Programming Examples - 4

INSTrument:NSELect 1

FETCh:VOLTage:AC?

INSTrument:NSELect 2

FETCh:VOLTage:AC?

INSTrument:NSELect 3

FETCh:VOLTage:AC?

Returning Voltage and Current Data From the Data Buffer

The MEASure and FETch queries can also return all 4096 data values of the instantaneous voltage and current buffers. These are:

MEASure:ARRay:CURRent?

MEASure:ARRay:VOLTage?

Regulatory-Compliant Measurement of Quasi-Stationary Harmonics

In order to meet regulatory requirements of IEC-555 and other standards that specify how quasi-stationary harmonics are to be measured, the ac source has a command that alters both the output frequency control and the harmonic measurement algorithms to meet these requirements. The command is

SENSe:WINDow KBESsel RECTangular

Triggering Measurements

You can use the data acquisition trigger system to synchronize the timing of the voltage and current data acquisition with an external trigger source. Then use the FETCh commands to return different calculations from the data acquired by the measurement trigger.The following measurement trigger sources can be selected:

BUS

selects GPIB bus triggers.

EXTernal

selects the external Trigger In BNC connector.

TTLTrg

selects the signal driving the Trigger Out BNC connector.

SCPI Triggering Nomenclature

As previously explained under "Triggering Output Changes", the ac source uses the following sequence name and alias for the measurement trigger system. This alias can be used instead of the sequence form.

Sequence Form

Alias

SEQuence3

ACQuire

Measurement Trigger System Model

Figure 4-2 is a model of the measurement trigger system. The rectangular boxes represent states. The arrows show the transitions between states. These are labeled with the input or event that causes the transition to occur.

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Agilent Technologies 6814B, 6834B, 6843A Triggering Measurements, Returning Voltage and Current Data From the Data Buffer
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6812B, 6811B, 6813B, 6834B, 6843A specifications

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