LASCAR DPM200 User Manual

DPM 200 3½ Digit LCD Module

The DPM 200 uses advanced components and construction techniques to provide an unrivalled combination of high performance,
elegant appearance andlow cost. The module usesa bandgapreference for extratemperature stability. Forsingle railuse, the DPM200S
features a builtin negativerail generator,enabling the meter tomeasure a signal referencedto itsown power supply0V.

15mm (0.6“) Digit Height

Programmable Decimal Points

Auto-zero

Auto-polarity

200mV d.c. Full Scale Reading (F.S.R.)

LOW
BATT

°C °F

µMVA

pH

KgMΩ

%

Single Rail Version

Autoranging Outputs

SCALING

Two resistorsRa andRb maybe fittedin orderto alterthe
full scale reading(F.S.R.) ofthe meter - seetable.
The meter willneed re-calibration.

Required F.S.R. Ra Rb

2V Note 910k 100k
20V Note 1M 10k
200V Note 1M 1k
2kV Note 1M 100R
200 A 0R 1k

µ

2mA 0R 100R
20mA 0R 10R
200mA 0R 1R

NOTE

Ensure that Link10 is open iffitting Ra.

Standard Meter DPM 200
Single Rail Version DPM 200S

Specification Min. Typ. Max. Unit

Accuracy (overall error) * 0.05 0.1 % (±1 count)
Linearity ±1 count
Sample rate 3 samples/sec
Operating temperature range 0 50 °C
Temperature s 30 ppm/°C
Supply DPM 200 7.5 9 14

voltage
(V+ to V-) DPM 200S 3.5 5 6.5
Supply current DPM 200 150

Input leakage reading (Vin = 0V) 1 10 pA

* To ensure maximum accuracy, re-calibrate periodically.

CONNECTOR SOURCING GUIDE

tability

1

7A

DPM 200S 500

Stock Number

V

Aµ

METHOD

Solder Solder wires or standard 0.1" square pin header to PCB

SAFETY

Edge Connector LASCAR EC 24 DS

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed 60Vdc. If voltages to the measuring
inputs do exceed 60Vdc, then fit scaling resistors externally to the module. The user must ensure that the incorporation of the DPM into the user ’s
equipment conforms tothe relevantsections ofBS EN61010 (Safety Requirementsfor Electrical Equipmentfor Measuring, Controland Laboratory Use).

13.0

DIMENSIONS All dimensions in mm (inches)

72.0 (2.83)

2.00

(0.08)

(0.51)

51.5 (2.03)

36.0 (1.42)

46.75 (1.84)

45.0 (1.77)

18.5 (0.73)

Display in TEST mode

Panel cut out 68 x 33 (2.68 x 1.30)

2.5 (0.09)

2.8 (0.11)

H

41

67.5 (2.66)

62.5 (2.46)

40

g

µ

V

%

ph

KEY

TEST

XB3

XDP

LMP+

LMP-

A

22

k

A

Ω

m

M

°F

°C

REAR

VIEW

CLK

XG3

-5V

V+

REF+

REF BG

REF-

2.54

(0.10)

E3

DP1

DP2

BPABPOL

~

DP3

REF HI

Ø2.5

23

(0.1)

:

-

BP

27.5 (1.08)

V-

REF LO

COM

IN LO

IN HI

1

7.06

(0.28)

6.10

(0.24)

A

41

912

6

13

10

Ra

Rb

1

ON BOARD
SOLDER LINKS

SCALING RESISTORS

14

REAR
VIEW

11427

15 3

8

22

PANELFITTING

Locate the meter by passing it through the front of the panel cut-out and, using the four screws provided, fix the plastic spring clips to the rear
of the meter.

LASCAR ELECTRONICS LTD.

MODULE HOUSE, WHITEPARISH,

TEL: [phone] FAX: [phone]

WILTSHIRE SP5 2SJ UK

E-mail: [e-mail]

LASCAR ELECTRONICS INC.

3750 West 26th Street,

TEL: [phone] FAX: [phone]

Erie, PA 16506 USA

E-mail: [e-mail]

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]

PIN FUNCTIONS

1. V- Negative power supplyconnection.

2. IN HI Positivemeasuring input. Analogue inputs mustbe nocloser than1V toeither the positive ornegativesupply. The negative

3. IN LO Negativemeasuring input. supply of theDPM 200S is generatedinternally and mirrors the positive supplyvoltage.

4. COM Groundforthe analogue sectionof theA/D converter. It isactively heldat approximately 2.8V belowV+ andmust notbe allowed

5. REF LO Negativeinput for referencevoltage.

to sink excessive current(>100 A) by, for instance,connecting toa highervoltage.

