DPM 2000
15mm (0.6“) Digit Height
Programmable Decimal Points
Auto-zero
Auto-polarity
200mV d.c. Full Scale Reading (F.S.R.)
Single Rail Version
3
½ Digit LCD Module
The DPM 2000 uses advanced components and construction techniques to provide an unrivalled combination of high performance,
elegant appearance and low cost. The module uses a bandgap reference for extra temperature stability. For single rail operation, the
DPM 2000S features a built-in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0V.
Two resistors Ra and Rb may be fitted in order to alter
the full scale reading (F.S.R) of the meter - see table.
The meter will need re-calibration.
Required F.S.R.
2V
20V
200V
2kV
200
µ
A
2mA
20mA
200mA
NOTE
Note
Note
Note
Note
910k
1M
1M
1M
link
link
link
link
SCALING
Standard Meter
Single Rail Version
Accuracy (overall error) *
Linearity
Sample rate
Operating temperature range
Temperature stability
Supply voltage
DPM 2000
(V+ to V-)
DPM 2000S
Supply current
DPM 2000
DPM 2000S
Input leakage current (Vin = 0V)
Stock Number
Min.
Typ.
0.05
3
30
9
5
150
500
1
DPM 2000
DPM 2000S
Ra
100k
10k
1k
100R
1k
100R
10R
1R
Rb
Specification
Max.
0.1
±1
50
14
6.5
10
0
7.5
3.5
% (±1 count)
count
samples/sec
°C
ppm/°C
V
µ
A
pA
Unit
Ensure that link 10 is open if fitting Ra.
* To ensure maximum accuracy, re-calibrate periodically.
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).
DIMENSIONS
All dimensions in mm (inches)
72.0
(2.83)
a b
6
11 4 2 7
12
13
Display in TEST mode
67.5 (2.66)
60.0 (2.36)
Ø2.50
(0.10)
c d e
+
-
LMP
(1.42)
9
H5
8
ON BOARD
SOLDER LINKS
SCALING RESISTORS
36.0
14
1
Rb
Ra
5
10
3
f
g
m
Ω
M
K
DP1
DP2
DP3
~
:
-
pH
µ
%
V
g
°F
°C
A
a.
b.
c.
d.
e.
f.
g.
1.00
9.00
1.25
5.50
4.00
0.50
2.54
(0.04)
(0.35)
(0.05)
(0.22)
(0.16)
(0.02)
(0.10)
32.5 (1.28)
27.5 (1.08)
29.5 (1.16)
19.0 (0.75)
29.5 (1.16)
E3
BP
AB
POL
REF HI
REF LO
COM
I
L
XDP
-5V
CLK
XG3
V+
RBG
REF-
REF+
TEST
XB3
53.0 (2.09)
62.5 (2.46)
I
H
V-
Martel Electronics, Corp. P.O. Box 770 Londonderry, NH 03053
Toll Free: (800) 821-0023 Phone: (603) 434-1433 Fax: (603) 434-1653
PIN FUNCTIONS
1.
2.
3.
4.
V-
IH
IL
COM
Negative power supply connection.
Positive measuring input.
Analogue inputs must be no closer than 1V to either the positive or negative supply. The negative
Negative measuring input. supply of an S-type meter is generated internally and mirrors the positive supply voltage.
The ground for the analogue section of the A/D converter, held actively at 2.8V (nom.) below V+. COM must not be allowed to sink
excessive current (>100
µ
A) by connecting it directly to a higher voltage.
Negative input for reference voltage.
Positive input for reference voltage (connected via Link 1 to REF+).
Drive for negative (-) annunciator. Internally connected via Link 11 to the annunciator.
Outputs for autoranging applications.
LCD back plane drive waveform.
Positive output from internal reference (connected via Link 1 to REF HI).
Negative output from internal reference. MUST be tied to a suitable ground return to bias bandgap (normally COM).
Ouput of bandgap reference (1.22V nom).
Positive power supply connection.
Clock output. May be used for systems timing or as an input to override the internal oscillator and control the sample rate.
Output from negative rail generator circuit (DPM 2000S only). This is an inversion of V+.
Connect to required annunciators/DPs (see Special Note - Annunciators).
Connect to V+ to momentarily turn on segments as illustrated. 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 5V (nom) below V+ and is the ground for the digital section of the meter.
It can be used to power external logic up to a maximum of 1mA.
5. REF LO
6. REF HI
7. POL
8, 10, 15, 19
9. BP
11. REF+
12. REF-
13. R BG
14. V+
16. CLOCK
17. -5V
18. XDP
20. TEST
SPECIAL NOTE - ANNUNCIATORS.
The DPM annunciators (DPs, °C, etc.) can be displayed either by connecting to XDP
or by applying a solder blob link to the XDP pads located under the annunciator input
pads. However, as these annunciators are normally 'floating', under certain conditions
they may appear when not wanted. To suppress unwanted annunciators, apply a
solder blob to the backplane pads located in-between the annunciator input pads.
If the annunciators are being switched, connect them via M
Ω
resistor to the BP
(Pin 9), the annunciators will then operate normally when connected to XDP Ensure
.
that an annunciator is not connected directly to the XDP and BP at the same time.
Note - if suppressing POL (-) annunciator by direct connection to BP then Link 11
MUST be cut first.
RIGHT
ANNUNCIATOR
ANNUNCIATOR
BP
WRONG
ANNUNCIATOR
BP
ANNUNCIATOR
XDP
XDP
XDP
XDP
Link either BP or XDP
to annunciator.
Do not link BP & XDP
to the annunciator
at the same time
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. Taking any input beyond the power supply rails will
damage the meter.
14
V+
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
V+
±200mV
+
-
IN HI
3
IN LO
V-
1
2
±200mV
+
-
2
3
14
V+
IN HI
IN LO
V+
2
3
V+
14
V+
IN
HI
IN
LO
14V max.
7V min.
±200mV
+
-
0V
1vmin.
V-
1
V-
1
V-
V-
Check Links 2, 3 & 4 are SHORTED.
V-
Check Links 3 & 4 are SHORTED.
Check Links 3 & 4 are SHORTED.
Measuring a floating voltage source of 200mV
full scale.
14
V+
2
R
R= 0.2
I
FSR
3
IN
HI
IN
LO
Split supply operation (DPM 2000).
V+
14
V+
+
2
IN HI
3
-
IN LO
Measuring a single ended input
referenced to supply (DPM 2000S).
I
IN
100K
V+
V
1
V+
IN HI
13
REF BG
2
SET
ZERO
14
V+
V
2
+
6
REF HI
-
5
REF LO
V-
1
6R2
5K
3
4
IN LO
COM
V-
1
V-
1
V-
Check Links 2, 3 & 4 are SHORTED.
V-
Check Link 1 is OPEN.
V-
Check Links 3 & 4 are SHORTED.
I
OUT
Measuring current (supply MUST be isolated).
Measuring the ratio of two voltages.
Reading = 1000 V
1
/V
2
50mV < V
2
<200mV
V
1
< 2V
2.
DPM 2000
Issue 3
August/1997
Measuring 4-20mA to read 0-999
(supply MUST be isolated).
Specifications liable to change without prior warning
M.C.
Applies to DPM 2000/5
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