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8808A
Users Manual
4-10
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
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