DATEL DMS-20PC-7-DCM Datasheet

www.datel.com

®®

DMS-20PC-7-DCM

–36 to –75Vdc, Self-Powered

Actual Size

Features

••

•

Great for –48Vdc telecom power monitoring

••

••

Self-powered 2-wire operation

•

••

••

•

–36 to –75V operating input range

••

••

•

Ultra-low power consumption, 8mA (typ.) at –48V

••

••

•

–200V input transient protection

••

••

•

Reverse polarity protected to +100V

••

••

•

0.37"/9.4mm high, bright red, LED display

••

••

•

Subminiature 1.38" x 0.88" x 1.0" package

••

••

•

Super reliable, epoxy-encapsulated construction

••

••

•

–25 to +60°C operating temperature rang e

••

Functional Specifications

Input

Voltage Range
Current Consumption 13.0mA (max.)
Reverse Polarity Protection +100V (max.)
Transient Protection –200V (1µsec duration)

Performance

Sampling Rate 2.5 readings/second
Resolution 0.1V
Accuracy @ +25°C ±0.1V (typ.), ±0.2V (max.)
Temperature Drift

(–25 to +60°C) ±0.2 counts/°C (max.)

Mechanical

Dimensions 1.38" x 0.88" x 1.00"
Display Type 3 digit, red LED, 0.37"/9.4mm
Weight 1 ounce (28 grams)
Case Material Polycarbonate

Environmental

Operating Temperature –25 to +60°C
Storage Temperature –40 to +75°C
Humidity (Non-condensing) 0 to 95%

➀

Operation and accuracy at inputs above or below this
range are not specified.

Ordering Information

DMS-20PC-7-DCM –36.0 to –75.0V dc voltage monitor
DMS-20-CP Panel cutout punch
DMS-BZL3 Panel mount bezel assembly
DMS-BZL4 Panel mount bezel with sealing gasket

Brass screws (6-32 thread) and a panel-mount retaining clip are
supplied with each meter

➀

–36.0 to –75.0Vdc

LED Display, DC Voltage Monitor

DATEL's new DMS-20PC-7-DCM self-powered digital voltage monitor is
designed for monitoring –48V intermediate bus voltages in modern telecom/
datacom/computer equipment. Its compact size and low power consumption
(8mA typical) make it the ideal replacement for older, hard-to-read, analog
panel meters. Simply connect a –36 to –75Vdc input across the two rear
terminals and the meter is fully operational!

The DMS-20PC-7-DCM's subminiature package
(1.38" x 0.88" x 1.0") houses a large, 0.37"/9.4mm,
bright red LED display which can be easily read from
15 feet away. Built-in reverse polarity and transient
protection assures simple, trouble-free installation.

The DMS-20PC-7-DCM employs a high­resolution, 3½ digit analog-to-digital converter and
precision metal-film resistors to achieve outstanding
performance over its entire operating temperature
range of –25 to +60°C. A rugged, epoxy­encapsulated, polycarbonate case
(available only from DATEL!) provides excellent
protection against moisture, shock and vibration.

Suggested wiring

(User supplied)

Mechanical Specifications

Dimensions in inches (millimeters)
Tolerances: 2 PL Dec ±0.02 (±0.51)

Recommended panel cutout dimensions:
Internal corner radii 0.032 (0.81) Max.

3 PL Dec ±0.010 (±0.254)

1.336 (33.93)W × 0.838 (21.29)H

#6-32

UNC THD

0.75

(19.1)

+

0.44

(11.2)

0.80

(20.3)

0.32
(8.1)

1.07

(27.2)

0.10
(2.5)

–

0.04

(1.016)

1.00

(25.4)

#2-56 INSERT

0.156 (3.96) DEEP

DMS-BZL3

Optional Bezel

1.63 (41.4)

1.83 (46.5)

0.88

(22.4)

0.19
(4.8)

0.04

(1.016)

0.04

(1.016)

1.28

(32.5)

0.10
(2.5)

0.37
(9.4)

–

Typical panel

mount installation

1.30

(33.0)

+

DMS-20PC-7-DCM

®®

1.38

(35.1)

DS-0389A 1/98

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • 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. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.