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5700A/5720A Series II Calibrator
Service Manual
5-28
resulting in a -130V Power Amplifier output. The second is the normal 220V dc
operation with the input voltage from the DAC assembly. In this mode the Power
Amplifier is outputting 22.1V, 100V, 219V, and -219V. In each mode the Power
Amplifier output voltage is measured to be the nominal ±10% by connecting MUX3 to
the SDL line where it is measured by the adc circuit on the DAC assembly. A failure
indicates the Power Amplifier assembly (A16) is probably at fault.
3511 A16: Incorrect PA Input
The instrument is set to the dc 220V range with two modes of operation. The first is with
the Power Amplifier input voltage being the 6.5V reference voltage (BRF6, BSRF6)
resulting in a -130V Power Amplifier output. The second is the normal 220V dc
operation with the input voltage from the DAC assembly. In this mode the Power
Amplifier is outputting 22.1V, 100V, 219V, and -219V. The 6.5V reference input or the
resulting -1.105V, -5.0V, -10.95V, and 10.95V respectively from the DAC, is measured
to be the nominal ±10% by connecting MUX5 to the SDL line where it is measured by
the adc circuit on the DAC assembly. A failure indicates the Power Amplifier assembly
(A16) is probably at fault.
3512 Spare
This fault code is not used.
3513 Spare
This fault code is not used.
3514 Spare
This fault code is not used.
3515 Spare
This fault code is not used.
3516 Spare
This fault code is not used.
3517 Spare
This fault code is not used.
3518 Spare
This fault code is not used.
3519 Spare
This fault code is not used.
3520 A16: PA Oven Regulation Fault
The heater voltage of the Power Amp hybrid is measured by connecting MUX7 to the
SDL line where it is measured by the adc circuit on the DAC assembly to ensure the