
To verify voltage measurement accuracy
In this test you verify the voltage measurement accuracy by measuring the
output of a power supply using dual cursors on the oscilloscope, and
comparing the results with a multimeter.
Test limits: ±2.4% of full scale*
*
Full scale is defined as 56 mV on the 5 mV/div and 2 mV/div ranges. Full scale on all
other ranges is defined as 8 divisions times the V/div setting.
Table 4-3 Equipment Required
Equipment Critical specifications Recommended
Model/Part
Power supply 14 mV to 35 Vdc, 0.1 mV resolution Agilent 6114A
Digital multimeter Better than 0.01% accuracy Agilent 34401A
Cable BNC, Qty 2 Agilent 10503A
Shorting cap BNC Agilent 1250-0774
Adapter BNC (f) to banana (m) Agilent 1251-2277
Adapter BNC tee (m) (f) (f) Agilent 1250-0781
1 Set up the oscilloscope.
a Press Setup , then press the Default Setup softkey.
b Adjust the channel 1 Position knob to place the baseline at
approximately 0.5 division from the bottom of the display.
c Set the Volts/Div to the first line of table 4-4.
d Press Display , press the Average softkey, then set # Average
softkey to 64. Wait a few seconds for the measurement to settle; the
Av letters in the status line indicate how much of the averaging
process is finished by turning to inverse video as the oscilloscope
performs averaging.
2
Press Cursors , then press the V1 softkey.
3 Using the cursors knob, set the V1 cursor on the baseline of the
signal.
Service
Verifying Oscilloscope Performance
4-8
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