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4-Wire Bridge Input

2-Wire Single

Ended Input

6-Wire Bridge Input

DEADLOAD COMPENSATION

In some cases, the combined deadload and liveload output may exceed the

range of the 24 mV input. To use this range, the output of the bridge can be offset

a small amount by applying a fixed resistor across one arm of the bridge. This

shifts the electrical output of the bridge downward to within the operating range

of the meter. A 100 K ohm fixed resistor shifts the bridge output approximately

-10 mV (350 ohm bridge, 10 V excitation).

Connect the resistor between +SIG and -SIG. Use a metal film resistor with a

low temperature coefficient of resistance.

BRIDGE COMPLETION RESISTORS

For single strain gage applications, bridge completion resistors must be

employed externally to the meter. Only use metal film resistors with a low

temperature coefficient of resistance.

Load cells and pressure transducers are normally implemented as full

resistance bridges and do not require bridge completion resistors.

Before connecting signal wires, the Input Range Jumper should be verified for proper position.

PAXT INPUT SIGNAL WIRING

3-Wire RTD

Thermocouple

2-Wire RTD

CAUTION: Sensor input common is NOT isolated

from user input common. In order to preserve the

safety of the meter application, the sensor input

common must be suitably isolated from hazardous

live earth referenced voltages; or input common

must be at protective earth ground potential. If not,

hazardous live voltage may be present at the User

Inputs and User Input Common terminals.

Appropriate considerations must then be given to the

potential of the user input common with respect to

earth common; and the common of the isolated plug-

in cards with respect to input common.

CAUTION:

1. Where possible, connect the neutral side of the signal (including current shunts) to the input common of the meter. If the input signal is sourced from

an active circuit, connect the lower impedance (usually circuit common) to the input signal common of the meter.

2. For phase-to-phase line monitoring where a neutral does not exist, or for any other signal input in which the isolation voltage rating is exceeded, an isolating potential

transformer must be used to isolate the input voltage from earth. With the transformer, the input common of the meter can then be earth referenced for safety.

3. When measuring line currents, the use of a current transformer is recommended. If using external current shunts, insert the shunt in the neutral return line. If the

isolation voltage rating is exceeded, the use of an isolating current transformer is necessary.

Current Signal (Amps)Voltage Signal Current Signal (Milliamps)

Before connecting signal wires, the Signal, Input Range and Couple Jumpers

should be verified for proper position.

CAUTION: Connect only one input signal range to the

meter. Hazardous signal levels may be present on

unused inputs.

CAUTION: The isolation rating of the input common of the

meter with respect to the option card commons and the

user input common Terminal 8 (If used) is 125 Vrms; and

250 Vrms with respect to AC Power (meter Terminals 1 &

2). To be certain that the ratings are not exceeded, these