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HP E1312A/E1412A Multimeter Application Information 55Chapter 2
• Trigger source (TRIG:SOUR) is set for an external trigger. A trigger
count (
TRIG:COUN) of 3 is set; the multimeter will accept three
external triggers.
• The sample count (SAMP:COUN) is set for 10 samples per trigger.
• The INITiate command puts the multimeter in the wait-for-trigger state.
The trigger source is an “
EXTernal” hardware trigger. You provide this
trigger and input it on the “Ext Trig” BNC connector which initiates
the measurement process. This will cause the multimeter to make
30 measurements; 10 samples for each of three triggers.
• The FETCh? command causes the readings to be transferred to the
output buffer and you must provide the I/O construct to retrieve the
readings and enter them into the computer.
MEASURE3
Source Code File
Maximizing Measurement Speed (no trigger delay, short integration time)
*RST
Reset the multimeter.
CONF:VOLT:DC 18
Configure for dc volts, expected input = 18V.
CAL:ZERO:AUTO OFF
Turn off autozero (makes faster measurements).
TRIG:SOUR IMM
Set the trigger source to immediate.
TRIG:COUN 3
Set trigger count to 3.
SAMP:COUN 10
Set sample count to 10.
INIT
INITiate command puts multimeter in
wait-for-trigger state; internal trigger immediately
occurs here and measurements are stored in the
multimeter’s internal memory.
FETC?
Transfer measurements from the multimeter’s
internal memory to the output buffer and retrieve
them with the computer.
enter statement
Enter reading into computer.
Comments • The CONFigure command configures the multimeter for the function
specified. This
CONFigure command specifies a range parameter of
18 (expected input is 18V; the multimeter sets a range to
accommodate that input which will be 100V). It does not initiate the
measurement.
• The autozero function is disabled to speed up the measurement
process. See the
CALibrate:ZERO:AUTO command in the Command
Reference for more information.
• Trigger source (TRIG:SOUR) is set for immediate internal triggers.
A trigger count (
TRIG:COUN) of 3 is set; the multimeter will accept
three triggers.
• The sample count (SAMP:COUN) is set for 10 samples per trigger.
• The INITiate command puts the multimeter in the wait-for-trigger
state. The trigger source is “
IMMediate” which specifies the internal
trigger source. This trigger occurs immediately and causes the
measurement process to begin. This will cause the multimeter to make
30 measurements; 10 samples for each of three internal triggers.
• The FETCh? command causes the readings to be transferred to the
output buffer and you must provide the I/O construct to retrieve the
readings and enter them into the computer.