Fluke 8842A Instruction Manual page 24

8842A
Instruction Manual
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.
NOTES:
*In 20 mV DC, 20 and 200 mA DC ranges.
1-10
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 s. 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:
RATE
S 472 (3800)*
M 52 (960)*
F
3. Sample complete is a 2.5 s pulse which indicates that the analog input may be
changed for the next reading.
4. When talking to a fast controller.
A/D CONVERSION TIME (ms)
50 Hz
395 (3195)*
45 (795)*
7
60 Hz
414 (3300)*
47 (840)*
7
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400 Hz
7