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DMS-30PC-0-GL Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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DMS-30PC-0-GL Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 6 page 3 3 ½ DIGIT , LED DISPLA Y DIGIT AL P ANEL V O L TMETERS DMS-30PC Applications 1. Single-Ended Input Configurations: True single-ended measurements can be made with any DMS-30PC meter. The circuit of Figure 2 avoids problems normally associated with ground-loop currents. Separate ground runs should be used for 5V RETURN (pin 3) and (–) INPUT LO (pin 12). This will ensure that large LED currents will not flow in the wiring that connects VIN to (–) INPUT LO (pin 12). Ground-loop currents can cause unstable readings. Figure 2. Single-Ended Input Configuration DMS-30PC meters are highly versatile devices that can be used in hundreds of applications. The application circuits chosen for this section have historically received many inquiries. Every attempt has been made to ensure technical accuracy, and all of the following circuits have been prototyped and tested to ensure functionality. Please keep in mind, however, that real-world applications are seldom as straightforward as the approaches presented here. Most applications have many more components — and many more connections — than the illustrations show. The simplified schematic shown in Figure 1 can be very useful when debugging a malfunctioning panel meter circuit, particularly if the user has some knowledge of operational amplifiers (op amps). The meter's high-impedance input consists of an op amp powered from a ±5Vdc power supply (the –5V is internally generated). Knowing this, one can easily see why input signals applied to (–) INPUT LO and (+) INPUT HI have to be kept within the power supply rails of ±5V. Also note that only pin 11 has a current-limiting 909k Ω series resistor. High input voltages that have a common ground with pin 3 (5V RETURN) should only be applied to pin 11 ((+) INPUT HI) and never to pin 12. In these high-voltage cases, pin 12 should always be tied to pin 3 (5V RETURN). One of the simplified schematic's noteworthy features is that it shows internal voltage values. It also shows that pin 3 is the meter's zero-volt reference point — regardless of the type of power or signal source used. This is an important point to keep in mind when a digital or analog multimeter is used to make system measurements. The multimeter's negative lead (usually the black one) must be connected to pin 3 (5V RETURN). 4. DISPLAY TEST (Pin 2): Connecting pin 2 to +5V SUPPLY (pin 1) will activate all LED segments, except the decimal points, and the display will read "1888" regardless of the actual applied input. If a negative input is applied, DISPLAY TEST will also activate the minus sign. To protect the LED's, the display should not be left in the "test" mode for more than 10 seconds. 5. Decimal Point Placement: The location of the decimal point is user-selectable, and the decimal point control pins (DP1-DP3) are active low functions. Select the desired decimal point by tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal point location pins should be left open. Hard wiring is preferable, however, you can use logic gates to exercise dynamic control over the location of the decimal point if the following drive conditions are met: Model Applied "0" Voltage Load Current* DMS-30PC-X-RL +0.05V max. 0.7mA max. DMS-30PC-X-BS +0.3V max. 18mA max. All Others +0.4V max. 6mA max. * The driving gates must be able to sink this much current (IOL) with a logic "0" output. 6. Gain Adjust: There is a gain-adjust potentiometer on the back of each meter. It has approximately ±50 counts (±2.5%) of adjustment range. Since these devices essentially have no zero/ offset errors, a gain adjustment is effectively an overall accuracy adjustment. Though they may be performed at any point (except zero), accuracy adjustments are most effective when performed with higher level input signals. The circuit shown in Figure 10 provides ±10% range of adjustment. 7. Soldering Methods: All models in the DMS-30PC Series easily withstand most common wave soldering operations. We recommend, however, that you evaluate the effects your particular soldering techniques may have on the meter's plastic case and high-precision electrical performance. We recommend the use of water-soluble solders and thorough cleaning procedures. 8. Suggested Mating Connectors: Panel mounted: Connector housing DATEL P/N 39-2079400 Terminal type DATEL P/N 39-2099090 Crimping tool DATEL P/N 39-2099000 Wire size 22 to 26 AWG Insulation diameter 0.062" (1.57mm) maximum Stripping length 0.100 to 0.125" (2.54 to 3.17mm) Board mounted: Socket DATEL P/N 39-2359625 1 12 3 +5V SUP (–) IN LO 5V RET DATEL UPA-5/500 120 VAC 11 (+) IN HI 6 DP1 + – AC to DC Converter VIN DMS-30PC-1 8 7 REF OUT REF IN |
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Similar Description - DMS-30PC-0-GL |
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