HP (Hewlett-Packard) 00974-90002 manuale d’uso

HP 974A Multimet er User’s Guide Part Number 00974-90002 March 1995 © Copyright Hewlett-Packard Company 1994, 1995 All Rights Reserve d[...]

[...]

HP 974A Multimete r Table of Contents S a f e t y S u m m a r y . . . . . . . . . . . . . . . 1 - 4 S a f e t y S y m b o l s . . . . . . . . . . . . . . 1 - 4 Maximu m Overvolt age Limitation s . . . 1-5 P r o b e s a n d T e s t L e a d s . . . . . . . . . 1 - 6 O p e r a t i o n . . . . . . . . . . . . . . . . . . . 1 - 7 Term inal s, Sh ut ter,[...]

Safety Summary The CAU TIONS an d WARNINGS which appe ar o n the follow ing p ages m ust b e fol lowed to ens ure op erat or saf ety and to retai n the opera ting condi tion of the Mult imeter. 1. Do not us e this prod uct beyond its sp ecif icat ions or for uses no t int ended fo r this prod uct as id entified by the pr oduct functio ns, ra nges, [...]

WARNIN G POSS IBLE ELE CTRIC AL SHOC K . Ca libra tion a nd p erfo rmanc e test s ar e to b e pe rform ed b y qualif ied per sonnel only. D o not at tempt c alibrati on or test proc edures unless qual ifie d to do so . CAUTI ON To avoi d damage to the multimeter fo r inputs abov e 250 Vdc or Vac , disconnect th e test leads befo re c hangi ng f unc[...]

Function Maximum Operating Input 10 A ± 10 A (dc or ac rm s) / 600 V mA or µ A ± 500 mA (dc or ac rms ) / 250 V Res istan ce, Dio de T est, Temp erat ure, Con tinuit y 500 V (dc or ac rms) Freque ncy (10 Hz to 9.99 9 kHz) (9 kHz to 2 00 kHz ) 500 Vrms 100 Vrms V ± 1000 V dc or 750 Vrm s Probes and Test Leads 1. Alway s inspect probes be fore us[...]

Operat ion Terminals, Shutter, & Test L eads RED LEAD Current Measurements (0 A to 10 A) RED LEAD Current Measurements (0 to 400 mA) BLACK LEAD COMMON ALL Measurements RED LEAD DC & AC Volta ge, Diode, Resistance, Frequency, Temperature, dBm and Continuity Measurements SAFE TY SHUT TER Slide up to op en shutters for current measurement inpu[...]

Funct ion Switch Switc h Position Display 10A DC Cur rent (1 m A to 10 A) AC C ur rent (1 m A to 10 A) 500 mA DC C urre nt (10 µ A to 0.5 A ) AC C ur ren t (10 µ A to 0.5 A) 50 mA DC C urre nt (1 µ A to 0.05 A) AC Cur re nt (1 µ A to 0.05 A) 500 µ A DC Cur rent (0.0 1 µ A to 0.5 m A) AC C ur ren t (0.0 1 µ A to 0.5 mA) Diod e Test Auto Dio d[...]

Funct ion Keys Power Automat ic power of f after 30 min utes. Alarm so unds 30 se conds be fore autom atic pow er off. Pre ss any key or ch ange any fun cti on to canc el automat ic power of f. Defeat automati c power off by hol ding ke y for 2 seco nds whil e applyi ng power . Relative/Percent Press Action Main Display Secondary Display Make s the[...]

Minimum/Maximum 1 Press Action Main Display Secondary Display 2 Begin rec ording of min, max , and avg 3 values Each meas ured valu e Elap sed tim e Disp lay recorde d maximum Maxi mum mea surem ent Time of Maxim um Displ ay reco rded minim um Mini mum measure ment Time of Min imum Disp lay recor ded averag e Calc ulated av erage Elaps ed time Disp[...]

Hold/Auto-Hold Press Action Main Display Secondary Display Holds the me asurement value in the displa y Measur ement valu e when hold pr essed Rang e Ente rs A uto- Hol d fu nc tion 1 Input value Range Cancel s Hold funct ion Meas ureme nt valu e Range 1 Auto-Hold Operation. When measurement becomes stable, m ultimeter will beep and save the stable[...]

Function Keys and Function Switch Matr ix Function Relative % (Perce nt) Min/Max 3 Avera ge Data Ho ld Auto -Hold Rang e µ A, mA , 10 A • ••••• µ A, mA , 10 A • ••••• •• • • • • Ω • 1 ••••• • • ° F, ° C •• • mV •• • • • V • •••••• •• V • ••••••[...]

Display Audio Powe r on First be ep a t powe r on . Sec ond beep whe n begi nning t o ma ke measur ements. Sing le beep Indica tes any valid func tion key pres s. Ind icate s a new High or Low value re corded whe n in Min/ Max funct ion. Steady r epea ting beep Ind icate s when measur ement is st eady wh en using Au to-H old funct ion. Rapid repea [...]

Calibrat ion and Adjus tment Required Test Equipment The source us ed fo r the ca librati on sho uld have an outpu t accura cy as go od or better t han that listed in the specifications. Calibrat ion Procedur e Env ironment al rang e for ca librat ion: 23 ° C ± 5 ° C, < 80% RH Calibr ation interv al: 6 Mont hs 1 Discon nect a ll in puts f rom[...]

