from 0 mV to 3000.0 mV dB over AC, AC ov er dB $ DC voltage m easurement from 0 V to 1000.0 V AC over DC (AC in primary dis pl[...]

Getting Acquainted Pushbuttons 2 2-7 Table 2-1. Rotary Switch Positions (cont.) Position Rotary Switch Function % Blue Key Function I AC current meas urements from 0 mA to 20.000 A none = AC current meas urements from 0 µ A to 5000.0 µ A none K DC current m easurements from 0 mA to 20.000 A AC over DC (AC in prim ary display , DC in sec ondary di[...]

Model 187 & 189 Users M anual 2-8 Table 2-2. Pushbuttons Button Description Yellow Button Function Description Note Press O to access “Yellow Button Functions .” The O box and the 24-hour clock appear in the lower corners of the display and the prim ary display freezes, allowing tim e to press a s econd button. T l Press to turn bac klight [...]

Getting Acquainted Pushbuttons 2 2-9 Table 2-2. Pushbuttons (cont.) Button Description Yellow Button Function Description [ • In Setup, increment a digit . • In counter functions , select pos itive pulse s lope. • In ohms c ontinuity, selec t beep on open. • In VIEW MEM, s ee Chapter 4 (Model 189). (none) ] • In Setup, decrement a digit .[...]

Model 187 & 189 Users M anual 2-10 Selecting the Range Press R to select either a fixed range or the autorange feature. Note You cannot use R in c onductance, diode test, and temperature func tions or with the REL, MIN MAX, and FAST M N MX features. Thes e selections all use a spec ific fixed range. Autoranging (AUTO lighted in the display ) al[...]

Getting Acquainted Understanding the Dis play 2 2-11 • dB (in ac volts func tions): the dBm or dBV v alue. • REL: the difference between the pres ent reading and a stored reference reading. • Setup: various mes sages (s ee Chapter 5). • Overload c onditions: OL display ed. • Error conditions. Secondary Dis pla y The secondary display ofte[...]

Model 187 & 189 Users M anual 2-12 14 16 15 17 8 9 10 11 7 13 5 6 2 4 3 1 12 tc011f. eps Figure 2-4. Display Features[...]

Getting Acquainted Understanding the Dis play 2 2-13 Table 2-3. Display Features Number Feature Description  ~ Continuity test func tion is selected.  Bar Graph. In normal operation 0 (zero) is on the left. In Relative %, 0 is in the center, negativ e values are to the left and pos itive to the right. The polarity indicator left of the bar gr[...]

Model 187 & 189 Users M anual 2-14 Table 2-3. Display Features (cont.) Number Feature Description  FAST MIN MAX AVG FAST MN MX m ode is enabled. ( O M ) Minimum reading displayed. Maxim um reading display ed. Average reading display ed.  ; Readings are being recorded in m emory (M odel 189 only.) ( O + D )  g The meter is in Hold m ode[...]

Getting Acquainted Understanding the Dis play 2 2-15 Table 2-3. Display Features (cont.) Number Feature Description  AC+DC For dc volts and dc amps functions, reading represents the rms total of ac and dc measurem ents. e , k e M e , Ω : Ohm. The unit of res istance. k Ω : Kilohm. 1 x 10 3 or 1000 ohm s. M Ω : Megohm. 1 x 10 6 or 1,000,000[...]

Model 187 & 189 Users M anual 2-16 Table 2-3. Display Features (cont.) Number Feature Description  51000 AUTO MANUAL Range. Digits dis play range in use.  f MS 88:88 Time Display. Used with HOLD, AutoHOLD, M IN MAX, FAST MN M X (SAVE, and LOGGING Model 189). Elapsed Time Dis play ( f on): show n in minutes:s econds to max imum of 59:59 - [...]

Getting Acquainted Using the Input Terminals 2 2-17 Using the Input Terminals All functions ex cept current us e the * and COM inputs. Current func tions use the inputs shown below: • I or K function: Us e A and COM inputs from 400 mA to 20 A. Use m A/ µ A and COM for inputs ≤ 400 mA. • = or x function: Us e mA/ µ A and COM for inputs ≤ 5[...]

Model 187 & 189 Users M anual 2-18 Using Display Hold Press Q to enter the Display Hold m ode and freeze the present reading and its tim e stamp. New readings now appear in the secondary display. See Figure 2-6. To ex it Display H old mode, press Q again. Note The bar graph and secondary display m ay show different units in Capacitanc e and Ohm[...]

