Triggermodeo - Keithley 595 Instruction Manual

IEEE-488 PROGRAMMING
4.9.19 Trigger Mode (T)
Purpose
Format
Parameters
Description
Default
Example
The trigger mode defines the conditions which wiIl triwr a reading.
Tn
n =
0 Continuous
on
Talk
n = 1 One-shot on Wk
n
= 2
Continuous on GET
n = 3 One-shot on GET
n = 4 continuous on x
n = 5 One-shot on X
n = 6 Continuous on External Trigger
n = 7 One-shot on External Trigger
When set to conlinuous trigger, a single trigger conman d is used to start a continuous
series of~readings. In a one-shot trigger, a separatetrigger sthnulus is required to
start each conversion (reading).
Triggers are paired according to the type of~stinwks that is used to trigger the in-
strument. Talk is when the Model 595 is addressed to talk. GET is the IEEE488 Grouping
Execute Trigger. "X" is the Kgithley execute command. External trigger is the rear
panel BNC conn&tion (a falling edge 'ITL level is required).
Notes that when a trigger command (Tn) is sent, the instrument will stop making
measurements and display the "triG" message. Measurements will continue when
the required trigger occurs. When set for a s+rcase output, the voltage source out-
put will switch to DC and display the "triG" message when a triaer command is
sent. To continue the staircase, first set the voltage source to output the staircase
(W3) and then apply the required trigger.
Upon power up or after the instrument receives a DCL or SDC comman d, the Model
595 wjll return to T6 and supply its own trigger to start.
From the front panel, set up the parameters for a staircase capacitance measurement,
leaving the Model 595's waveform at DC. Enter the following statements into the
computer to demons&ate a one-shot tripger:
When the END LINE key is pressed the second time, the staircase will start and
capacitance readings will be displayed. When END LINE is pressed the third time,
the instmment will be placed in the one-shot on GET trigger mode, the voltage souxe~
switches to a DC output (staircase stops) and the "t&Z" message is displayed. When
END LINE is pressed the fourth time, the voltage source is set to output a staircase.
When~END LINE is pressed the last time one reading will be tr&exvd and displayed.
For another example, substitute Dl for DO and later T2 for TJ.
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