DPM1AS-BL
3½DigitBacklitLCDVoltmeterModule
PRODUCT DESCRIPTION
TheDPM1AS-BLfeaturesa200mVd.c.measurementrangewithauto-zeroandauto-polarity.Decimalpointsareuser
selectable.
to its own power supply GND. The design
of the panel meter's housing allows the module to be low cost means it will
The DPM 1AS-BL features a negative rail generator which enables the meter to measure a signal referenced
LED backlighting ensures excellent readability under low light conditions.
easily snapped into a panel. The module's
suit high and low volume applications. The DPM 1AS-BL is intended to replace the DPM 1, DPM 1S, DPM 1-BL and
DPM 1S-BL in manyapplications,usuallyrequiring only minor circuit modifications.
FEATURES
mm (0.22") Digit Height
• 5.5
• 200mV d.c. Full Scale Reading
• 3.0 to 7.5V or 6.0 to 15.0V Operation
•
Auto-zero and Auto-polarity
•
Programmable Decimal Points
•
LED Backlighting
TYPICAL APPLICATIONS
• Precision Instrumentation Systems
• Power Supply Monitoring
• Hand held instruments
• Panel-Mount Indication
• Low Power Voltage Measurement
ORDERING INFORMATION
Stock Number
StandardMeterDPM1AS-BL
ELECTRICAL SPECIFICATIONS
Specification Min. Typ. Max. Unit
Accuracy (overall error) * 0.1 % (±1 count)
Linearity ±1 count
Sample rate 2.5 samples/sec
Operating temperature range 0 50 °C
Temperature stability 250 ppm/°C
Meter supply voltage V+ to GND configuration 3.0 5.0 7.5 V d.c.
Meter supply current V+ to GND configuration 350 A
Backlight supply voltage 4.75 5.0 *** V d.c.
Backlight supply current @ 5V d.c. 15 30**** mA
Input leakage current (Vin = 0V) 1 10 pA
* To ensure maximum accuracy, re-calibrate periodically.
** Operation of the meter beyond the maximum supply voltage rating may cause permanent damage to the meter.
*** An external series resistor is required above 5V, see Applications.
**** This specification linearly derates to 20mA @ 50°C.
Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and are tested with the module configured for single ended
input mode.
V+ to V- configuration 6.0 9.0 15.0** V d.c.
µ
V+ to V- configuration
A supply clock
175 A
µ
SAFETY
Tocomply with the LowVoltage Directive (LVD 93/68/EEC), input voltages to themodule’s pins must not exceed
60Vdc. The user must ensure that the incorporation of the panel meter intotheuser’s equipmentconformsto the
relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and
Laboratory Use).
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DPM1AS-BL
DIMENSIONS
All dimensions in mm (inches)
3½DigitBacklitLCDVoltmeterModule
Panel cut-out: 28.4 x 11.4
(1.12 x 0.45)
PANEL FITTING
Panel
Module
14.0 (0.55)
11.0 (0.43)
0.50 (0.02)
pin width
Panel thickness: 1.0 - 2.5
(0.04 - 0.10)
30.0 (1.18)
28.0 (1.10)
2.00 (0.08)
pin pitch
c
ab d
1.26 (0.05)
5.00 (0.20)
a. 2.00 (0.08)
b. 6.00 (0.24)
c. 1.60 (0.06)
d. 6.00 (0.24)
1
FUNCTIONAL BLOCK DIAGRAM
BL-
8
1
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INHI
INLO
V+
Vref
CAL
+
_
A/D
V-
DP3 2 1 XDPGND
2
DP1
LCOM
DP2
(rear view)
XDP
DP3
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PIN CONFIGURATION
GND
CAL
V-
INHI
BL-
INLO
LXDP
110
V+
DPM1AS-BL
CIRCUIT DIAGRAM
3½DigitBacklitLCDVoltmeterModule
PIN FUNCTIONS
1. V+ Positive power supply tothemeter.
2. GND 0Vpowersupply to themeter (3.0to 7.5V meterpower supply applications only).
3. V- Negative power supplyto the meter (6.0to 15.0V meterpower supplyapplications only).
4. BL- Connectto the meter's negative supply voltageto switch on theLED backlighting.
Formeter supply voltages above 5V, add aseries resistor Rs.
