2400 Series SourceMeter
®
User’s Manual Triggering 11-33
Idle
As with DC Mode front panel operation, the SourceMeter is taken out of idle by pressing
the ON/OFF OUTPUT key.
For DC Mode remote operation, the output must be on and then an initiate command must
be sent to take the instrument out of idle. For Pulse Mode remote operation, the output is
turned on and initiation is satisfied when :INITiate, :READ? or :OUTPut[1][:STATe] ON
is sent.
Source event detector
For the DC Mode, three event detectors are used for the trigger layer. For the Pulse Mode,
only the Source Event Detector is used. Note that since the Delay Event Detector is not
used, source delay is not used.
Pulse delay
Instead of a Trigger Delay used in the DC Mode, the Pulse Mode uses a Pulse Delay. This
delay is set by the user and is part of the pulse off-time.
After event detection, operation proceeds to the Pulse Delay. However, for the initial pass
through the trigger model, the Pulse Delay is bypassed as shown in Figure 11-13. This ini-
tial loop around the delay allows the pulse to be sourced as soon as the output is turned on.
Source action
The source action turns on the output to source the pulse.
Pulse width
The pulse-width is the time duration that the output is on. Depending on how the
SourceMeter is configured, the pulse width can be as short as 0.2msec or as long as 5msec.
In general, the pulse width is made up of a delay and the signal measurement. See
Section 5 for details on pulse width timing.
Measure action
With Auto Zero enabled, a reading consists of three measurements; signal, reference and
zero. These three measurements are then used to calculate an accurate pulse reading. The
signal is measured first while the output is on. After the signal measurement is completed,
the output turns off, and the reference and zero measurements are performed.
With Auto Zero disabled, the reference and zero measurements are not performed. This
allows a faster pulse train by shortening the output off-time. Note however, that zero drift
will eventually result in inaccurate readings.
For the DC Mode, the filtering process is part of the Measure Action. In the Pulse Mode,
filtering is not used.
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