Datel DMS-30PC Series User manual

DATEL, Inc., Mansfield, MA 02048 (USA) •Tel: [phone] Fax: [phone] • Email:[email protected] • Internet: www.datel.com
Features
Figure 1. DMS-30PC Series Simplified Schematic
The DMS-30PC Series is a broad line of self-contained, fully operational, 3½
digit voltmeters with large, easy-to-read LED displays. The 0.56"(14.2mm) high
LED's are available in a wide variety of colors including red, orange, amber, yellow,
green, aqua and blue. A high-intensity version of the red display is optional as are
low-power versions of the red, orange and green displays.
The small size (2.17" x 0.92" x 0.56") of DMS-30PC meters is achieved by
integrating their display, display drivers, reference circuit, and A/D converter into in a
single, epoxy-encapsulated assembly.The device's 12-pin, component-like, DIP
package is both vibration and moisture proof. Each package incorporates a built-in
color filter and bezel and is easily mounted in either panels or pc cards.
These meters are available in four differential input voltage ranges (±200mV,
±2V, ±20V and ±200V). Input impedance is 1,000 megohms for the ±200mV and
±2V inputs and 1 megohm for the ±20V and ±200V inputs. CMRR for all devices is
86dB, and inputs are overvoltage protected to ±250V.
Each meter incorporates an extremely stable, double-regulated reference and is
fully calibrated prior to potting. We guarantee outstanding initial accuracy (±1 count)
and excellent stability (±0.15 counts/°C). All models operate from a single +5V
supply, and the low-power models draw as little as 10mA (50mW total power). A
DISPLAY TEST function is standard on each device.
For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and
K thermocouples, etc.), the DMS-30PC Series includes a complete line of optional
"plug-on" application boards that conveniently convert your meter into an applica-
tion-specific instrument.
••
••
•Large (0.56"/14.2mm) LED display
••
••
•7 LED colors
••
••
•Low-power LED’s optional
••
••
•Epoxy-encapsulated,12-pin DIP with
built-in color filter and bezel
••
••
•Miniature size:
2.17" x 0.92" x 0.56"
55mm x 23mm x 14mm
••
••
•Panel or pc-board mountable
••
••
•4 differential input voltage ranges
••
••
•Auto-calibration,±1 count accuracy
••
••
•User-selectable decimal point placement
••
••
•Single +5V supply (60mW for low-power
models)
••
••
•0 to +60°C temperature range
••
••
•Numerous "plug-on" application
boards
••
••
•Low cost
Actual Size
3½ Digit, LED Display
Low-Power, Miniature
Digital PanelVoltmeters
DMS-30PC Series
+1.23V REFERENCE OUT
(+) INPUT HI
(–) INPUT LO
ANALOG
COMMON
REFERENCE OUT
REFERENCE IN
+5V SUPPLY
R1
DP 1
DP 2
DP 3
6
5
49
11
12
10
8
7
1
3
DC/DC
CONVERTER
2
DISPLAY TEST
5V RETURN
+5V
–5V
+5V
1.23V
REF.
R2
≈
+2.0V
DATA
909k
R2 is not used on ±200mV (-0) models or ±2V (-1) models.
R2 = 100k on ±20V
(
-2
)
models and 9.1k on ±200V
(
-3
)
models.
V+
V–
A/D
CONVERTER
0 Vdc
0.01µF
1.82k
1
1
®®
查询DMS30PC供应商查询DMS30PC供应商

2
Performance/Functional Specifications
Typical atTA= +25°C and supply voltage = +5V using the single-ended input circuit,
unless otherwise noted.
DMS-30PC 3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS
DMS-30PC-1 - RS
LED Color:
AS = Standard Amber
BS = Standard Blue
GS = Standard Green
OS = Standard Orange
QS = Standard Aqua
RS = Standard Red
YS = StandardYellow
RH = High-Intensity Red
GL = Low-Power Green
OL = Low-Power Orange
RL = Low-Power Red
Technical Notes
1. +1.23V REFERENCE OUTPUT (Pin 9): This pin is the output of the
meter’s precision +1.23V internal reference, and it is referenced to
ANALOG COMMON (pin 10) which sits at a potential of approxi-
mately +2V. This output should be buffered if used to drive external
loads since sourcing more than 15µA from pin 9 can affect both the
initial accuracy and temperature drift of the meter.
2. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, "relative" ground. It is used in certain differential and
"floating" measurements as described in the Applications section of
this data sheet and Ap Note 3 of the DATEL Panel Meter Catalog.
Pin 10 should not be connected to pin 3 (5V RETURN) or to your
system’s analog ground.
3. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a
precision reference actively trimmed at the factory. In normal
operation, pin 8 must be tied to pin 7 to achieve all listed accuracy
and drift specifications.
Accessories:
DMS-30-CP Panel cutout punch
DMS-BZL1 DMS-30 bezel assembly
DMS-BZL2 DMS-30 bezel assembly with sealing gasket
RN-DMS Gain/offset potentiometer kit for DMS-EB,
DMS-EB-AC/DC and DMS-EB-DC/DC
Add-On Application Boards:
DMS-EB Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-HTB High-accuracy temperature probe sensing for
±200mV models
DMS-EB-DC/DC Provides isolated +5V power
DMS-EB-TCJ J-type thermocouple inputs for ±2V models
DMS-EB-TCK K-type thermocouple inputs for ±2V models
DMS-EB-RMS For true rms measurements of ac voltages
DMS-EB-AC/DC For ac line-powered applications
DMS-EB-LP For 4-to-20mA loop-powered applications
Input Range:
0= ±200mV
1= ±2V
2= ±20V
3= ±200V Available on the
following models only:
-GS (Standard Green)
-RS (Standard Red)
-RL (Low-Power Red)
Ordering Information
➀Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11)
with (–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected
(see Figure 1).Voltages applied to pin 12 should not exceed the supply voltage.
➁See Technical Notes.
Analog Inputs Min. Typ. Max. Units
Full Scale Input Range:
DMS-30PC-0 -- ±200 -- mV
DMS-30PC-1 -- ±2 -- Volts
DMS-30PC-2 -- ±20 -- Volts
DMS-30PC-3 -- ±200 -- Volts
Input Impedance:
DMS-30PC-0, -1 100 1000 -- MΩ
DMS-30PC-2, -3 0.8 1 -- MΩ
Overvoltage Protection ➀-- -- ±250 Volts
Common Mode Voltage Range -- -- ±2 Volts
CMRR (dc to 60Hz) -- 86 -- dB
Control Inputs ➁
Decimal Point Placement (Pins 4-6) Tie to pin 3 to activate
DisplayTest (Pin 2) Tie to +5V to activate all segments
Performance
Sampling Rate 2.5 samples per second
Accuracy (3 minute warm-up):
DMS-30PC-0 (VIN = +0.19V) -- ±1 ±2 Counts
DMS-30PC-1 (VIN = +1.9V) -- ±1 ±2 Counts
DMS-30PC-2 (VIN = +19V) -- ±2 ±3 Counts
DMS-30PC-3 (VIN = +190V) -- ±2 ±3 Counts
Zero Reading (VIN = 0Volts) "–001" "000" "001"
Temperature Drift (0 to +60°C) -- ±0.15 ±0.3 Cnts/°C
+1.23V Reference Output (Pin 9) ➁ +1.20 +1.23 +1.25 Volts
Power Supply Requirements
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:
Standard Models:
Blue display -- +400 +550 mA
All others -- +150 +225 mA
Low-Power Models:
Red display -- +12 +17 mA
Green or orange display -- +60 +100 mA
Display
DisplayType and Size 3½ Digit LED, 0.56"/14.2mm high
Polarity Indication Autopolarity ("–" for negative VIN)
Overrange Indication "–1___" for negative VIN
"1___" for positiveVIN
Physical/Environmental
Operating Temperature:
Blue display models 0 -- +50 °C
All other models 0 -- +60 °C
Storage Temperature –40 -- +75 °C
Humidity (Non-condensing) 0 -- 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)
A panel-mount retaining clip is supplied with each model.

3
3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS DMS-30PC
Applications
1. Single-Ended Input Configurations: True single-ended
measurements can be made with any DMS-30PC meter. The
circuit of Figure 2 avoids problems normally associated with
ground-loop currents. Separate ground runs should be used for
5V RETURN (pin 3) and (–) INPUT LO (pin 12).This will ensure
that large LED currents will not flow in the wiring that connects
VIN to (–) INPUT LO (pin 12). Ground-loop currents can cause
unstable readings.
