Tektronix DCM300, Technical Reference

Page: 208 / 382

PS280 and PS283 Adjustment Procedures
14
Handheld and Benchtop Instruments Basic Service
Test Equipment
To ensure accurate adjustments, use the recommended or equivalent test
equipment specified in Table 6 on page 6. If you substitute equipment, always
choose instruments that meet or exceed the minimum requirements.
NOTE
. Before making any adjustment, warm up the test equipment according to
the manufacturer’s recommendations.
Preparation for Adjustment
The following guidelines apply to all PS280 and PS283 power supply adjust-
ments:
H
Perform the adjustments in a 20
_
to 30
_
C (68
_
to 104
_
F) ambient
environment with a relative humidity of 75% or less.
H
Before making any adjustment, warm up the instrument for at least 20
minutes.
H
Read the Safety Summary at the beginning of this manual.
H
Do not alter any setting without reading the entire adjustment procedure first.
H
Do not alter any setting unless a performance characteristic cannot be met at
the current setting.
You must remove the instrument cover to make internal adjustments.
WARNING. To avoid electrical shock, disconnect the power cord from its source
while removing the instrument cover. Following the adjustment procedure,
replace the instrument cover before using the power supply.
To remove the instrument cover, refer to Figure 5 while performing the following
steps.
1. Remove the two handle mounting screws and remove the handle.
2. Remove the three screws on the left side and the three screws on the right
side of the instrument.
3. Slide the cover toward the rear of the instrument and lift.
To reinstall the cover, perform steps 1 through 3 above in reverse order.
Remove Instrument Cover