Programming the DC Source - 7

There are two ways to make enhanced measurements:

♦Use the MEASure queries to immediately start acquiring new voltage or current data, and return measurement calculations from this data as soon as the buffer is full. This is the easiest way to make measurements, since it requires no explicit trigger programming. Additional calculations may be obtained from the acquired data using FETCh queries.

♦Use a triggered measurement when the measurement must be synchronized to a signal condition as discussed under “Triggering Measurements”. Then use the FETCh queries to return calculations from the data that was retrieved by the acquisition trigger. This method gives you the flexibility to synchronize the data acquisition with a transition in the output voltage or current. FETCh queries do not trigger the acquisition of new measurement data, but they can be used to return many different calculations from the data that was retrieved by the acquisition trigger. Note that if you acquired voltage data, you can fetch only voltage calculations.

NOTE: For each MEASure query, there exists a corresponding FETCh query. FETCh queries perform the same calculation as MEASure queries, but do not acquire new data.

Current Ranges and Measurement Detector

The dc source has two current measurement ranges. The command that controls the ranges is:

SENS:CURR:RANG MIN MAX

When the range is set to MIN, the maximum current that can be measured is 20 milliamperes. The crossover value of the high and low ranges is 20 milliamperes.

The dc source also has two measurement detectors. Check that the current detector is set to ACDC when measuring current pulses or other waveforms with a frequency content greater than a few kilohertz.

SENS:CURR:DET ACDC

Select DC as the measurement detector if you are making only DC current measurements and you require a measurement offset better than 2mA on the High current measurement range. Note that this selection gives inaccurate results on current waveforms that have ac content.

SENS:CURR:DET DC

RMS Measurements

To read the rms content of a voltage or current waveform, use:

MEAS:VOLT:ACDC? or

MEAS:CURR:ACDC?

This returns the ac+dc rms measurement.

Making rms or average measurements on ac waveforms for which a non-integral number of cycles of data has been acquired may result in measurement errors due to the last partial cycle of acquired data. The instrument reduces this error by using a Hanning window function when making the measurement. If the measurement readings vary from sample to sample, try increasing the data acquisition time to reduce measurement error.

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Agilent Technologies 66311B, 66309B, 66111A manual Current Ranges and Measurement Detector, RMS Measurements
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66111A, 66309B, 66311B, D specifications

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