Figure 2. Single-Ended Input Configuration
DMS-30PC meters are highly versatile devices that can be used in
hundreds of applications.The application circuits chosen for this
section have historically received many inquiries.Every attempt has
been made to ensure technical accuracy, and all of the following
circuits have been prototyped and tested to ensure functionality.
Please keep in mind, however, that real-world applications are
seldom as straightforward as the approaches presented here.Most
applications have many more components — and many more
connections — than the illustrations show.
The simplified schematic shown in Figure 1 can be very useful when
debugging a malfunctioning panel meter circuit, particularly if the
user has some knowledge of operational amplifiers (op amps).The
meter's high-impedance input consists of an op amp powered from a
±5Vdc power supply (the –5V is internally generated).Knowing this,
one can easily see why input signals applied to (–) INPUT LO and
(+) INPUT HI have to be kept within the power supply rails of ±5V.
Also note that only pin 11 has a current-limiting 909kΩseries
resistor.High input voltages that have a common ground with pin 3
(5V RETURN) should only be applied to pin 11 ((+) INPUT HI) and
never to pin 12.In these high-voltage cases, pin 12 should always
be tied to pin 3 (5V RETURN).
One of the simplified schematic's noteworthy features is that it
shows internal voltage values. It also shows that pin 3 is the meter's
zero-volt reference point — regardless of the type of power or signal
source used.This is an important point to keep in mind when a
digital or analog multimeter is used to make system measurements.
The multimeter's negative lead (usually the black one) must be
connected to pin 3 (5V RETURN).
4. DISPLAYTEST (Pin 2): Connecting pin 2 to +5V SUPPLY (pin
1) will activate all LED segments, except the decimal points, and
the display will read "1888" regardless of the actual applied input.
If a negative input is applied, DISPLAY TEST will also activate
the minus sign. To protect the LED's,the display should not
be left in the "test" mode for more than 10 seconds.
5. Decimal Point Placement:The location of the decimal point is
user-selectable, and the decimal point control pins (DP1-DP3)
are active low functions. Select the desired decimal point by
tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN).
Unused decimal point location pins should be left open.
Hard wiring is preferable, however, you can use logic gates to
exercise dynamic control over the location of the decimal point if
the following drive conditions are met:
Model Applied "0"Voltage Load Current*
DMS-30PC-X-RL +0.05Vmax. 0.7mA max.
DMS-30PC-X-BS +0.3Vmax. 18mA max.
All Others +0.4Vmax. 6mA max.
* The driving gates must be able to sink this much current
(IOL) with a logic "0" output.
6. Gain Adjust: There is a gain-adjust potentiometer on the back
of each meter. It has approximately ±50 counts (±2.5%) of
adjustment range. Since these devices essentially have no zero/
offset errors, a gain adjustment is effectively an overall accuracy
adjustment. Though they may be performed at any point (except
zero), accuracy adjustments are most effective when performed
with higher level input signals. The circuit shown in Figure 10
provides ±10% range of adjustment.
7. Soldering Methods: All models in the DMS-30PC Series easily
withstand most common wave soldering operations. We
recommend, however, that you evaluate the effects your
particular soldering techniques may have on the meter's plastic
case and high-precision electrical performance. We recommend
the use of water-soluble solders and thorough cleaning
procedures.
8. Suggested Mating Connectors:
Panel mounted:
Connector housing DATEL P/N 39-2079400
Terminal type DATEL P/N 39-2099090
Crimping tool DATEL P/N 39-2099000
Wire size 22 to 26 AWG
Insulation diameter 0.062" (1.57mm) maximum
Stripping length 0.100 to 0.125" (2.54 to 3.17mm)
Board mounted:
Socket DATEL P/N 39-2359625
1
12
3
+5V SUP
(–) IN LO
5V RET
DATEL
UPA-5/500
120 VAC
11
(+) IN HI
6
DP1
+
–
AC to DC Converter
V
IN
DMS-30PC-1
8
7
REF OUT
REF IN

4
DMS-30PC 3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS
Figure 3. Differential Input Configuration
R2
R1 + R2 xVIN = Reading
50kΩ< R1 + R2 < 10MΩ
Figure 6. Floating Input Measurements
(Alternate Configuration)
Figure 5. Floating Input Measurements
Figure 4. Input Attenuation Circuit
Connecting pin 10 (ANALOG COMMON) or pin 3 (5V RETURN)
to (–) INPUT LO (pin 12) provides the reference point for the
meter's input.
