Fluke 8808A User Manual - Page 70

Setting the Trigger Type Configuration, External Trigger via the Computer Interface

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8808A Users Manual If you enter the remote mode with trigger type 4 or 5 selected, the Meter remains in its external trigger state; however, because the Meter is in the remote mode, you will only be able to trigger measurements with rear trigger types 4 and 5. To exit remote mode, perform steps 1 and 2 and select trigger type 2 or 3 (as applicable). Note In external trigger mode (mode 2 to mode 5), *TRG command is always available. Setting the Trigger Type Configuration To set the trigger type configuration using the computer interface, enter the command TRIGGER (where is the trigger type) and press Enter. See Table 4-3 for trigger types. Select trigger type 3 or 5 to enable the settling delay if the input signal is not stable before a measurement is triggered. Typical settling delays are provided in Table 4-3. RS-232 reading transfer rates are provided in Table 4-4. Table 4-4. RS-232 Reading Transfer Rates Rate Readings per Second Internal Trigger Operation (Trigger 1) External Trigger Operation (Trigger 4) Slow 2.5[1] 2.5[2] Medium 20[1] 20[2] Fast 100[1] 100[2] [1] Depends on A/D trigger speed. [2] Depends on how fast the trigger signal is transmitted. External Trigger via the Computer Interface To trigger a measurement using the RS-232 computer interface, enter the command *TRG and press Enter. See the "Common Commands" section later in this chapter for use of *TRG command. To trigger a measurement using pin 9 of the RS-232 interface, see Figure 4-1. +5 V Out (Pin 1) Trig In (Pin 9) Figure 4-1. External Trigger Using Pin 9 of RS-232 Interface eue24.eps 4-10

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8808A
Users Manual
4-10
If you enter the remote mode with trigger type 4 or 5 selected, the Meter remains in
its external trigger state; however, because the Meter is in the remote mode, you will
only be able to trigger measurements with rear trigger types 4 and 5. To exit remote
mode, perform steps 1 and 2 and select trigger type 2 or 3 (as applicable).
Note
In external trigger mode (mode 2 to mode 5), *TRG command is always
available.
Setting the Trigger Type Configuration
To set the trigger type configuration using the computer interface, enter the command
TRIGGER
<type>
(where
<type>
is the trigger type) and press Enter. See Table 4-3 for
trigger types.
Select trigger type 3 or 5 to enable the settling delay if the input signal is not stable before
a measurement is triggered. Typical settling delays are provided in Table 4-3. RS-232
reading transfer rates are provided in Table 4-4.
Table 4-4. RS-232 Reading Transfer Rates
Readings per Second
Rate
Internal Trigger Operation (Trigger 1)
External Trigger Operation (Trigger 4)
Slow
2.5
[1]
2.5
[2]
Medium
20
[1]
20
[2]
Fast
100
[1]
100
[2]
[1] Depends on A/D trigger speed.
[2]
Depends on how fast the trigger signal is transmitted.
External Trigger via the Computer Interface
To trigger a measurement using the RS-232 computer interface, enter the command
*TRG
and press Enter. See the “Common Commands” section later in this chapter for use
of
*TRG
command.
To trigger a measurement using pin 9 of the RS-232 interface, see
Figure 4-1.
+5 V Out (Pin 1)
Trig In (Pin 9)
eue24.eps
Figure 4-1. External Trigger Using Pin 9 of RS-232 Interface