8-18 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 8: Triggering Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
If you want to repeat the sweep three times, set the arm counter to three (ARM:COUNt 3). Three
10-point sweeps will then be performed (a total of 30 source-delay-measure actions).
The maximum buffer size for the Model 6482 is 3000 readings. The product of the finite values of
the two counters cannot exceed 3000. For example, if you set an arm count of two, the maximum
trigger count will be 3000 (3000 / 2 = 1500). However, you can set the arm count to infinite (INF).
With an infinite arm count, the maximum trigger count is 3000.
NOTE With front-panel operation only, when a sweep is configured, the trigger model settings
will not change until the sweep is started. After the sweep is finished, the trigger model
will reset to the previous settings.
Output triggers
The Model 6482 can be programmed to output a trigger (using the rear panel trigger link
connector) after various trigger model operations. An output trigger is used to trigger another
instrument to perform an operation. See “Trigger link,” page Section 8-6, for more information.
Trigger layer output triggers: The Model 6482 can be programmed to output a trigger after each
action of the SDM cycle (source, delay, and measure). Output triggers are controlled with the
TRIGger:OUTPut command. For example, to output a trigger after the measure action, the
following command must be sent:
TRIGger:OUTPut SENSe
The above command disables output triggers for the source and delay actions because their
parameter names (SOURce and DELay) are not included in the parameter list. When used with a
scanner, an output trigger after each measurement can signal the scanner to select the next
channel in the scan.
Arm layer output trigger: As shown in Figure 8-9, the Model 6482 can be programmed to output
a trigger when operation leaves the arm layer and enters the trigger layer. This output trigger is
typically sent to another instrument to signal the end of a scan or sweep. The ARM:OUTPut
command is used to control this output trigger. The TRIGger parameter enables the trigger when
the trigger layer is exited, and the NONE parameter disables the output trigger.
GPIB defaults
The GPIB defaults are listed as follows. They are also denoted in Figure 8-9 by the “+” symbol.
• Arm-In Event = Immediate
• Trigger-In Source = Immediate
• Arm Count = 1
• Trigger Count = 1
• Trigger Delay = 0.0 seconds
• Delay Action = 0.001 seconds
• Enabled event detector = Source event detector (delay and measure detection disabled)
• Enabled output triggers = None
• Event detection bypasses = Acceptor (both layers)
With output turned ON (OUTPut1 ON or OUTPut2 ON), the Model 6482 will perform one SDM
cycle when the INITiate command is sent. After the measurement, the Model 6482 returns to the
idle state.
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