LASCAR DPM2000 User Manual

DPM 2000 3½ Digit LCD Module

The DPM 2000 uses advanced components and construction techniques to provide an unrivalled combination of high performance,
elegant appearance and low cost. The module uses a bandgap reference for extra temperature stability. For single rail operation, the
DPM 2000S featuresabuilt-innegativerail generator,enabling themeter to measurea signal referenced toits ownpower supply 0V.

15mm (0.6“) Digit Height

Programmable Decimal Points

Auto-zero

Auto-polarity

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

Single Rail Version

SCALING

Two resistors Ra and Rb may be fitted in order to alter
the full scale reading (F.S.R) of the meter - see table.
The meter will need 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 link 1k

µ

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

NOTE

Ensure that link 10 is open if fitting Ra.

Standard Meter DPM 2000
Single Rail Version DPM 2000S

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 2000 7.5 9 14
(V+ to V-) DPM 2000S 3.5 5 6.5
Supply current DPM 2000 150

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

* To ensure maximum accuracy, re-calibrate periodically.

tability

voltage

DPM 2000S 500

Stock Number

V

A

µ

SAFETY

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 LaboratoryUse).

DIMENSIONS All dimensions in mm (inches)

32.5 (1.28)

36.0 (1.42)

27.5 (1.08)

72.0 (2.83)

Display in TEST mode

67.5 (2.66)

60.0 (2.36)

53.0 (2.09)

62.5 (2.46)

Ø2.50

(0.10)

19.0 (0.75)

29.5 (1.16)

ab

cd e

29.5 (1.16)

8

+

LMP

TEST

9

H5

12

13

fg

­pH

XB3

XDP

6

11 4 2 7

14

Rb
Ra

g

µ

V

%

°F

°C

-5V

CLK

XG3V+RBG

REF-

A

Ω

m

M

REF+E3BPABPOL

K

DP1

REF HI

3

1

5

10

:

-

~

DP2

DP3

L

H

REF LO

COM

V-II

ON BOARD
SOLDER LINKS

SCALING RESISTORS

a. 1.00 (0.04)
b. 9.00 (0.35)
c. 1.25 (0.05)
d. 5.50 (0.22)
e. 4.00 (0.16)

f. 0.50 (0.02)

g. 2.54 (0.10)

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 supply connection.

2. IH Positivemeasuringinput. Analogue inputs mustbe nocloser than1V toeither the positiveor negativesupply. The negative

3. IL Negativemeasuring input. supply of anS-type meteris generatedinternally and mirrorsthe positivesupply voltage.

4. COM The ground forthe analoguesection ofthe A/Dconverter, heldactively at2.8V (nom.)below V+. COM mustnot beallowed tosink

5. REF LO Negative inputforreference voltage.

excessivecurrent (>100 A) byconnecting it directly toa higher voltage.

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

7. POL Drivefor negative(-) annunciator. Internally connectedvia Link 11 tothe annunciator.

8, 10, 15,19 Outputs for autorangingapplications.

9. BP LCD backplane drive waveform.

11. REF+ Positiveoutput frominternal reference (connectedvia Link1 toREFHI).

12. REF- Negative output frominternal reference. MUST betied to a suitableground return tobias bandgap(normally COM).

13. R BG Ouput of bandgapreference (1.22Vnom).

14. V+ Positive power supplyconnection.

16. CLOCK Clock output. Maybe usedfor systemstiming oras an inputto overridethe internal oscillatorand control the samplerate.

17. -5V Outputfrom negativerail generatorcircuit (DPM 2000Sonly). This isaninversion of V+.

18. XDP Connectto requiredannunciators/DPs(see Special Note- Annunciators).

20. TEST Connect to V+to momentarilyturn on segments asillustrated. It should notbe operatedfor morethan a few secondsas the D.C.
voltage applied tothe LCDmay 'burn'the display. This pinis 5V (nom)below V+and istheground for thedigital sectionof the meter.
It can beused topower externallogicup to amaximumof 1mA.

µ

SPECIAL NOTE - ANNUNCIATORS.

The DPM annunciators (DPs, °C, etc.) can be displayed either by connecting to XDP
or by applying a solder blob link to the XDP pads located under the annunciator input

pads. However, as these annunciators are normally 'floating', under certain conditions

they may appear when not wanted. To suppress unwanted annunciators, apply a

solder blob to the backplane pads located in-between the annunciator input pads.
If the annunciators are being switched, connect them via M resistor to the BP

Ω

(Pin 9), the annunciators will then operate normally when connected to XDP. Ensure

that an annunciator is not connected directly to the XDP and BP at the same time.
Note - if suppressing POL (-) annunciator by direct connection to BP then Link 11
MUST be cut first.

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) orshorted (soldered). Do notconnect morethan onemeter to the same power supply
if the meters cannot use the same signal ground. Taking any input beyond the power
supply rails willdamage the meter.

2

±200mV

Check Links 2,3&4areSHORTED.

+

3

-

Measuring a floating voltage source of 200mV
full scale.

2

R

3

0.2

R=

I

FSR

Check Links 2,3&4areSHORTED.

Measuring current (supply MUST be isolated).

IN HI

IN LO

IN HI

IN LO

V+

14

V+

V-

1

V-

+

±200mV

Check Links 3 & 4 are SHORTED. Check Links 3 & 4 are SHORTED.

-

0V

1vmin.

2

3

IN HI

IN LO

V+

V-

14

1

Split supply operation (DPM 2000).

V+

14

V+

V-

1

V-

+

V1

-

+

V2

-

Check Link 1 is OPEN.

2

3

6

5

IN HI

IN LO

REF HI

REF LO

14

V+

V-

1

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

50mV < <200mV
V<2V

V

12.

12

2

V+

V-

ANNUNCIATOR

XDP

Link either BP or XDP

to annunciator.

V+

14V max.
7V min.

V-

RIGHT

ANNUNCIATOR

BP

XDP

Normally
SHORTED
Cut to
OPEN

+

±200mV

-

Measuring a single ended input
referenced to supply (DPM 2000S).

IIN

13

100K

6R2

Check Links 3 & 4 are SHORTED.

Measuring 4-20mA to read 0-999
(supply MUST be isolated).

IOUT

SET

5K

ZERO

WRONG

ANNUNCIATOR

XDP

Do not link BP & XDP

to the annunciator

at the same time

V+

14

V+

2

IN HI

3

IN LO

V-

1

V-

V+

14

V+

2

IN HI

REF BG

3

IN LO

4

COM

V-

1

V-

ANNUNCIATOR

BP

Normally
OPEN
Solder to
SHORT

XDP

Specifications liable to change without prior warning DPM 2000 Issue 4 August/2002 M.C. Applies to DPM 2000/5