1054 input question

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berkinet
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1054 input question

Post by berkinet »

I am using a relay to switch the 5vdc source from a 1054 frequency counter back to its positive input. The negative input is tied to the onboard ground. And there is a 4.7k ohm resistor between positive input and ground (pull-down). The displayed input frequency can be around 0.5hz or around 4h.z However, I am seeing wide ranges: 2 to 4hz and 3 to 9hz. I suspect I may have the wrong value for the resistor or may need to clean up the signal a bit.

BTW, I currently have the data interval at 1 second, and that has help[ed a bit.

Suggestions?
Last edited by berkinet on Tue Aug 17, 2021 10:05 am, edited 1 time in total.
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mparadis
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Re: 1054 input question

Post by mparadis »

If it's a mechanical relay you might be seeing some contact bounce which would mess with the frequency signal.
berkinet
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Re: 1054 input question

Post by berkinet »

mparadis wrote:If it's a mechanical relay you might be seeing some contact bounce which would mess with the frequency signal.
Indeed. This did the trick... Thanks.
circuit2.png
circuit2.png (28.69 KiB) Viewed 6631 times
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