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| EMI test receiver HP 85422E sweeps wrong frequency (100MHz = 73MHz) |
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| KlausKragelund:
Hi I recently bought a EMI test receiver HP 85422E at an auction. I have tested it, directing a single frequency into the RF input. The gain is spot on, at most 0.5dB off. But the frequency is wrong. If I enter 50MHz, I get 20MHz peak. If I then add 100MHz, it only increased the peak by 73MHz. It's consistent, every time I increase by 100MHz, only 73MHz is seen (generator has been checked on another spectrum analyzer) I guess it works by sweeping a local oscillator, and generating an IF frequency. What could be wrong? Regards Klaus |
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