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Sensitive RF Voltmeter Probe

2017-12-23 09:21  
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Sensitive RF Voltmeter Probe


Sensitive RF Voltmeter Probe Circuit

This Circuit measures RF voltages beyond 200MHz and up to about 5V.

Sensitive RF Voltmeter Probe Circuit diagram

PARTS LIST
R14.7MΩ
R21MΩ
R31MΩ
R4100kΩ
R5330Ω
R610kΩ
R710kΩ
VR12kΩ
VR22kΩ
C10.001μF (Disc Ceramic)
C20.001μF(Disc Ceramic)
C30.01μF
D11N914
Q12N3819, 2N5459, MPF102
M1100μA
S1Switch
BT19V Battery

The Diode should be mounted in a remote probe, close to the probe tip. Sensitivity is excellent and voltage less than 1V peak can be easily measured. The unit can be calibrated by connecting the input to a known level of RF voltage, such as a calibrated signal generator, and setting the calibrate control.

VR1 =For? Calibrate

VR2 = For Zero set

MPF102 n-channel  JFET VHF Amplifier pin configuration

MPF102 N-Channel JFET VHF Amplifier Pin Configuration


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