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university:tools:m1k:alice:voltmeter-users-guide [09 Feb 2018 16:40] – Doug Merceruniversity:tools:m1k:alice:voltmeter-users-guide [19 Dec 2018 21:54] (current) – Add typical values for offset and Gain correction Michele Zaffalon
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 =====Calibrating the Voltmeter===== =====Calibrating the Voltmeter=====
  
-The program starts with the gain calibration factors set to 1.0 and the offset calibration factors set to 0.0. The first step in the calibration procedure is to connect both input channels to ground. Press the Run button. The screen should look something like figure 2 with some small non-zero values for CA Volts and CB Volts. You can pause (stop button) the program after a few seconds and it looks like you are getting a steady reading.+The program starts with the gain calibration factors set to 1.0 and the offset calibration factors set to 0.0. The first step in the calibration procedure is to connect both input channels to ground. Press the Run button. The screen should look something like figure 2 with some small (of the order of 1mV) non-zero values for CA Volts and CB Volts. You can pause (stop button) the program after a few seconds and it looks like you are getting a steady reading.
  
 {{ :university:tools:m1k:alice:volt-meter-screen-2.png?200 |}} {{ :university:tools:m1k:alice:volt-meter-screen-2.png?200 |}}
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 <WRAP centeralign>Figure 5, Cal step 3, Both inputs connected to AD584 output</WRAP> <WRAP centeralign>Figure 5, Cal step 3, Both inputs connected to AD584 output</WRAP>
  
-We want to calculate values for the channel A and B gain such that the measurements displayed are equal to the actual 2.500 volts of the reference. The Gain correction factor is simply 2.500 V divided by the un adjusted measured value. In the case for channel A in figure 5 we get 2.500/2.4383 or 1.0253. We do that for both channels and enter the results in the gain entry windows as shown in figure 6. Press the Run button. The screen should look something like figure 6 with values for CA Volts and CB Volts almost exactly equal to 2.5 Volts. If not try making small adjustments to the gain factors.+We want to calculate values for the channel A and B gain such that the measurements displayed are equal to the actual 2.500 volts of the reference. The Gain correction factor is simply 2.500 V divided by the unadjusted measured value. In the case for channel A in figure 5 we get 2.500/2.4383 or 1.0253; typical Gain correction factors are a few percent. We do that for both channels and enter the results in the gain entry windows as shown in figure 6. Press the Run button. The screen should look something like figure 6 with values for CA Volts and CB Volts almost exactly equal to 2.5 Volts. If not try making small adjustments to the gain factors.
  
 {{ :university:tools:m1k:alice:volt-meter-screen-5.png?200 |}} {{ :university:tools:m1k:alice:volt-meter-screen-5.png?200 |}}
university/tools/m1k/alice/voltmeter-users-guide.txt · Last modified: 19 Dec 2018 21:54 by Michele Zaffalon

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