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Operating the Meter Using the Computer Interface
Triggering Output 4
4-9
+/- 1.0E+9 Overload (0L on the display)
Triggering Output
The Meter takes measurements when triggered to do so. There are five trigger types,
which are described in Table 4-3. Triggers fall into two basic categories:
• Internal trigger, which triggers measurements continuously.
• External trigger, which triggers a measurement at the direction of the user.
A measurement can be externally triggered as follows:
• External trigger with rear trigger disabled. This includes trigger types 2 and 3, as
described in Table 4-3.
• External trigger with rear trigger enabled. This includes trigger types 4 and 5, as
described in Table 4-3.
• *TRG command
For use of the *TRG command, see “Common Commands.”
Table 4-3. Trigger Types
Type Trigger Rear Trigger Settling Delay
1 Internal Disabled —
2 External Disabled Off
3 External Disabled On
4 External Enabled Off
5 External Enabled On
External Triggering from the Front Panel
To enable external triggering from the front panel, perform the following procedure:
1. Press Q then J. Ext Trig and a number corresponding to the selected trigger
type (1, 2, 3, 4, or 5) are displayed. See Table 4-3 for trigger types.
2. Press U or V to step through the trigger type list. Highlight the trigger type as
follows, and then press R for two seconds to select it.
3. Select trigger type 2 to disable the settling delay; or select trigger type 3 to enable the
settling delay. See Table 4-3 for typical settling delays.
4. When trigger type 2 or 3 is selected, Ext Trig is displayed confirming that you are not
in the remote mode and an external trigger is enabled. (If you are not in the remote
mode, you will not be able to trigger measurements from the front panel.)
5. Press J to trigger a measurement. (Each time you press J you trigger a
measurement.)
6. To return the Meter to its internal (continuous) trigger state, perform step 3 and select
trigger type 1.
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).
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