Keysight M8195A - Trigger in and Event in LED

Introduction 1
Keysight M8195A Revision 2 – Arbitrary Waveform Generator User’s Guide 23
1.4.3 Trigger IN and Event In LED
This LED indicates that an externally applied signal matches the adjusted threshold
to be used as a Trigger or Event. The LED turns on for ~100 ms for each detected
edge of the correct polarity. I.e. a rising edge turns the LED on for 100 ms if the
polarity is adjusted to rising. If the polarity is adjusted to rising and a falling edge is
externally applied, the LED remains OFF.
Notes:
 In case the edges are applied faster than every 100 ms, the LED is
continuously ON.
 In trigger mode ‘Gated’, the LED is turned on for 100 ms when the gate
signal becomes active. I.e. when the polarity is set to positive, the LED turns
on for 100ms after the rising edge. When the polarity is set to negative, the
LED turns on for 100 ms after the falling edge.
 In trigger mode ‘Gated’, the polarity cannot be set to ‘Either’
Table 5: Trigger IN and Event IN LED
Color
Meaning
Description
Off
No external Trigger (Event)
In case the trigger source is not set to external, this LED is OFF.
ON, green
Valid external Trigger (Event)
detected
In case the trigger mode is set to ‘asynchronous’, a Trigger (Event) is
always valid. Set-up or hold time violations do not exists.
Note: A ‘Force Trigger’ from the SFP or SCPI does not turn the LED ON
ON, red
Invalid external Trigger
(Event) detected
In case the trigger mode is set to ‘synchronous’, a Trigger (Event) can
be invalid because of a set-up or hold time violation. The LED turns On
red in case a set-up or a hold time violation has been detected.
Note A ‘Force Trigger’ from the SFP or SCPI does not turn the LED ON