Martel Electronics SP200 User Manual

SP 200

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3½ Digit Backlit LCD Voltmeter Module

PRODUCT DESCRIPTION

The SP 200 features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user
selectable.
own power supply GND.
easily fitted into the panel, using the fixing clip provided. The module's

The SP 200 features a negative rail generator which enables the meter to measure a signal referenced to its

LED backlighting ensures excellent readability under low light conditions. The module is

low cost means it will suit high and low volume

applications. Thedesign of the panel meter's housing ensures splash proofing using the supplied seal.

FEATURES

•

9.75mm (0.38") Digit Height

• 200mV d.c. Full Scale Reading

• 350 A @ +5V d.c. Power Supply

µ

•

Auto-zero and Auto-polarity

•

Programmable Decimal Points

•

LED Backlighting

• Low Battery Warning

• Splash Proof

TYPICAL APPLICATIONS

• Precision Instrumentation Systems

• Power Supply Monitoring

ORDERING INFORMATION

Stock Number

Standard Meter SP 200

• Test Boxes

• Panel-Mount Indication

• Low Power Voltage Measurement

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 3.5 5 5.25 V
Supply current 350 A
Backlight current @ 5V d.c. mA
Input leakage current (Vin = 0V) 1 10 pA

* To ensure maximum accuracy, re-calibrate periodically.

40 80

µ

SAFETY

To comply with the Low Voltage Directive (LVD93/68/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 conformsto 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.
PO BOX 50727
PALO A LTO
CA 94303-0727
USA
TEL: [phone]
FAX: [phone]
E-mail: [e-mail]

PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com

www.lascarelectronics.com

LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. BLDG.
63-65 HUNG TO ROAD
KWUN TONG
KOWLOON
HONG KONG
TEL: [phone]
FAX: [phone]
E-mail: [e-mail]

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SP 200

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DIMENSIONS

All dimensions in mm (inches)

3½ Digit Backlit LCD Voltmeter Module

22.4 (0.88)

35.0 (1.38)

PANEL FITTING

Module Seal

34 (1.34)

21.3 (0.84)

Panel thickness: 1.0 - 3.0

Panel

(0.04 - 0.12)

20.5 (0.81)

27.9 (1.10)

33.0 (1.30)

Fixing Clip

adbc

a. 0.75 (0.03)
b. 10.00 (0.39)
c. 6.00 (0.24)
d. 2.54 (0.10)

1

2

FUNCTIONAL BLOCK DIAGRAM

V+

RO

COM

Vref

CAL

BL

RI

INH

+

_

A/D

8

1

INL

DP123GND

PO Box 770, Londonderry, NH 03053 1-800-821-0023

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www.martelcorp.com

3 4

PIN CONFIGURATION

12

INL
INH
COM
BL
RO

CAL

RI

7

V+
NC

GND

DP3
DP2

DP1

(rear view)

1

6

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SP 200

CIRCUIT DIAGRAM

1

2

11

12

10

7

3

3½ Digit Backlit LCD Voltmeter Module

6

5

4

8

PIN FUNCTIONS

1. V+ Positive power supply to the meter and LED backlighting.

2. NC Not connected.

3. GND 0V power supply connection to the meter.

4. DP3 Connect to GND to display DP3 (199.9).

5. DP2 Connect to GND to display DP2 (19.99).

6. DP1 Connect to GND to display DP1 (1.999).

7. R I Reference voltage input for the meter's A/D converter.

8. RO Precision reference voltage output. Connect to RI for normal operation.

9. BL Connect to GND to switch on the LED backlighting.

10. COM Ground for analogue section of A/D converter.
It is actively held at 2.8V below V+ and must not be allowed to sink excessive current

µ

(>100 A) by, for instance, connecting to a higher voltage.

11. IH Positive measuring input.
IH must be no closer than 1.5V to either the positive or negative supply.

12. IL Negative measuring input.
IL must be no closer than 1.5V to the positive supply.

9

Note:
A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then

the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as
that of the panel meter, then the limitations on the input range are (V-+1.5V)to (V+ - 1.5V).

PO Box 770, Londonderry, NH 03053 1-800-821-0023

www.lascarelectronics.com

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www.martelcorp.com

SP 200

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3½ Digit Backlit 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

I

in 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

11

12

INH

SP 200

INL

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.

V+

1

V+

11

12

INH

INL

7805

RO

RI

GND

3

+5V

10uF

+

±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.

V

supply

220nF 470nF

Measuring supply voltage and current to a load.
Display DP1, DP2 or DP3 by connecting to GND, as required.

8

7

0V

1

V+

11

+

±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.

1

V+

10

8

7

COM

RO

RI

INH

INL

GND

3

INH

RO

12

INL

10

COM

GND

3

Ra=1M

V

11

S

1

A

12

Rb=1k

Rs

Shunt

V+

RI

8

7

0V

I

Load

220k

Set Zero

5k

I-

4-20mA

I

Measuring a 4-20mA loop current.
The meter's power supply must be isolated
from the 4-20mA current loop.

R

L

S selectsbetweenvoltage and current display.

1

Ra and Rb shown scaled for 200V .
Rs = 200mV (e.g. 0.1 for 2A range)

R

+

R= Reading at 20mA

160

I

12

10

11

Ω

1

V+

INL

COM

RO

INH

GND

3

FSR

V+

RI

8

7

0V

Specifications liable to change without prior warning SP 200 Issue 3 October/2001 M.C. Applies to SP 200/1

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PO Box 770, Londonderry, NH 03053 1-800-821-0023

www.lascarelectronics.com

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www.martelcorp.com