Getting Acquainted Using AutoHO LD 2 2-19 Using AutoHOLD W Warning AutoHOLD mode does not capture unstable or noisy readings. Do not use AutoHOLD mode to determine that circuits are without power. To enter AutoHOLD, press OQ (AutoHOLD). AutoHOLD m ode freezes the present reading and its time stamp. New readings now appear in the sec ondary display.[...]

Model 187 & 189 Users M anual 2-20 To exit MIN M AX mode, press O N (CANCEL) or turn the rotary switc h to a different position. Also, M IN MAX mode turns off automatically when a flashing B (low battery condition) oc curs. Note Minimum, maximum , and average values stored in the MIN MAX m ode are lost when the m eter is turned off. The MIN MAX[...]

Getting Acquainted Using F AST MN MX 2 2-21 Using FAST MN MX FAST MN MX c an capture transient s ignal events as short as 250 µs, but with dec reased acc uracy; only 3-1/2 display digits are allowed. Activate FAST MN MX by pres sing O M . As with regular MIN MAX, y ou can then press M to cycle through maximum , minimum , and average primary displa[...]

Model 187 & 189 Users M anual 2-22 Using HOLD with MIN MAX or FAS T MN MX You can enable the HOLD mode when in the MIN MAX mode is by pressing Q . No further minimum , maximum , or average updates oc cur while the HOLD m ode is enabled. Exit HOLD mode by press ing Q a second tim e. Using Relative Mode (REL) Selecting Relativ e mode ( D ) caus e[...]

3-1 Chapter 3 Making Measurements Introduction Chapter 3 explains how to make m easurements . Most measurem ent functions c an be selected by using the rotary switc h. White letters or sy mbols identify primary func tions; blue letters or sy mbols identify alternativ e functions. Press the blue button to acces s these alternate func tions. Frequenc[...]

Model 187 & 189 Users M anual 3-2 When measuring v oltage, the meter acts like a 10 M Ω (10,000,000 Ω ) impedance in parallel with the c ircuit. This loading effect can c ause meas urement errors in high- impedance c ircuits. In mos t cases , the error is negligible (0.1% or less) if the c ircuit impedanc e is 10 k Ω (10,000 Ω ) or l e [...]

Making Measurements Measuring Voltage 3 3-3 dB Measurements in AC Volts Functions The two ac volts functions allow you to display readings as deviations in dB (dec ibels) above or below an established level. Set up dB measurem ents with the following procedure: 1. Make an ac volts meas urement to be used as a reference point. 2. Press % to select d[...]

Model 187 & 189 Users M anual 3-4 dB is calc ulated with the following formula:       = Vr Vx dB 10 log * 20 • For dBm, Vr is the v oltage across the referenc e resistanc e at 1 mW. For example, Vr w ould be 0.7746 V with a 600 Ω reference resis tance. • For dBV, the reference voltage (Vr) is 1 V. Measuring DC Volt age S[...]

Making Measurements Measuring Voltage 3 3-5 AC over DC DC over AC AC + DC tc024f. eps Figure 3-3. AC and DC D isplay When the meter shows ac over dc or dc over ac , the following other pushbutton functions are not available: • AutoHOLD ( O Q ) • MIN MAX ( M ) • FAST MN MX ( O M ) • Hz ( N ) • Relative ( D ) • LOGGING ( O D )[...]

Model 187 & 189 Users M anual 3-6 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400mA FUSED[...]

Making Measurements Measuring Res istanc e 3 3-7 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V [...]

Model 187 & 189 Users M anual 3-8 Keep the following in mind when m easuring resis tance: • Because the m eter ’ s test current flows through all possible paths between the probe tips, the meas ured value of a resistor in a c ircuit is often different from the resistor ’ s rated value. • The test leads c an add 0.1 Ω to 0.2 Ω of err[...]

Making Measurements Using Conduc tance for High Res istance Tes ts 3 3-9 Continuity testing prov ides you with both a visual indication of the state enc ountered (usually near 0 resistanc e for a short or OL for an open) and an audible beep when the input is low. In continuity, a s hort means a m easured value les s than 5% of full scale. You c an [...]

Model 187 & 189 Users M anual 3-10 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400mA FUSE[...]

Making Measurements Using Conduc tance for High Res istance Tes ts 3 3-11 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST [...]