See Applications forsuitable circuit diagrams.
5. INHI Positive measuring input.
6. INLO Negative measuring input.
7. DP1 Connect to XDPto display DP1 (199.9).
8. DP2 Connect to XDPto display DP2 (19.99).
9. DP3 Connect to XDPto display DP3 (1.999).
10. XDP Connect to pin 7, 8 or 9 to display required decimal point.
Note:
A negative supply is generated internally and mirrors the positive supply. For example: if V+is +5V, then
the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as
that of thepanel meter, thenthe limitations on theinput rangeare (V- + 1.5V)to (V+- 1.5V).
Solder Links:
LCOM Normally Open. Connects INLO toCOM.
LXDP Normally Closed. Cut thislink to disable theinternal decimal pointdrive circuit and thereby
reduce the meter'scurrent consumption.
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DPM1AS-BL
3½DigitBacklitLCDVoltmeterModule
SCALING
Two external resistors Ra
and Rb may be used to
alter the full scale reading
(FSR) of the meter - see
table. The meter will have
to be re-calibrated by
adjusting the calibration
potentiometer on the rear
of the module.
Voltage
(Vin) 200V 1M 1k
Current
I
( in) 20mA 0R 10R
*Ensure that Ra is rated for high voltage use.
FSR Ra Rb
2V 910k 100k
20V 1M 10k
2000V* 1M 100R
200 A 0R 1k
µ
2mA 0R 100R
200mA 0R 1R
+
Vin or inI
-
Ra
Rb
INHI
DPM 1AS-BL
INLO
APPLICATIONS
Do not connect more than one meter to the same power supply if the meters cannot use the same signal
ground. Taking anyinput beyondthe power supply rails will damage the meter.
5V supply operation (3.0 to 7.5V Meter Power Supply)
+3.0 to +7.5V
+
5
±200mV
-
Measuring a single ended input
voltage referenced to supply, i.e. the
input voltage and the meter's power
supply share the same 0V rail.
Ensure solder link LCOM is open.
6
INHI
INLO
1
V+
DP1
DP2
DP3
XDP
GND
2
No DP
7
8
9
10
0V
+3.0 to +7.5V
55
+
INHI
±200mV
-
Measuring an input voltage referenced to
a floating supply, i.e. the input voltage
and the meter's power supply are isolated
from each other.
Ensure solder link LCOM is closed.
66
INLO
9V supply operation (6.0 to 15.0V Meter PowerSupply)
+3.0 to +7.5V
+
±200mV
-
-3.0 to -7.5V
11 1
V+
55
INHI
4
BL-
6
INLO
V-
33 3
+6.0 to +15.0V
+
±200mV
Rs=(V+) - (V-) - 5V
0.015
INHI
-
66
INLO
11
V+
4
BL-
if V+>5V then
GND
22
Rs=(V+ - 5V)
0V
+3.0 to +7.5V
V+
I+
Rb
I-
0.015
INHI
INLO
GND
0V
Measuring a current from a circuit which is
floating with respect to the DPM's supply,
i.e. the current and the meter's power
supply are isolated from each other.
Ensure solder link LCOM is closed.
+6.0 to +15.0V
V+
V-
BL-
4
Rs=(V+ - 5V)
0.015
0V
I+
Rb
I-
5
V+
INHI
INLO
V-
0V
Measuring a single ended input
voltage referenced to supply, i.e. the
input voltage and the meter's power
supply share the same 0V rail.
Ensure solder link LCOM is open.
SpecificationsliabletochangewithoutpriorwarningDPM1AS-BLIssue3February/2002M.C.AppliestoDPM1AS-BL/2
Measuring an input voltage referenced to
a floating supply, i.e. the input voltage
and the meter's power supply are isolated
from each other.
Ensure solder link LCOM is closed.
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Measuring a current from a circuit which is
floating with respect to the DPM's supply,
i.e. the current and the meter's power
supply are isolated from each other.
Ensure solder link LCOM is closed.
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