Mainte nance Oper ator pro tection fro m elec tric sh ock haza rd is pro vided by a double insulate d enclosu re. Ref er to pa ges 1-4 an d 1-5 for max imum vo ltage speci ficatio ns. When ser vicing, us e only speci fied repla cement pa rts. Battery Replacement Repl ace the batt ery when the symb ol appears in t he dis play or befor e calibrat ion[...]

Trou blesh ootin g Problem Possible Cause Suggested A ction Unit won ’t turn on Dead Ba tteries Replac e batteri es Unit wo n’t turn of f Inp ut limit exceede d Remov e test lead s and pres s any key to reset. Disp lay flashe s and Rapid beeps In put limit ex ceeded Re move te st leads an d press an y key to rese t. Battery Ann uncia tor on Low[...]

Spec ifications Calibration period: six months m inimum. Specifications apply at 23 ° C ± 5 ° C, < 80% RH Accuracy = ± (% of reading + number of digits) Temperature Coefficient = Accuracy 0.1/ ° C (0 ° C to 18 ° C; 28 ° C to 55 ° C) General Do not expose product to moisture or rain. Do not use product in fl ammable atmosphere. Operating[...]

AC + DC Voltage (rms responding, computed from acV, dcV) Range Res o l ut i o n Accur acy DC, 2 0 H z to 10 kHz DC, 10 kHz to 30 kHz DC, 30 kHz t o 50 kHZ DC, 50 kHz t o 100 kH z 5 V 1 mV ± (1% + 30) ± (1.2% + 4 0) ± (2.5 % + 70) ± (3. 5% + 300) 50 V 10 mV 500 V 100 m V 750 V 1 V ± (1% + 30) DC , 20 Hz to 1 kHz Not Specified Measurement range:[...]

Resistance Range Resolution Accura cy Test Curr ent Max Open Circuit Voltage 500 Ω 10 m Ω± (0. 06% + 2) 1 < 800 µ A < 5.5 V 5.0 k Ω 100 m Ω ± (0 .06% + 2) 50 k Ω 1 Ω < 80 µ A < 2.2 V 500 k Ω 10 Ω < 15 µ A 5.0 M Ω 10 0 Ω ± (0.5% + 1) < 1.5 µ A 50 M Ω 1 k Ω ± (1.0% + 2) < 150 nA 1 After zero adjust[...]

Temperature (5 k Ω @ 25 ° C Th ermist or prob e) ° C ° F Meas urement Range -80 ° to 150 ° -1 12 ° to 302 ° Resol ution 0.1 ° 0.1 ° Accura cy 1 ± 0.2 °± 0.4 ° 1 Accuracy does not include 5 k Ω Thermistor error dBm 600 Ω 1 mW reference (rms resp onding, computed from AC Voltage) Input dBm Input Voltage Accur acy 20 H z to 10 kH z [...]

Adjustme nts 6-1[...]

Calibrat ion Table CAUTI ON Danger ous volta ges are pr esent duri ng the cali brat ion pro cedure . Calibrat ion should only be per forme d by q uali fied servi ce tec hnicia ns u sing a no n-co nductiv e to ol. Step Function Range Input Signal Adju stmen t (limit ) Toleranc e (counts) 1 500 mV 50 0 mV Sh o rt — ± 2 2 480 .0 mV 1 ( ± 2) ± 26 [...]

Step Function Range Input Signal Adju stmen t (limit ) Toleranc e (counts) 17 V 50 V 48.0 00 V @ 10 kHz C3 ( ± 20) ± 27 0 18 48.000 V @ 10 0 kH z — ± 17 40 19 48.0 00 V @ 200 Hz — ± 270 20 500 m V 48 0.00 m V @ 10 kHz — ± 366 21 75 0 V 750.0 V @ 20 0 Hz — ± 105 22 Ω 500 Ω S hort zero ad just 1 ± 1 23 480. 00 Ω 9 ( ± 5) ± 30 2[...]

Repla ceable Pa rts/Access ories Ref er to the dis assembl y diag ram on page 6-5 . Call out Description HP Part Number F1 Fuse, 500 mA , 25 0 V fast blow Littl efus e 216-500 DO NOT S UBSTITUTE 2110-0 940 F2 Fu se, 15 A , 60 0 V fa st b low Li ttle fus e KL K15 DO NOT S UBSTITUTE 2110-0 941 MP1 Top ca se assemb ly 0097 4-6440 1 MP2 Dust/mo isture [...]

Disassembly WARNIN G Alway s disco nnect the test leads be fore openi ng th e case. Repl aceabl e Part s/Acc esso ries 6-5[...]

DECLARATION OF CONFORMITY according to ISO / IEC Guide 22 and EN 45014 Manuf acturer ’s Name: H ewlett-Packard Company, Personal Measurements Operation Manuf acture r’s Add ress: 815 14th S treet S.W., Loveland, Colorado 80537 U.S.A. declare s , that th e products Prod uct Name : Handheld Multimeter M o d e l N u m b e r : H P 971A, HP 972A, HP[...]

Warranty/Service Limited 3 Year Warran t y What is Co v e r ed The H P 9 7 4A M u ltim e t e r is w a r r a n t e d by H e w lett - P a c k a r d a g ai n st d efe c ts in m a t e ri a l s a n d w o r k ma n s h i p f o r t h r e e y e a r s f r om t h e d a te o f o r igi n al p u r c h a s e . If y ou s el l y o ur u nit o r gi v e it as a g if t[...]