Keithley 6221 User Manual

Model 6220/6221 Reference Manual Triggering 8-11
Return to Section 8 topics
1. INIT ‘ Initiate one trigger cycle
This command is used to initiate one trigger cycle and take the unit out of the
idle state.
2. ABOR ‘ Reset trigger system
This command resets the trigger system. If a sweep is in progress, it will be
halted and the source value set to zero. The operate state, however, will be
left on. The sweep is still armed, and can be started again with another INIT
command (i.e., - no re-arming is needed).
3. ARM:SOUR <name> ‘ Select ARM layer control source.
This command selects the ARM layer event detector control source:
IMMediate, TIMer, BUS, TLINk, NSTest, PSTest, BSTest, or MANual.
4. ARM:SIGN ‘ Bypass ARM layer control source.
This command is used to bypass the ARM layer control source and move on
to the next layer in the trigger model (the TRIGger layer event detection in this
case).
5. ARM:TIM <n> ‘ Set ARM layer timer interval.
This command selects the ARM layer timer interval in the range of 0 to
99999.99 sec. with 1 msec resolution.
6. ARM:DIR <name> ‘ Set ARM source bypass.
This command enables (SOURce) or disables (ACCeptor) the ARM source
bypass.
7. ARM:ILIN <NRf> ‘ Set ARM layer trigger input line.
This command selects the ARM layer input signal line: 1, 2, 3, 4, 5, or 6.
8. ARM:OLIN <NRf> ‘ Set ARM layer trigger output line.
This command selects the ARM layer input signal line: 1, 2, 3, 4, 5, or 6. Note
that for the Model 6221 only, the trigger output line and phase marker
(SOUR:WAVE:PMAR:OLIN) lines cannot be the same, or a -221 Settings
Conflict error will occur. (See “Phase marker,” on page 7-9.).
9. ARM:OUTP <name> ‘ Select when to output ARM trigger.
This command selects when to output the ARM layer trigger. Available selec-
tions include TEXit (output when exiting trigger layer), TENTer (output when
entering trigger layer), or NONE (disabled).
10. TRIG:SOUR <name> ‘ Select TRIG layer control source.
This command selects the TRIG layer event detector control source:
IMMediate and TLINk.
11. TRIG:SIGN ‘ Bypass TRIG layer control source.
This command is used to bypass the TRIGger layer control source and move
on to the next layer in the trigger model (the device action block in this case).
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Keithley 6221 Specifications

General

Interface	GPIB, RS-232
Communication Interface	GPIB, RS-232
Current Sourcing Accuracy	±(0.03% of output + 20 pA)
Current Sinking Accuracy	±(0.03% of output + 20 pA)
Output Resolution	100 fA
Output Accuracy	±(0.03% of output + 20 pA)
Power Requirements	100 V to 240 V AC, 50/60 Hz