A "floating" input is a signal that has no galvanic connection to
the meter's power supply.In the figures below, the 1.5V battery
illustrates a true floating input.
RShunt = R1 =VFsr /IFsr
Where: VFsr = Full scale reading (inVolts)
IFsr = Relative full scale current (in Amps)
5. Process Control (4-to-20mA) Measurements: In many
common process-control applications, a 4-to-20mA current loop
is used to transmit information. Because DMS-30PC meters have
such high input impedance, a simple shunt resistor across the
meter's input can be used to convert the loop current to a voltage.
See Figure 7. The value of the shunt resistor is a function of the
scaling requirements of the particular application and can be
calculated using the following equation:
Applications
2. Differential Input Configurations: Differential measurements
can be made with all DMS-30PC meters. Figure 3, though not a
practical real-world application, uses a voltage divider to
demonstrate the concept of a differential input signal.Be careful
not to exceed the ±2V common mode voltage limitation for 5V-
poweredmeters.
3. Engineering Scaling: For measuring voltages greater than the
full scale input range of a given meter, the input signal must be
attenuated. A simple voltage divider (similar to that shown in
Figure 4) will scale the input to within the range of the selected
meter. R1 and R2 should be precision, ±1%, metal-film resistors
with absoluteTCR's less than 50ppm/°C.See Ap Note 4 for more
information on engineering scaling.
4. Floating Signal Source Measurements: Floating signals can
be measured using the circuits shown in Figures 5 and 6.
1
12
3
+5V SUP
(–) IN LO
5V RET
DATEL
UPA-5/500
120 VAC
11
(+) IN HI
6
AC to DC Converter
R2
R1
R3
1k
1k
1k
8
7
REF IN
DP1
REF OUT
DMS-30PC-1
R2
11
12
(+) IN HI
(–) IN LO
V
IN
R1
+
–
13
+5V SUP 5V RET
DATEL
UPA-5/500
120 VAC
AC to DC Converter
8
7
REF OUT
REF IN
DMS-30PC-1
13
+5V SUP 5V RET
DATEL
UPA-5/500
120 VAC
6
DP1
AC to DC Converter
DMS-30PC-1
12
(–) IN LO
11
(+) IN HI
1.5V
CELL
+
–
8
REF OUT
REF IN
12
7
13
5V RET 6 DP1
12
(–) IN LO
10
ANA COMM
11
(+) IN HI
1.5V
CELL
+
–
8
7
REF OUT
REF IN
DMS-30PC-1
+5V SUP
DATEL
UPA-5/500
120 VAC
AC to DC Converter

5
3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS DMS-30PC
Figure 10. External Gain AdjustmentFigure 8. 4.5-18V Power Supply Monitor
Figure 9. Basic DC Ammeter Circuit
Figure 7. 4-to-20mA Current Loop Operation
To calibrate the circuit of Figure 7, perform the following:
1. With 4mA applied, adjust the 50kΩpotentiometer (R2) to
display a reading of "000" (assuming that is the desired
reading).
2. With 20mA applied, adjust the gain-adjust potentiometer on
the back of the meter to display a reading of "1000". For
different full scale readings, alter the value of RShunt accordingly.
Example:For a meter with a 2V full scale input (1.999 full
scale reading) and a desired display reading of
"1000" (with an input of 20mA), VFsr = 1.000 Volts
RShunt = 1.000V/(0.020 – 0.004)A
RShunt = 1.000V/0.016A = 62.5 Ohms
6.Power Supply Monitoring: One of the most common digital
panel meter applications involves monitoring the output voltage of
the system power supply — often this supply also powers the
meter itself.The low-power, red LED DMS-30PC-2-RL can be
configured to allow power supply monitoring over the range of
4.5-18Vdc.The circuit in Figure 8 uses a low-drop-out, three-
terminal regulator (LM-2931Z-5, available from National
Semiconductor) to provide regulated 5V power to the meter.The
LM-2931 was chosen because it has the following on-chip
protection features:reverse polarity, short circuit and thermal run-
away.When using other, higher-power, DMS-30PC models with
three-terminal regulators, be sure to consult the regulator
manufacturer's data sheet to ensure the regulator is being
utilized safely and correctly.
