Martel Electronics OEM1B - Manual (Page 4)

Specifications liable to change without prior warning OEM 1B Issue 2 September/2002 M.C. Applies to OEM 1B/3
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SCALING
Two resistors Ra and Rb
may be used to alter the
full scale reading (FSR) of
the meter - see table. The
meter will have to be re-
calibrated by adjusting the
calibration potentiometer
on the rear of the module.
FSR Ra Rb
2V 910k 100k
20V 1M 10k
Vin 200V 1M 1k
2000V* 1M 100R
200 A 0R 1k
2mA 0R 100R
Iin 20mA 0R 10R
200mA 0R 1R
µ
Voltage
Current
+
-
Ra
Rb
IHI
Vin or in I
ILO
OEM 1B
*Ensure that Ra is rated for high voltage use.
APPLICATIONS
Do not connect more than one meter to the same power supply if the meters cannot use the same signal
ground. Taking any input beyond the power supply rails will damage the meter.
OEM 1B
3½ Digit LCD Voltmeter Module
www.lascarelectronics.com
Measuring a floating voltage
source of 200mV full scale. Split supply operation. Measuring a supply voltage.
(min. 7.5V, max. 14V).
Measuring current.
Supply MUST be isolated.
COM
RLO
5
6
IHI
ILO
V-
V-
V+
V+
SUPPLY
VOLTAGE
4
3
1
2
510K
10K
510K
+
-
±200mV
IHI
ILO
2
4
1
V-
V-
3
COM
RLO
5
6
V+
V+
COM
RLO
3
V-
V-
V+
V+
-
--
2
1
4
R
+ IHI
ILO
R=0.2
I
FSR
5
6
+
±200mV
0V
1.6V
min.
-
IHI
ILO COM
RLO
2
4 5
6
1
V-
3
V+
V-
V+
14V max
7V min
Measuring 4-20mA to read 0-999.
Supply MUST be isolated.
V-
V+
4
3
1
2 I
IN
6R2
SET
ZERO
100K
2K
5
IHI
ILO
COM
I
OUT
V-
V+
RLO
6
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
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