Re: HP 478 A? Thermistor mounts
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Thanks! The primary method of ruining a thermistor mount is to put too much power into it. Consequently, some users keep a 10dB attenuator permanently attached to it.? N6WFO?
Jeremy,? Maybe Div 4 is Standford Park.? ?I think they were the cal lab the service centers (when there were about 5 or 6 of them) used.? ? ? ?I remember using the 432A/478 to test the 50 MHz references in the power meters plus the 435 (K05 maybe) dual power reference.? The 432A's meter movement itself wasn't used but the DC outputs were measured and the power was calculated from those voltages.? Having checked many of these power references I can't remember any of them being out of spec.? ??
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Jeremy Nichols