DPM 125
3½ Digit LCD Module
No.: 695 - Page 1 of 2
This compact LCD DPM is ideally suited for low or high volume applications. It features an exceptionally large display in a miniature
package. The meter will plug directly into a SIL socket or can be panel mounted using the snap in bezel provided. The low profile bezel
incorporates a flat reverse printed window giving a superb appearance that cannot be damaged or rubbed of by contact.
12.5mm (0.5“) Digit Height
Logic Selectable Decimal Points
Auto-zero
-+
Auto-polarity
200mV d.c Full Scale Reading (F.S.R.)
Low Battery Indication
SCALING
Two resistors may be used to alter the full scale reading of
the meter - see table.
Note that the meter will have to be re-calibrated by
adjusting the calibration pot .
Ra
Stock Number
Standard Meter
INPUT
Rb
IN LO (8)
-
Required F.S.R.
2V
20V
200V
2kV
200mA
2mA
20mA
200mA
Note
Ra
Rb
910k
1M
1M
10M
0R
0R
0R
0R
100k
10k
1k
1k
1k
100R
10R
1R
Min.
Accuracy (overall error) *
Linearity
Sample rate
Operating temperature range
Temperature stability
Supply voltage (V+ to V-)
Supply current
Input leakage current (Vin = 0V)
IN HI (7)
+
DPM 125
Specification
Typ.
Max.
Unit
0.05
0.1
±1
% (±1 count)
count
samples/sec
°C
ppm/°C
V
mA
pA
3
0
50
100
9
150
1
7.5
14
10
* To ensure maximum accuracy, re-calibrate periodically.
NOTE
Ensure Ra is rated for high voltage use.
DIMENSIONS All dimensions in mm (inches)
a
48 (1.89)
b
a. 1.50 (0.06)
b. 9.00 (0.35)
c. 5.00 (0.20)
d. 1.60 (0.06)
e. 4.00 (0.16)
f. 10.4 (0.41)
g. 7.50 (0.30)
h. 2.54 (0.10)
i. 0.50 (0.02)
Panel cut-out
45 x 22.2 (1.77 x 0.87)
24 (0.94)
14.0 (0.55)
31.0 (1.22)
Viewing Area showing
display in TEST mode
d
c
g
18.2 (0.72)
REAR VIEW
9
ON BOARD SOLDER LINKS
DP3 DP2 DP1
1
1
h
11
4
DP1
DP3
12
DP2
IN HI
V+
VTEST
COM
IN LO
ROH
RHI
RLO
f
20.4 (0.80)
40.5 (1.59)
38.0 (1.50)
i
3
2
12
e
1
PANEL FITTING
Fit the bezel to the front of the panel and then locate the meter into the bezel from behind. Alternatively the meter and bezel may be assembled
before fitting into the front of the panel but care must be taken not to use excessive force. Finally fit the window into the front of the bezel.
Specifications liable to change without prior warning
DPM 125
Issue 7
06/2010
S.L.
Applies to DPM 125/2
LASCAR ELECTRONICS LTD.
LASCAR ELECTRONICS INC.
LASCAR ELECTRONICS (HK) LTD.
MODULE HOUSE, WHITEPARISH,
WILTSHIRE SP5 2SJ UK
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
E-mail: sales@lascar.co.uk
4258 WEST 12th STREET,
ERIE, PA 16505 USA
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
E-mail: us-sales@lascarelectronics.com
8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN
ROAD, KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2389 6502 FAX: +852 2389 6535
E-mail: saleshk@lascar.com.hk
No.: 695 - Page 2 of 2
PIN FUNCTIONS
1.
2.
3.
4.
DP1
DP2
DP3
TEST
5.
6.
7.
8.
9.
VV+
IN HI
INLO
COM
10. RLO
11. RHI
12. ROH
199.9
19.99
Connect to V+ to display required DP.
1.999
Connect to V+ to display 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 normally at 5V 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.
Negative power supply connection.
Positive power supply connection.
Positive measuring differential input.
Analogue inputs must be no closer than 1V to either the positive or negative supply.
Negative measuring differential input.
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 (>100mA) by connecting it directly to a higher voltage.
Negative input for reference voltage (can be connected to COM via Link 3).
Positive input for reference voltage (connected via Link 1 to ROH).
Positive output from internal reference.
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).
VARIOUS OPERATING MODES
6
V+
+
±200mV
-
7
8
V+
6
V+
7
IN HI
+
±200mV
8
-
510K
7
14V max
7V min
IN LO
IN LO
0V
1V
min.
V5
VCheck Links 2 & 3 are SHORTED.
Measuring a floating voltage source
of 200mV full scale.
6
V+
7
IN HI
V1
6
V+
+ 7 IN HI
8
IN LO
V2
R=0.2
IF.S.R.
V5
V-
V+
Measuring current. Supply MUST
be isolated.
Specifications liable to change without prior warning
- 10 REF LO
V5
Issue 7
V5
V-
V+
6
7
IN HI
V+
100K
6R2
SET
5K
8
ZERO
9
IOUT
V-
Measuring the ratio of two voltages.
Reading = 1000 V1/V2
50mV< V2<200mV
V1<2V2.
DPM 125
IN LO
IIN
06/2010
IN LO
COM
V5
VCheck Link 3 is SHORTED.
Check Links 1 & 4 are OPEN.
Check Links 2 & 3 are SHORTED.
8
Measuring a supply voltage.
(min. 7.5V, max. 14V).
+ 11 REF HI
8 IN LO
IN HI
Check Link 3 is SHORTED.
Split supply operation.
V+
SUPPLY
VOLTAGE
510K
V-
6
V+
10K
V5
Check Link 3 is SHORTED.
R-
-
V+
V+
IN HI
+
Normally
OPEN
Solder to
SHORT
Normally
SHORTED
Cut to
OPEN
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 cut (opened) 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.
Measuring 4-20mA to read 0-999.
(supply MUST be isolated).
S.L.
Applies to DPM 125/2