Digit Backlit Voltmeter Module features 200mV d.c. measurement ra
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Digit Backlit 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 GND. backlighting ensures excellent readability under light conditions. module easily fitted into panel, using fixing clip provided. module's cost means will suit high volume applications. design panel meter's housing ensures splash proofing using supplied seal.
FEATURES
9.75mm (0.38") Digit Height 200mV d.c. Full Scale Reading 350µA d.c. Power Supply Auto-zero Auto-polarity Programmable Decimal Points Backlighting Battery Warning Splash Proof
TYPICAL APPLICATIONS
Precision Instrumentation Systems Power Supply Monitoring Test Boxes Panel-Mount Indication Power Voltage Measurement
ORDERING INFORMATION
Standard Meter Stock Number
ELECTRICAL SPECIFICATIONS
Specification
Accuracy (overall error) Linearity Sample rate Operating temperature range Temperature stability Supply voltage Supply current Backlight current d.c. Input leakage current (Vin ensure maximum accuracy, re-calibrate periodically.
Min.
Typ.
Max.
Unit
count) count samples/sec ppm/°C
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
770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com Page www.lascarelectronics.com
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 Backlit 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)
0.75 (0.03) 10.00 (0.39) 6.00 (0.24) 2.54 (0.10) Panel thickness: (0.04 0.12)
PANEL FITTING
Panel
Module
Seal
Fixing Clip
CONFIGURATION
FUNCTIONAL BLOCK DIAGRAM
(rear view)
Vref
www.lascarelectronics.com
Page 770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com
CIRCUIT DIAGRAM
Digit Backlit Voltmeter Module
FUNCTIONS
Positive power supply meter backlighting. connected. 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 switch backlighting. Ground analogue section converter. actively held 2.8V below must allowed sink excessive current (>100µA) instance, connecting higher voltage. Positive measuring input. must closer than 1.5V either positive negative supply. Negative measuring input. must closer than 1.5V positive supply.
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).
www.lascarelectronics.com
770, Londonderry, 03053 1-800-821-0023 Page 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
Digit Backlit Voltmeter Module
Current
100k 100R 100R
*Ensure that rated high voltage use.
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
I4-20mA
Reading 20mA
Measuring single ended input voltage referenced supply, i.e. input voltage meter's power supply share same rail.
Measuring input voltage referenced floating supply, i.e. input voltage meter's power supply isolated from each other.
Measuring 4-20mA loop current. meter's power supply must isolated from 4-20mA current loop.
7805
Ra=1M
Load
Vsupply
220nF
10uF
470nF
Rb=1k
selects between voltage current display. shown scaled 200VFSR. 200mV (e.g. range)
Shunt
Measuring supply voltage current load. Display DP1, connecting GND, required.
Specifications liable change without prior warning
Issue
October/2001
M.C.
Applies 200/1
www.lascarelectronics.com
Page 770, Londonderry, 03053 1-800-821-0023 Page www.martelcorp.com
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