Martel Electronics LC-110/H - Manual (Page 20)

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6.1.2 In Circuit, LC-110H Loop Power
In “mA Measure with 24V” mode the LC-110H is in circuit and the
loop power is supplied by the LC-110H as shown below.
(+) (–)
MARTEL ELECTRONICS
LC-110H Precision Loop
Calibrator w/HART™
100%
25%
0%
MENU
EXIT
Measure 24V 0.00%
4.000mA
250 Ω
Note: In this situation the 250 Ω HART resistor is enabled. If your loop
already has 250 Ω, do not enable the HART resistor.
6.1.3 Across Circuit, Communicator Only
In “Communicator Only” mode the LC-110H is across the circuit and
the loop power is supplied externally as shown below.
MARTEL ELECTRONICS
LC-110H Precision Loop
Calibrator w/HART™
100%
25%
0%
MENU
EXIT
PT12234
Device Setup & Data
Write LRV & URV Value
Trim, Set, & Zero
Device Diagnostic
Data Log & Config Log
24V
SUPPLY
(+)
(–)
4 to 20mA RL≥250Ω
Note: In the Communicator Only Mode, there must be 250 Ωs
resistance present in the loop.