6243/44 DC Voltage Current Source/Monitor Operation Manual
4.11 External Control Signals
4-53
Note the following precautions.
• Do not input the TRIGGER IN signal in the Standby status.
• Ensure that the TRIGGER IN signal, the trigger from the TRIGGER key, and GPIB trigger (*TRG)
do not overlap.
• The minimum repeat time of the TRIGGER IN signal is shown below. Signals repeated faster than this
may be ignored and may cause irregularities in measurement or voltage source.
Minimum repeat time:
Conditions: Source range: Fixed range
Measurement range: Fixed. Trigger Mode: External trigger. Measurement digits:5-
1/2 digits. Integration time: 500 s. Measure Delay: 0.3 ms. Source Delay: 10 s.
Period: 2 ms. Pulse Width: 1 ms
• TRIGGER IN signal dependant sweep start may take place with approximately 400 s jitter and
approximately 3.5 ms delay because of the time required for internal processing of the start source.
• The SYNC OUT signal is not output in the DC source mode.
• The BUSY IN signal is detected upon completion of measurement and period, and if it is LO level, the
next measurement does not start.
• Use the BUSY IN signal in synch with the operation of the 6243/44.
Operation is not guaranteed if it is input asynchronously with no relation to the operation of the 6243/44.
• When the BUSY IN signal is LO level, do not input the trigger (*TRG) from the TRIGGER key or
GPIB. Operation is not ensured in this case.
OPERATE
SIGNAL
OUT
*2
Output
TTL
Negative
level
Approx.100
(+5 V pulled up
with 10 k)
The signal is LO during Operate.
The signal is HI during Standby.
For *1 and *2, the same terminals are used by switching.
*3 becomes approximately 100 to 200
s when the output pulse width of the external control signal is set to 100
s.
Measurement Memory mode Minimum repeat time
OFF - 2.5 ms
ON BURST 5 ms
NORMAL 10 ms
OFF
Table 4-16 External Control Signal Functions (2 of 2)
Signal
Input/
Output
Level Impedance Function
WARNING: The 6243
When the output is set to OPERATE by using the GPIB command or the OPERATE IN/OUT
signal, hazardous voltage is output depending on the setting.
Be careful of electric shocks.
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