SP 400-BLUE 3½ Digit Backlit LCD Voltmeter Module
PRODUCT DESCRIPTION
The SP 400-BLUE features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user selectable.
The SP 400-BLUE features a negative rail generator which enables the meter tomeasure a signal referencedto its own powersupply
GND. Blue
using the fixing clip provided. The module's
meter's housing ensures splash proofing using the supplied seal.
FEATURES
9.75mm (0.38") Digit Height
•
• 200mV d.c. Full Scale Reading
• 3.0 to 7.5V or 6.0 to 15.0V Operation
•
Auto-zero and Auto-polarity
•
Programmable Decimal Points
• Blue
• Low Battery Warning
• Splash Proof
LED backlighting ensures excellent readability under low light conditions. The module is easily fitted into the panel,
low cost means it will suit high and low volume applications. The design of the panel
LED Backlighting
TYPICAL APPLICATIONS
• Precision Instrumentation Systems
• Power Supply Monitoring
ORDERING INFORMATION
Stock Number
Standard Meter SP 400-BLUE
• Test Boxes
• Panel-Mount Indication
• Low Power Voltage Measurement
ELECTRICAL SPECIFICATIONS
Specification Min. Typ. Max. Unit
Accuracy (overall error) * 0.1 % (±1 count)
Linearity ±1 count
Sample rate 2.5 samples/sec
Operating temperature range 0 50 °C
Temperature stability 100 ppm/°C
Supply voltage V+ to GND configuration 3.0 5.0 7.5 V d.c.
Supply current V+ to GND configuration 350 A
Backlight supply voltage 7.5*** 8.0 V d.c.
Backlight supply current @ 7.5V d.c. 9**** mA
Input leakage current (Vin = 0V) 1 10 pA
* To ensure maximum accuracy, re-calibrate periodically.
** Operation of the meter beyond the maximum supply voltage rating may cause permanent damage to the meter.
*** An external series resistor is required above 7.5V, see Applications.
**** This specification linearly derates to 5mA @ 50°C.
Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and are tested with the module configured for single ended
input mode.
V+ to V- configuration 6.0 9.0 15.0** V d.c.
m
V+ to V- configuration
A supply clock
175 A
m
SAFETY
To comply with theLow Voltage Directive (LVD 93/68/EEC), input voltagesto the module’s pins must not exceed
60Vdc. The user mustensurethatthe incorporation of the panel meterintotheuser’s equipment conforms tothe
relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and
Laboratory Use).
LASCAR ELECTRONICS LTD.
MODULE HOUSE
WHITEPARISH
WILTSHIRE SP5 2SJ
UK
TEL: +44 (1794) 884567
FAX: +44 (1794) 884616
E-mail: sales@lascar.co.uk
LASCAR ELECTRONICS INC.
3750 WEST 26th STREET
ERIE
PA 16506
USA
TEL: +1 (814) 835 0621
FAX: +1 (814) 838 8141
E-mail: us-sales@lascarelectronics.com
www.lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. BLDG.
63-65 HUNG TO ROAD
KWUN TONG KOWLOON
HONG KONG
TEL: +852 2797 3219
FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
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SP 400-BLUE 3½ Digit Backlit LCD Voltmeter Module
DIMENSIONS
All dimensions in mm (inches)
a. 0.75 (0.03)
b. 10.00 (0.39)
c. 6.00 (0.24)
ab c
22.4 (0.88)
35.1 (1.38)
PANEL FITTING
Module Seal
34 (1.34)
21.3 (0.84)
Panel thickness: 1.0 - 3.0
Panel
(0.04 - 0.12)
6.76 (0.27)
20.5 (0.81)
2.54 (0.1) pitch
33.0 (1.30)
Fixing Clip
4.27 (0.17)
4.22 (0.17)
0.64 (0.03)
1
2
FUNCTIONAL BLOCK DIAGRAM
V+
Vref
CAL
BL-
INH
INL
+
_
A/D
V-
DP321GND
8
1
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3 4
PIN CONFIGURATION
INH
LBAT
INL
DP1
DP2
LCOM
CAL
19
BL-
V+
GND
(rear view)
V-
DP3
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SP 400-BLUE 3½ Digit Backlit LCD Voltmeter Module
CIRCUIT DIAGRAM
RA and RB factory fitted options
Pins 11 and 18 not fitted as standard
PIN FUNCTIONS
1. V+ Positive power supply to the meter.
2. GND 0Vpower supply to the meter (3.0 to 7.5V meterpower supply applications only).
3. BL- Connectto the meter's negative supply voltage to switch on theLED backlighting.
Formeter supply voltages above 7.5V, add a series resistor Rs.
See Applications for suitablecircuit diagrams.
4. INH Positive measuring input.
5. INL Negative measuring input.
6. DP1 Connect to V+ todisplay DP1 (199.9).
7. DP2 Connect to V+ todisplay DP2 (19.99).
8. DP3 Connect to V+ todisplay DP3 (1.999).
9. V- Negative power supply tothe meter (6.0 to 15.0V meter power supply applications only).
Note:
A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then
the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as
that of the panelmeter, then the limitations onthe input range are(V-+ 1.5V) to (V+ - 1.5V).
Solder Links:
LCOM Normally Open. Connects INL to COM.
LBAT Normally Closed. Cut thislink to disable thelow battery warning sign.
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SP 400-BLUE 3½ Digit Backlit LCD Voltmeter Module
SCALING
Two external resistors Ra
and Rb may be used to
alter the full scale reading
Voltage
(FSR) of the meter - see
table. The meter will have
to be re-calibrated by
adjusting the calibration
Current
potentiometer on the rear
of the module.
*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 inputbeyond the power supply rails will damagethe meter.
5V supply operation (3.0 to 7.5V Meter Power Supply)
FSR Ra Rb
2V 910k 100k
20V 1M 10k
200V 1M 1k
2000V* 1M 100R
200 A 0R 1k
m
2mA 0R 100R
20mA 0R 10R
200mA 0R 1R
+
Vin or inI
-
Ra
4
Rb
5
INH
INL
SP 400-BLUE
+3.0 to +7.5V
+
±200mV
-
1
V+
4
INH
5
INL
GND
6
DP1
7
DP2
8
DP3
2
+3.0 to +7.5V
±200mV
No DP
+
4
-
5
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.
9V supply operation (6.0 to 15.0V Meter Power Supply)
+3.0 to +7.5V
+
±200mV
-
-3.0 to -7.5V
1
V+
4
INH
3
BL-
5
INL
V-
9
+6.0 to +15.0V
+
±200mV
-
Rs=(V+) - (V-) - 7.5V
0.01
4
5
INH
INL
INH
INL
V+
GND
V+
V-
1
3
BL-
2
+3.0 to +7.5V
I+
Rb
I-
if V+<7.5V then
backlight may appear
dull or not switch on.
4
INH
5
INL
0V
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.
1
+6.0 to +15.0V
I+
BL-
3
Rb
I-
Rs=(V+ - 7.5V)
9
0.01
0V
V+
GND
4
INH
5
INL
1
BL-
2
Rs=(V+) - (V- ) - 7.5V
0.01
3
Rs
0V
1
V+
V-
9
0V
ext
V-
ext
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.
Specifications liable to change without prior warning SP 400-BLUE Issue 1 February/2004 M.C. Applies to SP 400/3
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.
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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.
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