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0 to +50擄C temperature range
DMS-40PC Series, 4錕?frac12; Digit, LED Display, Miniature DPM's are fully self-contained,
component-like, plug-in meters that provide scientific-grade accuracy (typically 鹵2
counts or 鹵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 鹵2V, 鹵20V and 鹵200V.
Input impedance is a minimum 800k鈩? Non-inverting inputs are overvoltage protected
to 鹵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擄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.
+5V
1
+5V SUPPLY
鈥?V
2
DISPLAY TEST
DC/DC
CONVERTER
V鈥?/div>
V+
R2
1
12
(鈥? INPUT LO
0.01碌F
R1
909k
11
(+) INPUT HI
10 ANALOG
COMMON
3
5V RETURN
0 Vdc
A/D
CONVERTER
2.5V
REF.
4
DP 3
DATA
9
5
DP 2
8
DP4
6
DP 1
+5V
7
REFERENCE IN/OUT
1
DISPLAY HOLD
R2 is not used on 鹵2V (-1) models.
R2 = 101k on 鹵20V (-2) models and 9.2k on 鹵200V (-3) models.
Figure 1. DMS-40PC Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
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Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
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Email: sales@datel.com
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Internet: www.datel.com
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