4
Maintenance
38
Keysight 478A Operating and Service Manual
Refer to
and proceed as follows:
1
Remove the three screws (A).
2
Slide instrument out of its cover.
3
Plug cover into model 431.
4
Set:
If meter is pegged downscale:
1
Set RANGE to 10 mW.
2
Set ZERO and VERNIER to mid-range.
3
Turn screws (B) clockwise, 1 8 turn alternatively.
4
When meter pointer rises, trim to zero with each adjusting screw.
5
Replace cover and three screws (A). The instrument is now operative.
MOUNT RES:
200
W
MOWER:
ON
CAUTION
If there is a sudden jump in meter indication when advancing either screw,
back off 1 8 turn, and do not advance that screw further. Check resistance as
in
on page 36. If either screws bottoms, do not apply force.
Thermistor replacement (see
“Thermistor Assembly Replacement
on page 39) is indicated.
NOTE
Make sure the three screws in the body of the thermistor mount are tight when
the mount is put together; this insures quiet operation.
Содержание 478A
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Страница 45: ...Keysight 478A Thermistor Mount Operating and Service Manual 45 A Appendix A Introduction 46 Manual Changes 47...