53
Subject to change without notice
24
C2108/C2103:
100 : 1 Attenuator compensation CH II
Do not adjust until the adjustment of item 23 has been made.
– Locate and identify trimmers C2108 and C2109 for CH II on
YP-Board.
– Set input coupling to DC.
– Set attenuator CH II to 0.5 V/div.
– Set amplitude calibrator output voltage to 5 V
pp
(2.5 V
pp
at the 2:1 pre-attenuator output) terminated with 1MΩ
(oscilloscope input impedance).
– Adjust C2108 for a fl at top.
– Adjust C2103 for a leading
edge without overshoot.
– Repeat C2108 and C2103
adjustment until optimum
is obtained.
Correct
C2108 undercompensate
C2108 overcompensate
C2103 undercompensate
C2103 overcompensate
25
P2012:
ADDition balance
– Press DUAL pushbutton (IN position).
– Locate and identify P2012 on YP-Board.
– Set input coupling CH I and II to GND.
– Move baseline channel I with Y-POS. I control 1 division
above the horizontal centre line of the graticule.
– Move baseline channel II with Y-POS. II control 1 division
below the horizontal centre line of the graticule.
– Release DUAL pushbutton (OUT position).
– Press ADD pushbutton (IN position).
– Adjust P2012 to move the baseline to the horizontal centre
line of the graticule.
Basic position
Incorrect
Incorrect
Correct
P2008
P2011 P2012
P2006
P2007
P2005
P2002
P2001
C2007
C2010
C2009
C2011
P2003
C2107
C2108
C2103
C2110
P2016
P2014
P2015
P2010
P2009
YP-Board
P2008
P2011
P2012
P2006
P2007
P2005
P2002
P2001
C2007
C2010
C2009
C2011
P2003
C2107
C2108
C2103
C2110
P2016
P2014
P2015
P2010
P2009
YP-Board
A d j u s t m e n t P r o c e d e r e H M 3 0 3 - 6
