Lascar EM32-1 Data Sheet

EM32-1B

Round Hole Mounting LCD Voltmeter

PRODUCT DESCRIPTION

The EM32-1B isa3½digit LCD voltmeter which is designed to be panel mounted in most low and medium
volume applications. The meter features 8mm digit height, 3 decimal points, auto-polarity,auto-zero, 200mV full
scale reading and a very low current consumption. This product is designed so no soldering is required.
Connection is via screw terminals, andoptionsare selected via jumper links. The module features aroundmetal
bezel, requiringa 32.5mm (1.28") diameter cut-out. It is secured with the nut provided. Protection fromthe front
to IP 67 / NEMA 4X standards is achieved by placing the rubber seal between the module and panel during
assembly.

FEATURES

•8

mm (0.31") Digit Height

• 200mV d.c. Full Scale Reading

• 3.5 to 6.5V or 7.5 to 14.0V Operation

•

Auto-zero and Auto-polarity

• Selectable

• Requires 32.5mm (1.28") Diameter Cut-out

• IP67 / NEMA 4X Protected

Decimal Points

TYPICAL APPLICATIONS

• Panel Mount Instrumentation

• Process & Control

• Automotive

ORDERING INFORMATION

Stock Number

Standard Meter EM32-1B

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 L1 in default configuration 3.5

Supply current L1 in default configuration 500 A

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.

L1 re-configured 7.5 9.0 14.0** V d.c.

L1 re-configured Amm

A supply clock

5.0 6.5** V d.c.

150

+

SAFETY

Tocomply with the Low Voltage Directive (LVD 93/68/EEC), input voltages tothemodule’s pins must not exceed
60Vdc. The user must ensure that the incorporation of the panel meter into the user’sequipmentconforms 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: [phone]
FAX: [phone]
E-mail: [e-mail]

LASCAR ELECTRONICS INC.

4258 West 12th Street

Erie

PA 16505

USA
TEL: [phone]
FAX: [phone]

E-mail: [e-mail]

www.lascarelectronics.com

LASCAR ELECTRONICS (HK) LTD.

8th FLOOR, CHINA AEROSPACE CENTRE,

143 HOI BUN ROAD,

KWUN TONG, KOWLOON,

E- mail: [e-mail]

HONG KONG
TEL: [phone]
FAX: [phone]

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EM32-1B

DIMENSIONS

DIMENSIONS

All dimensions in mm (inches)

All dimensions in mm (inches)

1.7 (0.07)

1.5 (0.06)

Round Hole Mounting LCD Voltmeter

15.0 (0.59)

5.5 (0.22)

3.0 (0.12)

23.5 (0.93)

32.5
(1.28)

Panel cut-out

PANEL MOUNTING

38.0 (1.5)

32.0 (1.26)

23 41

FUNCTIONAL BLOCK DIAGRAM

V+

RHI

COM

RLO

J1

ILO

J2

0V

ILO IHI V+ 0V

IHI

+

_

Vref

CAL

A/D

V+ V-

Neg Rail

Generator

8

1

DP 3 2 1

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CONNECTIONS (rear view)

IHI

V+

J2

L1

0V

RA

J1

ILO

RB

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EM32-1B

CIRCUIT DIAGRAM

V+

Round Hole Mounting LCD Voltmeter

IHI

ILO

0V

Ra

RB

J1

J2

8

7

2

IC2

C1'

4

1.5uF

L1

7660

6

5

C2'

1.5uF

3

PIN FUNCTIONS

0V Negative powersupplytothe meter.
V+ Positive power supply to the meter.
IHI Positive measuring input.

IHI must beno closer than 1.5V to either the positive or negative supply.

ILO Negative measuring input.

ILO must beno closer than 1.5V to either the positive or negative supply.

JUMPER LINKS

J1 Connects ILO toCOM, when jumper link is fitted.
J2 Connects ILO to0V, when jumperlink is fitted.

Solder LINK L1

Solder Link L1 is used to select to power supply mode of the
EM32-1B.

WithL1 inthe default configuration, themodule operates from a

3.5 to 6.5Vd.c. supply, and measurements can be made with
respect to powersupply 0V.

When L1 is re-configured, the module operates from a 7.5 to

14.0Vd.c supply. The voltage being measured must then be
floating with respectto the meter's power supply.

L1 L1

Default configuration Re-configured

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EM32-1B

Round Hole Mounting LCD Voltmeter

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 ofthe 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

m

200 A 0R 1k

2mA 0R 100R

200mA 0R 1R

+

Vin or inI

-

Ra

Rb

IHI

EM32-1B

ILO

APPLICATIONS

Do not connect more than one meter to the same power supply if the meters cannot use the same signal
ground. Taking anyinput beyond the power supplyrails willdamage the meter.

5V supply operation (3.5 to 6.5V Meter PowerSupply)

+3.5 to +6.5V

V+

+

IHI

±200mV

-

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.
Ensure jumper link J1 is not fitted.
Ensure jumper link J2 is not fitted.

ILO

0V

0V

+3.5 to +6.5V

+

IHI

±200mV

-

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.
Ensure jumper link J1 is fitted.
Ensure jumper link J2 is not fitted.

ILO

9V supply operation (7.5 to 14.0V Meter PowerSupply)

+3.75 to +7.0V

+

±200mV

-

V+

IHI

ILO

+7.5 to +14.0V

+

±200mV

-

IHI

ILO

V+

0V

V+

L1 =

0V

L1 =

+3.5 to +6.5V

V+

I+

Rb

I-

IHI

ILO

0V

0V

Measuring a current from a circuit which is
floating with respect to the meter's supply,
i.e. the current and the meter's power
supply are isolated from each other.
Ensure jumper link J1 is fitted.
Ensure jumper link J2 is not fitted.

+7.5 to +14.0V

V+

I+

Rb

I-

IHI

ILO

0V

-3.75 to -7.0V

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.
Ensure jumper link J1 is not fitted.
Ensure jumper link J2 is fitted.

Specifications liable to change without prior warning EM32-1B Issue 4 06/2010 S.L. Applies to EM32-1B/2

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.
Ensure jumper link J1 is fitted.
Ensure jumper link J2 is not fitted.

0V

0V

Measuring a current from a circuit which is
floating with respect to the meter's supply,
i.e. the current and the meter's power
supply are isolated from each other.
Ensure jumper link J1 is fitted.
Ensure jumper link J2 is not fitted.

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0V

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0V