DPM950S LASCAR, DPM950S Datasheet - Page 2

• Manufacturer Part Number: DPM950S
• Description: DPM, LCD, 3.5DIGIT, NEGATIVE RAIL
• Manufacturer: LASCAR

Specifications of DPM950S

• Supply Voltage Range: 3.5VDC To 6.5VDC
• No. Of Digits / Alpha: 3.1/2
• Display Size: 51mm X 24mm
• Panel Cutout Height: 40mm
• Panel Cutout Width: 72mm
• Operating Temperature Range: 0°C To +50°C
• Svhc: No
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIN FUNCTIONS
18 & 32. BP
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).
11. REF LO
12. REF HI
13. XDP
14. DP1
15. DP2
16. DP3
23. REF-
24. REF+
25. LO BAT
26. REF BG
27.
28. :
29. -
30. POL
31. CLK
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. LP-
2. LP+
3. V-
4. V+
5. -5V
6. TEST
7. IN LO
8. IN HI
9. COM
Specifications liable to change without prior warning
Measuring a floating voltage source
of 200mV full scale.
Measuring current. Supply MUST
be isolated.
Check Links 2 & 3 are SHORTED.
±200mV
Check Links 2 & 3 are SHORTED.
Negative power supply to LED backlighting.
Positive power supply to LED backlighting.
Negative power supply connection.
Positive power supply connection.
Output from negative rail generator circuit. This output is an inversion of V+ (DPM 950S only).
Connect to V+ to display all segments except DPs. 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 measuring differential input. Analogue inputs must be no closer than 1V to either positive or negative supply. The negative
Positive measuring differential input.
Ground for the analogue section of the A/D converter, it is actively held at approximately 2.8V below V+ and must not be allowed to
Negative input for reference voltage. Can be connected to COM via link 3.
Positive input for reference voltage. Connected via link 1 to internal reference.
Annunciator Drive Waveform, this is an inversion of the backplane.
199.9
19.99
1.999
LCD backplane drive waveform.
Negative output from internal reference.
Positive output from internal reference.
Used to control the low battery annunciator externally, cut link 12 and take to V+ to turn on annunciator.
The annunciator turn on point can also be set by adjusting the BAT potentiometer (R10), in which case do
not connect to this pin and leave link 12 intact.
Output from internal bandgap reference. (Factory fitted option.)
Alarm annunciator, cut link ALM and take to XDP to display.
Colon annunciator, cut link COL and take to XDP to display.
Polarity annunciator, connected via link 11 to polarity output of IC1. Cut link 11 and either take to XDP to
display or make other side of link 11 to hold off.
Polarity output of IC1.
May be used to override the internal oscillator and control the sample rate. Link 14 must then be made.
sink excessive current (>100 A) by, for instance, connecting to a higher voltage.
R
R=
+
-
I
0.2
FSR
TEL: [phone] FAX: [phone]
Connect to V+ to display required Decimal Point or short corresponding DP link.
8
7
8
7
IN LO
IN HI
IN LO
IN HI
MODULE HOUSE, WHITEPARISH,
V+
LASCAR ELECTRONICS LTD.
V+
V-
V-
3
4
3
4
E-mail: [e-mail]
WILTSHIRE SP5 2SJ UK
V+
V-
V+
V-
m
supply of the DPM 950S is generated internally and mirrors the positive supply voltage.
±200mV
Split rail supply (DPM 950)
Measuring the ratio of two voltages.
Reading = 1000 V /V
50mV <
DPM 950
1V min
Check Links 1 & 4 are OPEN.
0V
TEL: [phone] FAX: [phone]
V
V
1
2
Check Link 3 is SHORTED.
+
+
-
E-mail: [e-mail]
+
-
-
V
LASCAR ELECTRONICS INC.
2
<200mV
12
11
8
7
4258 WEST 12th STREET,
8
7
V+
ERIE, PA 16505 USA
IN LO
IN HI
IN LO
REF HI
REF LO
IN HI
1
V-
V+
V+
V-
Issue 11
3
4
4
3
2
V+
V-
V < 2V
1
14V max
7V min
V-
2.
06/2010
8th FLOOR, CHINA AEROSPACE CENTRE, 143 HOI BUN
±200mV
ROAD, KWUN TONG, KOWLOON, HONG KONG
Measuring 4-20mA to read 0-999
(supply MUST be isolated).
Measuring a single ended input
referenced to supply (DPM 950S).
TEL: [phone] FAX: [phone]
6R2
S.L.
LASCAR ELECTRONICS (HK) LTD.
I
I
OUT
IN
Check Link 3 is SHORTED.
220k
Normally
SHORTED
Cut to
OPEN
E-mail: [e-mail]
+
Check Link 3 is SHORTED.
5k
-
Zero
Set
Only Pins 1-16 are fitted,
these functions are
available but a connector
is not provided.
7
9
8
7
8
IN
IN
IN
IN
COM
Applies to DPM 950/4
HI
LO
V+
HI
LO
V+
V-
V-
4
3
4
3
V+
V+
V-
V-
Normally
OPEN
Solder to
SHORT