Legacy Hardware and Apps
How to measure frequency?

Dear Roger,

I want to know the method to measure frequency. For example, how can I measure the frequency of sine wave? Could you tell me the concrete wiring configuration?

Thank you

Dear Roger, I want to know the method to measure frequency. For example, how can I measure the frequency of sine wave? Could you tell me the concrete wiring configuration? Thank you

Good morning kangle2miao,

Yes you can. If your signal is less then +/- 2.5 VDC Peak to peak then you can use the analog inputs to read frequency.

Cheers,
Roger

Good morning kangle2miao, Yes you can. If your signal is less then +/- 2.5 VDC Peak to peak then you can use the analog inputs to read frequency. Cheers, Roger

Dear Roger,

I encountered an odd problem when I measured frequency. It followed this, when I measured signal with frequency 400-10KHz, there was no problem.

But when I measured signal with frequency 1-30 Hz, the returned data was wrong, 380Hz or so. Of course, I had changed P12=2000, and the signal was within 5 Vp-p. Could you tell me the reason?

Thank you

Dear Roger, I encountered an odd problem when I measured frequency. It followed this, when I measured signal with frequency 400-10KHz, there was no problem. But when I measured signal with frequency 1-30 Hz, the returned data was wrong, 380Hz or so. Of course, I had changed P12=2000, and the signal was within 5 Vp-p. Could you tell me the reason? Thank you

Good morning kangle2miao,

It could be due to noise in the signal.
When you have a higher frequency the difference between readings is large and noise won't be an issue. The DT800 is looking for a crossing point, and if the frequency is low, it might be counting crossings due to noise. Try locking the gain to the 1 volt range. This will effectively square up the input signal. You may want to try different gains to find the most effective gain range for your source.

Cheers,
Roger

Good morning kangle2miao, It could be due to noise in the signal. When you have a higher frequency the difference between readings is large and noise won't be an issue. The DT800 is looking for a crossing point, and if the frequency is low, it might be counting crossings due to noise. Try locking the gain to the 1 volt range. This will effectively square up the input signal. You may want to try different gains to find the most effective gain range for your source. Cheers, Roger
12
3
2
live preview
enter atleast 10 characters
WARNING: You mentioned %MENTIONS%, but they cannot see this message and will not be notified
Saving...
Saved
With selected deselect posts show selected posts
All posts under this topic will be deleted ?
Pending draft ... Click to resume editing
Discard draft