How can we substitute the invalid option "reset after read" in FP-CTR-500 + FP-1600 frequency measurement application?

[Puho]

We nned to incorpore the values of 2 frequency signals (0-10 Khz)into a process controlled by a VisualBasic application running on 1 PC with W'95. Because the FP-CTR-500 working with FP-1600 hasn't the option "reset after read", the process of reading is a bit complicate, and sometimes, we receive wrong values of frequency from those devices. Could you help me? Is there any extremely reliable method of reading? Best regards,

Puho

[Aaron_G]

For frequency measurement information on the FP-CTR-500/502 modules. Please see KnowledgeBase Article #1TB63SUS
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/d8db42f9fdc3607e862568640047f144?OpenDocument

Ultimately, the FP-CTR-500/502 modules are not designed for frequency measurement, although it is possible to use them to measure frequency. The one thing is that it works best to do the measurements over relatively long integration periods (1/4 second or more).

Regards,
Aaron

[Puho]

There is no problem in this case. Those frequencies are relative to the main aluminium potline current signal. The process of reading is very slow and the range o frequency is 0-10 KHz. By this way , I think it is possible to use a period of 1 second for example. By the same way, we need to read 4 frequency inputs (currents) simultaneously and we must to assure those 4 readings with high reliability, to compare between them.

Regards,
Puho

[Puho]

There is no problem in this case. Those frequencies are relative to the main aluminium potline current signal. The process of reading is very slow and the range o frequency is 0-10 KHz. By this way , I think it is possible to use a period of 1 second for example. By the same way, we need to read 4 frequency inputs (currents) simultaneously and we must to assure those 4 readings with high reliability, to compare between them.

Regards,
Puho