Specifications liable to change without prior warning
DPM 3
Issue 4
August/1997
M.C.
Applies to DPM 3/1
PIN FUNCTIONS
ON BOARD LINKS
1. V-
DPM3- negativepower supplyconnection.
DPM3S - noconnection.
2. INLO
Negativemeasuringinput. Analogueinputs must benocloser than1Vtoeither thepositiveor negativesupply.
3. INHI
Positivemeasuringinput. Thenegativesupplyof theDPM3Sisgeneratedinternallyandmirrorsthepositivesupplyvoltage.
4. COM
Groundfor analoguesectionof A/Dconverter, it is activelyheldat 2.8VbelowV+andmust not beallowedtosinkexcessivecurrent
(>100 A) by, for instance, connectingtoahigher voltage.
5. REFLO Negativeinput for referencevoltage.
6. REFHI Positiveinput for referencevoltage(connectedviaLinkREFtointernal reference).
7. GND
DPM3- noconnection.
DPM3S- 0Vpower supplyconnection.
8. V+
Positivepower supply.
9. TEST.
Connect toV+todisplaysegments '-1888'. It shouldnot beoperatedfor morethanafewsecondsastheD.C. Voltageappliedtothe
LCDmay'burn' thedisplay. This pinis normallyat 5VbelowV+andisthegroundfor thedigital sectionof themeter.
10. XDP
Annunciator DriveWaveform, this is aninversionof theLCDbackplanesignal.
11. BAT
Pinnot factoryfitted. Connectingthis pintoXDP(pin10) will turnthebatteryannunciator on(ensureLinkBATis openwhen
drivingannunciator). SeeApplications for lowbatterysensingcircuit.
µ
Onboardlinks canbemadewithasolder linktoimplement features.
DP1 MaketoturnonDP1(199.9).
DP2 MaketoturnonDP2(19.99).
DP3 MaketoturnonDP3(1.999).
REF Factorymade- Connects internal referencetoREFHI. It shouldonlybecut if anexternal referenceis used.
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 andLaboratoryUse).
SAFETY
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. Input filter should be as close as possible to the meter.
Taking any input beyond the power supply rails will damage the meter.
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
Measuring a floating voltage source
of 200mV full scale (DPM 3).
Measuring current. Supply MUST be
isolated (DPM 3).
Measuring a single ended input
referenced to supply (DPM 3S ).
Split supply operation (DPM 3).
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV< V <200mV
V <2V . (DPM 3)
12
2
12
Driving battery annunciator with
associated logic and low battery
detection circuitry.
Check Link REF is SHORTED.
CheckLinkBAT is OPEN.
Check Link REF is OPEN.
Check Link REF is SHORTED.
Check Link REF is SHORTED.
V+
0V
V- (-7vmax.)
V+
8
4
2
5
3 IN HI
IN LO
REF LO
COM
1
1
V-
+
-
INPUT
VOLTAGE
10nF
1M
V+ +5V
V+
8
4
2
5
3 IN HI
IN LO
REF LO
COM
7 0V
GND
+
-
±200mV
10nF
1M
±200mV
V+
V+
8
6
2
5
3 IN HI
IN LO
REF LO
REF HI
1 V-
V-
+
+
-
-
V1
V2
10nF
1M
V+
V+
XDP
BAT
TEST
8
10
1
V-
1M
470k
1M
4077
11
9
SET
THRESHOLD
BC 237
V+ (7V max.)
V+
8
4
2
5
3 IN HI
IN LO
REF LO
COM
V-
+
-
10nF
1M
V+
V+
8
4
R
5
3 IN HI
IN LO
REF LO
1 V-
V-
R= 0.2
IFSR
P.O. Box 897, Windham, NH 03087
(603) 893-0886
(800) 821-0023
FAX (603) 898-6820
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