Checks
and
Adjustments
Auto DC
Balance Routine
The oscilloscope can automatically dc-balance Channel
1
and Channel 2. This
routine minimizes trace shifts when adjusting the VOLTS/DIV and VOLTS/DIV VAR
controls, and when switching Channel 2 between noninverted and inverted. This dc
balance remains valid as long as the instrument is operating within 5°C of the
ambient temperature at which the routine was performed, provided the instrument
has had a 20-minute warm-up period.
NOTE
This DC balance is required for
accurate measurements
with Parametric
Measurements.
To initiate the adjustment, press the upper, input-coupling buttons for both
Channel
1
and Channel 2 at the same time. When the Auto DC Balance cycle is
complete, the instrument will return to normal operation.
NOTE
If a circuit
defect prevents accurate
dc
balance,
the
routine
halts and
LIMIT
is displayed. Press the upper Trigger COUPLING button to continue
balancing the remainder
of
the
circuitry.
If power to the instrument is interrupted before the balancing cycle is complete,
a DC balance error may be apparent in subsequent operation. When power is
restored,
restart the DC balance routine, after the instrument has warmed up.
2465B/2455B/2445B Operators
4-3
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