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DPM 2AS-BL
3? Digit Backlit LCD Voltmeter Module
SCALING
Two external 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
2V 910k
Voltage 20V 1M
(Vin) 200V 1M
2000V* 1M
200 μ A 0R
Current 2mA 0R
( I in) 20mA 0R
200mA 0R
*Ensure that Ra is rated for high voltage use.
Rb
100k
10k
1k
100R
1k
100R
10R
1R
+
Vin or I in
-
Ra
Rb
INHI
DPM 2AS-BL
INLO
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.
5V supply operation (3.0 to 7.5V Meter Power Supply)
+3.0 to +7.5V
1
V+
No DP
+3.0 to +7.5V
1
V+
+3.0 to +7.5V
1
V+
+
±200mV
-
5
6
INHI
INLO
GND
2
DP1
DP2
DP3
XDP
7
8
9
10
0V
+
±200mV
-
5
6
INHI
INLO
GND
2
BL-
4
if V+>5V then
Rs=(V+ - 5V)
0.015
0V
I +
I-
Rb
5
6
INHI
INLO
GND
2
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.
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.
9V supply operation (6.0 to 15.0V Meter Power Supply)
+3.0 to +7.5V
1
+6.0 to +15.0V
1
+6.0 to +15.0V
1
V+
V+
V+
+
5
INHI
+
5
INHI
I +
5
INHI
±200mV
-
6
INLO
BL-
4
±200mV
-
6
INLO
BL-
4
I-
Rb
6
INLO
-3.0 to -7.5V
V-
3
Rs=(V+) - (V-) - 5V
0.015
V-
3
Rs=(V+ - 5V)
0.015
0V
V-
3
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.
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 2AS-BL
Issue 2
February/2002
M.C.
Applies to DPM 2AS-BL/1
www.lascarelectronics.com
Page 4 of 4
www.martelmeters.com
Page 4 of 4
page 4 of 4
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