Fluke 408B power supply

Fluke Model 408B is a high‑voltage DC power supply capable of 0–6 kV at up to 20 mA, with voltage set by four decade switches and a vernier pot. Common failure modes include tube burnout or cracked HV output leads (often from storage), aging electrolytic capacitors in the HV section, and control‑board faults that prevent proper charging. First‑check diagnostics: verify the unit powers on and reaches standby within ~60 s; inspect the HV output connector for cracks or burn marks; test the output with a high‑voltage meter to confirm 0–6 kV range and current limit; review any error codes displayed on the front panel.[oss-gpt-20b] Post Comment

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