out of meter can be fed in a simple voltage divider?

I managed to install this labview program: http://www.ni.com/white-paper/2991/en

and I know it works because I see a pulse when connecting to the Terminal counter on the BNC-2110 block train on the oscilloscope.

I use a DAQ 6259 pci-e card.

I noticed the amplitude of the signal is about 5V, but I need it to be approximately 3V.  Then I fed the pulse train in a circuit voltage divider simple that looks like:

Above v1 is actually the PWM signal from the counter of the BNC-2110 block Terminal.  However, when I measure the amplitude on the oscilloscope, it's always as 5V (or perhaps 4.9).

Am I missing something big here?

Hi invasion2121,

There should be no problem with dividing the output voltage of your meter.  Your photo has been cut off slightly in head - are survey you the voltage falls through R7 where you see 4, 9-5 V?  That means the voltage on the rest of the circuit looks like?  The output of the counter provide more than 5 V output to the Earth, so if A7 is down more than that, then your voltage on R1 and R2 should be almost 0.

What is the impedance of your reach?  This can have an effect on your measure, but not as you describe.

Kind regards

Tags: NI Software

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