DIMENSIONS All dimensions in mm (inches)
NOTE
Ensure that Ra is rated for high voltage use.
SCALING
NOTES
A potential divider may be used to alter the full scale
reading (F.S.R.)ofthemeter-seetable.
Themeterwillhavetobe
re-calibratedbyadjusting
thecalibrationpotentiometer
attherearofthemodule.
REF
8.25mm (0.32“) Digit Height
Programmable Decimal Points
Auto-zero
Auto-polarity
200mV d.c. Full Scale Reading (F.S.R.)
DPM 2 3½ Digit Subminiature LCD Module
Required F.S.R. Ra Rb
2V 910k 100k
20V 1M 10k
200V 1M 1k
2kV N o te 10M 1k
200 A 0R 1k
2mA 0R 100R
20mA 0R 10R
200mA 0R 1R
µ
PANELFITTING
Locate the meter bypassing it through the front of the panel cut-out and gently push until the rear of the bezel is flush with the panel (DO NOT PUSHON
THELCD). Thesnap-inlugswillnowautomaticallyholdthemeterfirmlyinposition.
TheDPM2usesthelatestminiaturisationtechniquestoproduceavery compact meter. The snap-in integral bezelmakesinstallationeasy. For
singlerailuse,theDPM2Sfeaturesabuiltinnegativerailgenerator, enablingthemetertomeasureasignalreferencedtoitsownpowersupply
0V.
Specification Min. Typ. Max. Unit
Accuracy (overall error) * 0.1 % (±1 count)
Linearity ±1 count
Sample rate 3 samples/sec
Operating temperature range 0 50 °C
Temperature stability DPM 2 200
DPM 2S 100
Supply voltage DPM 2 7 9 14
DPM 2S 3 5 7
Supply current DPM 2 150
DPM 2S 250
Input leakage current (Vin= 0V) 1 10 pA
* To ensure maximum accuracy, re-calibrate periodically.
Stock Number
Standard Meter DPM 2
Single R ail Version DPM 2 S
ppm/°C
V
Aµ
2
3IN HI
IN LO
+
-
10nF
Rb
Ra 1M
INPUT
CONNECTOR SOURCING GUIDE
METHOD SUPPLIED WITH PRODUCT
35.0 (1.38)
32.5 (1.27)
22.3 (0.88)
9.70 (0.38)
17.0 (0.67)
14.5 (0.57)
abcd a. 2.00 (0.08)
b. 6.00 (0.23)
c. 1.60 (0.06) max
d. 6.00 (0.23)
e. 2.00 (0.08)
f. 0.50 (0.02)
g. 7.26 (0.28)
h. 1.76 (0.07)
CAP+
CAP-
V+
GND
REF HI
REF LO
COM
IN HI
IN LO
V-
efg
h
Panel cut-out
33.0 x 15.0 (1.30 x 0.60)
Panel thickness
1.0to2.5(0.04to0.1)
10 10
11
DP1
DP2
DP3
ON BOARD SOLDER LINKS
Specifications liable to change without prior warning DPM 2 Issue 5 August/1997 M.C. Applies to DPM 2/1
PIN FUNCTIONS
ONBOARDLINKS
SAFETY
1. V- DPM2-negativepowersupplyconnection.
DPM2S-C2negativeconnection.
2. INLO Negativemeasuringinput. Analogueinputsmustbenocloserthan1Vtoeitherthepositiveornegativesupply.
3. INHI Positivemeasuringinput. ThenegativesupplyoftheDPM2S isgeneratedinternallyandmirrorsthepositivesupplyvoltage.
4. COM GroundforanaloguesectionofA/Dconverter, itisactivelyheldat2.8VbelowV+andmustnotbeallowedtosinkexcessivecurrent
(>100 A)by, forinstance, connectingtoahighervoltage.
5. REFLO Negativeinputforreferencevoltage.
6. REFHI Positiveinputforreferencevoltage(connectedviaLinkREFtointernalreference).
7. CAP-
8. CAP+
9. GND DPM2-noconnection.
DPM2S -0Vpowersupplyconnection.
10. V+ Positivepowersupplyconnection.
µ
Onboardlinkscanbemadewithasolderlinktoimplementfeatures.
DP1 MaketoturnonDP1(199.9).
DP2 MaketoturnonDP2(19.99).
DP3 MaketoturnonDP3(1.999).
REF Factorymade-ConnectsinternalreferencetoREFHI. Itshouldonlybecutifanexternalreferenceisused.
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
measuringinputs doexceed60Vdc, thenfit scaling resistors externallytothe module. Theusermustensure thattheincorporation of theDPM
into the user’s equipment conforms to the relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring,
ControlandLaboratoryUse).
VARIOUS OPERATING MODES
ON-BOARD LINK S: 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 op en ed (cu t) o r sh o rted (so lde red ).
Do not connect more than one meter to the same power supply if the meters cannot
use the same signal ground. Input filter should be as close as possible to the meter.
Taking any input beyond the power supply rails will damage th e meter.
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
Measuring a floating voltage source
of 200mV full scale (DPM 2).
Measuring 4-20mA to read 0-999.
Supply MUST be isolated. (DPM 2)
Measuring a single ended input
referenced to supply (DPM 2S).
Split supply operation (DPM 2).
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV< V <200mV
V <2V . (DPM 2)
12
2
12
Measuring current. Supply MUST
be isolate d . (DPM 2)
Charge pump capacitor connections (DPM 2S only).
V+
V-
V+
10
4
2
5
3IN HI
IN LO
REF LO
COM
1
V-
+
-
±200mV
Check Link REF is SHORTED.
10nF
1M
V+
V+
10
2
4
5
3IN HI
IN LO
COM
REF LO
1V-
V-
Check Link REF is SHORTED.
10nF
220k
5k
6R2
1M
Iin
Iout
V+
V+
10
3
R4
5
IN HI
REF LO
IN LO
1V-
V-
R= 0.2
IFSR
V+
V+
10
6
2
5
3IN HI
IN LO
REF LO
REF HI
1
V-
V-
+
-
-
+
V1
V2
Check Link REF is OPEN.
Check Link REF is SHORTED.
10nF
1M
V+ +5V
V+
10
4
2
5
3IN HI
IN LO
REF LO
COM
CAP+
CAP-
9
V- 1
8
7
+
+
-
-
C2
1.5 Fµ
C1
1.5 Fµ
0V
GND
+
-
±200mV
Check Link REF is SHORTED.
10nF
1M
V+
V+
10
4
2
5
3IN HI
IN LO 14V max.
7V min.
1V
min.
REF LO
COM
1
V-
+
-
±200mV
Check Link REF is SHORTED.
10nF
1M
0V
P.O. Box 897, Windham, NH 03087
(603) 893-0886 (800) 821-0023 FAX (603) 898-6820
