LASCAR DPM959B User Manual

DPM 959B 3½ Digit LED Module

A compact meter ideally suited to applications where excellent readability under all lighting conditions is required. The
meter is fitted with high efficiency LEDs which, together with the integral red filter, give a high contrast display with 19mm
digit height. The meter can be easily scaled by the user to indicate volts, amps orotherengineeringunitsandmaybeusedin
single-ended, differential, ratio-metric or floatinginputmodes.

19mm (0.75“) Digit Height

Programmable Decimal Points

Auto-zero

Auto-polarity

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

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 by
adjusting thecalibrationpotentiometer.

Required F.S.R. Ra Rb

2V Note
20V Note 1M 10k
200V Note 1M 1k
2kV Note
200 A LINK 1k

m

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

NOTE

Ensure thatsolderlink 10acrossRa is OPEN.

910k 100k

1M 100R

Standard Meter DPM 959B

Specification Min. Typ. Max. Unit

Accuracy (overall error) * 0.1 % (±1 count)
Linearity ±1 count
Sample rate 2.5 samples/sec
Operating temperature range 0 50 °C
Warm-up time 10 minute
Temperature s 150 ppm/°C
Supply 4.75 5 5.25 V
Supply 50 90 mA
Input leakage current (Vin = 0V) 1 10 pA

tability
voltage (V+ to V-)
current

* To ensure maximum accuracy, re-calibrate periodically.

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 ElectricalEquipmentforMeasuring, Control andLaboratory Use).

Stock Number

DIMENSIONS All dimensions in mm (inches)

40.5 (1.59)

44.0 (1.73)

39.0 (1.54)

24.2 (0.95)

76.0 (2.99)

72.5 (2.85)

51.0 (2.01)

Display in Test Mode

61.5 (2.42)

51.0 (2.01)

71.5 (2.81)

24.0 (0.94)

Ø5.7

(0.22)

24.5 (0.96)

Ø3.0

(0.12)

Panel cut-out 72 x 40 (2.83 x 1.57)
Maximum panel thickness 3mm (0.12).

www.lascarelectronics.com

a

b

d

c

a. 1.0 (0.04)
b. 2.0 (0.08)
c. 6.5 (0.26)
d. 11.5 (0.45)
e. 9.5 (0.37)

e

REAR
VIEW

REAR
VIEW

1

11

POL

SCALING RESISTORS
ON TOPSIDE OF BOARD

ON-BOARD SOLDER LINKS

DE

DP2

DP3

2.54 pin pitch

2

7

16

DP COM

DP1

3

REF LO

VNEG

+SEG

IN LO

COM

GND

REF HI

POL

NC

IN HI

TEST

V+

10

Rb

1

DP1

2.54 pin pitch

21.5

12

Ra

DP3

DP2

LASCAR ELECTRONICS LTD.
MODULE HOUSE
WHITEPARISH WILTSHIRE SP5 2SJ
UK
TEL: [phone]
FAX: [phone]
E-mail: [e-mail]

LASCAR ELECTRONICS INC.
3750 WEST 26th STREET
ERIE PA 16506
USA
TEL: [phone]
FAX: [phone]
E-mail: [e-mail]

PIN FUNCTIONS

1. +SEG Use to indicatepositive polarity-see "VARIOUS OPERATINGMODES" for details.

2. POL To completely disablethe negative polaritysign, cutsolder linkPOL.

3. GND Negative power supplyconnection (0V).

4. V+ Positivepower supplyconnection (+5V).

5. V NEG Output from negativerail generator(-5V nom).This is aninversion ofV+.

6. TEST When taken toV+ all segments,exceptdecimal points, shouldlight i.e. "-1888".

7. IN LO Negative measuring input. Analogueinputs must beno closer than1.5V tothe positiveor negative supply.

8. IN HI Positive measuring input. The negative supply is generated internally and mirrors the positive supply voltage.

9. COM Ground foranalogue section ofthe A/Dconverter,it is activelyheld at 3.05Vbelow V+and mustnot be allowedto sink
excessivecurrent (>100 A)by,for instance, connectingto a highervoltage.

m

10. NC Do not connect.

11. REF LO Negative input forreference voltage. (Connected viaLink 3to COM.)

12. REF HI Positiveinput forreference voltage. (Connected via Link1 tointernal reference.)

13. DP COM Connectto Pins14, 15 or16 toilluminate therequired decimal point,alternatively usethe on-board solderlinks DP1,2 or3.

14. DP1 Connect to Pin13 todisplay DP1 (199.9).

15. DP2

16. DP3

Connect to Pin13 todisplay DP2(19.99).
Connect to Pin13 todisplay DP3(1.999).

SOLDER LINKS

1. Normally closed. Open this linkto disablethe internalreference. Then applyan externalreference to REFHI (pin12).

2. Normally open. Close thislink to connectIN LO (pin7) toCOM (pin9).

3. Normally closed. Open this linkto disconnectCOM (pin9) from REFLO (pin11).

7. Normally open. Close thislink connect INLO (pin 7)to GND(pin 3).

10. Normally closed. Openthis link whenfitting scaling resistorRa.
DP1-2-3. Normally open. Close one ofthese linksto display decimalpoints DP1(199.9), DP2(19.99) orDP3 (1.999) respectively.
POL. Normally closed. Openthis linkto disablethe polaritysign. See Pin Functions 1and 2above.

VARIOUS OPERATING MODES

ON-BOARD SOLDER LINKS: In order to quickly and easily change operating
modes for different applications the meter has several on-board solder links.
They are designedto beeasily opened(cut) or shorted(soldered). Do notconnect
more than one meter to the same power supply if the meters cannot use thesame
signal ground. Taking any input beyond the power supply rails will damage the
meter.

+4.75 to +5.25V +4.75 to +5.25V +4.75 to +5.25V

4

V+

INPUT
VOLTAGE

+

Check solder link 2 is OPEN.

8

IN HI

7

-

IN LO

GND

3

0V 0V

Operation with input referenced to panel
meter supply (Single ended mode).
Preferably link IN LO to GND at signal
source (to reduce loop noise), otherwise
make link 7.

4

V+

8

IN HI

R

7

0.2

R=

FSR

I

Check solder links 2 & 3 are SHORTED.

IN LO

GND

3

Measuring current.
Supply MUST be isolated.

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

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

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

IIN

220k

6R2

Set

5k

Zero

I

OUT

+4.75 to +5.25V+4.75 to +5.25V

+

V

1

-

+

V

2

-

Check solder links 1 & 3 are OPEN.

2

12

8

7

9

8

7

12

11

12

IN HI

IN LO

COM

GND

IN HI

IN LO

REF HI

REF LO

GND

V+

V+

4

3

4

3

0V0V

+4.75 to +5.25V

(Pin 4)

POL
(Pin 2)

0V
(Pin 3)

V+

GND

4

3

Normally
OPEN
Solder to
SHORT

0V

Normally
SHORTED
Cut to
OPEN

Input
Voltage

Check solder link 2 is SHORTED.Check solder link 2 is OPEN.

+

8

IN HI

7

-

IN LO

Operation with input floating
with respect to power supply.

(Pin 1)

1K0

BC307

BC307

10K

1K5

10K

The above circuit can be used to
indicate both positive and negative
polarity, by illuminating either the
+ or - segment on the meter.

+SEG

Specifications liable to change without prior warning DPM 959B Issue 8 October/2003 M.C. Applies to DPM 959B/1