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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. V-
2. IH
3. IL
4. COM
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
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.
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 ? 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.
XDP XDP
RIGHT
ANNUNCIATOR ANNUNCIATOR
BP
Link either BP or XDP
to annunciator.
XDP XDP
WRONG
ANNUNCIATOR ANNUNCIATOR
BP
Do not link BP & XDP
to the annunciator
at the same time
damage the meter.
+
IN HI
+
3
2 ±200mV
-
IN LO
3 IN LO
-
VARIOUSOPERATINGMODES
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
V+
14 14
V+ V+
2
IN HI
±200mV
-
V+
14V max.
7V min.
Normally
SHORTED
Cut to
OPEN
+
±200mV
2
3
V+
14
V+
IN HI
IN LO
Normally
OPEN
Solder to
SHORT
V-
1
V-
Check Links 2, 3 & 4 are SHORTED.
Measuring a floating voltage source of 200mV
full scale.
0V V-
1vmin. 1
V-
Check Links 3 & 4 are SHORTED.
Split supply operation (DPM 2000).
V-
1
V-
Check Links 3 & 4 are SHORTED.
Measuring a single ended input
referenced to supply (DPM 2000S).
R= 0.2
14
V-
V+
IN LO
REF HI
V-
V+
V-
R
I FSR
2
3
V+
IN HI
IN LO
V-
1
V+
V 1
V 2
+
-
+
-
14
2 V+
IN HI
3
6
5 REF LO
V-
1
I IN
100K
6R2
5K
I OUT
SET
ZERO
2
13
3
4
V+
14
IN HI
REF BG
IN LO
COM
V-
1
Check Links 2, 3 & 4 are SHORTED.
Measuring current (supply MUST be isolated).
Check Link 1 is OPEN.
Measuring the ratio of two voltages.
Reading = 1000 V 1 /V 2
50mV < V 2 <200mV
V 1 < 2V 2.
Check Links 3 & 4 are SHORTED.
Measuring 4-20mA to read 0-999
(supply MUST be isolated).
Specifications liable to change without prior warning
DPM 2000
Issue 3
August/1997
M.C.
Applies to DPM 2000/5
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