Model 187 & 189 Users M anual 3-12 Measuring Capacitance Caution To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the dc voltage function to confirm that the capacitor is discharged. Capacitance is the ability of a com ponen[...]

Making Measurements Testing Diodes 3 3-13 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400mA F[...]

Model 187 & 189 Users M anual 3-14 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400mA FUSE[...]

Making Measurements Measuring Tem perature 3 3-15 Measuring Temperature To measure tem perature, set up the meter as s hown in Figure 3-10. The meter begins tem perature measurement in the degree units last us ed (Celsius ° C or Fahrenheit ° F). Once you hav e selected the temperature function, you c an change units by pressing the blue button. T[...]

Model 187 & 189 Users M anual 3-16 Measuring Current W Warning Never attempt an in-circuit current measurement where the open-circuit potential to earth is greater than 1000 V. You may damage the meter or be injured if the fuse blows during such a measurement. Caution To avoid possible damage to the meter or to the equipment under test, check t[...]

Making Measurements Measuring Current 3 3-17 3. If you are using the A term inal, set the rotary sw itch to mA/A. If you are us ing the mA/ µ A terminal, s et the rotary switc h to µ A for currents below 5000 µ A (5 mA), or mA/A for c urrents above 5000 µ A. 4. Open the circuit path to be tes ted. Touch the red probe to the more positiv e side [...]

Model 187 & 189 Users M anual 3-18 The following are some tips for measuring c urrent: • If the display s hows LEAd5 and you are s ure the meter is set up c orrectly, tes t the meter ’ s fu ses as described under "Tes ting the Fuses" in Chapter 6. • A current meter drops a s mall voltage ac ross its elf, which might affec t circ[...]

Making Measurements Measuring Current 3 3-19 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400m[...]

Model 187 & 189 Users M anual 3-20 Measuring DC Current To measure dc current, set up the meter as shown in Figure 3-12. You can view s eparate dc and ac am ps signal components . • Press % once to display ac current in the primary display and dc current in the sec ondary display (ac over dc). • Press % a second tim e to reverse the display[...]

Making Measurements Measuring Current 3 3-21 MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A MIN MAX HOLD REL % ms Hz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COM V TEMPERATURE A AutoHOLD LOGGING SAVE CANCEL FAST MN MX SETUP YES NO 1000V 400m[...]

Model 187 & 189 Users M anual 3-22 Measuring Frequency Frequency is the number of cycles a si gnal completes each sec ond. The meter measures the frequency of a voltage or current s ignal by counting the number of tim es the signal cros ses a thres hold level each s econd. Figure 3-13 highlights the function s elections that allow frequency m e[...]

Making Measurements Measuring Duty Cyc le 3 3-23 tc026f. eps Figure 3-14. Hz Display The meter beeps to indic ate when a particular pushbutton is not allowed when m easuring frequency . The following are some general rules. • Relative ( D ), Hold ( Q ), and MIN MAX ( M )can be used. • FAST MN MX ( O M ) cannot be used. The following are some ti[...]

Model 187 & 189 Users M anual 3-24 -Slope Trigger Point +Slope Trigger Point 30% Above Trigger Point 100% -Slope Trigger Point +Slope Trigger Point 70% Below Trigger Point 100% Measures Positive Pulse Measures Negative Pulse tc009f. eps Figure 3-15. Duty Cycle Measur ements[...]

Making Measurements Measuring Puls e Width 3 3-25 To me asur e dut y cycle , set u p th e met er t o mea su re frequency; then pres s N a sec ond time. You can select the lev el the meter uses by press ing [ to trigger on the positive s lope or ] to trigger on the negative slope. A ty pical duty cycle di spla y is sho wn i n Figure 3-16. tc027f. ep[...]

Model 187 & 189 Users M anual 3-26 +Slope Trigger Point Pulse Width Period = Period -Slope Trigger Point Pulse Width Start and Stop on Positive Slope Start and Stop on Negative Slope 1 Frequency tc020f. eps Figure 3-17. Pulse Width Measurements[...]

Making Measurements Measuring Puls e Width 3 3-27 The meter meas ures pulse width in the 500.00 or 1000.0 ms ranges . To measure puls e width, set up the meter to meas ure frequency; then pres s N two more times . As with the dut y cycl e fu ncti on, you ca n sel ect wh ich l evel the mete r uses by pressing [ to trigger on the pos itive slope or ][...]

