DMS-EB-RMS [ETC]
AC-to-RMS Converter Application Board for DMS-30PC/LCD Meters; 交流 - 真有效值转换器应用板的DMS - 30PC / LCD仪表
| 型号： | DMS-EB-RMS |
| 厂家： | 
ETC |
| 描述： | AC-to-RMS Converter Application Board for DMS-30PC/LCD Meters |
| 文件： | 总1页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
®
DMS -EB-RMS
AC-to-RMS Converter
Application Board for
Actual Size
DMS-30PC/LCD Meters
Purchase on-line at www.datel.com
Technical Notes
Features
Description:The DMS-EB-RMS board allows the true rms value of ac signals to be displayed
on 5V-powered DMS-30PC/LCD digital voltmeters.The meter/board combination has an input
range of 0-750Vac with ±2V meters (1Vac resolution) or 0-199.9Vac with ±200mV meters
(0.1Vac resolution).A built-in screw-terminal block reliably interfaces signal and power
connections.The DMS-EB-RMS now accommodates user-installed modifications such as
input-scaling resistors and isolated +5V dc/dc converters.
•
•
Displays true rms values of ac inputs
±0.5% accuracy for DMS-30PC-0
or DMS-30LCD-0-5
•
•
±2% accuracy for DMS-30PC-1
or DMS-30LCD-1-5
Also works with DMS-40PC/LCD meters
(see Ap Note 11)
Power and Safety Precautions:The DMS-EB-RMS’s AC HI and AC LOW inputs are not
electrically isolated from its 5V supply (AC LOW is connected directly to 5V RETURN).
When measuring any input signal which is derived from ac power mains, a dedicated (i.e.,
it only powers the DMS-EB-RMS), transformer-isolated +5V supply, with a minimum 1kV
breakdown rating, must be used to power the DMS-EB-RMS board/meter combination.
When measuring ac power mains inputs, never connect the DMS-EB-RMS’s 5V RETURN
to chassis/earth ground anywhere in the system. Failing to follow these instructions could
defeat any safety grounding and will place the system +5V power supply, and all its
associated circuitry, at dangerously elevated ac-line potentials.In many applications, the
DMS-EB-RMS installation is required to meet
Functional Specifications
(TA = +25°C, VCC = +5V)
Vac Measurement Range:
±200mV meters
±2V meters
0 to 199.9Vac
0 to 750Vac
Conversion Accuracy:
electrical code requirements.To ensure
P
S
J
1
R
3
J
6
0-200Vac
0-750Vac
±0.5%
±2%
R
R
2
1
J
J
2
3
1
2
1
safe operation, the DMS-EB-RMS board
should only be installed and serviced by
technically-qualified personnel. See DMS
Application Note 11 for more details.
U
1
2
1
1
1
0
J
P
1
U
3
J
5
J
4
Crest Factors
C
1
T
B
1
9
8
7
C
5
1
3, maximum
C
4
U
2
S
G
3
Input Frequency Range
1
2
3
4
5
6
C
2
S
G
4
40Hz to 2kHz
Primary Operating Power
C1 100µF
+
+5V (±5%)
5
4
5
4
CAV
OUT
–V
S
V
OUT
CAP–
GND
Current Consumption (Board only)
6
7
8
3
2
1
6
7
8
3
2
1
C5
2.2µF
(–) INPUT LO
12
11
+5V SUPPLY
1
2
CF
LV
+
U2
U1
+0.5mA typ., +1mA max.
+VS
VIN
OSC
V+
CAP+
COM
CC
(+) INPUT HI
BOOST
Operating Temperature Range
0 to +60°C
C4
2.2µF
10
9
J1
5V RETURN
DP3
3
4
+
+
SG1
SG2
SG3
Storage Temperature Range
C2
10µF
–20 to +75°C
SG4
5
6
DP2
DP1
REF. OUT
REF. IN
8
R1
988k
R2
988k
R3
1.98k
Humidity
0 to 95%, non-condensing
7
JP1
Dimensions
J4
J5
2.02" (51.31mm)W x 0.83" (21.08mm)H
U3
PS1
+VIN
DC/DC
–VOUT
1
V
IN
3
2
4
+V
VOUT
Ordering Information
GND
2
3
–V
1
DMS-EB-RMS
AC-to-RMS conversion
board
J6
TB1
DMS-BZL1
DMS-BZL2
Bezel assembly
Bezel assembly with
sealing gasket
1
3
AC LOW
5
+5V
6
Components are user-supplied
and not part of the standard product.
AC HI
5V Return
Figure 1. DMS-EB-RMS Schematic Diagram
DS-0398A 1/98
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
•
Email:sales@datel.com • 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.
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