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8842A
Instruction Manual
1-10
EXTERNAL TRIGGER TIMING CHARACTERISTICS
The following diagram shows the nominal timing for the various processes which take place between an
external trigger and data sent out on the IEEE-488 interface. Delays will vary if a second trigger comes
before the data handshake is complete.
t1-1.wmf
NOTES: 1. Time for single trigger to start of A/D conversion.(See “Automatic Settling Time
Delay” on previous page.) If the delay is disabled by using the T3 or T4 command,
then the delay is 1 ms±150 µs. When the 8842A is triggered with an IEEE-488
command (GET or ?), the automatic settling time delay begins after the trigger
command has been processed and recognized.
2. A/D conversion time is dependent on the reading rate and power-line frequency:
A/D CONVERSION TIME (ms)
RATE
50 Hz 60 Hz 400 Hz
S 472 (3800)* 395 (3195)* 414 (3300)*
M 52 (960)* 45 (795)* 47 (840)*
F777
*In 20 mV DC, 20Ω and 200 mA DC ranges.
3. Sample complete is a 2.5 µs pulse which indicates that the analog input may be
changed for the next reading.
4. When talking to a fast controller.