MANUAL #: 19179
MANUAL REV: B
ECO: 43785
MODEL 482A21 LINE POWERED SIGNAL CONDITIONER
2
1.2 Introduction
Model 482A21 is a single-channel, line-operated signal conditioner for ICP
®
transducer systems. This unit provides
constant current excitation to the built-in transducer amplifier and decouples the signal from the DC bias voltage.
The unit also contains provision for fault monitoring the channel, as well as provision for externally varying the constant
current output over a 2 to 20 mA range. This model is factory set at 4 mA.
2.0 Description
Model 482A21 is powered externally by universal power supply model 488B04. The rear panel contains a BNC jack for
transducer signal INPUT and a BNC jack for signal OUTPUT connections.
The AC signal information is decoupled from the sensor bias by a coupling capacitor and brought out to the OUTPUT
jack.
The bias monitor located on the front panel consists of a color-coded panel meter that permanently monitors the sensor
bias level. See sensor specification for correct sensor bias level.
3.0 Installation
See the included outline drawing for dimensions, as well as jack and control locations. Plug the five-pin DIN output
connector on 488B04 into the DC INPUT located on the rear panel of 482A21.
Plug the three-wire line cord of the 488B04 into a source of 85 to 264 VAC, 47 to 440 Hz power and switch the power
on for 482A21.
Pins 3 and 5 are (+)
Pins 1, 2 and 4 are (-)
Outside shell is earth/chassis ground
Figure 1
: External Power Connector and Pin Numbers
Note: For battery operation use model 488B07 in place of model 488B04.
With no transducer connected to the INPUT connector, the front panel bias indicator meter indicates full scale (yellow),
which corresponds to open circuit power supply voltage. See Figure 2.
Meter Reading
Yellow
Green
Red
Condition
Open
Ok
Short
Figure 2
: Fault Monitor Table
