Martel Electronics DPM750S-BL - Manual (Page 4)

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Page 4 of 4
DPM 750S-BL
3½ Digit Backlit LCD Voltmeter Module
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
in 20mA 0R 10R
200mA 0R 1R
µ
I
Voltage
Current
+
-
Ra
Rb
INHI
Vin or in I
INLO
*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.
3.0 to 7.5V Meter Power Supply
6.0 to 15.0V Meter Power
+3.0 to +7.5V
+3.0 to +7.5V
-3.0 to -7.5V
+3.0 to +7.5V
+6.0 to +15.0V
+3.0 to +7.5V
+6.0 to +15.0V
V+
V+
INHI
INHI
INLO
INLO
BL- BL-
S
BL
S
BL
R =
30mA
BL
V+ - 5V R =
30mA
BL
V+ - 5V
0V 0V
GND
V-
+
+
-
-
±200mV
±200mV
Measuring a single ended input voltage
referenced to supply, i.e. the input
voltage and the meter's power supply
share the same 0V rail. Ensure solder
link LCOM is open.
Measuring a single ended input voltage
referenced to a split supply, i.e. the input
voltage and the meter's power supply
share the same 0V rail. Ensure solder link
LCOM is open.
V+
V+
V+
V+
INHI
INHI
INHI
INHI
INLO
INLO
INLO
INLO
GND
V-
GND
V-
+
+
-
-
±200mV
±200mV
Measuring a current from a circuit which is
floating with respect to the DPM's supply,
i.e. the current and the meter's power
supply are isolated from each other. Ensure
solder link LCOM is closed.
Measuring a current from a circuit which is
floating with respect to the DPM's supply,
i.e. the current and the meter's power
supply are isolated from each other. Ensure
solder link LCOM is closed.
Measuring an input voltage referenced to a
floating supply, i.e. the input voltage and the
meter's power supply are isolated from each
other. Ensure solder link LCOM is closed.
Measuring an input voltage referenced to a
floating supply, i.e. the input voltage and
the meter's power supply are isolated from
each other. Ensure solder link LCOM is
closed.
Rb
Rb
I +
I +
I-
I-
1 1 1
2 2 2
4
3 3
BL-
S
BL
R =
30mA
BL
V+ - 5V
0V
3
BL-
S
BL
R =
30mA
BL
V+ - V- - 5V
3
BL-
S
BL
R =
30mA
BL
V+ - 5V
0V
3
BL-
S
BL
R =
30mA
BL
V+ - 5V
R
BL
0V
3
4 4
5
5 5
1
9
4
5
1
9
4
5
1
9
4
5
4
5
www.lascarelectronics.com
Specifications liable to change without prior warning DPM 750S-BL Issue 1 August/2002 M.C. Applies to DPM 750S-BL/2
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
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