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4.2. Circuitry
PROBE
FEEDBACK WINDING
2
2
EXCITA T ION WINDING
SIGNAL
IN
INPUT
FILT ER
BARTINGTON INSTRUMENTS
Figure 4. Mag-01 system schematic
SUMMING A MPLIFIER &
AT TENUAT OR
PRECISION VOLT A GE TO
CURRENT CONVERTOR
FEEDBACK
CURRENT
S
F o
SW ITCHED
OFFSET CONTROL
50
40
m
60
0-90 T IN
30
70
m
+ -
10 T STEPS
20
80
10
90
0
+
-
PROBE
ON
ON
EXCITA T ION
OFF
OSCILLAT OR
DUAL
PRECISION
REFERENCE
2F
o
+7V
REGULAT ED
POW ER
SUPPLY
0V
-7V
Figure 5. Mag-01H system schematic.
Page 8 of 20
A-D CONVERTOR &
4 1/2 DIGIT LCD
RANGE
+19.999
CONTROL
SW ITCH
X10
IC
+
X1
-
0v
OUTPUT
FILT ER
-3dB @ 10Hz
DEMODULAT OR
+6V
POW ER
ON / OFF
0v
ANALOG
OUTPUT
12V d.c.
INLET
CONSTA NT VOLT A GE
BAT TERY CHARGER
CHARGE INDICAT OR
6V 1.1Ah
SEALED BAT TERY
OM0382/9
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