External Trigger Input - Agilent Technologies 54621A User Manual

External Trigger Input

External Trigger can be used as a source in several of the trigger types. On
4-channel and mixed-signal oscilloscopes, the external trigger BNC input is on
the rear panel and is labeled Ext Trig. On 2-channel oscilloscopes, the external
trigger BNC input is on the front panel and is labeled Ext Trigger.
Maximum input voltage for the external trigger input:
C A U T I O N Do not exceed 5 Vrms in 50Ω mode on the 54640-series models. Input
protection is enabled in 50Ω mode and the 50Ω load will disconnect if greater
than 5 Vrms is detected. However the input could still be damaged, depending
on the time constant of the signal.
C A U T I O N
The 50Ω input protection mode on the 54640-series models only functions
when the oscilloscope is powered on.
External Trigger Probe Settings
You can set probe attenuation, units, and input impedance for the external
trigger input.
1 Press the
CAT I 300 Vrms, 400 Vpk
CAT II 100 Vrms, 400 Vpk
with 10073C or 10074C 10:1 probe: CAT I 500 Vpk, CAT II 400 Vpk
Mode/Coupling
key in the Trigger section of the front panel.
Triggering the Oscilloscope
External Trigger Input
3-9