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DPM 750S-BL
SCALING
3? Digit Backlit LCD Voltmeter Module
Two resistors Ra and Rb
may be used to alter the
full scale reading (FSR) of
Voltage
FSR
2V
20V
Ra
910k
1M
Rb
100k
10k
+
Ra
4 INHI
the meter - see table. The
meter will have to be re-
calibrated by adjusting the
calibration potentiometer
on the rear of the module.
Vin
Current
I in
200V
2000V*
200 μ A
2mA
20mA
200mA
1M
1M
0R
0R
0R
0R
1k
100R
1k
100R
10R
1R
Vin or I in
-
Rb
5
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
+3.0 to +7.5V
1
+3.0 to +7.5V
1
+3.0 to +7.5V
1
V+
V+
V+
5
5
+
±200mV
-
4 INHI
5 INLO
BL-
3
S BL
+
±200mV
-
4 INHI
INLO
BL-
3
S BL
I +
I-
Rb
4 INHI
INLO
BL-
3
S BL
GND
2
R BL = V+ - 5V
30mA
0V
GND
2
R BL = V+ - 5V
30mA
0V
GND
2
R BL = V+ - 5V
30mA
0V
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.
6.0 to 15.0V Meter Power
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 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.
+3.0 to +7.5V
1
+6.0 to +15.0V
1
+6.0 to +15.0V
1
V+
V+
V+
+
±200mV
-
4 INHI
5 INLO
BL-
3
S BL
+
±200mV
-
4 INHI
5 INLO
BL-
3
S BL
I +
I-
Rb
4 INHI
5 INLO
BL-
3
R BL = V+ - 5V
30mA
S BL
V-
R BL = V+ - V- - 5V
30mA
V-
R BL = V+ - 5V
30mA
V-
R BL
-3.0 to -7.5V
9
9
0V
9
0V
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.
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 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.
Specifications liable to change without prior warning
DPM 750S-BL
Issue 1
August/2002
M.C.
Applies to DPM 750S-BL/2
www.martelcorp.com
Page 4 of 4
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com Page 4 of 4
page 4 of 4
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