2 Calibration Procedures
56 Keysight DAQ970A/DAQ973A Service Guide
Valid gain adjustment input values
Gain calibration can be accomplished using the following input values:
AC voltage low frequency gain and flatness calibration
1 Ensure that you have read the “Test Considerations” on page 47 and the “Gain
and flatness adjustment considerations” on page 55.
2 Ensure that you follow the sequence listed in the “Calibration Adjustment
Sequence” on page 51.
3 This procedure will measure and adjust the input signal from the calibrator
source connected to Channel 302 (AC voltage). See the connections in “Input
test signal” on page 38.
4 Select Channel 302 and configure the function in the order shown in the table
below and enable Channel Monitor on the selected channel before each test
(see “Channel monitor” on page 50).
5 Apply the input voltage per the input column in Table 2-1 and allow for
appropriate source settling.
6 Enter the calibration value per the applied input voltage in step 5 and press
Perform Cal Step to begin the adjustment procedure (see “Entering calibration
values” on page 46).
Function Range Valid amplitude input values
DC voltage
100 mV to 100 V
300V
0.9 to 1.1 x Full Scale
0.9 to 1.0 x Full Scale
DC current 1 mA to 1 A 0.9 to 1.1 x Full Scale
Ohms 2W and 4W 100 W to 100 MW 0.9 to 1.1 x Full Scale
AC voltage RMS
[a]
[a] Valid frequencies are nominal frequencies ±1%.
100 mV to 100 V
300V
0.9 to 1.1 x Full Scale
0.9 to 1.0 x Full Scale
AC current RMS
[a]
100 μA to 1 A 0.9 to 1.1 x Full Scale
Frequency Auto Input >100 mV rms, 1 kHz to 100 kHz
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