SP300 Martel Electronics, SP300 Datasheet - Page 4

• Manufacturer Part Number: SP300
• Description: LED DPM 200MV 3.5 DIGIT RED
• Manufacturer: Martel Electronics
• Series: SPr
• Type: Voltmeterr

Specifications of SP300

• Measuring Range: 200mVDC
• Display Style: Red Characters, Black Background
• Display Type: LED
• Display Face Size: 1.38" L x 0.88" W (35.1 x 22.4mm)
• Display Digits: 3.5
• Display Digits - Height: 0.370" (9.40mm)
• Backlight: Red
• Mounting Type: Panel Mount
• Termination: PC Pins
• Voltage - Supply: 4.75 ~ 5.25V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 227-1052

SP 300
Specifications liable to change without prior warning
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.
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.
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.
V
S selects between voltage and current measurement.
Ra and Rb shown scaled for 200V
Display DP1, DP2 or DP3, by connecting to 0V, as required.
supply
1
±200mV
+
-
4
5
3
IH
220nF
IL
COM
Measuring supply voltage and current to a load.
V+
0V
7805
1
2
V+
0V
+5V
10uF
470nF
FSR
3
COM
* Ensure that Ra is rated for high voltage use.
** Ensure solder link LA is cut.
Rs = 200mV
Voltage
Current
V+
0V
1
2
IH
IL
www.lascarelectronics.com
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
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.
4
5
I
S
FSR
1
V
A
2000V* 1M**
±200mV
200mA
(e.g. 0.1 / 400mW for 2A full scale)
200 A
20mA
200V
2mA
20V
FSR
Ra=1M
Rb=1k
2V
+
-
SP 300
Shunt
Rs
910k**
1M**
1M**
4
5
Load
Ra
0R
0R
0R
0R
IH
IL
I
V+
0V
1
2
Issue 3
R
L
100k
100R
100R
0V
10R
V+
10k
Rb
1k
1k
1R
October/2001
3½ Digit LED Voltmeter Module
current loop
Vin or in
4-20mA
R = 0.2
Measuring current.
The meter's supply is isolated
from the current being measured.
+
-
I
I
R
FSR
Measuring a 4-20mA loop current.
The meter's power supply must be
isolated from the 4-20mA current
loop.
I
I-
+
LA
Ra
R= Reading at 20mA
220k
M.C.
R
4
5
3
5k
Rb
IH
IL
COM
V+
0V
Set Zero
1
2
5
3
4
160
4
5
IL
COM
IH
IH
IL
Applies to SP 300/1
V+
0V
SP 300
V+
0V
1
2
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0V
V+
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