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5700A/5720A Series II Calibrator
Service Manual
5-26
measured via the RCL line. The output of this ac/ac sensor is measured by comparing it
to the DAC assembly output voltage. The difference is measured to be 0V ±100 mV. A
failure indicates the Oscillator Control assembly (A12) is probably at fault.
3422 A12: AC Cal Sensor (20V Range)
The instrument is set for 21.9V 1 kHz and configured as in the 20V range ac/ac
calibration. The output of the ac/ac sensor on the Oscillator Control assembly is
measured via the RCL line. The output of this ac/ac sensor is measured by comparing it
to the DAC assembly output voltage. The difference is measured to be 0V ±100 mV. A
failure indicates the Oscillator Control assembly (A12) is probably at fault.
3423 Assembly A12 Missing
At power up the instrument checks to see what assemblies are not installed. This test
confirms that the Oscillator Control assembly is not responding. A failure indicates the
Oscillator Control assembly (A12) is probably at fault.
3424 Assembly A13 Missing
At power up the instrument checks to see what assemblies are not installed. This test
confirms that the Oscillator Output assembly is not responding. A failure indicates the
Oscillator Output assembly (A13) is probably at fault.
3425 Assembly A12 Or A13 Not Responding
Communication with both Oscillator assemblies is checked. A failure indicates that one
or both assemblies are not responding.
3426 A12: 8255 Was Reset
The control word of the 8255 on the Oscillator Control assembly is read. A failure
indicates the Oscillator Control assembly (A12) is probably at fault.
3427 A13: 8255 Was Reset
The control word of the 8255 on the Oscillator Output assembly is read. A failure
indicates the Oscillator Output assembly (A13) is probably at fault.
3500 A16: 8255 Control Word
The diagnostics software reads the control word of the 8255 IC on the Power Amp
assembly. A failure indicates the Power Amp assembly (A16) is probably at fault.
3501 A16: 8255 Port A
The diagnostics software writes and reads data to port A of the 8255 IC on the Power
Amp assembly. A failure indicates the Power Amp assembly (A16) is probably at fault.
3502 A16: 8255 Port B
The diagnostics software reads port B of the 8255 IC on the Power Amp assembly. A
failure indicates the Power Amp assembly (A16) is probably at fault.