Example

Using a DMS-30-1 meter (+/-2V range), Vin is 0-5Vdc and the display

reading must be “000” to “1500”

1. Assume R1 = 1.0MΩ.

2. R2 = (FSI x R1) / ( |Vin| - FSI)

R2 = (1.500 x 1,000,000) / (5.0 - 1.500)

R2 = 428,571Ω or 432kΩ

3. Calibrate the meter using a known voltage source. Adjust R4 to

compensate for tolerances in R1 and R2.

4. DC Current Measurements (Use +/-200mV Range DMS-30-0

Meters):

When using R2 location for a dc current-shunt, please note that the

pc-board copper traces which short out R1 can only carry currents

up to 0.2A (200mA). However, dc currents up to 2A can be accommo-

dated if a 20AWG jumper wire is soldered in location R1. Be sure R2

has a sufficient power rating to safely carry the full load current. Refer

to DMS Application Note 6 for more information on dc ammeters.

meter reading (0 up to 1999, disregarding any decimal points), and

2. Configure the DMS-EB for span adjust using the procedure previ-

ously outlined for the DMS-30-0 (+/-200mV range).

3. Apply the input signal (current) to TB1 (+) HI and (–) LO.

4. Adjust R4 for desired full scale readings.

5. Enable the appropriate decimal point using SG1, SG2, or SG3.

Example

Using a DMS-30-0 meter, a 0.100 Ampere input must read “100.0”

mA on the display.

R2 = 1000 / (0.1 x 10000)

R2 = 1 Ohm

Enable DP3 via SG3 for a display reading of “100.0.”

APPLICATIONS

12

R3

SG9

SG11

SG6

SG10

SG14

SG7

SG8

SG13

SG4

SG12

TB1

HI(+)

LO(–)

12

DP4

R5

R4

12

R3

SG9

SG11

SG6

SG14

SG7

SG8

SG13

SG4

SG12

TB1

HI(+)

LO(–)

12

DP4

R1

R2

Figure 3. R4 and R5 Installation

Figure 4. R1 and R2 Installation

DMS-EB-AC/DC

100-264Vac Power Supply

Accessory Board for DMS-30PC/LCD Panel Meters

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. Specifications are subject to change without

notice.

© 2008 Murata Power Solutions, Inc.

USA:

Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com

Canada:

Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com

UK:

Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com

France:

Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com

Germany:

München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com

Japan:

Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com

Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com

China:

Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com

Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com

Singapore:

Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com

Murata Power Solutions, Inc.

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

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED

www.murata-ps.com

12/30/08

MPM_DMS-EB-AC/DC.B01 Page 4 of 4