PXI-4065

[Emna20]

Hi,

I want your help,

I want to know if I could see a PWM signal using NI PXI-4065.

Best Regard.

[GerdW]

Hi Emna,

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@Emna20 wrote:

I want to know if I could see a PWM signal using NI PXI-4065.

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You might "see" such a signal, but the readings might be senseless.

The PXI4065 is a DMM supporting DC and AC signals as written in its specs.

[santo_13]

Nope, it cannot measure PWM signals (other better DMM like 4081 has digitizer mode that could be used to look at PWM)

Unfortunately, you cannot measure a PWM signal using 4065.

Alternatively, you can estimate the PWM duty cycle by taking a DC measurement, this measurement when made over complete PWM cycles will result in an average-DC value.

For example, your PWM frequency is 50Hz 5V TTL signal

You can configure your DMM to measure DCV with 20ms aperture time, this way it measures the average-DC over a single PWM cycle, you can compute the duty-cycle based on measured average DC value against the signal voltage range, if you measure 2.5V then it is 50% duty cycle