Figure 1. DMS-EB-AC/DC Simplified Schematic Diagram
Features
®
®
DATEL, Inc.
, Mansfield, MA 02048 (USA)
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Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
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Email: [email protected]
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Internet: www.datel.com
100-264Vac Power Supply
Accessory Board for
DMS-30PC/LCD Panel Meters
DMS-EB-AC/DC
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Allows meters to operate from 100
to 240Vac (50/60Hz)
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Screw-type terminal block connections
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Provides 1500V isolation between AC
supply and input signal
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Has prototyping features of the standard
DMS-EB board
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On-board solder gaps for decimal
point placement
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Same size as DMS-30/40 meters
2.02" (51.3mm)L x 0.82" (20.8mm)W
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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 is5Vdc 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.
➁
➁
➂
➂
➀
Refer to Mechanical Layout drawing for components and
solder gap location.
➁
Components are user-supplied and not part of the
standard product.
➂
R4 and R5 are part of the resistor accessory kit RN-DMS
(see ordering information)
➃
SG5 is not used
Order on-line at www.datel.com
R3
R 5
10.5k
50k
R4
2k
SG7
SG11
R 1
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
+V
OUT
+V
I N
–V
IN
–V
OUT
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
