Agilent Technologies 34970A, Service Manual

Page: 80 / 273

AC VOLTS Gain Verification Test
Configuration: AC Volts
LF 3 HZ:SLOW (in the Advanced menu)
1
Make sure you have read “Test Considerations” on page 71.
2
Select Channel 210, set the AC VOLTS function and the 3 Hz input
filter. With the slow filter selected, each measurement takes 7 seconds
to complete. Before executing each test, you must press
to
enable reading monitoring on the selected channel (or use the
ROUTe:MON
command from the remote interface).
3
Select each range in the order shown below. Compare measurement
results to the appropriate test limits shown in the table. (Be certain to
allow for appropriate source settling.)
Input
V rms Frequency
Range
Quick
Check
Error from Nominal
24 hour 90 day 1 year
100 mV
100 mV
1 V
1 V
10 V
10 V
10 V
10 mV
[1]
100 V
100 V
300 V
300 V
[2]
1 kHz
50 kHz
1 kHz
50 kHz
1 kHz
50 kHz
10 Hz
1 kHz
1 kHz
50 kHz
1 kHz
50 kHz 100 mV
1
10 V
100 mV
100 V
300 V
Q
Q
Q
±
70
µ
V
±
150
µ
V
±
700
µ
V
±
1.5 mV
±
7 mV
±
15 mV
±
7 mV
±
34 µ V
±
70 mV
±
150 mV
±
270 mV
±
600 mV
±
90
µ
V
±
160
µ
V
±
900
µ
V
±
1.6 mV
±
9 mV
±
16 mV
±
9 mV
±
45 µ V
±
90 mV
±
160 mV
±
390 mV
±
690 mV
±
100
µ
V
±
170
µ
V
±
1 mV
±
1.7 mV
±
10 mV
±
17 mV
±
10 mV
±
46 µ V
±
100 mV
±
170 mV
±
420 mV
±
720 mV
[1] For this test, isolate the calibrator’s output from earth ground.
[2] Some calibrators may have difficulty driving the internal DMM and cable load at this
V-Hz output. Use short, low capacitance cable to reduce calibration loading.
Verification can be performed at >195 Vrms. New test limits can be computed from
the accuracy specification shown in Chapter 1 for the actual test conditions used.
Q
: Quick performance verification test points.
Note:
The 50 kHz ac voltage test points may fail performance
verification if the internal shields have been removed and reinstalled.
See “Gain Adjustment,” on page 82, for further information on how to
recalibrate the ac voltage function.
Chapter 4 Calibration Procedures
Internal DMM Verification Tests
78