Why 6570 Frequency Test Value is Wrong when using Banked Mode?

Updated Jul 19, 2023

Reported In

Hardware

  • PXIe-6570
  • PXIe-6571

Issue Details

Why 6570 frequency test value is wrong when using banked mode?
I would like to write a program to test the frequency(2kHz) of the API using 6570.
I found that when the parallel mode is used in the measurement mode, the accurate value can be measured normally. But the value is wrong when using banked mode.
How should I do to measure right value?

parallel mode
parallel.jfif
banked mode

Banked.jfif

Solution

Your program is fine. Paralle mode is default with hysteresis.

Hysteresis can reduce measurement noise.

If you disable the hysteresis, the value will be wrong. Banked mode is not supporting for hysteresis. Please find another good source to generate square wave.

Related Links

niDigital Frequency Counter Configure Measurement Mode (VI) - NI

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