Fluke Portable Multimedia Player 8842a Manual De Usuario
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.
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
Delay” on previous page.) If the delay is disabled by using the T3 or T4 command,
then the delay is 1 ms±150
µ
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.
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)*
F
7
7
7
*In 20 mV DC, 20
Ω
and 200 mA DC ranges.
3. Sample complete is a 2.5
µ
s pulse which indicates that the analog input may be
changed for the next reading.
4. When talking to a fast controller.