Martel Electronics LC100 - Manual (Page 9)

Communicator during calibration or installation
of HART™ transmitters. The internal resistor
takes the place of the 250 ohm resistor normal-
ly installed during the use of the model 275
Communicator. An internal jumper can be
removed to enable this feature if desired. The
unit is shipped with the jumper in place. To
remove the jumper open the case and refer to
Figure 2 to locate the jumper, then pull off the
jumper to enable the resistor. The jumper can
be stored outside of the unit or re-installed only
on one pin so that the circuit remains open.
Figure 2
Note: When the 250 ohm resistor is enabled
the load driving capability is reduced from 1200
ohms to 950 ohms. In most cases this should
not be a problem when calibrating Non-HART™
compatible products.
4. Basic Operating Modes
The LC100 offers 4 modes of milliamp opera-
tion and one voltage measure mode. The fol-
lowing text and figures explain the various oper-
ating modes:
7