CALIBRATION ADJUSTMENT PROCEDURE 5-5
WARNINGt
To
prevent
personal injury, do not perform any diaaseembly
procedures before
reading
chapter 6.
When the ScopeMeter
Is disassembled, it is not possible to apply the +12V programming
voltage in
the normal
way. It Is possible to apply the -!'12V programming vol^ge
by means of two test clips (see
tlgure
5.2).
Remove all voltage sources from the ScopnMeter Turn the digital Al PCB.
mounted in the top cover
so that the display
and the keyboard are facing down. Connect the
•••12V
programming
voltage to the
appropriate places
on the PCB. It can be helpful to first install two metal screws again.
See
figure
5.2.
Be sure not to short circuit with
the metal shielding, mounted on the analog
A1
PCB. Turn
the top
cover and the mounted PCB.
Connect the ScopeMeter to the power supply and switch the Instrument
on. Go to the SERVICE menu
and press the CALIBRATE ScopeMeter sotb<ey. You
can make the
adjustments necessary
with
six
trim capacitors (three for the attenuator of each channel)
and two
adjustment potentiometers
(for^e Analog ASIC).
*12V
Figure 5.2
Connecting the 12V programming voltage for Hardware
SCOPE Calibration
Adjustments.
NOTE: You only have to
do Hardware SCOPECalibration Ar^ustments, if
you have repaired the
ScopeMeter in the Attenuator
sections or In the Analog ASIC circuitry.
After you have done
a Hardware SCOPECalibration
Ac^'ustment or you have ar^usted one of the
potentiometers,
you always need to
do a
full
(software) SCOPE and METER calibration,
ft you decide
not to do the
Hardware
Ca//Praf/or? Adjustment now,
you can advance to
calibra^on
S5 by
pressing
the upper seiect/adjust key
4
times.
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