10-6 Triggering Models 2500 and 2502 User’s Manual
Counters
Programmable counters are used to repeat operations within the trigger model layers. For
example, if performing a 10-point sweep, the trigger counter would be set to 10. Operation
will stay in the Trigger Layer until the 10 source-delay-measure points of the sweep are
performed.
If you wanted to repeat the sweep three times, the arm counter would be set to three. Three
10-point sweeps can then be performed for a total of 30 source-delay-measure actions.
The maximum buffer size for the Model 2500 is 3000 readings. The product of the two
counter values cannot exceed 3000. For example, if you set an arm count of two, the max-
imum trigger count will be 1500 (3000 / 2 = 1500). However, you can set the arm count to
INFINITE. With an infinite arm count, the maximum trigger count is 3000.
NOTE 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 2500 can be programmed to output a trigger (via rear panel Trigger Link con-
nector) after various trigger model operations. An output trigger is used to trigger another
instrument to perform an operation. See “Trigger link,” page 10-8, for more information.
Trigger Layer Output Triggers — After each action (Source, Delay, and Measure), the
Model 2500 can be programmed to send out an output trigger if Trigger Link is the
selected Trigger-In Source. For example, if the Trigger Out Event for Measure is ON, an
output trigger will be sent after the Measure action. 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 — The Model 2500 can also be programmed to output a trig-
ger when operation leaves the Trigger Layer and enters into the Arm Layer. This output
trigger is typically sent to another instrument to signal the end of a scan or sweep.
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