Keysight E4981A - Notes on Inputting a Trigger Signal

Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 117
Executing Measurement
Starting (Triggering) Measurement
Generating a trigger with an external signal
Step 1. Select external trigger mode according to the procedure in “Setting the trigger
mode” on page 116.
Step 2. Press the [Display Format] key.
Step 3. Input a trigger signal (TTL pulse signal) from the Ext Trig terminal on the rear
panel or input EXT_TRIG through the handler/scanner interface to perform a
single measurement.
The trigger signal input from the Ext Trig terminal on the rear panel must meet
the following requirements (input voltage and pulse width).
Step 4. To repeat measurement, repeat
Step 3.
Selecting polarity for BNC external trigger
Step 1. Press the [System] key.
Step 2. Use the cursor keys to select the EXT TRIG POL field.
Step 3. Use the following softkeys:
Notes on inputting a trigger signal
A trigger signal is not recognized until measurement with the previous input
trigger is finished (the EOM signal turns to LOW).
• If a trigger is input twice (double trigger), only the first one is valid.
e4981aue0045
Low level input voltage: 0 - 0.5 V
High level input voltage: 2 - 5 V
Trigger pulse width: longer than 100 sec
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Softkey Description
POS Specifies positive edge trigger
NEG Specifies negative edge trigger
Setting the trigger polarity for BNC external trigger on the rear panel does
not affects the trigger signal on handler/scanner interface.