Model 187 & 189 Users M anual 3-28[...]

4-1 Chapter 4 Using Memory & Communications Features Introduction Chapter 4 shows you how to use m emory and comm unication features av ailable on the meters. Note Memory, Logging, and Sav e features apply to the 189 only. Types of Memory The meter has two ty pes of memory data: saved readings and logged readings . Saved Readings Memory Saved r[...]

Model 187 & 189 Users M anual 4-2 Storing Saved Readings To add the current display ed reading to the saved readings memory , press O R (SAVE). • 5AVEd appears briefly to c onfirm the operation and the index number dis play increm ents by one. • FULL appears if no room is available in the sav ed readings memory (after 100 saves ). Saved rea[...]

Using Memory & Communications Features Viewing Memory Data 4 4-3 Viewing Memory Data Use the following proc edure to view mem ory data: Note Viewing memory data involves turning the rotary switch from its current func tion. Selections are not retained when you turn the sw itch. To return the meter to this function after v iewing memory data, no[...]

Model 187 & 189 Users M anual 4-4 2 7 3 4 1 5 6 tc035f. eps Figure 4-1. View Display Table 4-1. View Display No. Item Description  q arrow icons. Denotes use of [ or ] to select higher or lower index numbers.  Z sym bol Hazardous v oltage could be present at inputs.  ; Identifies that the average of a logging interval is dis played. Wh[...]

Using Memory & Communications Features Clearing Memory 4 4-5 Clearing Memory You can clear mem ory in two way s. • First, If the rotary s witch is in the VIEW M EM position, you can pres s the blue button ( % ) to activ ate the CLEAR MEM func tion. CLr.? appears in the dis play. You are then prompted to press [ (YES) to clear the type of memo[...]

Model 187 & 189 Users M anual 4-6[...]

5-1 Chapter 5 Changing the Default Settings Introduction The meter allows y ou to change the default operating configuration of the meter by changing setup options made at the factory . Many of thes e setup options affec t general meter operations and are activ e in all functions. Ot hers are limited to one function or group of func tions. These se[...]

Model 187 & 189 Users M anual 5-2 Table 5-1. Function Specific Setup Selections Selection Precondition Option Choices ( ) Factory Default 000.0 ° C or 000.0 ° F Temperature ( w ) sele cted . Temperature offset adjust 000.0 ° to ± 100.0 ° C ( 180 . 0 ° F ) - Use q to increment or dec rement digit. Use to selec t digit. Selected digit flash[...]

Changing the Default Settings Selecting Setup Options 5 5-3 Table 5-2. Common Setup Selections Selection Option Choices Factory Default bEEP Beeper yE5 or no (flashing) Use to select. yE5 8888 Displ a y dig its 8888 (4) or 88888 (5) Use to select. 88888 bLoFF Backlight time out MM:SS - Us e q to increment or dec rement minute or second v alues. Use[...]

Model 187 & 189 Users M anual 5-4 Select and edit setup options as follows: • Turn the rotary switc h to a measurem ent function: • Press O T to advance to the next setup option and save the pres ent selection. • Press [ to increase or ] to decrease a v alue. • Press T ( l ) to go back to the previous digit or sele ctio n. • Press % ([...]

Changing the Default Settings Adjusting the Temperature O ffset 5 5-5 If necess ary, adjust the temperature offs et until the temperature on the primary display matc hes the temperature indicated by the lag bath thermometer. 1. Press % ( s ) to advance to the nex t digit and press T ( l ) to go back to the prev ious digit. 2. Press [ or ] to increa[...]

Model 187 & 189 Users M anual 5-6 Selecting Display Resolution (3 1/2 or 4 1/2 Digits) For most func tions, you c an choose whether the m eter displays the reading in 3-1/2 or 4-1/2 digits. • The 3-1/2 digit setting provides lower resolution with faster respons e time. • The 4-1/2 digit setting provides greater resolution with slower respon[...]

Changing the Default Settings Setting the 24-Hour Clock 5 5-7 Setting the 24-Hour Clock The meter uses 24-hour clock readings as time s tamps during HOLD, AutoHOLD , MIN MAX, FAST M N MX, SAVE, and LOGGING operations. Hours and minutes to a maxim um of 23:59 can be s et. Note The meter uses elapsed time for all MI N MAX readings. Elapsed tim e is e[...]

