Agilent Technologies 4294A Instruction Manual Page 121

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Chapter 5 113
Setting Measurement Conditions
Selecting Polarity of External Trigger Input Signal
5. Setting Measurement
Conditions
Selecting Polarity of External Trigger Input Signal
You can specify the polarity of the signal given to the external trigger input terminal on the
rear panel by following the procedure below.
Step 1. Press the
[Trigger] key to display the trigger menu.
Step 2. Press the
SOURCE [ ] key to display the trigger source menu.
Step 3. Press the
EXT POLRTY [ ] key to select the polarity of the external trigger input signal
(pressing the key toggles the selection).
NOTE See Chapter 10 , “Specifications and Supplemental Performance Characteristics,” on page
323 for characteristics of the signal required for the external trigger (triggering with signal
given to the external trigger terminal on the rear panel).
Softkey label Selected polarity of external trigger signal
EXT POLRTY [POS] Positive (leading edge of TTL signal is
detected for triggering)
EXT POLRTY [NEG] Negative (trailing edge of TTL signal is
detected for triggering)
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