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4-4
Calibrating and Adjusting
To adjust the power supply
To adjust the power supply
The oscilloscope power supply has both a +3.3 V adjustment, and a
+5.1 V / -5.2 V balance adjustment. Other oscilloscope voltages are based on
the +3.3 V adjustment.
In this procedure, you will use a digital multimeter to measure the +3.3 V and
+5.1 V / -5.2 V test points, and adjust the power supplies to be within tolerance,
if necessary.
Table 4-1
Equipment Required to Adjust the Power Supply
1
Prepare the oscilloscope for the voltage adjustment.
a Turn off the oscilloscope and disconnect the power cable.
b Remove the oscilloscope cover. For a list of parts, see the “Replaceable
Parts” chapter, then return here.
c Place the oscilloscope on its side.
d Connect the negative lead of the digital multimeter to a ground point on the
oscilloscope chassis.
e Reconnect the power cable.
f Turn on the oscilloscope.
Equipment Critical Specifications Recommended Model/Part
Digital multimeter 0.1 mV resolution, accuracy ±0.05% Agilent 34401A
service.book Page 4 Wednesday, December 18, 2002 8:35 AM