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DEWESoft supports three basic types of frequency measurements: counter based, analog with DAQP-FREQ-A and serial with PAD-CNT2. We have already seen how to setup the counter based measurement in the previous chapters talking about frequency and super-counter measurements. Here it is also measured the same way to show the differences between certain methods. We are using the same electro motor with encoders and we also route the same signal to DAQP-FREQ-A and PAD-CNT2. So basically it's just a TTL signal with pulses. |
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We can define that:
| - | we use the counter method when the biggest precision is needed and the input signal is already conditioned (for order tracking, torsional vibration) |
| - | we use the analog FREQ-A method when we need to have variable input trigger levels and some delay of the output, since this is not a big issue |
| - | we can use the PAD module when the frequency signal is changing very slowly and the bandwidth and output delay is not important at all |
Required hardware |
Orion card, DAQP-FREQ-A and PAD-CNT2 |
Required software |
SE, PROF, DSA |
Setup sample rate |
At least 1 kHz |
Let's see how the measurement is set up and how we arrived at the conclusions stated above.
