Lascar EMV 1025S-01 Data Sheet

EMV 1025S-0 1 Single Hole Mounting Meter

EMV 1025S-0 1 is an easy to mount LCD digital voltmeter. It features 200mV full scalereading,
only 3 wiresto connect. The userneed only drill asingle 5.5mm / " hole inthe panel. The module is
the hole, adding the washer and tightening the nut provided. The module's connections pass through the hollow stud into the target application.
included, providing splashproof protectionfor the unit when fitted to the meter during installation.
This datasheet also refers to OEMvariants,referredtoasEMV1025S-X X, where X X refers to the factory-configured scalinganddecimalconfigurationoptions.

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auto-zero and auto-polarity. Installation time is greatly reduced with

fitted to thepanel by locating itsscrewthreaded stud through

A rubber seal is

Single Hole Mounting

12.5mm / 0.5" LCD Digit Height

200mV Full Scale Reading

-

-

-

3-Wire Connection

Auto-zero, Auto-polarity

Low Battery Warning

Splashproof

Stock Numbers*

EMV 1025S-X X

Range Decimal Point
0=200mV 0=NO DP
1=2V 1=DP1
2=20V 2=DP2
3=200V** 3=DP3

e.g.: EMV 1025S-1 3 2Vd.c. full scale, DP3 displayed

For modules manufactured to your scaling requirements,
contact Lascar direct.*
* Minimum order quanitity of 50 pcs. applies.
** Maximum allowable input voltage is 60Vd.c.

(1.999)

Specifications Min. Typ. Max. Unit

Accuracy (overall error)* 0.1 % (±2 counts)
Linearity ±1 count
Displayed reading -1999 1999
Resolution 0.1 mV d.c.
Sample rate 3 sample/sec
Operating temperature range 0 50 °C
Temperature stability 100 ppm/°C
Supply voltage 3.5 5 7.0 V d.c.
Supply current 250

* To ensure maximum accuracy, recalibrate periodically.

Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and
are tested with the module configuredforfullyfloatinginputmode.

1

A supply clock

Shown Actual Size

mA

DIMENSIONS All dimensions in mm (inches)

31 (1.22)

14.5

(0.57)

DP3 DP2 DP1

10.5
(0.41)

10.5
(0.41)

REAR VIEW

CAL

22.0 (0.87)

Module thickness 5.5mm (0.22)

22.0 (0.87)

5.00
(0.20)

EMV 1025S-X X

5.5 (0.2)

FITTING THE EMV 1025S-0 1

Drill a 5.5mm / " hole in the panel.
module to the panel by passing its screw threaded stud through the hole, fitting the
washer and tightening the nut provided. Do
damage the meter.

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www.lascarelectronics.com

Seal

Panel

9.0

(0.35)

Washer

Fit seal to the rear of the module. Fit the

3 Wires - 30cm (12.0)

Nut

not to overtighten the nut as this may

LASCAR ELECTRONICS LTD.

MODULE HOUSE, WHITEPARISH,

WILTSHIRE SP5 2SJ

TEL: [phone] FAX: [phone]

E-MAIL: [e-mail]

UK

LASCAR ELECTRONICS INC.

4258 WEST 12th STREET,

ERIE, PA 16505

TEL: [phone] FAX: [phone]

E-MAIL: [e-mail]

USA

LASCAR ELECTRONICS (HK) LTD.

8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN

ROAD, KWUN TONG, KOWLOON, HONG KONG

TEL: [phone] FAX: [phone]

E-mail: [e-mail]

TERMINAL FUNCTIONS

1. Red V+ Positive powersupplyconnection.

2. Black GND Negativepower supply connection.

3. Yellow IN HI Positivemeasuring input with reference toGND.

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 unit into the user ’s equipment conforms to the relevant sections of B S EN 61010 (Safety
Requirements for Electrical EquipmentforMeasuring,ControlandLaboratoryUse).

VOLTAGE SCALING

Two resistors Ra and Rb may be added in order
to alter the full scale reading (FSR) of the meter ­see table and diagrams below. The meter may
be re-calibrated by adjusting the calibration
potentiometer at the rear of the module.

Required V Ra Rb

2V* 910k 100k
20V* 1M 10k
200V* 1M 1k

FSR

WW
WW
WW

* Subject to a minimum order quantity of 50
pcs., pre-scaled modules are available from
Lascar. See stock number table on the front of
this datasheet.Customer-specific scaling options
may alsobeavailable on request. Contact Lascar
sales officefor details.

CURRENT SCALING

A current shunt Rs may be added in order to
alter the full scale reading (FSR) of the meter ­see table and diagrams below. The meter may
be re-calibrated by adjusting the calibration
potentiometer at the rear of the module.

Required I Rs P

FSR

200uA 1k 0.04mWW
2mA 100 0.4mW
20mA 10 4mW
200mA 1 40mW
2A 100m 400mW
20A 10m 4W
200A 1m 40W

W

W

W

W**

W**

W

(Power Rating)

** We recommend that purpose made shunts
are usedfor theseranges.

APPLICATIONS

Do not connect morethan one meter to the same power supply if the meters cannot use the same signal ground. Do notconnect IN HI to a voltage greater than
(V+ - 1V )or to a voltage lower than (-(V+) + 1V) if the meter is unscaled, as this may damage the meter. Keep leads short to ensure noise-free operation. To
maximise measurement accuracy, use high precision(1%),lowtemperaturedrift(50ppm/°Cor better) scaling resistors (Ra, Rb and Rs).

V+

Supply Voltage

0V

V

supply

(8-30V)*

7805

220nF 470nF

Measuring current.

+5V

GND

I

V+

Load

IN HI

Rs

Rs = V

FSR

I

FSR

Vin

Voltage to be

measured

0V

Ra

+3.5 to +7.5V d.c.

V+

IN HI

Rb

GND

Measuring a single ended input
referenced to supply.

The module shown is an EMV1025S-02

=5k

Rs

Load

I

S selects betweenvoltageand current measurement

1

Voltage: Ra,RbandRcal scale the module for 20V

R

L

Current: Rs = 200mV (e.g . 10m / 4W for =20A)

I

Calibration:
First calibrate the current range, by adjusting the meter's own calibration
potentiometer. Then calibrate the voltage range, by adjusting the R
potentiometer.

FSR

W I

FSR

.54

CAL

V

supply

(8-30V)*

7805

220nF 470nF

+5V

Measuring supply voltage and current.

V+

GND

IN HI

Ra=1M

A

S

1

V

Rb=8k

R

CAL

Shunt

* Consult 7805 voltage regulator manufacturer's datasheet for minimum and maximum allowable input voltage ratings.

Specifications liable to change without prior warning EMV 1025S-X X Issue 8 06/2010 IRCN 0539 S.L. Applies to EMV 1025S/1