Voltage Measurement Accuracy Test Set-Up - HP 75000 C Series Service Manual

4-1 2. Voltage
This test verifies the voltage measurement accuracy of the
Measurement Accuracy
instrument. A dual cursor measurement is made so offset errors are
Test Procedure
not a factor.
1.
Connect the equipment
as
shown below.
Use
a banana-to-BNC
adapter to connect the BNC cable to the power supply. Monitor the
supply with the Multimeter. Set the power supply for 0 V output.
POWER SUPPLY
BNC TO DUAL
BNC TO
DUAL
BANANA C O M ~ N D OSC~LLOSCOPE
ADAPTER MODULE MODULE
1
Flgure
4-3.
Voltage Measurement Accuracy Test Set-up
2. Set the HP E1426A controls as follows:
...............................................
Reset HP E1426A *RST
Time base to automatic
............................
T1M:MOD AUT
..........................................
Start data acquisition RUN
Turn on channel
1
...................................
VIEW CHANl
Turn off unused channels
.....
BLAN CHANB,CHAN3,CHANI
........................
Channel
1
to DC at 1MR CHAN1:COUP DC
.....................
Acquisition type to average ACQ:TYP AVER
.............................
Acquisition count
to
32
ACQ:COUN 32
........................
Channel
1
range to
40
V
CHAN 1:RANG 40
......................
Channel
1
offset to
17.5 V
CHAN1:OFFS 17.5
Measure channel
1
.........................
MEAS:SOUR CHANl
.......................
Digitize channel
1
............
:.
DIG
CHANl
............................
Measure average voltage MEAS:VAV?
3. Verify that average voltage as measured by the HP E1426A is close
to
0
volts. Record the reading.
v1
=
4. Set the power supply to output 35 Vdc. Repeat steps
2
and 3. Record the
reading.
5. Subtract V l from V2. The difference should be between 34.5 V and
35.5
v.
4-8
Veriflcatlon Tests