Instruction/ maintenance manual of the product 00974-90002 HP (Hewlett-Packard)
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HP 974A Multimet er User’s Guide Part Number 00974-90002 March 1995 © Copyright Hewlett-Packard Company 1994, 1995 All Rights Reserve d.
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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 . . . . . .
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.
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 .
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.
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 g.
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.
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 .
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 T.
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.
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 • ••••• •• .
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.
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.
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.
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.
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.
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.
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.
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.
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 .
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.
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-.
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.
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 .
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