Oscilloscope
D
!>uilob!e
-,
A
.C.
!>Upp!y
for
reloy
'---.---'
:
o---~~----_j
'
1011
Fig 4.6
+9V---
--
OV---
-
'-
'
-9V---
--------
Fig 4.7.
Electronic Wattmeter
Chapter
4
20011
'-
There may
be
some contact bounce, but this is unimportant. If a
high speed relay(s) is used it may
be
convenient
to
switch faster
than
20Hz as this will provide a more persistent oscilloscope
display.
The adjustment sequence is as
follows - set 'VOLTS' range
to
10 then:
1.
Close SWv, turn 'AMP' switch
to
1
0,
adjust 'BALANCE
VOLTAGE' R44,to bring the square-wave display to
minimum (zero) amplitude.
2.
With
SWv
still closed, turn 'AMP' switch to .05, adjust
'CURRENT
OFFSET' ,R22,
to
again minimise the amplitude
of the displayed square wave.
26
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