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DPM 3
11mm (0.43") Digit Height Programmable Decimal Points Auto-zero Auto-polarity 200mV d.c. Full Scale Reading (F.S.R.)
31/2 Digit Subminiature LCD Module
The DPM 3 is the largest in our sub-miniature series of meters but still uses the same miniaturisation techniques to produce a very compact instrument. The snap-in integral bezel makes installation easy. For single rail operation, the DPM 3S features a built in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0V .
-
+
SCALING
A potential divider may be used to alter the full scale reading (F.S.R.) of the meter - see table. NOTES The meter will have to be re-calibrated by adjusting the calibration potentiometer at the rear of the module.
+
Ra INPUT Rb 1M
Standard Meter Single Rail Version Accuracy (overall error) * Linearity Sample rate Operating temperature range Temperature stability DPM 3 DPM 3S Supply voltage DPM 3 DPM 3S Supply current DPM 3 DPM 3S Input leakage current (Vin = 0V)
Stock Number Min. Typ.
0.1 3 200 100 9 5 150 250 1
DPM 3 DPM 3S
Specification
Max.
1 50 14 7 10
3
10nF
IN HI
-
2
IN LO
0 7 3
% (1 count) count samples/sec C ppm/C V A pA
Unit
Required F.S.R.
2V 20V 200V 2kV 200A 2mA 20mA 200mA
note
910k 1M 1M 10M 0R 0R 0R 0R
Ra
100k 10k 1k 1k 1k 100R 10R 1R
Rb
* To ensure maximum accuracy, re-calibrate periodically.
NOTE Ensure that Ra is rated for high voltage use.
DIMENSIONS All dimensions in mm (inches)
40.0 (1.57) 27.3 (1.07) a b c d
a. b. c. d. e. f. g. h.
2.00 6.00 1.60 6.00 2.54 0.50 6.00 2.00
(0.08) (0.24) (0.06) max (0.24) (0.10) (0.02) (0.23) (0.08)
Panel cut-out 38.0 x 18.0 (1.50 x 0.71) Panel thickness 1.0 to 2.5 (0.04 to 0.1)
ON BOARD SOLDER LINKS
20.0 (0.79)
12.7 (0.50)
e
11
f
1
g h
REF 11 1
REF HI
REF LO
IN HI
COM
V+
GND
17.5 (0.69)
IN LO
BAT
TEST
XDP
V-
DP1 DP2 DP3 BAT
37.5 (1.48)
PANEL FITTING
Locate the meter by passing 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 PUSH ON THE LCD). The snap-in lugs will now automatically hold the meter firmly in position.
P.O. Box 897, Windham, NH 03087 (603) 893-0886 (800) 821-0023 FAX (603) 898-6820 PIN FUNCTIONS
1. VDPM 3 - negative power supply connection. DPM3S - no connection. 2. IN LO Negative measuring input. Analogue inputs must be no closer than 1V to either the positive or negative supply. 3. IN HI Positive measuring input. The negative supply of the DPM 3S is generated internally and mirrors the positive supply voltage. 4. COM Ground for analogue section of A/D converter, it is actively held at 2.8V below V+ and must not be allowed to sink excessive current (>100A) by, for instance, connecting to a higher voltage. 5. REF LO Negative input for reference voltage. 6. REF HI Positive input for reference voltage (connected via Link REF to internal reference). 7. GND DPM 3 - no connection. DPM 3S - 0V power supply connection. 8. V+ Positive power supply. 9. TEST. Connect to V+ to display segments '-1888'. It should not be operated for more than a few seconds as the D.C. Voltage applied to the LCD may 'burn' the display. This pin is normally at 5V below V+ and is the ground for the digital section of the meter. 10. XDP Annunciator Drive Waveform, this is an inversion of the LCD backplane signal. 11. BAT Pin not factory fitted. Connecting this pin to XDP (pin 10) will turn the battery annunciator on (ensure Link BAT is open when driving annunciator). See Applications for low battery sensing circuit.
ON BOARD LINKS
On board links can be made with a solder link to implement features. DP1 Make to turn on DP1 (199.9). DP2 Make to turn on DP2 (19.99). DP3 Make to turn on DP3 (1.999). REF Factory made - Connects internal reference to REF HI. It should only be cut if an external reference is used.
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 Electrical Equipment for Measuring, Control and Laboratory Use).
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.
1M 10nF
VARIOUS OPERATING MODES
Normally SHORTED Cut to OPEN
Normally OPEN Solder to SHORT
V+ +5V 8 V+ 3 IN HI 2 4 5 IN LO
INPUT VOLTAGE -
+
8 V+ V+ 3 IN HI 2 4 5 IN LO
200mV
+ -
1M 10nF
8 V+ 3 IN HI 2 4 5 IN LO
V+ (7V max.)
200mV
+ -
1M 10nF
COM REF LO V1
COM REF LO V1
COM REF LO GND 7
0V
Check Link REF is SHORTED.
V- (-7vmax.) Check Link REF is SHORTED.
0V
Check Link REF is SHORTED.
Measuring a floating voltage source of 200mV full scale (DPM 3).
8 V+ 3 IN HI 4 IN LO 5 REF LO V1 V+
Split supply operation (DPM 3).
Measuring a single ended input referenced to supply (DPM 3S ).
8 V+ V+
R
R= 0.2 IFSR
V1 V2 V-
+ + -
1M 10nF
8 V+ 3 IN HI 2 6 5 IN LO
V+
4077 1M 1M
10
11 9
XDP BAT TEST
REF HI REF LO V1
BC 237 470k SET THRESHOLD
V-
V1
Check Link REF is OPEN.
Check Link BAT is OPEN.
Measuring current. Supply MUST be isolated (DPM 3).
Measuring the ratio of two voltages. Reading = 1000 V1/V2 50mV< V2<200mV V1<2V2. (DPM 3) DPM 3 Issue 4 August/1997
Driving battery annunciator with associated logic and low battery detection circuitry. M.C. Applies to DPM 3/1
Specifications liable to change without prior warning

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