SP 100
PRODUCT DESCRIPTION
3½ Digit LED Voltmeter Module
The SP 100 features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user
selectable. The SP 100 features a negative rail generator which enables the meter to measure a signal referenced to its
own power supply 0V. The bright red LED display ensures excellent readability under low light conditions. It can be
blanked in applications requiring low power operation. The module is easily fitted into the panel, using the fixing clip
provided. The module's low cost means it will suit high and low volume applications. The design of the panel meter's
housing and seal ensures splash proofing in many applications.
FEATURES
• 9.4mm (0.37") Digit Height
• 200mV d.c. Full Scale Reading
• 50mA @ +5V d.c. Power Supply
• Auto-zero and Auto-polarity
• Programmable Decimal Points
• Bright Red LED Display
• Display Blanking Facility
• Splash Proof
TYPICAL APPLICATIONS
• Precision Instrumentation Systems
• Power Supply Monitoring
• Test Boxes
• Panel-Mount Indication
ORDERING INFORMATION
Standard Meter
Stock Number
SP 100
ELECTRICAL SPECIFICATIONS
Specification
Accuracy (overall error) *
Linearity
Sample rate
Operating temperature range
Warm-up time
Temperature stability
Supply voltage
Supply current (DE connected to V+)
Supply current (DE connected to 0V)
Input leakage current (Vin = 0V)
* To ensure maximum accuracy, re-calibrate periodically.
Min.
Typ.
0.1
2.5
Max.
±1
Unit
% (±1 count)
count
samples/sec
°C
minute
ppm/°C
V
mA
µ
A
pA
0
10
150
5
50
400
1
50
4.75
5.25
90
10
SAFETY
To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed
60Vdc. The user must ensure that the incorporation of the panel meter into the user’s equipment conforms to the
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
www.lascarelectronics.com
PO Box 770, Londonderry, NH 03053 1-800-821-0023
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LASCAR ELECTRONICS INC.
PO BOX 50727
PALO ALTO
CA 94303-0727
USA
TEL: +1 (650) 838 9027
FAX: +1 (650) 833 5432
E-mail: lascarus@pacbell.net
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
SP 100
DIMENSIONS
All dimensions in mm (inches)
3½ Digit LED Voltmeter Module
27.9 (1.10)
a
b
c
21.3 (0.84)
22.4 (0.88)
20.5 (0.81)
d
33.0 (1.30)
34 (1.34
)
35.0 (1
.38)
Panel thickness: 1.0 - 3.0
(0.04 - 0.12)
a. 0.75 (0.03)
b. 10.00 (0.39)
c. 6.00 (0.24)
d. 2.54 (0.10)
PANEL FITTING
Panel
Module
Seal
Fixing Clip
1
2
3
PIN CONFIGURATION
4
FUNCTIONAL BLOCK DIAGRAM
V+
(rear view)
RO
COM
RI
INH
INL
0V
+
_
CAL
Vref
12
DE
T
A/D
1
7
8
INL
INH
COM
T
CAL
RO
RI
V+
DE
RB RA
0V
LA
DP3
DP2
DP1
1
6
DP1 2 3
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SP 100
CIRCUIT DIAGRAM
1
3½ Digit LED Voltmeter Module
2
11
12
10
7
5
0V
6
3
4
8
9
PIN FUNCTIONS
Positive power supply to the meter.
Display Enable. Connect to V+ for normal operation.
Do not connect to enter low power mode. The display is then blanked, but the voltmeter section
continues to operate. In low power mode, the current consumption is reduced to 400
µ
A (typ).
3. 0V
0V power supply connection to the meter.
4. DP3 Connect to 0V to display DP3 (199.9).
5. DP2 Connect to 0V to display DP2 (19.99).
6. DP1 Connect to 0V to display DP1 (1.999).
7. R I
Reference voltage input for the meter's A/D converter.
8. RO
Precision reference voltage output. Connect to RI for normal operation.
9. T
Connect to V+ to test the display. All segments will be displayed, except for decimal points.
10. COM Ground for analogue section of A/D converter.
It is actively held at 3.05V (nom) below V+ and must not be allowed to sink excessive current
(>100
µ
A) by, for instance, connecting to a higher voltage.
11. INH Positive measuring input.
12. INL Negative measuring input.
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 panel meter, then the limitations on the input range are (V- + 1.5V) to (V+ - 1.5V).
1.
2.
V+
DE
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SP 100
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
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
3½ Digit LED Voltmeter Module
LA
+
11
Ra
INH
Vin or
I
in
Rb
12
SP 100
INL
Current
I
in
-
* 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.
1
V+
1
V+
220k
DE
2
8
Set Zero
1
V+
2
8
+
±200mV
11
12
10
V+
INH
DE
INL
COM
0V
3
2
8
+
±200mV
11
12
V+
INH
INL
V+
INL
10
COM
11
12
5k
4-20mA
current loop
DE
-
RO
7
RI
-
I
+
R
RO
7
RI
0V
3
RO
7
RI
I-
INH
0V
3
0V
0V
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
I
Ra=1M
DE
INH
2
11
1
V+
V+
10uF 10
COM
V
Load
11
V+
INH
DE
INL
COM
0V
3
2
8
V
supply
220nF
R
L
8
RO
470nF 7
RI
S
1
A
12
R
12
10
INL
0V
3
Rb=1k
Rs
RO
7
RI
R = 0.2
I
FSR
0V
Shunt
Measuring supply voltage and current to a load.
S
1
selects between voltage and current measurement.
Rs = 200mV
(e.g. 0.1
Ω
/ 400mW for 2A full scale)
I
FSR
Display DP1, DP2 or DP3, by connecting to 0V, as required.
Ra and Rb shown scaled for 200V
FSR
Measuring current.
The meter's supply is isolated
from the current being measured.
Specifications liable to change without prior warning
SP 100
Issue 3
October/2001
M.C.
Applies to SP 100/1
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