47
Subject to change without notice
15
C2011/C2007:
10:1 Attenuator compensation CH I
– Set attenuator CH I to 5 mV/div.
– Set amplitude calibrator to 1 kHz and connect a 2:1 pre-
attenuator (HZ23) via 50 Ω cable to input of CH I.
– Set amplitude calibrator output voltage to 50 mV
pp
(25
mV
pp
at the 2:1 pre-attenuator output) terminated with 1MΩ
(oscilloscope input impedance).
– Adjust trimmer in pre-attenuator for a fl at square wave
top.
– This adjustment must not be changed during the following
adjustment.
– Locate and identify trimmers C2011 and C2007 for CH I on
YP-Board.
– Set input coupling to DC.
– Set time base to 2 ms/div.
– Set attenuator CH I to 50 mV/div.
– Set amplitude calibrator output voltage to 0.5 V
pp
(0.25
V
pp
at the 2:1 pre-attenuator output) terminated with 1MΩ
(oscilloscope input impedance).
– Adjust C2011 for a fl at top.
– Adjust C2007 for a leading edge without overshoot.
– Repeat C2011 and C2007 adjustment until optimum is ob-
tained.
Do not change the 2:1 (HZ23) pre-attenuator adjustment and
continue with item 16.
2 : 1 overcompensate
2 : 1 undercompensate
2 : 1 correct
C2007 undercompensate
C2011 overcompensate
C2007 overcompensate
C2011 undercompensate
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
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
