LASCAR DPM500 User Manual

DPM 500 3½ Digit LCD Module

The DPM 500 uses advancedcomponents and construction techniques to providea uniquely compactunit. The meteris in a 40 pin DIL
integrated circuit format that can be plugged directly into a DIL socket or panel mounted using the snap in bezel. For single rail use, the
DPM 500S-BL featuresabuilt in negativerailgenerator, enablingthe meter tomeasurea signal referencedtoits own powersupply0V.

12.5mm (0.5“) Digit Height

Programmable Decimal Points

°°

Auto-zero

Auto-polarity

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

Backlit Single Rail Version (DPM 500S-BL)

+

-

CF

µA

mV

kΩ

MHz

Annunciators

Stock Number

Standard Meter DPM 500

SCALING

Two resistors Ra andRb may befitted in orderto alter the
full scale reading(F.S.R.) ofthe meter - see table.
Meter will needre-calibration.

Backlit Single Rail Version DPM 500S-BL

Specification Min. Typ. Max. Unit

Accuracy (overall error)* 0.05 0.1 % (±1 count)
Linearity ±1 count
Sample rate 3 sample/sec

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 link 10is cutif fitting Ra.

SAFETY

Operating temperature range 0 50 °C
Temperature stability 100 ppm/°C
Supply DPM 500 7.5 9 14
voltage DPM 500S-BL 3.5 5 6.5

V

Supply current DPM 500 150

(not inc. backlighting)

DPM 500S-BL 250
Backlight Voltage 5 V
(DPM 500S-BL) Current 30 60 mA
Input leakage current (Vin = 0V) 1 10 pA

* To ensure maximum accuracy, re-calibrate periodically.

CONNECTOR SOURCING GUIDE

METHOD 40 Pin DIL IC Socket

Aµ

To complywiththe Low Voltage Directive (LVD93/68/EEC), input voltages tothe module’s pins mustnot exceed 60Vdc. If voltagesto the
measuring inputs doexceed60Vdc, then fitscaling resistors externally tothe module. Theuser must ensurethat the incorporationofthe
DPM into the user ’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for
Measuring, Control andLaboratory Use).

DIMENSIONS All dimensions in mm (inches)

1.1

8.2

(0.04)

60.0 (2.36)

30.0 (1.18)

(0.32)

45.0 (1.77)

16.0 (0.63)

Display in TEST mode

a. DPM 500 6.7 (0.26)

DPM 500S-BL 12.1 (0.48)

b. 4.80 (0.19)

Panel cut-out = 57 x 27 (2.24 x 1.06)

5.0

(0.19)

8.5 (0.33)

1

-

+

40

1.87

(0.07)

52 (2.05)

7

V

m

°F

°C

V+

Ω

HI

Hz

TEST

REF

LO

REF

REF+

0.5

(0.02)

V+

K

~

M

BG

-5V

REF-

COM

XDP

IN HI

IN LO

2.54
(0.1)

12

µ

A

20

:

-

E3

AB

XB3

POL

21

15.2 (0.60)

V-

DP1

DP2

DP3

24.8 (0.98)

BP

b

XG3

4.0 (0.16)

a

1

13

-

+

40

12

3

2

10

1

Rb Ra

12

7

5

4

7

REAR VIEW

9

11

20

8

15

14

DPM 500S-BL ONLY
ON-BOARD LINKS

OPTIONAL SCALING

21

RESISTORS

PANELFITTING

Fit the bezel to the front of the panel and locate the meter into the bezel from behind. Alternatively the meter and bezel may be assembled before
fitting to the front of the panel but care must be taken not to use excessive force. Finally fit the window into the front of the bezel.

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, 40. V+ Positive powersupply.
2 -7, 12-14, 17, 38, 39 See

15. - Input forthe polarityannunciator. InternallylinkedtoPOL(pin20). Ifthisisto be externally controlled, cut link 11.

16, 18, 19, 22 XB3, E3, AB, XG3. Outputs for use in auto-rangingapplications.

