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SP 400
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
4
INH
(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.
200V 1M
2000V* 1M
200 μ A 0R
Current 2mA 0R
20mA 0R
200mA 0R
*Ensure that Ra is rated for high voltage use.
1k
100R
1k
100R
10R
1R
Vin or I in
-
Rb
5
SP 400
INL
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
+3.0 to +7.5V
1
+3.0 to +7.5V
1
V+
V+
V+
+
±200mV
-
4
5
INH
INL
DP1
DP2
DP3
6
7
8
No DP
+
±200mV
-
4
5
INH
INL
BL-
3
I +
I-
Rb
4
5
INH
INL
if V+>5V then
GND
2
0V
GND
2
Rs=(V+ - 5V)
0.04
0V
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.
9V supply operation (6.0
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.
to 15.0V Meter Power Supply)
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+
+
4
INH
+
4
INH
I +
4
INH
±200mV
-
5
INL
BL-
3
±200mV
-
5
INL
BL-
3
I-
Rb
5
INL
-3.0 to -7.5V
V-
9
Rs=(V+) - (V-) - 5V
0.04
V-
9
Rs=(V+ - 5V)
0.04
0V
V-
9
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 SP 400 Issue 6 June/2002 M.C. Applies to SP 400/3
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
www.lascarelectronics.com
Page 4 of 4
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