DATEL, Inc., Mansfi eld, MA 02048 (USA)
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
Email: sales@datel.com
Internet: www.datel.com
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. Specifi cations are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
DMS-20PC-FM
Self-Powered, 3-Digit, LED
AC Line Frequency Monitors
Features
DS-0387D 02/01
Actual Size
DATEL's new DMS-20PC-FM Series are the world's smallest, self-pow-
ered, ac frequency meters. Simply connect the ac line to the two rear input
terminals, and the unit is fully operational with no additional components or
auxiliary power required! Two, 50/60Hz models operate over input voltage
ranges of 85-140Vac or 170-264Vac. A third, 400Hz model operates over an
input voltage range of 85-140Vac. Despite their small size (1.38" x 0.88" x
1.0"), DMS-20PC-FM meters feature large 0.40"/10.2mm red LED's that can
be easily read from 15 feet away.
An ultra-stable, quartz-crystal-con-
trolled, embedded microcomputer pro-
vides accuracies of 0.1Hz (50/60Hz
models) or 1.0Hz (400Hz model) over
the entire operating temperature range
of 25 to +60C. Epoxy encapsulated
plastic packages provide excellent
protection against the harsh environ-
ments normally encountered by emer-
gency backup power generators. DMS-
20PC-FM meters are the exact same
size as DATEL's popular AC Line Voltage
Monitors (models DMS-20PC-X-LM).
Self-powered, no external supplies required
3 models: 47.0-99.0Hz (85-140Vac)
47.0-99.0Hz (170-264Vac)
350-450Hz (85-140Vac)
Screw terminals simplify panel mounting
Ideal for emergency power equipment
Small 1.38" x 0.88" x 1.0" packages
Epoxy encapsulated for harsh environments
Large (0.40"/10.2mm) red LED displays
Ordering Information
DMS-20PC-1-FM 47.0-99.0Hz/120Vac frequency monitor
DMS-20PC-1-FM-F "-1" models with blade terminals
DMS-20PC-2-FM 350-450Hz/120Vac frequency monitor
DMS-20PC-3-FM 47.0-99.0Hz/220Vac frequency monitor
DMS-20-CP Panel cutout punch
DMS-BZL3 Panel mount bezel
DMS-BZL4 Panel mount bezel with sealing gasket
Mechanical Specifi cations
Dimensions in inches (millimeters)
Tolerances: 2 PL Dec 0.02 (0.51)
3 PL Dec 0.010 (0.254)
Recommended panel cutout dimensions:
1.336 (33.93)W 0.838 (21.29)H
Internal corner radii 0.032 (0.81) Max.
Input
Freq. Range (Voltage Range):
DMS-20PC-1-FM 47.0-99.0Hz (85-140Vac)
DMS-20PC-2-FM 350-450Hz (85-140Vac)
DMS-20PC-3-FM 47.0-99.0Hz (170-264Vac)
Current Consumption 50mArms (max.)
Overvoltage Protection:
DMS-20PC-1/2-FM 200Vrms (max.)
DMS-20PC-3-FM 300Vrms (max.)
Performance
Sampling Rate 4 readings/second
Accuracy (25 to +60C):
DMS-20PC-1/3-FM 0.1Hz
DMS-20PC-2-FM 1.0Hz
Mechanical
Dimensions 1.38" x 0.88" x 1.00"
Display Type 3 digit, red LED, 0.4"/10.2mm
Weight 1 ounce (28 grams)
Case Material Polycarbonate
Environmental
Operating Temperature 25 to +60C
Storage Temperature 40 to +75C
Humidity (Non-condensing) 0 to 95%
Operation and accuracy at inputs above or below these
ranges are not specifi ed.
Functional Specifi cations
Brass screws (6-32 thread) and a panel-mount retaining clip are
supplied with each meter
DMS-20PC-1-FM-F
(With blade terminals)
DMS-20PC-1-FM
(Panel mount)
0.10
(2.5)
0.75
(19.1)
0.44
(11.2)
0.80
(20.3)
0.04
(1.016)
0.32
(8.1)
1.00
(25.4)
0.44
(10.2)
0.88
(20.4)
1.38
(35.1)
0.04
(1.016)
1.30
(33.0)
0.44
(10.2)
1.63 (41.1)
1.83 (46.5)
0.44
(10.2)
1.07
(27.2)
0.10
(2.5)
#6-32
UNC THD
#2-56 INSERT
0.156 (3.96 DEEP
E156931
Order online at www.datel.com
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