BARTINGTON INSTRUMENTS
Page 8 of 20 OM0382/9
4.2. Circuitry
Figure 4. Mag-01 system schematic
Figure 5. Mag-01H system schematic.
PROBE
EXCITATION WINDING
FEEDBACK WINDING
SUMMING AMPLIFIER &
PRECISION VOLTAGE TO
CURRENT CONVERTOR
6V 1.1Ah
SEALED BATTERY
0v
DEMODULATOR
CHARGE INDICATOR
CONSTANT VOLTAGE
BATTERY CHARGER
12V d.c.
INLET
+19.999
A-D CONVERTOR &
4 1/2 DIGIT LCD
ANALOG
OUTPUT
OUTPUT
FILTER
-3dB @ 10Hz
-
0v
+
X10
ATTENUATOR
RANGE
CONTROL
SWITCH
SWITCHED
OFFSET CONTROL
0-90 T IN
10 T STEPS
2
2
FEEDBACK
CURRENT
S
Fo
IC
40
60
50
X1
INPUT
FILTER
SIGNAL
IN
o
2F
REGULATED
POWER
SUPPLY
-7V
0V
POWER
ON / OFF
+6V
90
DUAL
PRECISION
REFERENCE
+7V
PROBE
EXCITATION
OSCILLATOR
m
+-
m
+
ON
-
OFF
10
30
0
20
ON
80
70
