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Voltage measurement on Agilent N6700B

Question asked by Hagai on Mar 16, 2011
Latest reply on Mar 31, 2011 by Hagai

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Hi,
I'm writing this VC++ API to automate the N6700B.

I connect to the instrument through LAN.

I managed to change the voltage on a given unit (1-4), as I can see the change in the panel and the web App.
but when I measure it I get weird results.
Here's a sample of my code, setting the output voltage on unit-1 and then reading it:

IAgilentN67xx4Ptr m_agDriverPtr;
IAgilentN67xxOutput3Ptr outputPtr = m_agDriverPtr->Outputs->GetItem("Output1");
outputPtr->VoltageLevel(1.0,1.11);
AgilentN67xxMeasurementPtr measPtr = m_agDriverPtr->Measurements->GetItem("Measurement1");
double mpo_voltage = measPtr->Measure(AgilentN67xxMeasurementVoltage);
printf("output voltage on unit1 is = %f ",mpo_voltage);

The value printed as mpo_voltage is 0.000609, and it changes after each execute (sometimes can be read negative).

What am I doing wrong?

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MattC

Mar 22, 2011 2:39 PM

Hi,

Where are you enabling the power supply? It does not look like an output enable command is there.

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Hagai Mar 23, 2011 3:55 AM

Hi, I didn't supply the full code.
Here it is:

CoInitialize(NULL);
IAgilentN67xx4Ptr m_agDriverPtr;
m_agDriverPtr.CreateInstance(__uuidof(AgilentN67xx));
m_agDriverPtr->Initialize(
          OLESTR(mp_Visa),
          mp_idQuery,
          mp_reset,
          LPCTSTR("Cache=true, InterchangeCheck=false, QueryInstrStatus=true, Simulate=false"));

IAgilentN67xxOutput3Ptr outputPtr = m_agDriverPtr->Outputs->GetItem("Output1");
outputPtr->VoltageLevel(1.0,1.11);
AgilentN67xxMeasurementPtr measPtr = m_agDriverPtr->Measurements->GetItem("Measurement1");
double mpo_voltage = measPtr->Measure(AgilentN67xxMeasurementVoltage);
printf("output voltage on unit1 is = %f ",mpo_voltage);

mp_Visa contains my VISA address to connect the PS.
As I mentioned, setting the voltage works, as I can see the change in the monitor.
The problem is when I read the voltage.

Any idea?

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MattC

Mar 29, 2011 10:22 AM

Hi,

Can you send a copy of your program to spd_support@agilent.com. I will see what I can see when I run it.

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Hagai Mar 31, 2011 1:25 AM

Sent.

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4 Replies

MattC Mar 22, 2011 2:39 PM
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Correct Answer
Hi,

Where are you enabling the power supply? It does not look like an output enable command is there.
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Hagai Mar 23, 2011 3:55 AM
Mark Correct
Correct Answer
Hi, I didn't supply the full code.
Here it is:

CoInitialize(NULL);
IAgilentN67xx4Ptr m_agDriverPtr;
m_agDriverPtr.CreateInstance(__uuidof(AgilentN67xx));
m_agDriverPtr->Initialize(
          OLESTR(mp_Visa),
          mp_idQuery,
          mp_reset,
          LPCTSTR("Cache=true, InterchangeCheck=false, QueryInstrStatus=true, Simulate=false"));

IAgilentN67xxOutput3Ptr outputPtr = m_agDriverPtr->Outputs->GetItem("Output1");
outputPtr->VoltageLevel(1.0,1.11);
AgilentN67xxMeasurementPtr measPtr = m_agDriverPtr->Measurements->GetItem("Measurement1");
double mpo_voltage = measPtr->Measure(AgilentN67xxMeasurementVoltage);
printf("output voltage on unit1 is = %f ",mpo_voltage);

mp_Visa contains my VISA address to connect the PS.
As I mentioned, setting the voltage works, as I can see the change in the monitor.
The problem is when I read the voltage.

Any idea?
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MattC Mar 29, 2011 10:22 AM
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Correct Answer
Hi,

Can you send a copy of your program to spd_support@agilent.com. I will see what I can see when I run it.
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Hagai Mar 31, 2011 1:25 AM
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Sent.
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Voltage measurement on Agilent N6700B

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