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SP 300
SCALING
3? Digit LED Voltmeter Module
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
Current
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
-
LA
Ra
Rb
4
5
IH
SP 300
IL
* Ensure that Ra is rated for high voltage use.
** Ensure solder link LA is cut.
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.
COM
IH
+
±200mV
-
4
5
3
1
V+
IH
IL
COM
V+
+
±200mV
-
4
5
IH
IL
1
V+
V+
4-20mA
current loop
I +
I-
220k
5k
R
Set Zero 1
5
IL
3
4
V+
V+
0V
0V
0V
2
0V
2
0V
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.
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.
Measuring a 4-20mA loop current.
R= Reading at 20mA
160
The meter's power supply must be
isolated from the 4-20mA current
loop.
7805
+5V
1
Ra=1M
I
1
V+
V
V supply
220nF
10uF
470nF
3
V+
COM
IH
4
S 1 A
Load
R L
R
4
5
IH
IL
V+
0V
2
IL
5
Rb=1k
Rs
R = 0.2
I FSR
3
COM
0V
2
0V
Shunt
Measuring supply voltage and current to a load.
S 1 selects between voltage and current measurement.
Measuring current.
The meter's supply is isolated
from the current being measured.
Ra and Rb shown scaled for 200V FSR
Rs = 200mV (e.g. 0.1 ? / 400mW for 2A full scale)
I FSR
Display DP1, DP2 or DP3, by connecting to 0V, as required.
Specifications liable to change without prior warning
SP 300
Issue 3
October/2001
M.C.
Applies to SP 300/1
www.martelcorp.com
Page 4 of 4
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com Page 4 of 4
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