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5700A/5720A Series II Calibrator
Service Manual
5-36
3822 Spare
This fault code is not used.
3823 Spare
This fault code is not used.
3824 A8: Oven Regulation Fault
The heater voltage of the Switch Matrix HR1 hybrid assembly is measured to ensure it is
warmed up and regulating by connecting OVEN TEMP to the SDL line where it is
measured by the adc circuit on the DAC assembly. OVEN TEMP is measured to be 0.7V
±10% ±0.2V. A failure indicates the Switch Matrix (A8) assembly is probably at fault.
3825 Assembly A8 Not Responding
At power up the instrument checks to see what assemblies are not installed. This test
verifies that the Switch Matrix assembly is not responding. A failure indicates the Switch
Matrix (A8) assembly is probably at fault.
3826 A8: 8255 Was Reset
The control word of the 8255 on the Switch Matrix assembly is read. A failure indicates
the Switch Matrix (A8) assembly is probably at fault.
3827 Assembly A8 Too Hot
3900 A5: 8255 Control Word
The diagnostics software reads the control word of the 8255 IC on the Wideband Output
assembly. A failure indicates the Wideband Output (A5) assembly is probably at fault.
3901 A5: 8255 Port A Fault
The diagnostics software writes and reads data to port A of the 8255 IC on the Wideband
Output assembly. A failure indicates the Wideband Output (A5) assembly is probably at
fault.
3902 A5: 8255 Port B Fault
The diagnostics software reads port B of the 8255 IC on the Wideband Output assembly.
A failure indicates the Wideband Output (A5) assembly is probably at fault.
3903 A5: 8255 Port C Fault
The diagnostics software reads port C of the 8255 IC on the Wideband Output assembly.
A failure indicates the Wideband Output (A5) assembly is probably at fault.
3904 Optional Assemblies A5/A6 Are Missing
At power up the instrument checks to see what assemblies are not installed. This test
verifies that the Wideband Output is not responding. A failure indicates the Wideband
Output (A5) assembly is probably at fault.