Fluke 5720A service manual Spare, 2705 A7 Oven Regulation Fault, 2706 A7 Current Compliance Fault

5700A/5720A Series II Calibrator

Service Manual

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.

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