DPM 500-BL
12.5mm (0.5“) Digit Height
Programmable Decimal Points
Auto-zero
Auto-polarity
200mV d.c. Full Scale Reading (F.S.R.)
LED Backlit
Annunciators
-
+
3½ Digit Backlit LCD Module
The DPM 500-BL uses advanced components and construction techniques to provide a uniquely compact unit. The meter is in a 40 pin DIL
integrated circuit format that can be plugged directly into a DIL socket or panel mounted using the snap in bezel.
°
C
°
F
µA
mV
kΩ
MHz
SCALING
Two resistors Ra and Rb may be fitted in order to alter the
full scale reading (F.S.R.) of the meter - see table.
Meter will need re-calibration.
Backlit Version
Stock Number
DPM 500-BL
Specification
Required F.S.R.
2V
20V
200V
2kV
200
µ
A
2mA
20mA
200mA
Note
Note
Note
Note
910k
1M
1M
1M
0R
0R
0R
0R
Ra
100k
10k
1k
100R
1k
100R
10R
1R
Rb
Accuracy (overall error)*
Linearity
Sample rate
Operating temperature range
Temperature stability
Supply voltage
Supply current
Backlight voltage
Backlight current
Input leakage current (Vin = 0V)
Min.
Typ.
0.05
3
100
9
150
5
30
1
Max.
0.1
±1
50
14
60
10
0
7.5
% (±1 count)
count
sample/sec
°C
ppm/°C
V
µ
A
V
mA
pA
Unit
NOTE
Ensure link 10 is cut if fitting Ra.
* To ensure maximum accuracy, re-calibrate periodically.
CONNECTOR SOURCING GUIDE
METHOD
40 Pin DIL IC Socket
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)
60.0 (2.36)
PANEL FITTING
1.1 8.2
(0.04) (0.32)
45.0 (1.77)
Display in TEST mode
Fit the bezel to the front of the
panel and locate the meter into
the bezel from behind.
Alternatively the meter and
bezel may be assembled before
fitting to 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.
30.0 (1.18)
5.0
(0.19)
1
7
52 (2.05)
12
:
E3
~
12.1 (0.48)
20
4.0 (0.16)
9
11
20
8
24.8 (0.98)
16.0 (0.63)
15.2 (0.60)
V+
V
m
A
°F
°C
µ
8.5 (0.33)
+
40
21
V+
Ω
Hz
TEST
REF
HI
REF
LO
REF+
REF-
COM
IN HI
IN LO
BG
-5V
XDP
V-
DP1
DP2
DP3
XG3
BP
-
AB
POL
XB3
+
40
-
1
7
13 12
3
10
5
12
15
14
M
K
-
Rb
1
2
Ra
7
4
ON-BOARD LINKS
OPTIONAL SCALING
RESISTORS
21
1.87
(0.07)
0.5
(0.02)
2.54
(0.1)
4.8
(0.19)
REAR VIEW
Panel cut-out = 57 x 27 (2.24 x 1.06)
www.lascarelectronics.com
MODULE HOUSE, WHITEPARISH,
WILTSHIRE SP5 2SJ UK
TEL: +44 (0)1794 884567 FAX: +44 (0)1794 884616
E-mail: sales@lascar.co.uk
LASCAR ELECTRONICS LTD.
3750 West 26th Street,
Erie, PA 16506 USA
TEL: +1 (814) 835 0621 FAX: +1 (814) 838 8141
E-mail: us-sales@lascarelectronics.com
LASCAR ELECTRONICS INC.
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: +852 2797 3219 FAX: +852 2343 6187
E-mail: b4lascar@samsongroup.com.hk
LASCAR ELECTRONICS (HK) LIMITED
1, 40. V+
Positive power supply.
2 -7, 12-14, 17, 38, 39 See
SPECIAL NOTE: ANNUNCIATORS.
15. -
Input for the polarity annunciator. Internally linked to POL (pin 20). If this is to be externally controlled, cut link 11.
16, 18, 19, 22
XB3, E3, AB, XG3. Outputs for use in auto-ranging applications.
20. POL
Drive for "-" annunciator. Internally connected by link 11.
21. BP
LCD backplane drive waveform.
23. DP3
1.999
24. DP2
19.99 See
SPECIAL NOTE: ANNUNCIATORS.
25. DP1
199.9
26. V-
Negative power supply.
27. XDP
Connect to required annunciators/DPs (see note).
28. -5V
Not connected.
29. BG
Input for bandgap reference. (1.22V nom).
30. IN LO
Negative measuring input.
Analogue inputs must be no closer than 1V to either the positive or negative supply.
Analogue inputs must be no closer than 1V to either the positive or negative supply.
31. IN HI
Positive measuring input.
32. COM
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.
33. REF-
Negative output from internal reference.
34. REF+
Positive output from internal reference.
35. REF LO
Negative input for reference voltage.
36. REF HI
Positive input for reference voltage.
37. TEST
Connecting this pin to V+ turns on the segments as illustrated. It should not be operated for more than a few seconds as the DC
voltage applied to the LCD may "burn" the display. This pin is nominally at 5V below V+ and is the ground for the digital section
of the meter, it can be used as a negative supply to power external logic up to a maximum of 1mA.
40. V+/CLK Normally tied to V+ via Link 12 but can be used to over ride the internal oscillator and control the sample rate by cutting Link 12 and
making Link 13.
LED BACKLIT VERSIONS:
Apply 5V DC to the backlight tab on the side of the meter. Typical current is 30mA. For higher voltages, fit a resistor in series.
E.g. For 9V use 150R. Maximum current = 60mA.
.
ANNUNCIATORS:
The DPM annunciators (DPs, °C, etc.) can be displayed by connecting them to XDP However as these annunciators are normally
‘floating’, under certain conditions they may appear when not wanted. To suppress unwanted annunciators, link them to the backplane (BP). If the
annunciators are being switched, connect them via a 1M resistor to the BP (pin 21). 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.
.
PIN FUNCTIONS
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.
1
V+
V+
+
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
+
±200mV
31
30
IN HI
IN LO
V-
26
±200mV
-
1
V+
31 IN HI
30
IN LO
V+
14V max
7V min
-
0V
1V min
V-
26
V-
Links 1, 2, 3 & 4 SHORTED.
V-
Links 1, 3 & 4 SHORTED.
Measuring a floating voltage
source of 200mV full scale.
1
Split supply operation.
V+
V+
V+
V
1
31
IN HI
V+
R
R= 0.2
I
FSR
1
V+
31
+
IN HI
30
-
IN LO
I
IN
1
V+
31
IN
HI
220K
30
IN LO
V
2
26
+
36
REF HI
6R2
5K
30
32
V-
V-
Links 1, 2, 3, 4 SHORTED.
-
35 REF LO
V-
26
IN
LO
V-
I
OUT
COM
V-
26
V-
Links 1, 3 & 4 SHORTED.
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 500-BL
Issue 6
August/2002
Measuring 4-20mA to read 0-999
(supply must be isolated).
Specifications liable to change without prior warning
M.C.
Applies to DPM 500/7
Embedded System
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