HPE 1420b Measurement Problems

I have an HPE 1420B freq/cntr board. I can read frequencies using the hpe1420b_stand_meas()
NI driver calls (CVI 5.0), HOWEVER, for low frequency signals I get time-out
errors.
It is not symetrical across channels (occurs near 150 HZ on inp2 but low
frequency ~3Hz works on inp1). I'm using the same code for both channels.
What it appears NOT TO BE:
* an aperature problem
* trigger level problem
* signal amplitude
* AC vs DC coupling
* a board problem (2 boards show same effect)

Hello
pinnacle1406,
I was
wondering if you could clarify some of the information about this problem:
1. When you
say the measurements are incorrect, what do you mean? I have attached a circuit
diagram below. What are the values when measured at point 1 (across both
resistors), point 2 (across 3.3k ohm resistor) and point 3 (across 4.7k ohm
resistor)?
2. You said
you tried the measurement on about 6 different NI ELVIS’s, are the measurements
consistent on each station?
3. How are
you measuring the current with the NI ELVIS? Are you using the Digital
Multimeter Express VI in LabVIEW? Are you using the NI ELVIS Instrument
Launcher?
4. What DAQ
card are you using to take measurements from your NI ELVIS?
5. Are you
using the proper null correction to lower the noise error?
From the NI
ELVIS Suite data sheet, the current specifications are given as:
DC accuracy ........................................
0.25% ±3 mA2
2Proper
null correction at the common-mode voltage can reduce ±3 mA error to 200 μA
noise.
Even with
proper null correction, your current may be too small for the NI ELVIS to
measure. If you are just trying to demonstrate the current dissipated in a
simple circuit, I would recommend changing the resistor values so that you have
a larger current running through your circuit.
I hope this
information is helpful. Please let me know if you have any additional
questions.
Message Edited by Matt A on 01-18-2007 07:30 PM
Message Edited by Matt A on 01-18-2007 07:30 PM
Message Edited by Matt A on 01-18-2007 07:31 PM
Matt Anderson
Hardware Services Marketing Manager
National Instruments
Attachments:
circuit.GIF ‏3 KB

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sorry, my mistake.
This is applicable.
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