OEM 1B
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3½ Digit LCD Voltmeter Module
PRODUCT DESCRIPTION
The OEM 1B uses the latest miniaturisation techniques to produce a very compact 3 ½ digit LCD voltmeter. It is
designed to be a drop-in component in most medium and high volume applications, ranging from personal
instrumentation and integral sensor indicators to measurement probes. The meter features 8mm digit height, 3
decimal points, auto-polarity, auto-zero, 200mV full scale reading and a very low current consumption.
Connection tothe module is via two dual in line rows of pins.
FEATURES
•8
mm (0.31") Digit Height
• 200mV d.c. Full Scale Reading
• 150 A @ 7.5 to 14V Operation
µ
•
Auto-zero and Auto-polarity
• Selectable
• Very Compact Design
Decimal Points
TYPICAL APPLICATIONS
• Personal Gas Monitoring
• Medical Instruments
ORDERING INFORMATION
Stock Number
Standard Meter OEM 1B
• Measurement Probes
• Hand held instruments
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 V-)
Supply current 150 Aµ
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.
Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and are tested with the module configured for floating input
mode.
A supply clock
7.5 9 14** V d.c.
+
SAFETY
Tocomply 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
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
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
PO Box 770, Londonderry, NH 03053 1-800-821-0023
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www.martelcorp.com
www.lascarelectronics.com
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OEM 1B
DIMENSIONS
All dimensions in mm (inches)
3½ Digit LCD Voltmeter Module
13.4 (0.53)
23.4 (0.92)
0.2(0.01)+
17.8 (0.70)
0.4(0.02)+
16.4 (0.65)
5.3 (0.21)
5.5 (0.22)
6.35
(0.25)
5.5
(0.22)
CAL
5.0
(0.20)
1.27 (0.05)
12.7 (0.50)
2.54 (0.10)
FUNCTIONAL BLOCK DIAGRAM
V+
RHI
COM
RLO
INI
ILO
CAL
+
Vref
_
A/D
V-
1
DP321
XDP
8
PO Box 770, Londonderry, NH 03053 1-800-821-0023
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www.martelcorp.com
PIN CONFIGURATION
DP3
DP2
DP1
NC
RHI
CAL
COM
ILO
V+
IHI
RLO
(rear view)
XDP
V-
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OEM 1B
CIRCUIT DIAGRAM
3½ Digit LCD Voltmeter Module
NC
PIN FUNCTIONS
1. V- Negative power supply to the meter.
2. V+ Positive power supplyto the meter.
3. IHI Positivemeasuring input.
IHI must be no closer than1.6V to eitherthe positive ornegative supply,when using the
internal 100mV reference.
4. ILO Negative measuring input.
ILO must be no closer than1.6V to eitherthe positive ornegative supply,when using the
internal 100mV reference.
5. COM
6. RLO Negative input for the reference voltage.
7. RHI Positiveinput for the reference voltage.
8. NC Do not connect.
9. DP1 Connect to XDP to display DP1(199.9).
10. DP2 Connect to XDP to display DP2(19.99).
11. DP3 Connect to XDP to display DP3(1.999).
12. XDP Connectto DP1, DP2 or DP3 to display required decimal points.
Ground for the analogue section ofthe A/D converter.It is actively held at 3.05V(nom.) below
V+ and must not be allowedto sink excessivecurrent (>100mA) by,for instance, connecting
to a higher voltage.
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PO Box 770, Londonderry, NH 03053 1-800-821-0023
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OEM 1B
3½ Digit LCD Voltmeter Module
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 recalibrated by adjusting the
calibration potentiometer
on the rear of the module.
Voltage
Vin 200V 1M 1k
Current
Iin 20mA 0R 10R
*Ensure that Ra is rated for high voltage use.
FSR Ra Rb
2V 910k 100k
20V 1M 10k
2000V* 1M 100R
200 A 0R 1k
µ
2mA 0R 100R
200mA 0R 1R
+
Vin or inI
-
Ra
Rb
IHI
OEM 1B
ILO
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.
3
+
±200mV
Measuring a floating voltage
source of 200mV full scale.
+
-
R=0.2
Measuring current.
Supply MUST be isolated.
4
-
5
6
3
5
--
R
6
4
FSR
I
IHI
ILO
COM
RLO
IHI
COM
RLO
ILO
V+
V-
V+
V-
V+
COM
V-
2
RLO
1
V+
5
6
V-
V+
2
+
±200mV
-
3
4
0V
1.6V
1
V-
V+
2
1
V-
min.
Split supply operation.
I
IN
100K
SET
2K
6R2
I
OUT
Measuring 4-20mA to read 0-999.
Supply MUST be isolated.
ZERO
IHI
ILO COM
3
IHI
4
ILO
6
RLO
5
COM
V+
V-
V+
V-
2
RLO
1
2
1
V+
V-
V+
510K
3
5
14V max
7V min
6
SUPPLY
VOLTAGE
10K
510K
IHI
4
ILO
V-
Measuring a supply voltage.
(min. 7.5V, max. 14V).
Specifications liable to change without prior warning OEM 1B Issue 2 September/2002 M.C. Applies to OEM 1B/3
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PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com
www.martelcorp.com
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