re: RF AC Voltage Probe Question

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From: MSgt Cameron C.R. Bailey (CBAILEY@PAMDT.ANG.AF.MIL)
Date: Fri Oct 13 1995 - 12:35:14 EDT


                                                    
Ted, here's one to try.

     0.01uf 4.7M

o----| |----*---\/\/\/\----o center conductor
            |
 RF in ---
           \ / 1N34A
           --- germanium coax to dc voltmeter
            |
            |
o-----------*--------------o ground

The resistor combines with the 10M input of the DVM to form a
voltage divider. The high resistance will reduce the value of the
peak voltage to a DC value equal to the rms of the RF voltage.
The peak to peak value would be about 2.8 times the RMS voltage.

The capacitor combines with the capacitance
of the coax to prevent RF from entering the meter.
Keep all leads as short as possible. Shielding the probe is a
good idea too.
                                                                
72 de kt3a

---------------------------------------------
Cam Bailey
SOGNET LAN Administrator (Banyan)
211 Engineering Installation Squadron
Fort Indiantown Gap (Annville) PA
DSN: 491-8737 Comm: 717-861-8737 FAX: 8268


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