DATEL, Inc., Mansfield, MA 02048 (USA)
• Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • Email: sales@datel.com • Internet: www.datel.com
Features
••••• Precision, autozeroing, factory-
calibrated A/D converter
••••• Scientific-grade accuracy, ±2 counts
••••• Miniature size:
2.17" x 0.92" x 0.56"
55mm x 23mm x 14mm
••••• Large (0.52"/13.2mm) LED display
••••• Choice of red, green or yellow colors
••••• High-intensity or low-power red
LED's optional
••••• Single +5V supply (175mW for low-
power models)
••••• Epoxy-encapsulated, 12-pin DIP with
built-in color filter and bezel
••••• 3 differential input voltage ranges
••••• DISPLAY HOLD and TEST functions
••••• Optional BCD data outputs for CPU
interface
••••• 0 to +50°C temperature range
4½ Digit, LED Display
Precision, Miniature
Digital Panel Voltmeters
DMS-40PC Series, 4½ Digit, LED Display, Miniature DPM's are fully self-contained,
component-like, plug-in meters that provide scientific-grade accuracy (typically ±2
counts or ±0.005% of full scale) and outstanding reliability at a very affordable price.
Within its miniature (2.17" x 0.92" x 0.56"), epoxy-encapsulated package, each
meter contains a precision reference circuit; a high-resolution, autozeroing, factory-
calibrated A/D converter; and a large (0.52"/13.2mm), easy-to-read, LED display.
LED's are available in red, yellow and green colors. Red LED's are also offered in
high-intensity or low-power versions.
The versatile design of the DMS-40PC Series assures trouble-free installation and
long-term operation. Differential input voltage ranges include ±2V, ±20V and ±200V.
Input impedance is a minimum 800k
Ω. Non-inverting inputs are overvoltage protected
to ±250V, and CMRR is typically 86dB (dc to 60Hz).
The DMS-40PC's epoxy-encapsulated package has an integral bezel and color
filter. The moisture and vibration-proof package is extremely rugged and well suited for
harsh environments and extended temperatures. Devices are fully specified for
0 to +50°C operation.
All models operate from a single +5V supply and typically consume 500mW. Low-
power models, whose display is just as bright as standard models, typically consume
175mW. DISPLAY TEST and HOLD functions are standard on each meter, and a
complete set of BCD outputs are optional for sending data to CPU's or remote
displays.
Figure 1. DMS-40PC Series Simplified Schematic
DMS-40PC Series
Actual Size
(+) INPUT HI
(–) INPUT LO
ANALOG
COMMON
DP4
REFERENCE IN/OUT
+5V SUPPLY
R1
DP 1
DP 2
DP 3
6
5
4
9
11
12
10
8
7
1
3
DC/DC
CONVERTER
2
5V RETURN
+5V
–5V
+5V
2.5V
REF.
R2
DATA
V+
V–
A/D
CONVERTER
0 Vdc
0.01µF
DISPLAY HOLD
DISPLAY TEST
R2 is not used on ±2V (-1) models.
R2 = 101k on ±20V (-2) models and 9.2k on ±200V (-3) models.
909k
1
1
®®
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