Agilent 66312A driver

[NewCLAD]

Hi fellows,

I try to acquire the DC current measurement of my Agilent 66312A DC source via the NI driver. The problem I'm facing is that my read current with the labview driver is different from the device front panel read back value. Values are stable on the front panel device but not the read back values from labview driver, each read back values are different.

I try to change the current range, integration time (TINT) but that don't affect the measurement.

Please see in attached file the vi used to read the DC current. I wonder if the SCPI command is wrong ?

The main question is to know why the front panel DC current value is different from the driver read back value ?

Best regards,

Novice Programmer

System: WINXP SP3

LaBVIEW 8.5

[Albert.Geven]

HI

Is the difference noise or a real difference Amps e.g.

Or is the difference between set and measured value?

[NewCLAD]

Thanks Albert,

replyto your questions:

[Question] Is the difference noise or a real difference Amps e.g.

[Reply] It appears to be a real difference Amps, for instance I read 1.308mA and it's quite stable in the front panel device and when I acquire the DC current with labview driver I read some times 1.322mA, 1.298mA, 1,302mA. It's not stable enough to be taken in account for my data processing.

[Question] Or is the difference between set and measured value?

[Reply] To be clear with my setup, I power-up my board with the agilent 66312A and read the consumption current on it

Thanks and regards,

Armindo PINTO 

[Dennis_Knutson]

You can verify the SCPI command by comparing the code to what is in the manual. You can then execute the command in MAX.

[Albert.Geven]

So it seems to be noise that is filtered out by the frontpanel display software !