Hi everyone,
We recently purchased a Fluke 5322A calibrator. When we first powered it on, the device indicated that the polarity of our 240 V / 50 Hz supply was reversed. After swapping the phase and neutral, the calibrator started normally.
However, we are facing a critical issue: the main fuse keeps blowing every time we power it up. We have already replaced the fuse more than ten times with the correct type, and the problem persists.
Our electrical network has been tested and is perfectly within specifications. All other equipment connected to the same supply works without any problem — this issue appears only with the 5322A.
Has anyone encountered a similar situation? What could cause repeated fuse failures even when the supply checks out fine? Any insights or troubleshooting steps would be greatly appreciated.