Martel Electronics 135 - Manual (Page 52)

Application Notes
Use of Transmitter Simulator
With Power Source
The purpose of this function is to simulate a 2-wire transmitter
connected in a loop. In order for this function to operate correctly, the
process control loop must have a power source in it. Connect the
calibrator as shown below.
Figure 1
Application Notes
130/135 48
Controller
Input Module
NOTE: Polarity
reversed at
calibrator
INPUT
4-20mA
+ -
Power
Supply
+ -