Figure 1. DMS-EB-AC/DC Simplified Schematic Diagram

Features

®

®

DATEL, Inc., Mansfield, MA02048 (USA)

? Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 ??? Email:sales@datel.com ?? Internet: www.datel.com

100-264Vac Power Supply

Accessory Board for

DMS-30PC/LCD Panel Meters

DMS-EB-AC/DC

? Allows meters to operate from 100

to 240Vac (50/60Hz)

? Screw-type terminal block connections

? Provides 1500V isolation between AC

supply and input signal

? Has prototyping features of the standard

DMS-EB board

? On-board solder gaps for decimal

point placement

? Same size as DMS-30/40 meters

2.02" (51.3mm)L x 0.82" (20.8mm)W

? Low cost

This low-cost accessory board provides an easy way of powering all DMS-

30PC-X-RL (red low-power models only), as well as all DMS-30LCD and DMS-

40LCD (non-backlit, +5V-powered models only) panel meters from 100-264Vac

(50/60Hz). The on-board AC/DC converter provides an isolated +5Vdc to power the

meter’s electronics, while providing 1500Vac isolation between the AC supply and

the input signal being measured. Line power and input signals connect to two

rugged, screw-style terminal blocks (TB1 & TB2) permanently mounted on the

DMS-EB-AC/DC. This type of terminal block provides reliable mechanical connec-

tions and eliminates the need for any extra wiring harness connectors.

The DMS-EB-AC/DC board includes provisions for installing several user-

supplied components that are required when the meter must be scaled to display

non-standard input ranges. The DMS-EB-AC/DC has provisions for such common

applications as attenuation of high input voltages, gain (span) and offset (zero)

adjustments, and direct decimal point placement. The DMS-EB-AC/DC is compat-

ible with all four input versions of the DMS-30 Series meters (±200mV, ±2V, ±20V

and ±200V). Solder gaps, conveniently placed on the board, are easily bridged or

cut to configure the board to meet each application’s specific requirements.





Ž

Ž

Œ

Refer to Mechanical Layout drawing for components and

solder gap location.



Components are user-supplied and not part of the

standard product.

Ž

R4 and R5 are part of the resistor accessory kit RN-DMS

(see ordering information)



SG5 is not used

Order on-line at www.datel.com

R3

R5

10.5k

50k

R4

2k

SG7

SG11

R1

R2

SG10

SG14

SG6

SG9

SG8

SG4

SG12

SG3

SG2

SG1

(–) INPUT LO

(+) INPUT HI

ANALOG

COMMON

+1.23V

REF. OUT

REF. OUT/DP4

REF. IN

DC/DC

CONVERTER

+

12

11

8

7

10

9

3

4

5

6

2

1

TB2

1

2

1

2

Closed solder gap

Open solder gap

DP 3

DP 2

DP 1

5V

RETURN

+5V

SUPPLY

HI

(+)

LO

(–)

AC

LO

AC

HI

TB1

SG13

NEW DESIGN!

Wider Operating Range

1500V Isolation, Easier To Modify