About, "Hi All, I have a large dry dummy load and need to add some circuit to measure DC voltage for radio work. My question, does anyone have a simple circuit to add to the dummy load to produce a m
I haven't seen an analogue 'scope guaranteed to an accuracy of better than +/-5% of full screen. That means a possible power error of around +/-10%, excluding probe errors. Digital ones can get to 1%
I use a 10v standard to calibrate. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: am
to +/-10%, This is interesting, my Tektronix 2246 has a vertical deflection rating of WITHIN +- 2% 15deg C thru 35deg C! And it's SmartCursors (tm) Voltmeter has +- .5% of reading of reading + 2% of
+/-5% excluding analogue tone. Add known Any indirect measurement, i.e. evaluating RMS power through a voltage, needs calibration. So called in-line wattmeters are actually voltage/current meters, p
Very much so. One just needs to bear in mind that test gear does need re-calibrating, and as amateurs, we don't always do it as often as we should. Incidentally, approved European Test Houses should
"Any indirect measurement, i.e. evaluating RMS power through a voltage, needs calibration." Hmmm, The method I use (a 6AL5 with capacitor input filter at its cathode) delivers an accurate peak DC vol
Doesn't contact potential of the 6AL5 affect the accuracy? The problem with the voltage and current measurement schemes is that the error is squared, so a 3% error in measurement gives a 6% error in
Sheesh! Roy K6XK corresponding with the so a 3% there's mismatch For error. A 1.02:1 problem. HP from efficiency. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Ad