HP WaterSkis E1312A, WaterSkis E1412A manual MEASURE4 Source Code File

MEASURE4 Source Code File

Maximizing Accuracy (most accurate resolution, longer integration time)

*RST

CONF:VOLT:DC AUTO,MIN

TRIG:SOUR EXT

TRIG:COUN 2

SAMP:COUN 10

READ?

enter statement

Reset the multimeter.

Configure for dc volts, autorange, minimum resolution (longest integration time).

Set trigger source to external. Set trigger count to 2.

Set sample count to 10.

Initiate measurements putting them directly into output buffer; retrieve them with the computer.

Enter reading into computer.

Comments • The CONFigure command configures the multimeter for the function specified. This CONFigure command specifies autorange and minimum resolution (the smallest resolution value which is the best resolution). It does not initiate the measurement.

•Specifying a small value for resolution provides the most accurate measurements. This will increase the integration time (NPLCs) and therefore require more time for the measurements.

•Trigger source (TRIG:SOUR) is set for an external trigger. A trigger count (TRIG:COUN) of 2 is set; the multimeter will accept two external triggers.

•The sample count (SAMP:COUN) is set for 10 samples per external trigger.

•The READ? command puts the multimeter in the wait-for-trigger state. When the first external trigger is received, the measurement process begins. This will cause the multimeter to make 10 measurements for the first external trigger, go to the wait-for-trigger state and take 10 measurements for the second external trigger when received.

•The readings are stored in the output buffer and you must provide the I/O construct to retrieve the readings and enter them into the computer.

•This example uses the READ? command. Measurements are initiated with the READ? command which puts the multimeter in the wait-for- trigger state. Measurement occurs when the trigger arrives and readings are subsequently stored directly in the output buffer and must be retrieved by the computer with an I/O construct you supply. An alternative way of initiating measurements is to use the INITiate command as done in the previous example. Measurements are made and stored in the multimeter’s internal memory and must be retrieved using the FETCh? command which transfers the readings to the output buffer. You must be careful when using the INITiate and FETCh? commands. Internal memory stores a maximum of 512 readings; the oldest readings exceeding 512 are lost.

56 HP E1312A/E1412A Multimeter Application Information Chapter 2