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Bit of a long shot on here but does anyone have a circuit diagram for a Chavin Arnoux CA 6545 5kV tester? I've copied my post on EEVBLOG forum below.
We've got a Chauvin Arnoux CA 6545 5kV Megohmmeter that's developed a fault. Initial fault was it wouldn't IR at 5kV, zero volts even with probes open circuit. The 500v, 1kV and 2.5kV were fine. It was sent off for repair and we got told it was too old and parts were no longer available. Not being one to throw things away I took a look. Since it came back from repair(!) it had developed 2 more faults. It wouldn't charge (blown fuse on charge board) and all ranges now showed a 'Fuse G' fault. According to the manual this fault refers to the ground terminal fuse. After a bit of checking I found a cracked resistor which I replaced. It now works on 500v & 1kv but shows 'Fuse G' on 2.5kv and 5kv. There's a heat shrinked package (red package in last 2 pictures) connected between 'G' and '+' which contains 5 x 222 6Kv caps wired in parallel and 2 x 10k resistors (1 each side of the caps). I didn't have a capacitance meter with me to check these. Anyone have any experience of these meters and can shed some light on my next move or have a circuit diagram???
We've got a Chauvin Arnoux CA 6545 5kV Megohmmeter that's developed a fault. Initial fault was it wouldn't IR at 5kV, zero volts even with probes open circuit. The 500v, 1kV and 2.5kV were fine. It was sent off for repair and we got told it was too old and parts were no longer available. Not being one to throw things away I took a look. Since it came back from repair(!) it had developed 2 more faults. It wouldn't charge (blown fuse on charge board) and all ranges now showed a 'Fuse G' fault. According to the manual this fault refers to the ground terminal fuse. After a bit of checking I found a cracked resistor which I replaced. It now works on 500v & 1kv but shows 'Fuse G' on 2.5kv and 5kv. There's a heat shrinked package (red package in last 2 pictures) connected between 'G' and '+' which contains 5 x 222 6Kv caps wired in parallel and 2 x 10k resistors (1 each side of the caps). I didn't have a capacitance meter with me to check these. Anyone have any experience of these meters and can shed some light on my next move or have a circuit diagram???
