DPM500-BL Datasheet, PDF (2/2 Pages) List of Unclassifed Manufacturers – 3½ Digit Backlit LCD Module

LASCAR ELECTRONICS LTD.
MODULE HOUSE, WHITEPARISH,
WILTSHIRE SP5 2SJ UK
TEL: [phone] FAX: [phone]
E-mail: [e-mail]
LASCAR ELECTRONICS INC.
3750 West 26th Street,
Erie, PA 16506 USA
TEL: [phone] FAX: [phone]
E-mail: [e-mail]
LASCAR ELECTRONICS (HK) LIMITED
FLAT C, 5/FL., LUCKY FTY. bldg., 63-65 HUNG TO ROAD
KWUN TONG, KOWLOON, HONG KONG
TEL: [phone] FAX: [phone]
E-mail: [e-mail]
PIN FUNCTIONS
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
23. DP3
LCD backplane drive waveform.
1.999
24. DP2
19.99 See SPECIAL NOTE: ANNUNCIATORS.
25. DP1
199.9
26. V-
Negative power supply.
27. XDP
28. -5V
Connect to required annunciators/DPs (see note).
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.
31. IN HI
Positive measuring input.
Analogue inputs must be no closer than 1V to either the positive or negative supply.
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
33. REF-
excessive current (> 100µA) by connecting it directly to a higher voltage.
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.
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.
Normally
SHORTED
Cut to
OPEN
Normally
OPEN
Solder to
SHORT
1 ^V+
V+
±200mV
+ ³¹ IN HI
- ³⁰ IN LO
V-
26
V-
Links 1, 2, 3 & 4 SHORTED.
Measuring a floating voltage
source of 200mV full scale.
+
±200mV
-
1
V+
31 _{IN HI}
30 _{IN LO}
V+
14V max
7V min
0V
1V min
V-
26
V-
Links 1, 3 & 4 SHORTED.
Split supply operation.
V+
1
31 _{IN HI} ^V+
R
30
IN LO
R=
0.2
IFSR
V-
26 _V-
Links 1, 2, 3, 4 SHORTED.
Measuring current
(supply MUST be isolated).
V+
1
+
31
V+
IN HI
V1 _{- 30 IN LO}
+ ³⁶ REF HI
V2 _{- 35 REF LO}
V-
26
V-
Measuring the ratio of two voltages.
Reading = 1000 V1/V2
50mV< V2<200mV
V1<2V2.
IIN
6R2
IOUT
V+
1
31
IN
V+
HI
220K
5K
30 _{IN LO}
32 _COM
V-
26
V-
Links 1, 3 & 4 SHORTED.
Measuring 4-20mA to read 0-999
(supply must be isolated).
Specifications liable to change without prior warning
DPM 500-BL
Issue 6
August/2002
M.C.
Applies to DPM 500/7