7. Digital Ammeter: Digital ammeters are finding ever-increasing
usage because analog-style ammeters (moving-vane types) now
cost roughly the same as their digital counterparts.Additionally,
analog ammeters are not nearly as rugged as modern digital
panel voltmeters. Figure 9 illustrates a typical ammeter
application.The circuit uses a ±200mV input meter
— the preferred range for most ammeters — to measure the
voltage developed across a 0.1Ωcurrent shunt.The circuit
shown represents a basic ammeter connection diagram.A
detailed application note describing digital dc ammeters is
included in DATEL's new Digital Panel Meter Databook.
8. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the +1.23V REFERENCE OUT (pin 9) for
applications needing external gain adjustment. Figure 10 shows
the wiring configuration for each model. Calibration is performed
with a precise, near-full-scale, input voltage.
Applications
13
5V RET
DATEL
UPA-5/500
120 VAC
AC to DC Converter
DMS-30PC-1
12
(–) IN LO
10
ANA COMM
11
(+) IN HI
R1
+
–
4-20mA
50k
R2
8
7
REF OUT
REF IN
9
1.23V
REF 5V SUP
DMS-30PC-2-RL
5
712
+
–
11
1
4.5 - 18Vdc
LM2931Z-5
GND
IN OUT +5V SUP
3
5V RET
DP2
REF
IN
(+) IN HI
8
REF
OUT (–) IN LO
22µF
10V
+
DMS-30PC-0-YS
6
3
+
–
1
1.5 Amp (Load Current)
5Vdc
7
8
+5V SUP
5V RET
DP1
REF OUT
REF IN
11
0.150V
(+) IN HI
0.1
Ω
R
Shunt
Load
(3.3 )
12
(–) IN LO
Ω
9
(+) IN HI
(–) IN LO
ANA COMM
10 1.23V REF
1k
10 to 20 Turns
8REF IN
11
1k
10 to 20 Turns 8.45k, 1%
8.45k, 1%
5V RET
Connections
for ±2V, ±20V
and ±200V models
Connections
for ±200mV
models
7
NC
12
3
DMS-30PC
12
VOLTAGE
CALIBRATOR
OUT
COM

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com Email: [email protected]
Data sheet fax back: [phone]
DATEL (UK) LTD.Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights.The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith.Specifications are subject to change without notice.The DATEL logo is a registered DATEL, Inc. trademark.
®®
ISO 9001
ISO 9001
REGISTERED
DMS-30PC 3½ DIGIT, LED DISPLAY DIGITAL PANEL VOLTMETERS
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL
RECOMMENDED PC BOARD FINISHED HOLE DIAMETER:
0.042 ±0.003 (1.067 ±0.076)
Mechanical Specifications
DS-0258D 1/98
MADE IN USA
®®
BEZEL INSTALLATION
PANEL
BEZEL
® ®
RETAINING CLIP INSTALLATION
PANEL
#2-56 INSERT
0.156 (3.96) DEEP
FRONT VIEW
1.270
(32.26)
0.187
(4.75)
OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)
2.35 (59.69)
2.118 (53.80)
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18) 0.878
(22.30)
0.096
(2.44)
0.116
(2.95)
2.55 (64.77)
PANEL CUTOUT
MADE IN USA
DM S-30PC-X-XX
PIN #1
ID ENTIFIER
FRO N T VIEW
+5V SUPPLY
DISPLAY TEST
5V RETURN
DP3
DP2
DP1
1
2
3
4
5
6
12
11
10
9
8
7
( ) IN P U T L O
(+ ) IN P U T H I
ANALO G CO M M ON
+1.23V REFERENCE OUT
REFERENCE OUT
REFERENCE IN
DP1 DP2 DP3
2.17
(55.1)
2.09
(53.1)
1.80
(45.7)
0.25 (6.4)TY P .
0.15
(3 .7 )
TYP.
0.040
(1.02)
0.040
(1.02) 0.10
(2 .5 )
TYP.
0.50
(12.7)
0.17
(4 .3 )
TYP.
0.92
(23.4)
0.84
(21.3)
0.560
(14.22)
®®
0.040
(1.02)
0.250
(6.35)
0.260
(6.60)
PIN 1
CALIBRATION POTENTIOM ETER HOLE LOCATION
0.125 (3.175)D IAM E TE R
(USE ONLY W HEN PC BO ARD M O UNTING )