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Ordering Information
To configure a 421B3X-Series amplifier, construct a full model number according to the below scheme.
MODEL
INPUT SENSITIVITY
OUTPUT SENSITIVITY
FILTERS
Value
Units
Value
Units
High-Pass Low-Pass
A A
A
A B
C
C
C
C
D
E
E
F F
F
421B3X
0001-1000
G/B/P
0001-2000
G/I/M/P/B X5-10
002-200
0001-0200
pC/g
0001-1000
pC/bar
0001-0100
pC/psi
G=g
B=bar
P=psi
0010-2000 mV/g
0001-0005
mV/in/s
0010-0100
mV/mm/s
0001-1000 mV/psi
0001-0010
mV/mbar
G=g
I=in/s
M=mm/s
P=psi
B=mbar
X5=0.5 Hz
01=1 Hz
02=2 Hz
05=5 Hz
10=10 Hz
002=200 Hz
005=500 Hz
010=1 kHz
020=2 kHz
050=5 kHz
100=10 kHz
200=20 kHz
Full Model Number for Pre-Configured Models:
421B30 for Use with Pressure Sensor = 421B3X-0017-P-0350-P-10-050
421B31 for Use with Accelerometer = 421B3X-0010-G-0100-G-10-010
Special Considerations
High source capacitance may degrade the performance of the amplifier. Source capacitance is the
input capacitance to the amplifier defined as transducer capacitance plus cable capacitance. If the
source capacitance is increased due to a long length of cable, amplifier noise will increase and
frequency response will decrease.
Use with High Temperature Sensors
The amplifier is specifically designed for use with piezoelectric sensors with an operating temperature
range of greater than 500 °F (260 °C), which typically have lower insulation resistance values. The
amplifier will operate with insulation resistances as low as 50 kOhm.
Note
: When using the 421B3X series differential charge amplifier with high temperature sensors, the
unit may have a longer turn-on time than typical charge amplifiers which are designed for use with
sensors with high insulation resistance.
Caution!
Excessive accumulated charges on the input cables can destroy the field effect transistor
(FET) in the amplifier. These charges can be grounded before connection by shorting the center pin on
the cable connector plug to its knurled nut with any metallic object.
