Martel Electronics MasterCAL - Manual (Page 58)

MasterCAL
Users Manual
48
Simulating a 4 to 20 mA Transmitter
You can configure the calibrator as a load on a
current loop through the SOURCE mA function.
When you press the
M key in SOURCE mode, the
display prompts you to select Source mA or Simulate
Transmitter . When you Source mA the calibrator is
sourcing current, and when you Simulate Transmitter
the calibrator is sourcing a variable resistance to
regulate current to the specified value. Connect an
external loop supply to the positive (top) mA jack as
shown in Figure 16.
Note
Also see “Transmitter Mode,” in which the
calibrator can be set up to temporarily take
the place of a two-wire process transmitter.