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IVI Driver Error? Temperature measurement

Question asked by MarcoHofmann on Oct 25, 2010
Latest reply on Nov 9, 2010 by changmeikuan

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Hi,

I use an Agilent 34970A for temperature measurement. A PT1000 is connected to channel 108 and as far as I control the 34970A at the front plate everything works fine.
In my software I use the latest IVI drivers but when I set channel 108 for temperature measurement with a PT1000 and perform a measurement on this channel the 34970A switches back to the default settings (PT100) and shows me "OVLD" in the display.
I also get no temperature value from the device/ from the IVI driver.

Does anyone have an idea what could be wrong?

Example:

dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
100.0
dmm.Temperature.set_FRTDResistance(108,1000) //Set resistance value Ro = 1k Ohm
dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
1000.0
dmm.Measure.RTDMeasure(108, Agilent34970RTDTypeEnum.Agilent34970RTD2Wire, Agilent34970RTDAlphaEnum.Agilent34970RTDAlpha85, Resolution)
{double[1]}
[0]: 9.9E+37
dmm.Temperature.get_FRTDResistance(108)
100.0

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stephen_mueller Nov 9, 2010 1:07 PM

Hello Marco-

The problem is with the RTDMeasure command. This command wipes out all the previous settings (including Ro) and makes the measurement with the default settings. Instead, you should use the Read command or an Initiate and Fetch command. This will make the measurement with all the previously defined settings, including RTD Ro, intact. You can refer to the Agilent 34970A IVI Drivers Help for more information on these commands.

Thanks,
Steve

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changmeikuan Nov 9, 2010 10:34 PM

Hi Marco,

My colleague has similar code which is working fine at his side so far. He'd modified a bit to your scenario as below:

dmm.ConfigureRTD(108, Agilent34970RTDTypeEnum.Agilent34970RTD2Wire, Agilent34970RTDAlphaEnum.Agilent34970RTDAlpha85, Resolution)

dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
100.0

dmm.Temperature.set_FRTDResistance(108,1000) //Set resistance value Ro = 1k Ohm

dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
1000.0

// take the measurement, using method that will return double array as Measure was doing
// Read both starts the measurement (Scan.Init) and gets the data (Scan.Fetch) in one step
Dmm.Scan.ReadNumbersOnly

// NOTE: If triggering had been BUS, or if user wanted to do other operations while measurement(s) are being taken, he would use sequence:
// Scan.Init; Scan.SendSoftwareTrigger; (or do other work while measurement is proceeding) then call Scan.FetchNumbersOnly to get the data

Hope this helps

-mk

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stephen_mueller Nov 9, 2010 1:07 PM
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Hello Marco-

The problem is with the RTDMeasure command. This command wipes out all the previous settings (including Ro) and makes the measurement with the default settings. Instead, you should use the Read command or an Initiate and Fetch command. This will make the measurement with all the previously defined settings, including RTD Ro, intact. You can refer to the Agilent 34970A IVI Drivers Help for more information on these commands.

Thanks,
Steve
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changmeikuan Nov 9, 2010 10:34 PM
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Hi Marco,

My colleague has similar code which is working fine at his side so far. He'd modified a bit to your scenario as below:

dmm.ConfigureRTD(108, Agilent34970RTDTypeEnum.Agilent34970RTD2Wire, Agilent34970RTDAlphaEnum.Agilent34970RTDAlpha85, Resolution)

dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
100.0

dmm.Temperature.set_FRTDResistance(108,1000) //Set resistance value Ro = 1k Ohm

dmm.Temperature.get_FRTDResistance(108) //Get resistance value Ro
1000.0

// take the measurement, using method that will return double array as Measure was doing
// Read both starts the measurement (Scan.Init) and gets the data (Scan.Fetch) in one step
Dmm.Scan.ReadNumbersOnly

// NOTE: If triggering had been BUS, or if user wanted to do other operations while measurement(s) are being taken, he would use sequence:
// Scan.Init; Scan.SendSoftwareTrigger; (or do other work while measurement is proceeding) then call Scan.FetchNumbersOnly to get the data

Hope this helps

-mk
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IVI Driver Error? Temperature measurement

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