Model 187 & 189 Users M anual 5-8 Returning to Factory Defaults Your meter comes with the setup options pres et at the factory. Thes e factory s ettings are shown in Tables 5-1 and 5-2. You can always return to these settings as follows: 1. Press O T until Fcty appears in the display . 2. Press % to select yE5 ; press T to select no . If yo u s[...]

6-1 Chapter 6 Maintenance Introduction This chapter des cribes bas ic operator maintenanc e. For calibration and performanc e test information, order the 187 & 189 Service M anual , PN 1584337. General Maintenance Periodically wipe the c ase with a dam p cloth and mild detergent. Do not use abrasiv es or solv ents. Dirt or moisture in the term [...]

Model 187 & 189 Users M anual 6-2 1 0 0 0 V 400m A FU S ED 10A M A X FU S ED C A T M IN M A X H O L D R E L % m s H z R A N G E d B d B a c + d c a c + d c a c + d c a c + d c F n S mA mA A mV V mV V O F F C A A A A m A C O M V TEMPERATURE A a c + d c AutoHOLD LOGGING SAVE CANCEL FAST MN MX YES NO C L E A R M E M V IE W SETUP 1 0 0 0 V 400m A F[...]

Maintenance Replacing the Batteries 6 6-3 Replacing the Batt eries Replace the batteries with four AA batteries (NEDA I5A or IEC LR6). W Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery indicator ( B ) appears. Replace the batteries as follows (refer to Fig[...]

Model 187 & 189 Users M anual 6-4 F2 F1 tc037f. eps Figure 6-2. Battery and Fuse Replacement[...]

Maintenance Replacing the Fuses 6 6-5 Replacing the Fuses W Warning To avoid electrical shock or damage to the meter, only use replacement fuses specified in Table 6-1. Referring to Figure 6-2, examine or replac e the meter ’ s fuses as follows : 1. Turn the rotary switc h to OFF and remove the tes t leads from the term inals. 2. Remo ve th e ba [...]

Model 187 & 189 Users M anual 6-6 Table 6-1. User-Replaceable Parts Description Reference Designators Part Number Qty Access Door, Battery / Fus e MP14 666446 1 Tilt-Stand MP8 659026 1 Acces sory Mount MP9 658424 1 W Fuse, 0.44 A (44/100 A, 440 mA), 1000 V, FAST F1 943121 1 W Fuse, 11 A,1000 V FAST F2 803293 1 Battery, 1.5 V, 0-15 mA, AA Alk al[...]

7-1 Chapter 7 Specifications Safety a nd Compliances Maximum volt age bet ween any ter m i nal and eart h ground. 1000 V dc or r ms ac Compliances - DUAL RATI NGS Complies wit h IEC 1010-1 t o 1000 V Overvolt age Cat egory III, Pollut i on Degree 2; and I EC 664-1 t o 600 V Over volt age Cat egory IV, Pol luti on Degr ee 2 * Certi f icati ons (Ii s[...]

Model 187 & 189 Users M anual 7-2 Physical Specifications Display (LCD) Digital: 50000/5000 counts prim ary dis play, 5000 counts s econdary dis play; updates 4/sec ond. Analog: 51 segments , updates 40/sec ond. Operating Temperature − 20 ° C to + 55 ° C Storage Temperature − 40 ° C to + 60 ° C Temperature Coefficient 0.05 x (spec ified[...]

Specifications Feature Summary 7 7-3 Feature Summary Feature Description Dual Digital Displays Analog Bar Graph Primary: 50,000 counts Secondary: 5,000 count Bar graph: 51 segments , updates 40 times /second Backlight with 2 brightness levels Bright white backlight for c lear readings in poorly lighted areas Fast Autorange Meter automatically s ele[...]

Model 187 & 189 Users M anual 7-4 Basic Specifications Function Ranges/Description DC Voltage 0 to 1000 V AC Voltage, true RMS 2.5 mV to 1000 V – 100 k Hz bandwidth Basic Accuracy DC voltage: 0.025 % AC voltage: 0.4 % DC Current 0 to 10 A (20 A for 30 seconds) AC Current, true RMS 25 µ A to 10 A (20 A for 30 s econds) Resistance 0 to 500 M ?[...]

