Datel DMS-20PC Series Manual

查询DMS-20PC供应商
www.datel.com
Features
• • • • • Lowest-cost LED meters
• • • • • Subminiature size:
1.38" x 0.88" x 0.48"
35mm x 22mm x 12mm
• • • • • Large (0.37"/9.4mm) LED display
• • • • • Choice of 5 LED colors
• • • • • High-intensity or low-power (7mA) red
LED's optional
• • • • • Epoxy-encapsulated, 12-pin DIP package
with built-in color filter and bezel
• • • • • 4 differential input voltage ranges
• • • • • Factory calibrated, ±1 count accuracy
• • • • • Single +5V power supply
• • • • • User-selectable decimal point placement
• • • • • DISPLAY ENABLE function for
"power-down" mode
• • • • • DISPLAY TEST and HOLD (optional)
functions
• • • • • 0 to +60°C temperature range
1
+5V SUPPLY
2
DISPLAY
ENABLE
3
5V RETURN
4
DP 3
5
DP 2
6
DP 1
1
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E-mail: sales@datel.com • Internet: www.datel.com
Actual Size
DMS-20PC Series, 3½ Digit, LED Display, Digital Panel Voltmeters combine a
precision A/D converter; a factory-trimmed, highly stable, voltage reference; and a
large (0.37"/9.4mm), easy-to-read LED display in a single package that is only
slightly larger than the display itself. Displays are offered in either red, orange,
amber, yellow or green colors. High-intensity and low-power (35mW total) red LED's
are also optional.
These low-cost meters are fully self-contained and fully functional. Their
subminiature (1.38" x 0.88" x 0.48"), epoxy-encapsulated cases incorporate built-in
color filters and bezels; are moisture and vibration proof; and function well in the
harshest environments. Their 12-pin, dual-in-line configuration offers component-like,
plug-in convenience and maximum versatility. Operating temperature range is 0 to
+60°C.
The meters come with one of four, differential, input voltage ranges: ±200mV, ±2V
±20V or ±200V. Input impedance is a minimum 800kΩ. CMRR is typically 86dB (dc
to 60Hz), and CMV is ±2V. Input overvoltage protection (on the non-inverting input)
is ±250V. Devices are fully calibrated at the factory to an accuracy of ±1 count
(±0.05% of full scale range) and never require calibration or adjustment.
A DISPLAY ENABLE function permits the display to be disabled for "power-
down" operation. All models have a DISPLAY TEST function. Standard red LED
models offer an optional DISPLAY HOLD function.
Small size, low cost and adjustment-free reliability make the DMS-20PC Series
the best choice for all your 3½ digit, LED, DPM applications.
+5V
–5V
DC/DC
CONVERTER
CONVERTER
0 Vdc
DATA
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.
Figure 1. DMS-20PC Series Simplified Schematic
DMS-20PC Series
V+
2
0.01
µF
V–
» +2.0V
A/D
+5V
Only used on ±200mV (-0) and ±2V (-1) models.
2
3 Pin 9 is DISPLAY TEST on all but eight models. On those models
(-H option), it is DISPLAY HOLD.
®
3½ Digit, LED Display
Low-Cost, Subminiature
Digital Panel Voltmeters
12
(–) INPUT LO
1
R2
R1 11 11
(+) INPUT HI
909k
10
ANALOG
COMMON
9
3
DISPLAY
TEST/HOLD
8
REFERENCE OUT
7
REFERENCE IN
®