Martel Electronics 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 features abuilt-innegativerailgenerator,enablingthemeter to measurea signalreferenced to itsown powersupply 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 of BS EN61010 (SafetyRequirements forElectrical Equipmentfor Measuring, Control andLaboratory Use).

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)

Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053
Toll Free: [phone] Phone: [phone] Fax: [phone]

PIN FUNCTIONS

1. V- Negative power supply connection.

2. IH Positivemeasuring input. Analogue inputs mustbe nocloser than1V to either thepositive or negative supply. The negative

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

4. COM The ground forthe analoguesection ofthe A/D converter,held actively at2.8V (nom.)below V+. COM mustnot beallowed to sink
excessivecurrent (>100 A) byconnecting it directlyto ahigher voltage.

µ

5. REF LO Negative inputfor referencevoltage.

6. REF HI Positiveinput forreference voltage(connected via Link1 toREF+).

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

8, 10, 15,19 Outputs for autorangingapplications.

9. BP LCD backplane drive waveform.

11. REF+ Positiveoutput frominternal reference (connectedvia Link1 toREF HI).

12. REF- Negative output frominternal reference. MUST betied to asuitable groundreturn to bias bandgap(normally COM).

13. R BG Ouput of bandgapreference (1.22V nom).

14. V+ Positive power supplyconnection.

16. CLOCK Clock output. Maybe usedfor systemstiming or as aninput to overridethe internaloscillator and control the samplerate.

17. -5V Outputfrom negativerail generatorcircuit (DPM 2000Sonly). This isan inversion ofV+.

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

20. TEST Connect to V+to momentarilyturn on segmentsas illustrated. It shouldnot beoperated formore than afew secondsas theD.C.
voltage applied tothe LCDmay 'burn'the display. This pinis 5V (nom)below V+and isthe ground for thedigital section ofthe meter.
It can beused topower externallogic up to amaximum of 1mA.

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.

RIGHT

ANNUNCIATOR

XDP

Link either BP or XDP

to annunciator.

ANNUNCIATOR

BP

XDP

WRONG

ANNUNCIATOR

XDP

Do not link BP & XDP

to the annunciator

at the same time

ANNUNCIATOR

BP

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

2

±200mV

Check Links 2, 3 & 4 are SHORTED.

+

3

-

Measuring a floating voltage source of 200mV
full scale.

2

R

3

0.2

R=

I

FSR

Check Links 2, 3 & 4 are SHORTED.

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.

3

2

V+

IN HI

IN LO

V-

Split supply operation (DPM 2000).

V+

14

V+

1

V

2

V

V-

1

V-

Check Link 1 is OPEN.

V+

2

+

IN HI

3

-

IN LO

6

+

REF HI

5

REF LO

-

V-

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

50mV < <200mV
V<2V

V

12.

12

2

V+

Normally
OPEN
Solder to
SHORT

V+

14

V-

1

V-

Normally
SHORTED
Cut to
OPEN

V+

14

2

14V max.
7V min.

1

V-

±200mV

+

-

3

IN HI

IN LO

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

2

3

4

IN HI

REF BG

IN LO

COM

V+

14

V+

V-

1

V-

V+

14

1

V-

IIN

13

100K

6R2

SET

5K

ZERO

IOUT

Check Links 3 & 4 are SHORTED.

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

Specifications liable to change without prior warning DPM 2000 Issue 3 August/1997 M.C. Applies to DPM 2000/5