2
DMS-40PC
4 ½ DIGIT , LED DISPLA Y DIGIT A L P ANEL VOL TMETERS
Performance/Functional Specifications
Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit,
unless otherwise noted.
➀ Applies 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.
➁ See Technical Notes.
➂ BCD outputs are optional and must be specified in the part number.
See Ordering Information.
➃ Includes high-intensity and BCD-output models.
Accessories:
DMS-PS1-CM
+5V/1.0A AC/DC power supply module
DMS-30-CP
Panel cutout punch
DMS-BZL1
DMS-40 bezel assembly
DMS-BZL2
DMS-40 bezel assembly with sealing gasket
DMS-EB
Application/evaluation board with standard
MOLEX connector, decimal point solder pads
and attenuation resistor pads.
BCD Output Models:
BCD outputs are only available on standard red meters.
DMS-40PC-1-RS-BCD for ±2V input range
DMS-40PC-2-RS-BCD for ±20V input range
DMS-40PC-3-RS-BCD for ±200V input range
DMS-40PC-1-RL-BCD for ±2V input range
DMS-40PC-2-RL-BCD for ±20V input range
DMS-40PC-3-RL-BCD for ±200V input range
DMS-40PC - 1 - R S
Technical Notes
1. ANALOG COMMON (Pin 10): This pin is an internal, low-noise
ground for the DMS-40PC. It is internally connected to pin 3
(5V RETURN). Do not connect pin 10 to either pin 3 or your
system ground as this will create a ground loop and possibly result
in erroneous readings.
2. REFERENCE INPUT/OUTPUT (Pin 7): This pin accesses the
meter's internal reference and is used during the factory calibration
procedure. Pin 7 should be left open in most common applications.
It can be used in certain "ratiometric" applications in which it is
desirable for the meter’s reference to track an external reference.
See Ap Note 3 in the DATEL Panel Meter Catalog for more details.
3. DISPLAY TEST (Pin 2): Connecting pin 2 to ground (pin 3, 5V
RETURN) will activate all LED segments, and the display will read
"–18888" regardless of the actual applied input. To reduce self-
heating, the display should not be left in the "test" mode for
more than 10 seconds. This pin should be left open if unused.
4. DISPLAY HOLD (Pin 9): For normal operation, this pin should be
left open. To hold the meter’s last reading and display it continu-
ously, tie pin 9 to ground (pin 3, 5V RETURN).
5. Decimal Point Placement: The location of the decimal point is
user-selectable, and the decimal point control pins (DP1-DP4) are
active low functions. Select the appropriate decimal point by tying
pin 4, 5, 6 or 8 to pin 3 (5V RETURN). Unused decimal point
location pins should be left open.
Ordering Information
LED Color:
GS = Standard Green
RH = High-Intensity Red
RL = Low-Power Red
RS = Standard Red
YS = Standard Yellow
Input Range:
1 = ±2V
2 = ±20V
3 = ±200V
A panel-mount retaining clip is supplied with each model.
Analog Inputs
Min.
Typ.
Max.
Units
Full Scale Input Range:
DMS-40PC-1
--
±2
--
Volts
DMS-40PC-2
--
±20
--
Volts
DMS-40PC-3
--
±200
--
Volts
Input Impedance:
DMS-40PC-1
100
1000
--
M
Ω
DMS-40PC-2, -3
0.8
1
--
M
Ω
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, 8)
Tie to pin 3 to activate
Display Test (Pin 2)
Tie to pin 3 to activate all segments
Display Hold (Pin 9)
Tie to pin 3 to hold last reading
BCD Outputs ➂
Logic levels (1 LSTTL load max.):
Logic "1"
+2.4
--
--
Volts
Logic "0"
--
+0.4
+0.8
Volts
Performance
Sampling Rate
2.5 samples per second
Accuracy (15 minute warm-up):
DMS-40PC-1 (VIN = +1.9V)
--
±2
±3
Counts
DMS-40PC-2 (VIN = +19V)
--
±3
±4
Counts
DMS-40PC-3 (VIN = +190V)
--
±3
±4
Counts
Zero Reading (VIN = 0 Volts)
"– 0001"
"0000"
"0001"
Temperature Drift (0 to +50°C):
DMS-40PC-1
--
±0.4
±1
Cnts/°C
DMS-40PC-2, -3
--
±0.4
±1.5
Cnts/°C
Power Supply Requirements
Supply Voltage
+4.75
+5.00
+5.25
Volts
Supply Current:
Standard Models ➃
--
+100
+140
mA
Low-Power Models
--
+35
+50
mA
Display
Display Type and Size
4½ Digit LED, 0.52"/13.2mm high
Polarity Indication
Autopolarity ("–" for negative VIN)
Overrange Indication
"– 0000" (flashing) for negative VIN
"0000" (flashing) for positive VIN
Physical/Environmental
Operating Temperature
0
--
+50
°C
Storage Temperature
–20
--
+75
°C
Humidity (Non-condensing)
0
--
95
%
Case Material
Polycarbonate
Weight
0.75 ounces (21 grams)
Order on-line at www.datel.com
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