AC-23 Accelerometer User Manual
11.08.2022 / V17 8 / 15
GS_AC-23_UserManual_V17
The geophone is connected in a resistor bridge, driven by a feedback amplifier, which applies the amplified
bridge differential signal in opposite polarity. The bridge is balanced during calibration. The test-line shifts the
voltage at one side of the bridge, which produces a current flow in the geophone.
This current flowing in the Geophone will move the seismic mass. The movement of the mass generates a
voltage across the Geophone, which is detected by the differential amplifier and induces an output signal.
TEST LINE
GEOPHONE
OUTPUT
Feedback loop
Amplifier
Inverter
Figure 5 TEST INPUT configuration
5
Electrical Configuration
The full scale can be adjusted without gain re-calibration by means of jumpers with fixed 0.1% precise
amplifiers.
Figure 6, Full scale setting
The full scale adjustment can be:
Full scale
Jumper position
0.1 g
1-2
0.2 g
3-4
0.5 g
5-6
1.0 g
7-8
2.0 g
9-10
4.0 g
11-12
Full scale Y:
1-2:
+/- 0.1 g
3-4:
+/- 0.2 g
5-6:
+/- 0.5 g
7-8:
+/- 1.0 g
9-10: +/- 2.0g
11-12: +/- 4.0g
Full scale Z:
1-2:
+/- 0.1 g
3-4:
+/- 0.2 g
5-6:
+/- 0.5 g
7-8:
+/- 1.0 g
9-10: +/- 2.0g
11-12: +/- 4.0g
Full scale X:
1-2:
+/- 0.1 g
3-4:
+/- 0.2 g
5-6:
+/- 0.5 g
7-8:
+/- 1.0 g
9-10: +/- 2.0g
11-12: +/- 4.0g
Z
12
cm
Sur
fac
e
lev
el
De
pth
of
drill
ed
bor
eho
le
PV
C
tubi
ng
Y
12
cm
Sur
faM
ini
mu
m
fre
e
dia
met
er
insi
de
cas
ing:
120
mm
.
Ca
sin
g
sea
ling
X
1Mi
nim
um
3
met
ers
Se
alin
g
(co
ncr
ete
mix
) of
tub
e
