PIN FUNCTIONS
SAFETY
A. DP1
199.9
B. DP2
19.99
C. DP3
1.999
D. CLOCK/ Connect to0Vtoholddisplayreading. Leaveopenfor normal operation.
HOLD
E. DPCOM Connect toPinA, Bor Ctoselect requiredDP.
1. +5V
Positivepower supplyinput.
2. COM
Thegroundfor theanaloguesectionof theconverter, heldactivelyat 2.8V(nom) below+5V. Thispinisfor useonlywhenthemodule
isusedwithafullyfloatingsupply.
3. INHI
Positivemeasuringinput.
Analogueinputsmust benocloser than1Vtothepositivesupplyor lower than1.5Vbelow0V.
4. INLO
Negativemeasuringinput.
5. 0V
Negativepowersupplyinput.
It shouldonnoaccount beconnectedtoanyother terminationsor circuitryexcept asspecifiedin
therelevant operatingmodes.
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).
VARIOUS OPERATING MODES
Operation with input referenced to panel
Operation with input floating with respect to
power supply.
+5V
+5V
+5V
+5V
IN HI
IN HI
IN LO
IN LO
0V
0V
+
-
INPUT
VOLTAGE
4
3
1
1
5
5
2
4
3
R
2
0V
0V
COM
COM
R= 0.2
IFSR
+5V
+5V
IN HI
IN LO
0V
+
-
INPUT
VOLTAGE
4
3
1
5
0V
0V
4
3
5
1
IIN
6R2
SET
ZERO
220k
5k
2
IN HI
IN LO
COM
IOUT
0V
+5V
+5V
Specifications liable to change without prior warning
DPM 40
Issue 3
August/1997
M.C.
Applies to DPM 40/6
P.O. Box 897, Windham, NH 03087
(603) 893-0886
(800) 821-0023
FAX (603) 898-6820
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