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Unless it is a true RMS meter you'll need to build a peak detector circuit (and set the meter to DC) to measure the Vpk of a nonsinusoidal waveform. Note that this really only works for waveforms that are symmetrical in amplitude above and below zero, have no zero crossing, or have no DC offset. If it has a DC offset you could use a dc-blocking cap before the peak detector to still measure the Vpk. If it is nonsymmetrical you could measure Vpk of one side of zero, then reverse the peak detector's polarity (be sure to discharge the cap) to measure the other side of zero. Be sure to account for the Vf of the diode used in all cases.
Why would you use a meter to verify a scope, though? Normally it is the other way around!
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
So the fluke is technically only rated to handle 1kv where as your waveform appears to be a bit over that, so so you either will run the risk of melting the voltmeter or find a way to reduce the voltage output, but if you set the voltmeter to AC it should read the same number as the scope set to measure 'RMS' since the 177 is a true RMS voltmeter (note however that because the AC function is AC coupled, you need to AC couple the scope to get an accurate reading). I am not sure what it will read in DC mode, but I believe with the 177 should read the same value as the scope set to 'average' (of course the scope would need to be DC coupled for this measurement).
In any case, if at all possible you are better off using a DC voltage to perform the calibration...
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Ken, nice meter, expensive internal fuses! At work we all use Fluke meters, but rarely on current ranges due to the cost of fuses! I'm not saying don't use the current ranges, they are very useful, just be careful or have a supply of fuses.
As to your question, with your meter you can measure ac rms volts directly but the result has no real meaning other than a check to see if it is the same as a similar circuit or as previously measured e.g. if you measure the rms voltage when working properly a different measurement at a later date would indicate an incorrect waveform.
The 'best' way to measure this kind of waveform is what you have already done, an oscilloscope.
Registered Member #8247
Joined: Thu Nov 22 2012, 03:14AM
Location:
Posts: 18
Thanks for the responses. I'm actually trying to get the RMS voltage value of the ~1.3KVpeak shown on the scope. So I guess I have two more questions.
1) If the Fluke is limited to 1000V, is that 1000V limit a Vpeak limit or Vrms? If it is a true RMS multimeter then that should be 1000V RMS Max correct? So it should have no problem measuring 1.3KVpeak
2) To ask the same question again - do I set my Fluke to AC voltage or DC voltage to measure the RMS value of the 1.3KVpeak wave? If the sawtooth wave shown on the scope does not (essentially) drop below zero then I should set the Fluke to DC volts correct?
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
1) No voltage above 1000 V, instantaneous value, can be applied between any terminals. 1.3 kV peak can damage the meter. 2) RMS values are measured in the AC ranges. DC is the average value.
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Measure higher voltage on my new DMM
