Keysight DAQ970A/DAQ973A Service Guide 15
Internal DMM Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Zero Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Zero and ADC calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
AC zero calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Capacitance zero calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Gain and flatness adjustment considerations . . . . . . . . . . . . . . . . . .55
Valid gain adjustment input values . . . . . . . . . . . . . . . . . . . . . . . . . .56
AC voltage low frequency gain and flatness calibration . . . . . . . . . .56
AC voltage gain and flatness calibration . . . . . . . . . . . . . . . . . . . . . .57
AC current gain and flatness calibration . . . . . . . . . . . . . . . . . . . . . .58
Frequency accuracy calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
DC voltage gain calibration (10 V) . . . . . . . . . . . . . . . . . . . . . . . . .60
Ohms gain calibration (2-wire and 4-wire) . . . . . . . . . . . . . . . . . . . .61
DC current gain calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
DC high voltage gain calibration (100 V) . . . . . . . . . . . . . . . . . . . .63
3 Performance Verification
Quick Performance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Internal DMM Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Zero Offset Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Gain Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Plug-in Module Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Relay Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
DAQM900A solid state relay on-resistance verification (optional) . .78
DAQM901A relay contact resistance verification (optional) . . . . . . .79
DAQM901A shorted relay contact verification . . . . . . . . . . . . . . . . .81
DAQM902A relay contact resistance verification (optional) . . . . . . .82
DAQM902A shorted relay contact verification . . . . . . . . . . . . . . . . .83
DAQM903A relay contact resistance verification (optional) . . . . . . .83
DAQM903A shorted relay contact verification . . . . . . . . . . . . . . . . .84
DAQM904A relay contact resistance verification (optional) . . . . . . .85
DAQM904A shorted relay contact verification . . . . . . . . . . . . . . . . .88
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