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(R)
(R)
DMS-EB-RMS
Actual Size
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Features
* 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)
AC-to-RMS Converter Application Board for DMS-30PC/LCD Meters
Technical Notes
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. 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 electrical code requirements. To ensure PS1 J1 R3 J6 R2 J2 1 12 safe operation, the DMS-EB-RMS board 2 U1 11 JP 1 should only be installed and serviced by U3 10 R1 J5 J3 J4 technically-qualified personnel. See DMS C1 TB1 9 C5 1 Application Note 11 for more details. 8 C4
7
SG4
Functional Specifications
(TA = +25C, VCC = +5V)
Vac Measurement Range: 200mV meters 0 to 199.9Vac 2V meters 0 to 750Vac Conversion Accuracy: 0-200Vac 0.5% 0-750Vac 2% Crest Factors 3, maximum Input Frequency Range 40Hz to 2kHz Primary Operating Power +5V (5%)
U2
C2
1 2
3
4
5
6
SG3
C1 100F
+
5
Current Consumption (Board only) +0.5mA typ., +1mA max. Operating Temperature Range 0 to +60C Storage Temperature Range -20 to +75C Humidity 0 to 95%, non-condensing Dimensions 2.02" (51.31mm)W x 0.83" (21.08mm)H
CAV OUT
-VS
4 3 2 1
5 6 7 8
VOUT
CAP- GND
4 3 2 1 C5 2.2F
(-) INPUT LO 12
6 7
CF
LV
1 +5V SUPPLY
U1
+VS VIN
U2
OSC V+ CAP+ BOOST
+
(+) INPUT HI 11
8
COM
CC
2
10
J1
+
9
SG4 REF. OUT 8 R1 988k R2 988k C2 10F
C4 2.2F
3 5V RETURN
+
SG1
4 DP3
SG2
5 DP2
R3 1.98k SG3
REF. IN
7
6 DP1
JP1
J4
J5
U3Q 1 VIN 3 VOUT GND 2 1 -V 2 +V PS1Q +VIN DC/DC -VOUT 3 4
Ordering Information
DMS-EB-RMS DMS-BZL1 DMS-BZL2 AC-to-RMS conversion board Bezel assembly Bezel assembly with sealing gasket
TB1
J6
1 AC HI
3 AC LOW
5 +5V
6 5V Return
Q
Components are user-supplied and not part of the standard product.
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.
SG2 SG1

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