-
-
Before
adjurment
After
to
- -
r-
Electronic Wattmeter
Chapter
4
Repeat steps i and 2 until the 'AMP' switch may be switched
from end to end of its range without any change
in
display.
3.
Open
SWv
and close SW A adjust 'BALANCE
CURRENT',R33,
to
minimise square wave
-this
may result
in
a waveform sequence as in
fig
4.8.
4.
With SW A still closed adjust 'LINEARITY', R35, to remove
remaining pedestals as
in
fig
4.9
-
-
-
-
-
r-
or
or
Figs 4.8
or
to
Fig 4.9
5.
Change the scope sensitivity to 0.02V/div.
Keep SWA closed and close
SWv;
adjust R44
to
bring both
steps equal
as
in
fig
4.
i
0.
r-
r-
-
r-
- -
;--
Fig4.10
27
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