DPM 950 3½ Digit LCD Module
Very lowcurrent consumptionresults ina long battery life and makes theDPM 950ideal for portable equipment. Forlow lightviewing,
a long life LED backlightis fitted. Themeter ishoused in a robust carrierwhich can be bolted in placeor panel mounted using thebezel,
window and clipsprovided.
19mm (0.75“) Digit Height
IDC Interface
Auto-zero
Auto-polarity
200mV d.c. Full Scale Reading (F.S.R.)
LED Backlight
Single Rail Version
Alarm Annunciator
Stock Number
SCALING
Two resistorsRa and Rb may be fitted inorder toalter the
full scale reading(F.S.R.) of themeter -see table.
The meter willneedre-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 100R
20mA 10R
200mA 1R
NOTE
Ensure that Link10is open iffitting Ra.
LINK
LINK
LINK
Standard Meter DPM 950
Single Rail Version DPM 950S
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 DPM 950 7.5 9 14
(V+ to V-) DPM 950S 3.5 5 6.5
Supply current DPM 950 150
(not including backlight) DPM 950S 500
voltage
tability
V
Aµ
Backlight current * 50 mA
Input leakage current (Vin = 0V) 1 10 pA
* Supply voltage 5V nom.
** To ensure maximum accuracy, re-calibrate periodically.
CONNECTOR SOURCING GUIDE
METHOD Cable Mounting IDC Supplied With Product
DIMENSIONS All dimensions in mm (inches)
44.0 (1.73)
39.0 (1.54)
76.0 (2.99)
72.5 (2.85)
40.5 (1.59)
51.0 (2.01)
61.5 (2.42)
51.0 (2.01)
24.0 (0.94)
71.5 (2.81)
24.0 (0.94)
Ø5.7
(0.22)
24.5 (0.96)
Ø3.0
(0.12)
a
b
c
d
e
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)
51 (2.01)
24 (0.94)
Display in Test Mode
CAL
V+
LP+
REF HI
TEST
N.C.
DP3
DP1
IN HI
V-
LP-
-5V
DP2
XDP
COM
IN LO
REF LO
Panel cut-out 72 x 40 (2.83 x 1.57)
Maximum panel thickness 3mm (0.12).
2341
Ra
Rb
REAR
Ra
Rb
VIEW
DP1
DP2
REAR
VIEW
11
12
DP3
ON BOARD
SOLDER LINKS
SCALING RESISTORS
LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
WILTSHIRE SP5 2SJ UK
E-mail: sales@lascar.co.uk
LASCAR ELECTRONICS INC.
3750 West 26th Street,
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
Erie, PA 16506 USA
E-mail: us-sales@lascarelectronics.com
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
PIN FUNCTIONS
1. LP- Negative powersupply toLEDbacklighting.
2. LP+ Positivepower supplyto LEDbacklighting.
3. V- Negative power supplyconnection.
4. V+ Positive power supply connection.
5. -5V Output fromnegative railgeneratorcircuit. This outputisan inversion of V+(DPM 950Sonly).
6. TEST Connect toV+ todisplay allsegmentsexceptDPs. It should notbe operatedformore than a fewseconds asthe D.C.voltageapplied to
7. IN LO Negative measuring differential input. Analogue inputsmust benocloser than 1V toeither positiveor negativesupply. Thenegative
8. IN HI Positive measuring differential input. supply of the DPM950S isgenerated internallyand mirrors thepositive supplyvoltage.
9. COM Ground for theanalogue sectionofthe A/D converter,itis actively held atapproximately 2.8Vbelow V+and mustnotbe allowed to
11. REF LO Negative input for referencevoltage. Can beconnected toCOM vialink3.
12. REF HI Positiveinput forreference voltage. Connected vialink1 to internal reference.
13. XDP Annunciator Drive Waveform,this is an inversionof thebackplane.
14. DP1 199.9
15. DP2 19.99 Connect toV+to display required DecimalPoint or short correspondingDP link.
16. DP3 1.999
18 & 32. BP LCD backplane drive waveform.
23. REF- Negative output from internalreference.
24. REF+ Positiveoutput from internal reference.
25. LO BAT Used to control the low battery annunciator externally, cut link 12 and take to V+ to turn on annunciator.
26. REF BG Output from internal bandgap reference. (Factory fitted option.)
27. Alarm annunciator,cut linkALMand take to XDPto display.
28. : Colon annunciator,cut linkCOLand take to XDP todisplay.
29. - Polarity annunciator,connectedvia link 11 topolarity outputof IC1. Cut link 11and eithertake toXDP to
30. POL Polarityoutput ofIC1.
31. CLK May be usedto overridethe internal oscillatorand controlthe samplerate. Link 14must thenbemade.
the LCD may 'burn'the display. This pin is normallyat 5VbelowV+ and is theground forthedigital section of themeter. It can be
used to power external logicupto a maximum of1mA.
sink excessive current (>100 A) by, for instance, connectingto ahighervoltage.
The annunciator turn on point can also be set by adjusting the BAT potentiometer (R10), in which case do
not connect to this pin and leave link 12 intact.
µ
Only Pins 1-16 are fitted,
these functions are
available but a connector
is not provided.
display or make other sideof link11to hold off.
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 relevant sectionsof BS EN 61010(SafetyRequirements for ElectricalEquipment for Measuring,Control andLaboratory Use).
VARIOUS OPERATING MODES
ON-BOARD LINKS: In order to quickly and easily change operating modes for different applications,
the meter has several on-boardlinks. They aredesigned to beeasily opened (cut) orshorted (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+
4
V+
8
+
IN HI
±200mV
Check Links 2 & 3 are SHORTED.
7
IN LO
-
V-
3
V-
Measuring a floating voltage source
±200mV
0V
1V min
Split rail supply (DPM 950)
of 200mV full scale.
V+
4
V+
8
0.2
I
IN HI
7
IN LO
FSR
V-
3
V-
R
R=
Check Links 2 & 3 are SHORTED.
Measuring current. Supply MUST
be isolated.
V1
V2
Check Links 1 & 4 are OPEN.
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV < <200mV
Specifications liable to change without prior warning DPM 950 Issue 8 August/2002 M.C. Applies to DPM 950/4
V+
4
V+
8
+
IN HI
7
IN LO
-
V-
Check Link 3 is SHORTED.
V+
8
+
IN HI
7
-
IN LO
12
REF HI
+
11
REF LO
-
VV<2V
V-
12
212.
14V max
7V min
3
V-
V+
4
3
V-
±200mV
Normally
SHORTED
Cut to
OPEN
V+
8
+
-
Check Link 3 is SHORTED.
7
IN HI
IN LO
V-
Normally
OPEN
Solder to
SHORT
V+
4
3
V-
Measuring a single ended input
referenced to supply (DPM 950S).
V+
IIN
220k
6R2
Set
5k
Zero
I
OUT
Check Link 3 is SHORTED.
8
7
9
IN HI
IN LO
COM
V+
V-
4
3
V-
Measuring 4-20mA to read 0-999
(supply MUST be isolated).
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