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160 Multimeter Command Reference Chapter 3
:SOURce
TRIGger:SOURce <source> configures the trigger system to respond to the
specified source. The following sources are available:
• BUS: Group Execute Trigger (GET) bus command or *TRG common
command.
• EXT: The multimeter’s External Trigger BNC connector (triggers on the
negative or falling edge of the ±5V TTL input signal).
• IMMediate: The trigger system is always true.
• TTLTrg0 - TTLTrg7: Trigger source is VXIbus trigger line 0 through 7.
NOTE: B-size controllers do not support VXIbus TTL triggers (e.g.,
HP E1306A Command Module, HP E1300/E1301A B-Size Mainframes).
Parameters
Comments • The TRIGger:SOURce command only selects the trigger source. You must use
the
INITiate command to place the multimeter in the wait-for-trigger state.
(The
MEASure command automatically executes an INITiate command.)
• TRIGger:SOURce EXT uses the multimeter's front panel “Trig” BNC
connector as the trigger source. The multimeter triggers on the falling
(negative-going) edge of a ±5V TTL input signal; (maximum input is +5V to
the front panel BNC connector).
• TRIGger:IMMediate causes a trigger to occur immediately provided the
multimeter is placed in the wait-for-trigger state using
INITiate, READ? or
MEAS?.
• When a Group Execute Trigger (GET) bus command or *TRG common
command is executed and the multimeter is not in the wait-for-trigger state, the
“Trigger ignored” error is generated.
• The CONFigure and MEASure command subsystems automatically set the
trigger source to
TRIG:SOUR IMM.
• The READ? command cannot be used if the trigger source is
TRIG:SOUR BUS.
• Related Commands: INITiate, READ?, MEAS?
• *RST Condition: TRIG:SOUR IMM
Example Set the Sample Source
CONF:VOLT:DC
Function: DC voltage.
TRIG:SOUR EXT
Trigger source is external BNC on multimeter
front panel.
TRIG:COUN 10
Multimeter will accept 10 external triggers.
READ?
Place multimeter in wait-for-trigger state;
make measurements when external trigger is
received; send readings to output buffer.
enter statement
Enter readings into computer.
Parameter Name Parameter Type Range of Values Default Units
<source>
discrete BUS|EXT|IMMediate|
TTLTrg0 through TTLTrg7
none