34
Subject to change without notice
6.7 CH II 100 mV/div (3% accuracy)
– Set attenuator CH II to 100 mV/div.
– Connect a 500 mV
pp
(accuracy ± 0.1%), 1 kHz square wave
signal via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.8.
6.8 CH II 200 mV/div (3% accuracy)
– Set attenuator CH II to 200 mV/div.
– Connect a 1 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.9.
6.9 CH II 500 mV/div (3% accuracy)
– Set attenuator CH II to 500 mV/div.
– Connect a 2.5 V
pp
(accuracy ± 0.1%), 1 kHz square wave
signal via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.10.
6.10 CH II 1 V/div (3% accuracy)
– Set attenuator CH II to 1 V/div.
– Connect a 5 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.11.
6.11 CH II 2 V/div (3% accuracy)
– Set attenuator CH II to 2 V/div.
– Connect a 10 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.12.
6.12 CH II 5 V/div (3% accuracy)
– Set attenuator CH II to 5 V/div.
– Connect a 25 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 5 div.
Continue with item 6.13.
6.13 CH II 10 V/div (3% accuracy)
– Set attenuator CH II to 10 V/div.
– Connect a 40 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 4 div. (3% = 1.2 mm).
Continue with item 6.14.
6.14 CH II 20 V/div (3% accuracy)
– Set attenuator CH II to 20 V/div.
– Connect a 40 V
pp
(accuracy ± 0.1%), 1 kHz square wave signal
via 50
Ω
cable to input CH II.
– For 0% error the signal height is 2 div. (3% = 0.6 mm).
7. CH I: 100 Hz square wave
– Check that input coupling CH I is set to DC.
– Check that CH I variable gain knob is set to CAL. position.
– Set time base to 2 ms/div.
– Check that input attenuator CH I is set to 5 mV/div.
– Check that the square wave signal is displayed with a fl at top.
8. CH II: 100 Hz square wave
– Press CH I/II pushbutton (IN position) to select channel II.
– Check that input coupling CH II is set to DC.
– Check that CH II variable gain knob is set to CAL. posi-
tion.
– Set time base to 2 ms/div.
– Check that input attenuator CH II is set to 5 mV/div.
– Check that the square wave signal is displayed with a fl at
top.
9. CH I: Variable Balance
– Rotate variable gain knob of channel I continuously fully
counter clockwise (left stop) and clockwise (right stop)
and check that the trace does not move more than 2 mm
(0.2 div) in vertical direction.
10. CH II: Variable Balance
– Press CH I/II pushbutton (IN position) to select channel II.
– Rotate variable gain knob of channel II continuously fully
counter clockwise (left stop) and clockwise (right stop)
and check that the trace does not move more than 2 mm
(0.2 div) in vertical direction.
11. CH I: Y-MAG. x5 Balance
– Press and release the CH I Y MAG x5 pushbutton and check
that the trace does not move more than 2 mm (0.2 div) in
vertical direction.
12. CH II: Y-MAG. x5 Balance
– Press CH I/II pushbutton (IN position) to select channel II.
– Press and release the CH II Y MAG x5 pushbutton and check
that the trace does not move more than 2 mm (0.2 div) in
vertical direction.
13. CH II: INVert Balance
– Press CH I/II pushbutton (IN position) to select channel II.
– Press and release the INV. pushbutton and check that the
trace does not move more than 2 mm (0.2 div) in vertical
direction.
14. ADD Balance
– Press DUAL pushbutton.
– Set both traces exactly on the horizontal centre line and do
not change the setting until this check has been fi nished.
– Release DUAL pushbutton (OUT position.
– Press and release the ADD pushbutton (IN position) and
check that the trace does not move more than 2 mm (0.2
div) in vertical direction.
15. CH I: Attenuator
15.1 CH I Input Capacitance Adaptation
– Connect a 50 mV
pp
, 1 kHz square wave signal via a 2:1 pre-
attenuator (1M
Ω
with parallel C-trimmer) to input CH I.
– Check that DC input coupling is selected.
– Check that attenuator is set to 5 mV/div.
– Check that time base is set to 0.2 ms/div.
– Check for 5 divisions signal height at 5 mV/div. attenuator
setting.
– Adjust C-trimmer in 2:1 pre-attenuator for leading edge
without over- or undershoot and fl at square wave top.
– Do not change the C-trimmer settings until item 15 is fi nished.
P e r f o r m a n c e C h e c k H M 3 0 3 - 6
