TRIGger Subsystem

The TRIGger subsystem configures the triggering that controls measurement acquisition.

Note

Recommendation: All triggered measurements should be made using an appropriate fixed manual range. That is, turn autorange off ([SENSe:]<function>:RANGe:AUTO OFF) or set a fixed range using the [SENSe:]<function>:RANGe, CONFigure, or MEASure command.

Command Summary

TRIGger:COUNt

TRIGger:DELay

TRIGger:DELay:AUTO

TRIGger:LEVel

TRIGger:SLOPe

TRIGger:SOURce

TRIGger:COUNt {<count>|MIN|MAX|DEF|INFinity}
TRIGger:COUNt? [{MIN|MAX|DEF}]

Selects the number of triggers that are accepted by the instrument before returning to the "idle" trigger state.

Parameter Typical Return

1 to 1,000,000 (1x106) or continuous (INFinity). Default: 1. (34460A/61A)
1 to 1,000,000,000 (1x109) or continuous (INFinity). Default: 1. (34465A/70A)

+1.00000000E+00

For a continuous trigger (INFinity), the query returns "9.9E37".

Return ten sets of five DC voltage measurements, using a positive-going external trigger to start each measurement set:

CONF:VOLT:DC
SAMP:COUN 5
TRIG:COUN 10
TRIG:SOUR EXT;SLOP POS
READ?

Typical Response: +1.00520000E+01, … (50 measurements)

TRIGger:DELay {<seconds>|MIN|MAX|DEF}
TRIGger:DELay? [{MIN|MAX|DEF}]

Sets the delay between the trigger signal and the first measurement. This may be useful in applications where you want to allow the input to settle before taking a measurement or for pacing a burst of measurements.

Selecting a specific trigger delay disables the automatic trigger delay (TRIGger:DELay:AUTO OFF).

Note

For AC measurements (voltage or current), there is a relationship between the bandwidth setting ([SENSe:]VOLTage:AC:BANDwidth or [SENSe:]CURRent:AC:BANDwidth) and the default trigger delay setting. This delay ensures that there is sufficient settling time for the AC measurement. See Automatic Trigger Delays for further information.


Parameter Typical Return
0 to ~3600 seconds (~1 µs steps). Default: 1 s.

Step size for DC measurements is approximately 1 µs.
Step size depends on AC bandwidth for AC measurements.

+2.00000806E+00

Return five DC voltage measurements. There is a 2 second delay before each measurement.

CONF:VOLT:DC 10
SAMP:COUN 5
TRIG:DEL 2
READ?

Typical Response: +4.27230000E+00,+4.27150000E+00,+4.27190000E+00,+4.27170000E+00,+4.27200000E+00

TRIGger:DELay:AUTO {ON|1|OFF|0}
TRIGger:DELay:AUTO?

Disables or enables automatic trigger delay. If enabled, the instrument determines the delay based on function, range, and integration time or bandwidth.

Parameter Typical Return
{ON|1|OFF|0}. Default: ON. 0 (OFF) or 1 (ON)

Return 5 DC voltage measurements, with an automatic delay between each measurement.

CONF:VOLT:DC 10
SAMP:COUN 5
TRIG:DEL 2
READ?

Typical Response: +4.27230000E+00,+4.27150000E+00,+4.27190000E+00,+4.27170000E+00,+4.27200000E+00

TRIGger:LEVel {<level>|MIN|MAX|DEF}
TRIGger:LEVel? [{MIN|MAX|DEF}]

Sets the level on which a trigger occurs when level triggering is enabled (TRIGger:SOURce set to INTernal).

It is recommended that all triggered measurements be made using an appropriate fixed manual range. That is, turn autorange off (SENSe:<function>:RANGe:AUTO OFF), or set a fixed range using the SENSe:<function>:RANGe, CONFigure, or MEASure command.

Parameter Typical Return

<level> (see bullet points below). Default: 0.

+2.00000000E+01

Configures dc voltage measurements, 1 V range, 0.1 mV resolution. Select internal trigger source. Set the trigger level to 0.75 volts, positive slope. INIT puts the instrument in the "wait for trigger" mode.

CONF:VOLT:DC 1,0.0001
TRIG:SOUR INT
TRIG:LEV 0.75
TRIG:SLOP POS
INIT

Measurement Function Range/Input Terminals

<level> Parameter Value

DCV

100 mV to 100 V ranges, fixed range

±120% of range
1000 V range, fixed range ±1000 V

Autorange

±1000 V

DCI

3 A terminals, fixed range

±120% of range
3 A terminals, autorange ±3.6 A
10 A terminals ±12 A
RESistance/FRESistance All ranges, fixed range 0 to +120% of range
Autorange 0 to +1.2 GΩ
ACV 100 mV to 100 V ranges, fixed range 0 to +120% of range
750 V range, fixed range 0 to +1000 V
Autorange 0 to +1000 V
ACI 3 A terminals, fixed range 0 to +120% of range
3 A terminals, autorange 0 to +3.6 A
10 A terminals 0 to +12 A

FREQuency

*N/A 3 Hz to 300 kHz
PERiod *N/A 3.33333333 µs to 0.333333333 s

*N/A = Not Applicable.

See Also

TRIGger:DELay

TRIGger:SOURce

TRIGger:SLOPe {POSitive|NEGative}
TRIGger:SLOPe?

Selects whether the instrument uses the rising edge (POS) or the falling edge (NEG) of the trigger signal on the rear-panel Ext Trig BNC connector when external triggering is selected; or the rising or falling edge of the input signal when level triggering is selected (level triggering applies only to the 34465A and 34470A).

Parameter Typical Return
{POSitive|NEGative}. Default: NEG POS or NEG
Return ten sets of five DC voltage measurements, using a positive-going external trigger to start each measurement set:

CONF:VOLT:DC
SAMP:COUN 5
TRIG:COUN 10
TRIG:SOUR EXT;SLOP POS
READ?

Typical Response: +1.00520000E+01, … (50 measurements)

TRIGger:SOURce {IMMediate|EXTernal|BUS|INTernal}
TRIGger:SOURce?

Selects the trigger source for measurements.

It is recommended that all triggered measurements be made using an appropriate fixed manual range. That is, turn autorange off (SENSe:<function>:RANGe:AUTO OFF), or set a fixed range using the SENSe:<function>:RANGe, CONFigure, or MEASure command.

Source Description
IMMediate The trigger signal is always present. When you place the instrument in the "wait-for-trigger" state, the trigger is issued immediately.
BUS The instrument is triggered by *TRG over the remote interface once the DMM is in the "wait-for-trigger" state.
EXTernal The instrument accepts hardware triggers applied to the rear-panel Ext Trig input and takes the specified number of measurements (SAMPle:COUNt), each time a TTL pulse specified by OUTPut:TRIGger:SLOPe is received. If the instrument receives an external trigger before it is ready, it buffers one trigger.
INTernal The INTernal source is available for the 34465A and 34470A with the DIG option only, and provides level triggering capability. To trigger on a level on the input signal, select INTernal for the source, and set the level and slope with the TRIGger:LEVel and TRIGger:SLOPe commands.

Parameter Typical Return
{IMMediate|EXTernal|BUS|INTernal}. Default: IMMediate. IMM, EXT, or BUS
Return ten sets of five DC voltage measurements, using a positive-going external trigger to start each measurement set:

CONF:VOLT:DC
SAMP:COUN 5
TRIG:COUN 10
TRIG:SOUR EXT;SLOP POS
READ?

Typical Response: +1.00520000E+01, … (50 measurements)