Attenuation Ratio 100:1 Probe & voltage tests

[Kiriakos GR]

I did run some AC/DC voltage tests in a common 1X/10X probe so to understand it behavior and the measurement were made by a multimeter.

30V DC (1X) / 15,88V at 10X

5V AC 100Hz (1X) / 2,40V at 10X

What I am asking is if someone own an 100X probe to measure it and report the actual voltage drop that causes in AC & DC volts.

[budm]

Re: Attenuation Ratio 100:1 Probe & voltage tests

Is this scope probe used on DMM?
Since typical DMM input impedance is around 10M, the 10X probe has 9M resistor ( in series with probe to increase impedance. That is why you are getting abut 1/2 of the voltage source reading.
http://www.radio-electronics.com/inf...ope-probes.php

[Kiriakos GR]

Re: Attenuation Ratio 100:1 Probe & voltage tests

Yes sorry my bad, even by been armed with the relative accessories, the hard part for me is to combine knowledge and parts at the time that I am practicing those magic tricks. LOL

Even so I am curious to know even which is the voltage drop from one unbalanced 100x probe.

[Longbow]

Re: Attenuation Ratio 100:1 Probe & voltage tests

A 1x/10x scope probe will not be suitable to obtain accurate readings with a multimeter. Scope probes are built using nichrome resistance wire to minimize AC peaking due to cable capacitance. The usual (safe) multimeter might be good to 600-1000v. If you really need to measure in the 10,000 volt range, a high voltage probe made for TV repair would be best. In that case you will have a 100x probe. Many have a simple built in meter, so you won't risk damaging your DVM. Adequate probe insulation mandatory. Accuracy at the 10,000 volt level or greater is usually not too important. If you use any HV probe with a meter or a scope, be very certain that you have a solid ground at the probe, otherwise the full HV will be supplied to the DVM or the scope. Last, if a HV AC waveform is needed, no direct connection is necessary. Just hold the probe near the source of the HV. A good example is to hold a 1x10x scope probe near to any electronic florescent lamp to get a good scope waveform.