6. REF HI Positiveinput forreference voltage(connected via Link 1toREF+).

7. POL Drivefor negative polarity (-)annunciator. Internally connectedvia Link11 to the annunciator.

8, 10, 15,19 Outputs for auto-ranging applications.

9. BP LCD backplane drivewaveform.

11. REF+ Positive outputfrom internalreference.

12. REF- Negative output frominternalreference.

13. REF BG Output from bandgapreference (1.22V).

14. V+ Positivepower supplyconnection.

16. CLOCK Clock output maybe usedfor systems timing orasan input tooverride the internaloscillator andcontrol the sample rate.

17. -5V Output from negative railgenerator circuit. This is aninversion ofV+ (DPM200S only).

18. XDP Connectto required annunciators/DPs (seenote). This isan inversionof BP.

20. TEST Connect toV+ todisplay segments asillustrated. It should notbe operated for morethana few secondsas theDC Voltage
applied to theLCD may'burn'the display. This pinis normallyat 5V belowV+ andis theground for the digitalsection ofthe
meter. It canbe usedto powerexternal logic up toamaximum of 1mA.

21. LMP- N.C.

22. LMP+ N.C.

A. KEY Polarisingslot for edgeconnector.

41. H N.C.

SPECIAL NOTE - ANNUNCIATORS.

The DPM annunciators(DPs, °C, etc.)can bedisplayed,either by connectingto XDP
or by applying asolder link to theXDPpads located underthe annunciatorinput
pads. However,as these annunciatorsare normally'floating', under certainconditions
they may appearwhen notwanted. To suppressunwanted annunciators,apply a
solder link to thebackplane pads located in-betweentheannunciator input pads.
If the annunciatorsare beingswitched, connectthem viaa 1M resistor to the BP
(Pin 9), theannunciators willthen operatenormally when connectedto XDP.
Ensure that anannunciator isnot connecteddirectly tothe XDP and BPat the same time.
Note - ifsuppressing (-)annunciator bydirect connectionto BP, Link11 MUST be cutfirst.

µ

ANNUNCIATOR

XDP

RIGHT

ANNUNCIATOR

BP

XDP

WRONG

ANNUNCIATOR

XDP

ANNUNCIATOR

BP

Ω

Link either BP or XDP

to annunciator.

Do not link BP & XDP

to the annunciator

at the same time

XDP

VARIOUS OPERATING MODES

ON-BOARD LINKS: In order to quickly and easily change operating modes for
different applications the meter has several on-board links. They are designed
to be easily opened (cut) or shorted (soldered). Do not connect more than one meter
to the same power supply if the meters cannot use the same signal ground.

Normally
SHORTED
Cut to
OPEN

Taking any input beyond the supply rails will damage the meter.

V+

14

V+

2

IN HI

±200mV

+

3

IN LO

-

V-

1

V-

Check Links 2,3&4areSHORTED.

Measuring a floating voltage source
of 200mV full scale

V+

14

V+

2

IN HI

R

3

IN LO

0.2

R=

FSR

I

Check Links 2,3&4areSHORTED.

V-

1

V-

Measuring current. Supply MUST

be isolated.

±200mV

0V

Check Links 3 & 4 are SHORTED.

Split supply operation (DPM 200).

Check Link 1 is OPEN.

Measuring the ratio of two voltages.
Reading = 1000 V /V

50mV< V <200mV
V <2V .

12

+

-

1V
min.

V

V2

2

V+

14

V+

2

3

IN HI

IN LO

14V max
7V min

V-

1

V-

±200mV

Check Links 3 & 4 are SHORTED.

2

IN HI

+

3

-

IN LO

Measuring a single ended input
referenced to supply (DPM 200S).

V+

14

V+

2

+

IN HI

1

3

-

IN LO

6

+

REF HI

5

REF LO

-

V-

1

V-

U/RANGE

O/RANGE

V+

TEST (GND)

Generating basic Auto-ranging outputs.

12

Specifications liable to change without prior warning DPM 200 Issue 5 August/2002 M.C. Applies to DPM 200/7

14

V+

V-

1

Normally
OPEN
Solder to
SHORT

V+

V-

8

AB

9

BP

10

E3

15

XG3

19

XB3