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V1
3? Digit 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.
Voltage
Vin
Current
Iin
FSR
2V
20V
200V
2000V*
200 μ A
2mA
20mA
200mA
Ra
910k
1M
1M
1M
0R
0R
0R
0R
Rb
100k
10k
1k
100R
1k
100R
10R
1R
+
Vin or I in
-
Ra
Rb
INHI
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.
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
1
V+
+7.0 to +12V
1
V+
+7.0 to +12V
+
3 IN
HI
L1
DP1
6
I +
3 IN
HI
L1
DP1
6
±200mV
-
4
IN LO
V1
XDP
5
I-
4
IN LO
V1
XDP
5
V-
2
0V
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. Check Link L1 is closed.
+3.5 to +6.0V
1
V+
V-
2
0V
Measuring a current referenced to a floating supply, i.e. the
current being measured and the meter's power supply are
isolated from each other. Check Link L1 is closed.
±200mV
+
-
3
4
IN HI
IN LO
L1
V1
DP1
XDP
6
5
V-
2
-3.5 to -6.0V
Measuring a single ended input referenced to supply, i.e.
the input voltage and the meter's power supply share the
same 0V rail. Check Link L1 is open.
Specifications liable to change without prior warning
V1
Issue 3
January/2002
M.C.
Applies to V 1/2
www.lascarelectronics.com
www.martelmeters.com
Page 4 of 4
page 4 of 4
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