Hello,
I'm working with a 12 volt AC signal. I have the Voltage on channel A and the TA018 current clamp on channel B
I would like to calculate the impedance using a math channel A/B, and a measurement, but where the current goes through zero, the signal goes out of range. How do I get around this problem?
Of course, the more information I can get, the better, but I don't actually need more than just the AC rms impedance value because I am only making comparison measurements to a "known good" value. I thought there might be some mathematical technique or connection methodology to get around the problem right within Picoscope.
Most of the calculations cannot be done in PicoScope. But the measurements needed can be exported out. And could be easily be done in excel.
See this post on exporting measurement values- topic15481.html?hilit=batch
First you need to setup your channels and the measurements needed-
See the screen shot and example psdata file with-
-Channel A for- Volts
-Channel B for- Amps
-Maths channel - ChA x ChB (Instantaneous Power)
The measurements that are exported are- Volts- rms
Current(Amps) - rms
Apparent Power which is the DC average of Instantaneous Power (Volts x Amps)
The attachment AC vectors and Power factors.psdata is no longer available
Adding '+freq(A)-freq(A)' to it stops the start of the maths channel starting at a lower value.
When using the measures on these maths channels you need to set 'between time rulers' and move time rulers to exclude the start and the end of the maths channel.
I have attached a updated psdata file with these maths channels included.
Channel A must be used for Voltage
Channel B must be used for Current
Remember you can still take the three measurement values-
-'AC RMS' of Channel A for- Volts
-'AC RMS' of Channel B for- Amps
-'DC Average' of Maths channel - ChA x ChB (Instantaneous Power)
As before and enter these into the spreadsheet to check the calculations are correct.
I suggest turning off maths channels you don't need, or adding more 'view' windows if you need more maths channels (VA, Reactance X, etc).
If you are going to be doing three phase with 4824 remember a 'view' window only supports 8 channels/maths channels.
Note- The 'DC Average' measurements at the bottom, for channels-
'Power Instantaneous'
'Real Power (Pr)'
Should give almost the same values, small differents are due to the maths channels calculations.