DMS-20PC-1-LM-C - MURATA MANUFACTURING

Murata Power Solutions’ DMS-20PC-1-LM is a component-size, self-contained, low-cost

ac voltmeter for true line measurements. It requires no additional components or auxiliary

power. Simply plug it into any wall outlet and instantly read voltages from 85 to 264Vac

(47-63Hz). The large (0.37"/9.4mm), bright red, blue or green LED display makes the

DMS-20PC-1-LM easily readable under any lighting conditions.

DMS-20PC-1-LM employs half-wave

sinusoidal averaging (rms calibrated) and has

a display resolution of 1Vac over its full input

range. Packaged in a red-ﬁ lter case with built-

in bezel, the meter is fully encapsulated for

ruggedness. All units are overvoltage protected

to 300Vac.

This low-cost meter is ideal for industrial,

laboratory, ofﬁ ce and ﬁ eld-service applica-

tions. Its miniature size is perfect for design

into high-end consumer electronics, laboratory

instrumentation and other products requiring

accurate ac line monitoring.

C®US E156931

8C48

➀ Operation and accuracy at inputs above or below these ranges are not speciﬁ ed.

DMS-20PC-1-LM-C Red LED with threaded standoffs ➁

DMS-20PC-1-LM-B-C Blue LED with threaded standoffs ➁

DMS-20PC-1-LM-G-C Green LED with threaded standoffs ➁

DMS-20PC-1-LM-F-C Red LED with blade terminals

DMS-20PC-1-LM-BF-C Blue LED with blade terminals

DMS-20PC-1-LM-GF-C Green LED with blade terminals

DMS-20-CP Optional panel cutout punch

DMS-BZL3-C Optional panel mount bezel

DMS-BZL4-C Optional panel mount bezel with sealing gasket

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

Ordering Information

Functional Speciﬁ cations

Input

Voltage Range ➀ 85-264Vrms

UL/IEC61010-1 Measurement Category II

Frequency Range ➀ 47-63Hz

Current Consumption 50mArms (max.)

Performance

Sampling Rate 2.5 readings/second

Measurement Type Half-wave average, rms

calibrated for sinusoidal input

Accuracy @ +25°C ±1V (typ.), ±2V (max.)

Temperature Drift

(–25 to +60°C) ±0.15 Volts/°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

6-32 screw torque 6-8 in-lb (0.7 – 0.9N-m)

Environmental

Operating Temperature –25 to +60°C

Storage Temperature –40 to +75°C

Humidity (Non-condensing) 0 to 95%

CURRENT

LIMITED

AC SUPPLY

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

DMS-20PC-1-LM

Self-Powered 3 Digit, LED Display

AC Line Voltage Monitors

MPM_DMS-20PC-1-LM.D01 Page 1 of 2

FEATURES

 Plugs directly into USA-style wall outlets

 Screw terminals for panel mounting

 Small 1.38" x 0.88" x 1.0" packages

 Large, easy-to-read, red, blue or green LED displays

 Fully encapsulated for harsh environments

 Half-wave averaging, rms calibrated

 UL, CSA and IEC1010-1 certiﬁ ed

 Very low cost!

DMS-20PC-1-LM-F

(Blade Terminals)

DMS-20PC-1-LM

(Panel Mount)

Suggested wiring (user supplied)

Typical Connection Diagram

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.

DMS-20PC-1-LM

0.75

(19.1)

#6-32

UNC THD

0.44

(11.2) 0.80

(20.3)

0.32

(8.1)

0.04

(1.016)

0.88

(22.4)

1.00

(25.4)

0.04

(1.016)

0.04

(1.016)

1.30

(33.0)

1.38

(35.1)

0.19

(4.8)

1.28

(32.5)

0.10

(2.5)

1.07

(27.2)

0.10

(2.5)

#2-56 INSERT

0.156 (3.96) DEEP

1.63 (41.4)

1.83 (46.5)

0.37

(9.4)

DMS-BZL3-C

Optional Bezel

Power Supply Polarity, Grounding, Fusing, and Wiring

1. Polarity and Grounding:

DMS-20PC-1-LM’s two ac-supply input terminals are not polarity sensitive,

that is, they have no “AC LO” or “AC HI” designations. These units do not

include nor require a connection to earth/chassis ground. All ac-supply wiring

must be rated for the voltages and currents they will conduct and comply

with any code or application-mandated requirements pertaining to the user’s

speciﬁ c installation. Additional model-speciﬁ c information is provided below.

2. UL Recognized Panel Mount Models with Screw Terminals:

DMS-20PC-1-LM AC voltmeters are not internally fused. The supply wires

feeding these voltmeters must be fused with a 0.25A/250V time delay/time lag

fuse, in accordance with applicable regulatory codes. The rear threaded stand-

off input-terminals are to be used only for powering the voltmeter’s internal

circuitry; they must not be used to supply power to external loads.

The recommended wire size is 16AWG to 20AWG (1.31mm2 to 0.52mm2)

stranded copper wire. Wires must be properly stripped and attached to the

threaded standoffs such that their insulation is not pinched by the supplied

6-32 screws. Rated tightening torque for the 6-32 screws is 7 to 8 pound-

inches (0.8 to 0.9N-m). 300V UL rated wire suitable for the intended applica-

tion is required.

3. UL Listed Models with “Plug-in” Blade Terminals:

Plug-in DMS-20PC-1-LM-XF models are not internally fused and must be

protected by an external current limiting circuit breaker or fuse in accordance

with applicable regulatory codes. These models are designed to be plugged

into NEMA 1-15R, NEMA 5-15R, and NEMA 5-20R receptacles.

4. Description of the safety marks:

Caution, risk of electrical shock

Caution, risk of danger

Equipment is protected throughout by double or reinforced insulation

5. Cleaning Instructions: Gently clean with dry cloth only.

6. Caution: if the equipment is used in a manner not speciﬁ ed by Murata

Power Solutions, the protection provided by the equipment may be

impaired.

US E156931

www.murata-ps.com/support

Murata Power Solutions, Inc. 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

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/

DMS-20PC-1-LM

Self-Powered 3 Digit, LED Display

AC Line Voltage Monitors

MPM_DMS-20PC-1-LM.D01 Page 2 of 2