DMS-EB www.murata-ps.com Multi-Purpose Application Board for DMS-30 & DMS-40 Series Meters FEATURES Accommodates 3 and 4 digit meters Gain (span) and offset (zero) adjustments for PRODUCT OVERVIEW DMS-30 meters The DMS-EB Application Board covers many common panel meter applications while providing Input divider network for high voltages simple signal and power I/O terminations (via a standard MOLEX connector) for Murata Power Solutions Operate meter and board from +5V supply or DMS-30 and DMS-40 Series, LED/LCD Display, Digital Panel Voltmeters. The unique plug-and-play design 9/12V battery of the DMS-EB makes changing from application to application and meter to meter quick, easy and inexpensive. Solder gaps for decimal placement The highly versatile DMS-EB has provisions for such common applications as attenuation of high Same size as DMS-30/40 Series meters input voltages, gain (span) and offset (zero) adjustments, 9/12V battery operation, and direct decimal 2.02 (51.31mm)L x 0.83 (21.08mm)W point placement. The DMS-EB is compatible with all four versions of the DMS-30 and DMS-40 Series (200mV, 2V, 20V and 200V) making it interchangeable from meter to meter and application to application. Solder gaps conveniently placed on the board are easily bridged or cut con guring the board to meet each application s speci c requirements. This low-cost addition to Murata Power Solutions expanding line of miniature meters is evidence of our continuing commitment to offer the most versatile, easy-to-use, panel meter products. SIMPLIFIED SCHEMATIC d c c cc c d c c c d NOTES: c Components are user-supplied and not part of the standard product. d For DMS-40 meters only. Figure 1. DMS-EB Schematic Diagram for DMS-30 Meters For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMS-EB.C01 Page 1 of 4DMS-EB Multi-Purpose Application Board for DMS-30 & DMS-40 Series Meters Close SG6 when measuring oating inputs with a 9V-powered meter Ordering Information ( oating inputs are described in Technical Note 7). SG6 provides a bias reference for the input signal by tying LO to the meter s Analog Com- DMS-EB-C Application board with mating connector mon terminal (pin 10). and terminals DMS-BZL1-C DMS-30/40 bezel assembly 3. Input Resistor Dividers: Use 1%, or better, metal lm resistors for DMS-BZL2-C DMS-30/40 bezel assembly with R1 and R2 in DMS-30 applications, and 0.5%, or better, in DMS-40 sealing gasket applications. Using tight-tolerance resistors in input divider networks allows most nal calibration adjustments to be made with the meter s rear calibration pots through the access holes provided. Make sure Functional Speci cations the resistor power and voltage ratings are adequate for the given (TA = +25C) application. Input Supply Range See applicable meter s data sheet 4. Using U1 (LM7805CT): The power supply voltage range listed in the Input Supply Range U1 (LM7805CT) Installed: Battery Operation section is rated for a 150mA LED meter or a 35mA DMS-30/40PC-X-XS +7.5 to +12.6V backlit LCD meter. A 10F/35V tantalum capacitor (C2) should be DMS-30/40PC-X-XL +7.5 to +18.0V DMS-30/40LCD-X-5 +7.5 to +32.0V installed with the polarized end next to the + symbol on the DMS-EB. DMS-30/40LCD-X-5B +7.5 to +12.6V This is especially important if the power supply is located far from U1. Operating and Storage Temperature See applicable meter s data sheet 5. DMS-40 Meters: When the DMS-EB is used with DMS-40PC or DMS- Humidity 0 to 95%, non-condensing 40LCD meters, be sure to open SG13. The RN-DMS resistor acces- Dimensions 2.02 (51.31mm)L x 0.83 (21.08mm)W sory kit comprised of resistor R3 and potentiometers R4 (Gain/Span) J1 Connector & Wire Information and R5 (Offset/Zero), cannot be used with DMS-40 series meters. To Terminal Type MPS P/N 4400-01032-0 change the input range on DMS-40LCD meters from the low range to Crimp Tool MPS P/N 39-2099000 Wire Size 22 to 26 AWG the high range, close SG16. Insulation Diameter 0.062 (1.57mm) max. 6. Calibration Potentiometer Adjustment Holes: Two overlapping Stripping Length 0.100 to 0.125 (2.54 to 3.17mm) holes on the DMS-EB provide access to the -turn calibration poten- tiometer on DMS-30 meters and the 3-turn potentiometer on DMS-40 Introduction meters. The adjustment range of both pots is very narrow. See the applicable product data sheet for more information on each meters As shipped, the DMS-EB is con gured for 5V-powered DMS-30 3 calibration potentiometers. digit meters operating in the single-ended mode (SG5 closed) using the meter s internal reference (SG13 closed). This con guration is the most 7. Input Con gurations: The DMS-EB is supplied with SG5 closed. SG5 common and works well for most simple voltage measurements. connects J1, pin 2 (LO) to power return J1, pin 6 (GND) and con gures Many of the applications described below apply to both DMS-30 the meter for single-ended operation, that is, the low side of the input and DMS-40 meters. However, Application 5, installing the span (R4) and is at system ground or zero Volts. SG5 must also be closed when offset (R5) adjust potentiometers, can only be used with DMS-30 meters. measuring oating inputs. Floating inputs are signals which have no Also note that some of the other applications require the installation of electrical connection, or reference to, the power supply which powers R4 and R5. See Technical Note 5 when using the DMS-EB with DMS-40 the meter. meters. In applications in which input LO is connected to ground elsewhere in Please read all of the following technical notes and perform any the system, and SG5 is closed, unwanted ground-loop induced display required modi cations before soldering the DMS-EB onto the meter errors may develop. Ground loops, a condition in which display drive (aligning pin 1 to pin 1). After soldering, carefully connect +5Vdc to +V currents also ow through the input signal wiring, can cause unstable (J1, pin 5) and power return to V (J1, pin 6). display readings. If this occurs, try opening SG5 to see if the display stabilizes. TECHNICAL NOTES SG5 must be open when measuring differential inputs that are refer- 1. LCD Backlighting: For DMS-30LCD backlit models, close SG15. For enced to the same supply which powers the meter. DMS Application DMS-40LCD backlit models close SG18. See the DMS-30LCD or the Note 2 (Input Con gurations, Power Supplies and Ground Loops) DMS-40LCD data sheets for limitations on backlighting 9V-powered provides a detailed discussion of input con gurations. meters. 8. Soldering: Murata Power Solutions recommends the use ofno- 2. 9V-Powered, LCD Display Models: DMS-30LCD-X-9 and DMS- clea solders when installing or making modi cations to the DMS-EB. 40LCD-X/X-9 meters cannot be used in single-ended input con gura- tions, i.e., LO (J1, pin 2) cannot be connected to GND (J1, pin 6). When operating from a 7.5 to 14Vdc power source with a single-ended input, use a +5V-powered meter and install U1 (see Battery Operation section and Technical Note 4). www.murata-ps.com/support MPM DMS-EB.C01 Page 2 of 4