Digit Voltmeter Module features 200mV d.c. measurement range with

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Digit Voltmeter Module features 200mV d.c. measurement range with

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Digit Voltmeter Module
features 200mV d.c. measurement range with auto-zero auto-polarity. Decimal points user selectable. features negative rail generator which enables meter measure signal referenced power supply bright display ensures excellent readability under light conditions. blanked applications requiring power operation. module easily fitted into panel, using fixing clip provided. module's cost means will suit high volume applications. design panel meter's housing seal ensures splash proofing many applications.
FEATURES
9.4mm (0.37") Digit Height 200mV d.c. Full Scale Reading 50mA d.c. Power Supply Auto-zero Auto-polarity Programmable Decimal Points Bright 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
ELECTRICAL SPECIFICATIONS
Specification
Accuracy (overall error) Linearity Sample rate Operating temperature range Warm-up time Temperature stability Supply voltage Supply current connected Supply current connected Input leakage current (Vin ensure maximum accuracy, re-calibrate periodically.
Min.
Typ.
Max.
Unit
count) count samples/sec minute ppm/°C
4.75
5.25
SAFETY
comply with Voltage Directive (LVD 93/68/EEC), input voltages module's pins must exceed 60Vdc. user must ensure that incorporation panel meter into user's equipment conforms relevant sections 61010 (Safety Requirements Electrical Equipment Measuring, Control Laboratory Use).
LASCAR ELECTRONICS LTD. MODULE HOUSE WHITEPARISH WILTSHIRE TEL: (1794) 884567 FAX: (1794) 884616 E-mail: sales@lascar.co.uk
www.lascarelectronics.com
770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com Page
LASCAR ELECTRONICS INC. 50727 PALO ALTO 94303-0727 TEL: (650) 9027 FAX: (650) 5432 E-mail: lascarus@pacbell.net
LASCAR ELECTRONICS (HK) LIMITED FLAT 5/FL., LUCKY FTY. BLDG. 63-65 HUNG ROAD KWUN TONG KOWLOON HONG KONG TEL: +852 2797 3219 FAX: +852 2343 6187 E-mail: b4lascar@samsongroup.com.hk
DIMENSIONS
dimensions (inches)
Digit Voltmeter Module
27.9 (1.10)
21.3 (0.84)
22.4 (0.88)
20.5 (0.81)
33.0 (1.30)
(1.34
35.0 .38)
Panel thickness: (0.04 0.12)
0.75 (0.03) 10.00 (0.39) 6.00 (0.24) 2.54 (0.10)
PANEL FITTING
Panel
Module
Seal
Fixing Clip
CONFIGURATION
FUNCTIONAL BLOCK DIAGRAM
(rear view)
Vref
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Page 770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com
CIRCUIT DIAGRAM
Digit Voltmeter Module
FUNCTIONS
Positive power supply meter. Display Enable. Connect normal operation. connect enter power mode. display then blanked, voltmeter section continues operate. power mode, current consumption reduced 400µA (typ). power supply connection meter. Connect display (199.9). Connect display (19.99). Connect display (1.999). Reference voltage input meter's converter. Precision reference voltage output. Connect normal operation. Connect test display. segments will displayed, except decimal points. Ground analogue section converter. actively held 3.05V (nom) below must allowed sink excessive current (>100µA) instance, connecting higher voltage. Positive measuring input. Negative measuring input. Note: negative supply generated internally mirrors positive supply. example: +5V, then internally generated -5V. When measuring with input referenced same supply rail that panel meter, then limitations input range 1.5V) 1.5V).
770, Londonderry, 03053 1-800-821-0023 Page www.lascarelectronics.com www.martelcorp.com
SCALING
resistors used alter full scale reading (FSR) meter table. meter will have recalibrated adjusting calibration potentiometer rear module.
Voltage 200V 2000V* 200µA 20mA 200mA 910k** 1M** 1M** 1M** 100k 100R 100R
Digit Voltmeter Module
Current
Ensure that rated high voltage use. Ensure solder link cut.
APPLICATIONS
connect more than meter same power supply meters cannot same signal ground. Taking input beyond power supply rails will damage meter.
220k
Zero
±200mV
±200mV
4-20mA current loop
Measuring input voltage referenced floating supply, i.e. input voltage meter's power supply isolated from each other.
Measuring single ended input voltage referenced supply, i.e. input voltage meter's power supply share same rail.
Measuring 4-20mA loop current. Reading 20mA meter's power supply must isolated from 4-20mA current loop.
7805
Ra=1M
10uF
Load
Vsupply
220nF
470nF
Rb=1k
IFSR
Shunt
Measuring supply voltage current load. selects between voltage current measurement. 200mV (e.g. 400mW full scale) IFSR Display DP1, DP3, connecting required. shown scaled 200VFSR
Measuring current. meter's supply isolated from current being measured.
Specifications liable change without prior warning
Issue
October/2001
M.C.
Applies 100/1
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Page 770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com

Digit Voltmeter Module features 200mV d.c. measurement range with

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