Martel Electronics DPM742-BL - Manual (Page 4)

JUMPER LINKS
DP1 Displays decimal point DP1 (199.9).
DP2 Displays decimal point DP2 (19.99).
DP3 Displays decimal point DP3 (1.999).
Lk1 Used during calibration (see above).
DP 3 2 1
DP 3 2 1
DP 3 2 1
Specifications liable to change without prior warning DPM 742-BL Issue 1 August/2002 M.C. Applies to DPM 742-BL/1
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APPLICATIONS
The DPM 750-BL is powered from the 4-20mA signal loop and needs no other power supply. The LED backlighting requires a
separate d.c. power supply. Ensure correct polarity when connecting.
Measuring a 4-20mA loop current.
Measuring a 4-20mA loop current
with other devices in the loop.
www.lascarelectronics.com
4-20mA
Transmitter
4-20mA
Transmitter
I+ I+
I+
I- I-
I-
DPM 742-BL
I+
I-
DPM 742-BL
Measuring a 4-20mA loop current with LED
Backlighting switched on.
If the backlighting supply voltage (V+ - 0V) = 5V,
then no resistor R is required, and connect BL- to 0V.
Note:
4-20mA
Transmitter
I+
I+ BL+
V+
0V
I-
I- BL-
DPM 742-BL
S
BL
R R =
30mA
V+ - 5V
Other
Device
1
Other
Device
2
DPM 742-BL
4-20mA Loop Powered Indicator with Backlighting
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com