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5700A/5720A Series II Calibrator
Service Manual
5-4
2704 Spare
This fault code is not used.
2705 A7: Oven Regulation Fault
The heater voltage of the current hybrid is measured by dividing OVEN TEMP down
and connecting it to the SDL line where it is measured by the adc circuit on the DAC
assembly to ensure the hybrid is warmed up and regulating. OVEN TEMP should be
0.7V ±10% ±0.2V. A failure indicates the Current/Hi Res assembly (A7) is probably at
fault.
2706 A7: Current Compliance Fault
The Current assembly is configured into each of its ranges in both the dc and ac mode.
The output current is connected to the 1.2Ω load resistor. The compliance voltage is
determined by measuring the output side of the shunt resistor via the
Current/Compliance Voltage Monitor circuit. This fault occurs if the voltage is 10% over
the expected. A failure indicates the Current/Hi Res assembly (A7) is probably at fault.
2707 A7: Hardware Initialization Fault
This fault occurs if the diagnostics software was unable to properly set the Current
assembly hardware for diagnostics testing. A failure indicates the Current/Hi Res
assembly (A7) is probably at fault.
2708 Spare
This fault code is not used.
2709 A7: Current Magnitude Fault
The Current assembly is configured into each of its ranges in both the dc and ac mode.
The output current is connected to the 1.2Ω load resistor and the current is calculated by
measuring the voltage drop across the shunt resistance. This fault occurs if the voltage is
10% over the expected. A failure indicates the Current/Hi Res assembly (A7) is probably
at fault.
2710 A7: Dummy Load Current Fault
The Current assembly is configured into each of its dc ranges. The output current is
connected to the 1.2Ω load resistor and the resulting voltage on DUMMY LOAD is
connected to the SDL line where it is measured by the adc circuit on the DAC assembly.
This fault occurs if the current is over 10% ±5 mA of the output current. A failure
indicates the Current/Hi Res assembly (A7) is probably at fault.
2711 Assembly A7 Is Not Responding
At power up the instrument checks to see what assemblies are not installed. This test
verifies that the Current assembly is not responding. A failure indicates the Current/Hi
Res assembly (A7) is probably at fault.
2712 A7: Hi-Res Clock Fault
The Hi-Res clock circuit is checked by connecting HI-RES CLOCK to the SDL line
which is measured by the adc circuit on the DAC assembly for 2.5V ±200 mV. A failure
indicates the Current/Hi Res assembly (A7) is probably at fault.