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DPM 3AS-BL
SCALING
3‰ Digit Backlit LCD Voltmeter Module
Two external resistors Ra
and Rb may be used to
alter the full scale reading
Voltage
FSR
2V
20V
Ra
910k
1M
Rb
100k
10k
+
Ra
1M
INHI
(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.
(Vin) 200V 1M
A
2000V* 1M
200 m 0R
Current 2mA 0R
( I in) 20mA 0R
200mA 0R
*Ensure that Ra is rated for high voltage use.
1k
100R
1k
100R
10R
1R
Vin or I in
-
Rb
10nF
Input Filter
DPM 3AS-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
3
3
+3.0 to +7.5V
1M
+ INHI
8
V+
+3.0 to +7.5V
1M
+ INHI
8
V+
L+
13
if V+>5V then
Rs=(V+ - 5V)
0.04
I +
+3.0 to +7.5V
1M
INHI
8
V+
–200mV
-
10nF
2
4
5
INLO
COM
REF LO
–200mV
-
10nF
2
4
5
INLO
COM
REF LO
L-
12
I-
Rb
10nF
2
4
5
INLO
COM
REF LO
GND
GND
GND
7
0V
7
0V
7
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 LREF 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 LREF 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 LREF is closed.
9V supply operation (6.0 to 15.0V Meter Power Supply)
+3.0 to +7.5V
8
V+
+6.0 to +15.0V
8
V+
Rs=(V+ - 5V)
+6.0 to +15.0V
8
V+
+
1M
3
INHI
+
1M
3
INHI
L+
13
0.04
I +
1M
3
INHI
–200mV
-
10nF
2
4
5
INLO
COM
REF LO
–200mV
-
10nF
2
4
5
INLO
COM
REF LO
L-
12
I-
Rb
10nF
2
4
5
INLO
COM
REF LO
V-
V-
V-
-3.0 to -7.5V
1
1
0V
1
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 LREF 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 LREF 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 LREF is closed.
DPM 3AS-BL
Issue 4
December/2002
M.C.
Applies to DPM 3AS-BL/5
www.martelcorp.com
4
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com
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