LASCAR DPM100-BL User Manual

DPM 100-BL 3½ Digit Backlit LCD Module

A low cost,lowpower LCD panelmeter with a truedigital hold ofdisplayedreading. Withits high accuracyandfew connections, thismeter
is particularly suited to high volume applications. The DPM 100-BL is supplied complete with a flat, reverse printed window and snap-in
bezel. Very lowcurrent consumption giveslongbattery life, makingitespecially useful inportableequipment.

12.5mm (0.5“) Digit Height

Logic Selectable Decimal Points

Auto-zero

Auto-polarity

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

+

-

°C °F

mV

k

MH

z

LED Backlit

Digital Hold

SCALING

Two resistors Ra andRb may befitted in orderto alter the
full scale readingof themeter - see table.
Meter will needre-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 link Lais cutif fitting Ra.

Backlit Meter DPM 100-BL

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
Supply voltage 7.5 9 14 Vd.c.
Supply current 300 A

Temperature stability 100 ppm/°C
Input leakage current (Vin = 0V) 1 10 pA

* To ensure maximum accuracy, re-calibrate periodically.

(excl. backlight)

(incl. backlight)

30 mA

Stock Number

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 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)

24.8 (0.98)

(0.32)

45.0 (1.77)

16.0 (0.63)

Display in TEST mode

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

4.0 (0.16)12.1 (0.48)

REAR VIEW

Rb

Ra

La

2

1

11

8

9

1

3

10

ON BOARD SOLDER LINKS

SCALING RESISTORS

(0.19)

8.5 (0.33)

4.5

(0.17)

5.0

+

60.0 (2.36)

30.0 (1.18)

52.0 (2.05)

-

IN HI

IN LO

HOLD

DP1 (RH)

DP2

DP3 (LH)V+V-

REF HI

0.5

(0.02)

2.54
(0.1)

TEST

14.57
(0.57)

24.8. (0.63)

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. Finally fit the window into the front of the bezel.

www.lascarelectronics.com

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. IN HI Positivemeasuring input. Analogue inputsmust benocloserthan1Vtoeitherthepositiveor negative supply.

2. IN LO Negative measuring input.
Note: This pinis tiedbyLink2toCOM.Thislinkshould be open for any application where the supply voltage is notfully floating.
If open, ensure the inputs are restricted to the commonmode range. Com isheld internallyat2.8VbelowV+and must not be
allowed to sink excessivecurrent (>100 A) by,for instance,connectingtoahighervoltage. See noteon REFHI (pin9).

µ

3. HOLD If left floating or connected to TEST (pin 10), the meterwill continuouslymeasure theinputvoltage. When connectedtoV+thelast
displayed reading will be held indefinitely.

4. DP1 ConnecttoV+to display 199.9

5. DP2 ConnecttoV+to display 19.99

6. DP3 ConnecttoV+to display 1.999

7. V+ Positivepower supply.

8. V- Negative power supply.

9. REF HI Positive inputfor referencevoltage. Thisinput is isolated by Link 3. By shortingLink3andopeningLink1,the meter can be used in
ratio metric mode or with an external reference. Thereferencevoltageisreferredto COM and the internal reference is derivedfrom
the voltage between V+ and COM. IfCOM ispulleddown,thenanexternalreferencemustbe provided.

10. TEST Connect to V+ to display segments as illustrated. Itshould notbeoperatedformorethanafew seconds as the d.c. voltage applied to
the LCD may 'burn' the display. This pinisnormallyat 5V below V+ and is the ground for the digital sectionof themeter. It can be
used to power external logic up to a maximum of1mA.

DPM 100-BL

Apply 5V d.c. to the backlight tab on the sideof themeter. Typical currentis30mA. For higher voltages fit a resistor in series.
E.g. For 9Vuse 150 . Maximum current=60mA.

Ω

SPECIAL NOTE: ANNUNCIATORS

The DPM 100-BL annunciators (A, °F, °C etc.) can be selected by applying a solder link to the XDP pad. The pads are tied via links to the backplane in
order to suppresstheannunciators when not wanted. Care shouldbe taken to ensure thatlinks to BP areopen before connecting annunciator padsto
the XDP pad.

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+

7

V+

INPUT
VOLTAGE

+

Check Links 1 & 2 are SHORTED.

1

IN HI

2

-

IN LO

6

DP3

V-

8

V-

Measuring a floating voltage source of

±200mV

Check Link 2 is OPEN.

Split supply operation.

0V

+

-

1V
min.

1

2

V+

IN HI

IN LO

7

V+

V-

8

V-

200mV full scale and displaying DP3.

V+

7

V+

R=

1

IN HI

--

R

2

IN LO

0.2

I

FSR

V-

8

V-

+

-

Check Links 1 & 2 are SHORTED.

Measuring current. Supply MUST be
isolated.

1

9

1

2

V

V

2

Check Link 1 is OPEN.
SHORT Link 3.

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

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

2

12

V+

IN HI

REF HI

IN LO

12

V+

7

V-

8

V-

14V max
7V min

Normally
SHORTED
Cut to
OPEN

V+

7

V+

HOLD

TEST

V-

8

Driving HOLD fom external logic.
Logic powered from V+ (7) to TEST (10).

Normally
OPEN
solder to
SHORT

3

10

V-

Specifications liable to change without prior warning DPM 100-BL Issue 6 August/2002 M.C. Applies to DPM 100/2