Specifications Detailed Accurac y Specific ations 7 7-5 Detailed Accuracy Specifications Accurac y is spec ified for a period of one year after calibration, at 18 ° C to 28 ° C (64 ° F to 82 ° F), with relativ e humidity to 90 %. Accurac y spec ifications are giv en as: ± ( [ % of reading ] + [ number of least s ignificant digits ] ) AC mV, AC[...]

Model 187 & 189 Users M anual 7-6 Accuracy Function Range Resolution 45-1 kHz 20-45 Hz 1-20 kHz 20 kHz-100 kHz AC µ A 500.00 µ A 0.01 µ A 0.75 % + 20 1 % + 20 0.75 % + 20 6 % + 40 5,000.0 µ A0 . 1 µ A 0.75 % + 5 1% + 5 0.75 % + 10 2 % + 40 AC mA 50.000 mA 0.001 mA 0.75 % + 20 1% + 20 0.75 % + 20 9 % + 40 400.00 mA 0.01 mA 0.75 % + 5 1% + 5[...]

Specifications Detailed Accurac y Specific ations 7 7-7 Accuracy Accuracy Dual Display A C or AC+DC 3 Function Range Resolution DC 20 - 45 Hz 45 Hz - 1 kHz 1 kHz- 20 kHz DC mV 50.000 mV 0.001 mV 0.1% + 20 6 % + 40 500.00 mV 0.01 mV 0.03 % + 2 3000.0 mV 0.1 mV 0.025 % + 5 2 % + 40 DC V 5.0000 V 0.0001 V 0.025 % + 10 2 50.000 V 0.001 V 0.03 % + 3 2 5[...]

Model 187 & 189 Users M anual 7-8 Function Range Resolution Accuracy Resist ance 1 500.00 Ω 0.01 Ω 0.05 % + 10 3 5.0000 k Ω 0.0001 k Ω 0.05 % + 2 50.000 k Ω 0.001 k Ω 0.05 % + 2 500.00 k Ω 0.01 k Ω 0.05 % + 2 5.0000 M Ω 0.0001 M Ω 0.15 % + 4 2 5.000 M Ω up to 32.000 M Ω 0.001 M Ω 1.0 % + 4 2 32.0 M Ω up to 50.0 M Ω[...]

Specifications Detailed Accurac y Specific ations 7 7-9 Function Ranges Resolution Accuracy Capacitance 2 1.000 nF 0.001 nF 2% + 5 10.00 nF 0.01 nF 1 % + 5 100.0 nF 0.1 nF 1.000 µF 0.001 µF 10.00 µF 0.01 µF 100.0 µF 0.1 µF 1,000 µF 1 µF 10.0 mF 0.01 mF 50.00 mF 0.01 mF 3 3 % + 10 Diode Test 1 3.1000 V 0.0001 V 2 % + 20 1. For the 5,000 c ou[...]

Model 187 & 189 Users M anual 7-10 Function Range Resolution Accuracy Frequency 500.00 Hz 0.01 Hz 1 ± (0.0050 % + 1) 5.0000 kHz 0.0001 k Hz 50.000 kHz 0.001 k Hz 999.99 kHz 0.01 k Hz Duty Cy cle 10.00% to 90.00 % 0.01 % ± ((voltage range/input voltage) X 300 c ounts) 5,6 Pulse Width 499.99 ms 0.01 ms ± (3 % X (voltage range/input v oltage) +[...]

Specifications Frequency Counter Sens itivity 7 7-11 Frequency Counter Sensitivity Approximate VAC Sensitivity (RMS Sine Wave) 1 Input Range 15 Hz to 100 kHz 2 500 kHz 2 VAC Bandwidth 3 Approximate VDC Trigger Levels 1 VDC Bandwidth 3 50 mV 5 mV 10 mV 1 MHz -5 mV & 5 mV 1 M Hz 500 mV 20 m V 20 mV 1 MHz 5 mV & 65 mV 1 MHz 3000 mV 500 mV 2000[...]

Model 187 & 189 Users M anual 7-12 Input Characteristics Function Input Impedance (Nominal) Volts, mV 10 M Ω , < 100 pF Common Mode Rejection Ratio Normal M ode Rejection DC Volts, m V >100 dB at dc, 50 Hz or 60 Hz ±0.1% >90 dB at 50 Hz or 60 Hz ± 0.1% AC Volts, mV > 90 dB dc to 60 Hz Full-Scale Voltage Open Circuit Test Voltage[...]