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Subject to change without notice

Control-Elements

 DISPLAY

 (7-segment LED + LED)

The digital display shows the measurement value 
with 4¾ digit resolution, in which the largest fi -
gure is used up to “5”. It will also display various 
warning messages. The measurement value will 
be displayed with decimal points and polarity sign. 
For DC measurement, a minus sign will appear 
in front of the fi gures when the positive polarity 
of the measured value is connected to the COM 
input 

.

    (LED)

Indicator denoting validation of the audible con-
tinuity  test  signal.  When  used  as  an  ohmmeter, 
the audible signal triggers when the measured 
resistance value is less than 0.1% of the range 
or 50 counts. For other functions, the indicator 
is hidden.

    BEEP

 (pushbutton)

Pushbutton for activating the audible signal.

 A  

(safety terminal for 4 mm banana plugs)

Connection (high potential) for DC and AC 
current measurements in the 10 A range in con-
junction with the COM input 

 (low potential). 

Current in excess of 10 A (max. 20 A) must 
not be applied for a period exceeding 30 
s, otherwise the internal measurement 
resistor thermal device will blow.

 mA  

 (safety terminal for 4 mm banana plugs)

Connection (high potential) for DC and AC current 
measurements up to 500 mA in conjunction with 
COM input 

 (low potential). The input is fuse-

protected. 

  HOLD

 (LED)

Indicator denoting that the displayed value has 
been frozen. The function can be activated using 
key 

. Deactivation is by pressing the HOLD/

OFFSET key.

 COM   

(safety terminal for 4 mm bana plugs)

The COM terminal (low potential) is the common 
connector for all the measurement functions to 
which the potential close to the ground of the 
measured quantity will be applied.

For safety reasons, the voltage across 
this terminal compared to the case (guard 
wire, ground) shall be 250 V at most.

  OFFSET 

(LED)

Indicator denoting that the displayed value is a 
relative measurement. The displayed value cor-
responds to the input value less the value present 

C o n t r o l - E l e m e n t s          

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5

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Summary of Contents for HM 8012

Page 1: ...tion 10 V 0 01dBm 10nA 10m 0 1 C F Offset function relative value measurement in basicmeasurement functions Input impedance 1G 0 5V and 5V DC range RS 232 interface PC software for control and data lo...

Page 2: ...curacy 23 8 59 8dBm 0 2dBm Resolution 0 01dB above 9mV CMRR3 60dB 50 60Hz 0 5 Crest factor 7 max AC current Measurement ranges 500 A 5mA 50mA 500mA 10A Resolution 10nA 100nA 1 A 10 A 1mA Accuracy 0 5...

Page 3: ...r discon nection of the protective earth terminal is likely to render the instrument dangerous Intentional interruption is prohibited The istrument must be disconnected and secured against unintention...

Page 4: ...ould be taken to ensure that it properly ts under the edges of the front and rear frames After removal of the two screws at the rear of the module both chassis covers can be lifted When reclosing the...

Page 5: ...in con junction with the COM input low potential Current in excess of 10 A max 20 A must not be applied for a period exceeding 30 s otherwise the internal measurement resistor thermal device will blo...

Page 6: ...er range On each press the new range is displayed eetingly on the display in code form L1 for lowest range L2 for second range etc pushbutton Pushbutton for changing to higher range Each time pressed...

Page 7: ...ower range is obtained when the value drops below 4 900 counts It is possible to know which range has been selected by the unit by temporarily deactivating the AUTO mode so that the range indication c...

Page 8: ...8012 should be connected to the circuit whosepotentialwithrespecttogroundislowest For safety reasons the COM terminal must not exceed 250VDC with respect to ground Currentrangesareprotectedbyfuseagain...

Page 9: ...erpreting measurement values and for evaluating its accuracy It is de ned as the ratio between the peak voltage and the rms value of the signal Crest factor CF Vp VRMS It is a measurement of the dynam...

Page 10: ...temperature of 0 C and using the OFFSET function Note Measurement of the temperature probe line resistance should be made on the same in strument used for temperature measurements Only this procedure...

Page 11: ...eys on the front panel AY CR switches to automatic range change AN CR switches to manual range change R CR switches to the next higher range R CR switches to the next lower range If it is impossible t...

Page 12: ...mA Diode 3 50 V 50 k 50 mA 4 500 V 500 k 500 mA 5 1000 V 5 M 6 50 M 10 A P CR This command alone is used for reco vering complete parameter settings of the equipment The instrument returns string_F s...

Page 13: ...500 k 5M 0 02 for instance models CNS020 by Vishay Test procedure If one of the indicated calibrators is available or if precision calibrators are appropriate all the HM8012 measurements ranges can be...

Page 14: ...guration This one can be saved and recalled later When the con guration of the instrument is done a set of measurements can be carried out and saved for future use Furthermore the software can show d...

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