Front End Adjustment - LeCroy WaveSurfer 400 Series Service Manual

6.9.3.2 Front end adjustment

6.9.3.2.1 Coarse adjustment of channel offset
Setting CHx ⇒ DC 1MΩ, 20mV/div, 0V offset, BWL=20MHz
Timebase ⇒ 1ms/div
Adjustment method
Note: The auto adjust function will not operate unless the "Auto cal" setting is restored.
6.9.3.2.2 DC gain adjustment
Adjustment standard
Setting
Adjustment method
Adjust the smoothing of the square-wave.
Adjustment locations
Gain adj.
6-38 Maintenance
(1) Open the "Production\PichuAcqBoard\Calibration" menu within the
"Service" menu.
(2) Select "FE offsetA" from the "Curves" menu, click "Auto cal,"
remove the check mark and click "Reset current."
(3) Select "FE gain->offsetA" from the "Curves" menu, click "Auto cal,"
remove the check mark and click "Reset current."
(4) Adjust "Channel Offset Adjustment" in the "Maintenance2" menu so
that all channel traces appear in the center of the display screen.
(5) Press "Save To HW" to save to the EEPROM.
(6) Re-enter the "Calibration" menu.
(7) Select "FE offsetA" from the "Curves" menu, click "Auto cal" and
add a check mark.
(8) Select "FE gain->offsetA" from the "Curves" menu, click "Auto cal"
and add a check mark.
Overshoot: 0.1% or less
Rounding: none
CHx ⇒ DC 50Ω, 5mV/div, BWL=20MHz
Timebase ⇒ 2ms/div
Input a 500mV, 100Hz square-wave signal from the PG-506.
CH1 CH2
2R104 3R104
CH3 CH4
4R104 5R104