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Configuring oscilloscope MSO9404A via IVI and MATLAB Instrument Driver

Question asked by GRoven on Apr 24, 2017
Latest reply on Apr 27, 2017 by algoss

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Hello.
I have a question about manipulating by oscilloscope MSO9404A from PC using Matlab and Infiniium Series Oscilloscopes IVI and MATLAB Instrument Drivers
http://www.keysight.com/main/software.jspx?ckey=1668582&lc=eng&cc=BY&nid=-32534.1150142&id=1668582
Particularly, it would be desirable to find out by what command I can switch trigger mode from "Auto" to "Triggered Mode" in the section "Trigger" and to set manually "Sample Rate" in the section "Acquisition" or to learn what algorithm is used for setting of sample rate with option "Auto".

Thanks in advance.

algoss

Apr 26, 2017 8:51 AM

Correct Answer

Hello,

I assume that you have looked through the Programming Manual before asking your questions:

' by what command I can switch trigger mode from "Auto" to "Triggered Mode" '

- :TRIGger:SWEep {AUTO | TRIGgered | SINGle}

' to set manually "Sample Rate" in the section "Acquisition" or to learn what algorithm is used for setting of sample rate with option "Auto"'

- :ACQuire:SRATe[:ANALog] {AUTO | MAX | <rate>}

- You should never use 'Auto' when programming the scope. You should always set you acquisition rate (SRATE), and depth (POINts), based on your needs. Auto is provided for GUI interaction with the scope, and it tells the scope to try to get the 'best' picture on the screen, while keeping the screen update rate high. If you start the scope running, and slowly turn the Horizontal knob, you will see that the depth increases for a while, keeping the sample rate high. At some point, the depth will stay fixed, and the sample rate will decrease. This increases the chance of aliasing, and other issues. I try to avoid using 'Auto' for either Sample rate or depth, even when I'm using the scope entirely through the GUI.

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JAbrams

Apr 24, 2017 8:10 PM

Hi -

Moving this thread to the Oscilloscopes forum for traction.

Thanks,

Jill

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algoss

Apr 26, 2017 8:51 AM

Hello,

I assume that you have looked through the Programming Manual before asking your questions:

' by what command I can switch trigger mode from "Auto" to "Triggered Mode" '

- :TRIGger:SWEep {AUTO | TRIGgered | SINGle}

' to set manually "Sample Rate" in the section "Acquisition" or to learn what algorithm is used for setting of sample rate with option "Auto"'

- :ACQuire:SRATe[:ANALog] {AUTO | MAX | <rate>}

2 people found this helpful

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GRoven Apr 26, 2017 12:21 PM

"I assume that you have looked through the Programming Manual before asking your questions"

You suggest to use the SCPI commands, but I meant use of IVI-COM Driver commands, for example

%%% start of example
myScope = instrument.driver.AgilentInfiniium();
resourceDesc = 'TCPIP0::<host_name or IP addr>::INSTR';

% ...

% Configure a trigger
myScope.DeviceSpecific.Trigger.Source = 'Channel1';
myScope.DeviceSpecific.Trigger.Level = 1.0;
myScope.DeviceSpecific.Trigger.Type = 'AgilentInfiniiumTriggerEdge';

% Configure an acquisition
myScope.DeviceSpecific.Acquisition2.SampleRateAutoEnabled = false;
myScope.DeviceSpecific.Acquisition2.Interpolation = 'AgilentInfiniiumInterpolationSineX';
myScope.DeviceSpecific.Acquisition2.Type = 'AgilentInfiniiumAcquisitionTypeNormal';
myScope.DeviceSpecific.Acquisition2.TimePerRecord = 4e-3;
myScope.DeviceSpecific.Acquisition2.NumberOfPointsMin = 1e6;
myScope.DeviceSpecific.Acquisition2.SampleRate = 250e6;
%%% end of example

But it seems that required commands are not realized in the driver, and, probably, it is necessary to use them in SCPI version.
Thanks for answer, algoss

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algoss

@ GRoven on Apr 27, 2017 6:27 AM

I'm sorry, but I only use SCPI. I've never quite seen the need for IVI, unless you're trying to write one piece of code that might try to support equivalent equipment from different manufacturers.

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4 Replies

JAbrams Apr 24, 2017 8:10 PM
Mark Correct
Correct Answer
Hi -
Moving this thread to the Oscilloscopes forum for traction.
Thanks,
Jill
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algoss Apr 26, 2017 8:51 AM
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Correct Answer
Hello,

I assume that you have looked through the Programming Manual before asking your questions:

' by what command I can switch trigger mode from "Auto" to "Triggered Mode" '
- :TRIGger:SWEep {AUTO | TRIGgered | SINGle}

' to set manually "Sample Rate" in the section "Acquisition" or to learn what algorithm is used for setting of sample rate with option "Auto"'
- :ACQuire:SRATe[:ANALog] {AUTO | MAX | <rate>}
- You should never use 'Auto' when programming the scope. You should always set you acquisition rate (SRATE), and depth (POINts), based on your needs. Auto is provided for GUI interaction with the scope, and it tells the scope to try to get the 'best' picture on the screen, while keeping the screen update rate high. If you start the scope running, and slowly turn the Horizontal knob, you will see that the depth increases for a while, keeping the sample rate high. At some point, the depth will stay fixed, and the sample rate will decrease. This increases the chance of aliasing, and other issues. I try to avoid using 'Auto' for either Sample rate or depth, even when I'm using the scope entirely through the GUI.

Al
2 people found this helpful
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GRoven Apr 26, 2017 12:21 PM
Mark Correct
Correct Answer

"I assume that you have looked through the Programming Manual before asking your questions"
You suggest to use the SCPI commands, but I meant use of IVI-COM Driver commands, for example
%%% start of example
myScope = instrument.driver.AgilentInfiniium();
resourceDesc = 'TCPIP0::<host_name or IP addr>::INSTR';
% ...
% Configure a trigger
myScope.DeviceSpecific.Trigger.Source = 'Channel1';
myScope.DeviceSpecific.Trigger.Level = 1.0;
myScope.DeviceSpecific.Trigger.Type = 'AgilentInfiniiumTriggerEdge';
% Configure an acquisition
myScope.DeviceSpecific.Acquisition2.SampleRateAutoEnabled = false;
myScope.DeviceSpecific.Acquisition2.Interpolation = 'AgilentInfiniiumInterpolationSineX';
myScope.DeviceSpecific.Acquisition2.Type = 'AgilentInfiniiumAcquisitionTypeNormal';
myScope.DeviceSpecific.Acquisition2.TimePerRecord = 4e-3;
myScope.DeviceSpecific.Acquisition2.NumberOfPointsMin = 1e6;
myScope.DeviceSpecific.Acquisition2.SampleRate = 250e6;
%%% end of example

But it seems that required commands are not realized in the driver, and, probably, it is necessary to use them in SCPI version.
Thanks for answer, algoss
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- algoss @ GRoven on Apr 27, 2017 6:27 AM
  Mark Correct
  Correct Answer
  I'm sorry, but I only use SCPI. I've never quite seen the need for IVI, unless you're trying to write one piece of code that might try to support equivalent equipment from different manufacturers.
  Like • Show 0 Likes0
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Configuring oscilloscope MSO9404A via IVI and MATLAB Instrument Driver

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