[ARC5] RF Impacts On Instrumentation

[J Mcvey]

It may be a "procedural" issue. I have never come across a situation where the RF is so extreme that it permeates everything to that point.There are points that should not/can not  be tested with a DMM/VOM during transmit.. One such place would be the PA plates, or any other place that would have high amplitude RF on it at that time. If you want to check DC levels in the tx cycle, disable the oscillator.
A DC measurement won't be reliable in the presence of an AC signal no matter what.Maybe a scope would be more appropriate, but I wouldn't connect that directly to PA plates either.


 " 
 

    On Thursday, January 11, 2018 3:44 PM, Tom Lee <tomlee at ee.stanford.edu> wrote:
 

  It likely won't help much measuring V, but would make a difference measuring I. However, your best bet is to make coax test leads and keep the unshielded parts as short as possible.
 
 Tom
 -- 
Prof. Thomas H. Lee
Allen Bldg., CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3383 (public fax; no confidential information, please)  On 1/11/2018 12:23 PM, Robert Eleazer wrote:
  
 
I have my ARC-114 receiving and transmitting but I am having trouble figuring out what is going on with the power supply voltages and currents because the RF from the transmitter is getting into the VOMs, both the digital and analog models.   Will putting some toroids around the test leads help this?   Thanks,  
 Wayne WB5WSV 
 
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