20. POL Drivefor"-"annunciator. Internallyconnectedbylink11.

21. BP LCD backplane drive waveform.

23. DP3 1.999

24. DP2 19.99 See

25. DP1 199.9

26. V- Negativepower supply. Note thatif theDPM500S-BL isbeingused, the voltage between V+ and V-mustnotexceed6.5V.

27. XDP Connecttorequiredannunciators/DPs(see note).

28. -5V Outputfrom negativerailgeneratorcircuit. Thisoutputisan inversion of V+ (DPM 500S BL ONLY).

29. BG Input for bandgap reference. (1.22V nom).

30. IN LO Negative measuring input. Analogue inputs must be no closer than 1V to either thepositive ornegative supply. The negative

31. IN HI Positivemeasuring input. supply of the DPM 500S-BL is generated internally andmirrorsthepositivesupplyvoltage.

32. COM The ground for theanalogue sectionof theA/Dconverter, heldactively at2.8V(nom)belowV+. COMmustnotbe allowed to sink

33. REF- Negative outputfrom internalreference.

34. REF+ Positiveoutput frominternalreference.

35. REF LO Negative input for reference voltage.

36. REF HI Positiveinput forreferencevoltage.

37. TEST Connecting thispin toV+turnsonthe segments as illustrated. It should not be operated formore thana fewseconds astheDC

40. V+/CLK NormallytiedtoV+viaLink12butcan be used to over ride the internal oscillatorand controlthe sampleratebycuttingLink12and

SPECIAL NOTE: ANNUNCIATORS.

SPECIAL NOTE: ANNUNCIATORS.

excessivecurrent(> 100 A) by connecting it directly to a highervoltage.

µ

voltage applied to the LCD may "burn" thedisplay. Thispin is nominally at 5V below V+ and is the ground forthe digitalsection

of the meter,it canbe usedas anegativesupplytopowerexternallogicup to a maximum of 1mA.

making Link 13.

LED BACKLIT VERSIONS:

Apply 5V DC to thebacklight tabonthe side of the meter. Typical current is30mA. Forhigher voltages, fit a resistorin series.

E.g. For9Vuse150R. Maximum current =60mA.

SPECIAL NOTE: ANNUNCIATORS:

The DPM annunciators (DPs, °C, etc.) can be displayed by connecting them to XDP. However as these
annunciators are normally ‘floating’, under certainconditions they may appear when not wanted. To suppress unwantedannunciators, link themto
the backplane (BP). If the annunciators are being switched, connect them via a 1M resistor to the BP (pin 21). The annunciators will then operate
normally when connected to XDP. Ensure that an annunciator is notconnected directlyto theXDPandBPatthesametime.

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.

V+

1

V+

31

+

±200mV

Links 1, 2,3&4SHORTED.

IN HI

30

IN LO

-

V-

26

V-

Measuring a floating voltage

±200mV

+

-

0V

1V min

Links 1, 3 & 4 SHORTED.

Split supply operation (DPM 500).

30

31

1

V+

IN HI

IN LO

V-

26

source of 200mV full scale.

V+

1

V+

31

IN HI

R

R=

30

0.2

FSR

I

IN LO

V-

26

Links 1, 2, 3, 4 SHORTED.

V-

Measuring current
(supply MUST be isolated).

+

V1

-

+

V2

-

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

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

2

12

31

30

36

35

IN HI

IN LO

REF HI

REF LO

12

V+

V-

1

26

V+

V-

V+

14V max
7V min

V-

Normally
SHORTED
Cut to
OPEN

31

+

±200mV

Links 1,3&4SHORTED.

IN HI

30

-

IN LO

Measuring a single ended input
referenced to supply (DPM 500S-BL).

IIN

31

IN HI

6R2

220K

5K

30

IN LO

32

COM

IOUT

Links 1,3&4SHORTED.

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

V+

V-

V+

V-

1

26

1

26

Normally
OPEN
Solder to
SHORT

V+

0V

V+

V-

Specifications liable to change without prior warning DPM 500 Issue 5 August/2002 M.C. Applies to DPM 500/7