Trigger Hysteresis Adjustment; Event Trigger Delay Adjustment - LeCroy WaveSurfer 400 Series Service Manual

6.9.3.5 Trigger hysteresis adjustment

6.9.3.5.1 Auto-adjustment
Adjustment standard
Adjustment method
6.9.3.5.2 Manual adjustment
In the "Maintenance1" menu, verify that "Channel Adjustment Value – Hyst " has a default value
of 128.

6.9.3.6 Event trigger delay adjustment

6.9.3.6.1 Auto-adjustment
Adjustment standard
Adjustment method
6.9.3.6.2 Manual adjustment
Method for adjusting edge event trigger delay
Setting Timebase ⇒ 1ns/div, RIS
Method for adjusting qualified event trigger delay
6-42 Maintenance
Trigger hysteresis: 0.3 ± 0.01 div
(1) Without inputting any signal, run "Automatic Adjustment - Trig
Hyst" in the "Mainenance1" menu.
(2) Trigger hysteresis is adjusted automatically to become 0.3div.
(3) After the auto-adjustment is completed, click "Save to HW" to save
to the EEPROM.
Delay of ±100ps or less for an Edge trigger (holdoff by: Events) or a Qualify
trigger (Qualify by: Events) trigger point when the trigger point is Edge
trigger (holdoff: OFF)
(1) Run "Automatic Adjustment - Edge & Qual TrigDelay" in the
"Mainenance1" menu.
Trigger point correction between Edge trigger holdoff OFF and Evts,
and trigger point correction for Qlfy Events between Qualified trigger
wait OFF and Evts are adjusted automatically.
(2) After the auto-adjustment is completed, click "Save to HW" to save
to the EEPROM
(1) Input a high-speed pulse signal and set the trigger level to roughly the
midpoint of the amplitude.
(2) In the "Measure" menu, set "Delay – C1." Click "Statistics" to turn
"On" this function.
(3) In the "Trigger" menu, select "Edge Trigger" and switch "Holdoff
by" to "None" and Events 1#." In the "Maintenance1" menu, adjust
"Other Adjustment – DelayEdge" such that the "mean" difference for
each measured value becomes ±100ps or less.
(4) Click "Save to HW" to save to the EEPROM.