At that price for the switch, my 11683A probably needs to be in the locked cabinet!
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On Oct 10, 2020, at 12:46 PM, Dave Smith W6TE <w6te@...> wrote:
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Building a 11683A isn¡¯t as simple as using an old 8481A and a few precision resistors. The range switch in the HP 11683A is not your run-of-the-mill SP 10 pos rotary switch. HP used a very low resistance contacts in the switch. In fact,
there¡¯s a procedure in the 11683A¡¯s manual for checking the integrity of the switch. The switch has an in house part number and Keysight lists the switch at $3.000!
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Gud luk
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Dave
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On Sat, Oct 10, 2020 at 7:07 AM Tom Holmes <tholmes@...> wrote:
By the way, what is involved in calibrating a power meter, not the sensor?
An 11683A, 432A plus 478A-H75 sensor, a counter and a DMM.
11683A is rare, but you can make one from a dead 8481A (and there are plenty of those around):
Then you just need a stable voltage source in the range of a few hundred uV to 15.8 V.
I made one and using a Fluke 343A as a voltage source and 34461A to measure the voltage, my 346A gave readings well within specs.
Calibrating the power reference is difficult... it requires the H75 option for the 478A sensor (good luck finding that) and a somewhat complicated procedure involving measuring voltages from the 432A.
