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54 HP E1312A/E1412A Multimeter Application Information Chapter 2
The measurement process restarts when there is again room to store readings
in the output buffer.
Measurement Format Readings in the output buffer have the following characteristics:
• Readings sent to the output buffer can consist of two different lengths
(bytes or characters) in Real ASCII format:
±
1.23456E
±
12
LF
or
±
1.234567E
±
12
LF
• Each measurement is terminated with a Line Feed (LF). The HP-IB
End-or-Identify (EOI) signal is sent with the last byte transferred. If
multiple measurements are returned, the measurements are separated
by commas and EOI is sent only with the last byte. For example:
±
1.23456E
±
12
LF
,
±
1.234567E
±
12
LF
,
±
1.23456E
±
12
LF EOI
• The multimeter’s internal memory stores 512 readings maximum.
MEASURE1
Source Code File
Use the MEAS Command to Make a Single Measurement
*RST
Reset the multimeter.
MEAS:VOLT:DC?
Configure dc volts (default settings) and measure
retrieve the reading from the multimeter.
enter statement
Enter reading into computer
Comments • The MEASure command configures the multimeter for the function
specified and initiates the measurement. The reading is stored in the
output buffer and you must provide the I/O construct to retrieve the
reading and enter it into the computer.
MEASURE2
Source Code File
Making Externally Triggered Measurements (multiple triggers/samples)
*RST
Reset the multimeter.
CONF:VOLT:DC 18
Configure for dc volts, expected input = 18V.
TRIG:SOUR EXT
Set trigger source to external.
TRIG:COUN 3
Set trigger count to 3.
SAMP:COUN 10
Set sample count to 10 per trigger.
INIT
Puts multimeter in wait-for-trigger state. EXTernal
triggers occur here to initiate measurements.
Measurements are stored in multimeter internal
memory.
FETC?
Transfer measurements from the multimeter internal
memory to the output buffer and retrieve them with
the computer.
enter statement
Enter reading into computer.
Comments • You must provide a TTL external trigger signal to the HP E1312A or
HP E1412A front panel “Trig” input BNC. Measurements are triggered
by low pulses of this signal. Each trigger results in 10 readings.
• 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.