LASCAR DPM400 User Manual

DPM 400 3½ Digit LCD Module

A unique compact LCD meter, ideally suited to low or high volume applications. The meter has a 28 pin DIL integrated circuit format
and can be plugged directly into a DILsocket or panel mounted using the snap in bezel provided. The low profile bezel incorporates a
flat reverse printed window, giving a superb appearance that cannot be damaged or removed by contact.

10mm (0.4“) Digit Height

Programmable Decimal Points

Auto-zero

Auto-polarity

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

Annunciators

SCALING

Two resistors can be used fitted in order to alter the full
scale reading ofthemeter- see table.
The meter will have to be re-calibrated by adjusting the
calibration potentiometer CAL.

+

INPUT

Ra

Rb

-

Required F.S.R. Ra Rb

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

µ

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

Note

Ensure Ra isratedforhigh voltage use.

IN HI (10)

IN LO (11)

+

-

°C°F

µA

mV

kΩ

MH

z

Stock Number

Standard Meter DPM 400

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 100 ppm/°C
Supply (V+ to V-) 7 9 14 V

tability

voltage
Low battery threshold 7.5 V
Supply current 150 A

µ

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

* To ensure maximum accuracy, re-calibrate periodically.

CONNECTOR SOURCING GUIDE

28 Pin DIL IC SocketMETHOD

DIMENSIONS All dimensions in mm (inches)

18.2 (0.72)

ab

f

gh

31.0 (1.22)

13.0 (0.51)

Display in TEST mode

Panel cut-out 45 x 22 (1.77 x 0.87)

11

4

2

3

1

14

a. 1.50 (0.06)
b. 9.00 (0.35)
c. 3.70 (0.15)
d. 2.54 (0.10)
e. 0.50 (0.02)

f. 5.00 (0.20)
g. 1.60 (0.06)
h. 4.00 (0.16)

9

1

ON BOARD
SOLDER LINKS

48.0 (1.89)

24.0 (0.84)

40.5 (1.59)

µ

VmA

°C

20.5 (0.80)

ΩMK

IN LO

IN HI

COM

REF LO

REF HI

DP1

cd e

V+

DP2

V-

CLOCK

DP3

XDPBPTEST

~

:

15.24 (0.60)

PANELFITTING

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

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. TEST Connect toV+todisplay segmentsas illustrated. It shouldnotbe operatedfor morethana fewseconds astheDC voltageapplied

2. BP LCD backplanedrivewaveform.

3. XDP Connect torequiredannunciators/DPs (see note).

4. DP3 1.999

5. DP2 19.99

6. DP1 199.9

7. REF HI Positive inputfor referencevoltage (connectedvialink 1to internalreference).

8. REF LO Negativeinputfor referencevoltage(connected vialink 3toCOM).

`9. COM The groundforthe analoguesectionof theA/D converter, heldactively at2.8V (nom.)belowV+. COMmustnot beallowedto

10. IN HI Positivemeasuringinput.

11. IN LO Negative measuringinput.

24. V+ Positivepower supply.

25. V- Negative powersupply.

26. CLOCK Clock outputmaybe usedforsystems timingor asaninput tooverridethe internaloscillatorand controlthe samplerate.

to theLCDmay ‘burn'thedisplay. This pinis normallyat5V belowV+ andisthe groundfor thedigitalsection ofthe meter. Itcan
be usedtopower externallogicup toa maximumof1mA.

sink excessivecurrent(>100 A) byconnecting itdirectly toahigher voltage.

µ

Analogue inputsmustbe nocloserthan 1Vto eitherthepositive ornegative supply.

SPECIAL NOTE: ANNUNCIATORS

The DPM annunciators (DPs, °C, etc.)can be shown by connecting them to XDP. However, as these annunciators are normally 'floating' under certain
conditions they may appear when not wanted. To suppress unwanted annunciators link them to the backplane (BP). If the annunciators are being
switched, connect them via a 1M resistor to the BP (pin 2). The annunciators will then operate normally when connected to XDP. Ensure that an
annunciator isNOTconnected directlytothe XDPand BPatthe sametime.

SAFETY

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to themodule’s pins must not exceed60Vdc. 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 to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for
Measuring, Control and Laboratory Use).

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+

24

V+

10

+

±200mV

Check Link 2 is SHORTED.

IN HI

11

IN LO

-

V-

25

V-

Measuring a floating voltage source

+

±200mV

-

0V

1vmin.

Split supply operation.

V+

10

IN HI

11

IN LO

V-

of 200mV full scale.

V+

24

10

IN HI

R

11

IN LO

0.2

R=

I

FSR

Check Link 2 is SHORTED.

Measuring current
(supply MUST be isolated).

V+

V1

V2

V-

25

V-

Check Link 1,3&4areOPEN.

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

50mV < <200mV
V<2V

V

2

12.

V+

10

+

IN HI

11

-

IN LO

7

+

REF HI

8

REF LO

-

V-

12

Normally
SHORTED
Cut to
OPEN

24

25

V+

14V max.
7V min.

V-

510K

10

SUPPLY
VOLTAGE

Check Link 2 is OPEN.

10K

11

510K

Measuring a supply voltage
(min. 7V, max. 14V).

V+

24

25

V-

6R2

IIN

IOUT

100K

10

SET

11

5K

ZERO

9

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

IN HI

IN LO

IN HI

IN LO

COM

V+

V-

24

25

24

V+

V-

25

Normally
OPEN
Solder to
SHORT

V+

V-

V+

V-

Specifications liable to change without prior warning DPM 400 Issue 4 August/2002 M.C. Applies to DPM 400/7