Hameg HM303-6, Service Manual

Page: 49 / 66

49
Subject to change without notice
17 P2011: Y-Gain CH II at 5 mV/div
– Press CH I/II pushbutton (IN position) to select channel II.
– Locate and identify P2011 on YP-Board.
– Connect a 25 mV
pp
/ 1 kHz square wave signal via a 50 Ω cable
and a 50 Ω through-terminator to input channel II.
– Set input attenuator CH II to 5 mV/div.
– Rotate variable gain knob clockwise to CAL. position.
– Set input coupling to DC.
– Set time base to 0.5 ms/div.
– Adjust P2011 for 5 division signal height.
– Rotate variable gain knob fully counter clockwise (left
stop).
– Check that the signal height is 2 division or less.
– Rotate variable gain knob to CAL. position.
Incorrect (too low) Incorrect (too high) Correct 2.5 : 1 signal < 2div
18 P2015: Y-Gain CH II at 2 mV/div
- Press CH I/II pushbutton (IN position) to select channel II.
- Locate and identify P2015 on YP-Board.
-
Connect a 10 mV
pp
/ 1 kHz square wave signal via a 50 Ω cable
and a 50 Ω through-terminator to input channel II.
- Set input attenuator CH II to 5 mV/div.
- Rotate variable gain knob clockwise to CAL. position.
- Set input coupling to DC.
- Set time base to 0.5 ms/div.
- Press Y-MAG x5 channel II pushbutton (IN position).
- Adjust P2015 for 5 division signal height.
- Rotate variable gain knob fully counter clockwise (left
stop).
- Check that the signal height is 2 division or less.
- Rotate variable gain knob to CAL. position.
Incorrect (too low) Incorrect (too high) Correct 2.5 : 1 signal < 2div
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