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DSD-40PC-1-RS-C Datasheet(PDF) 4 Page - Murata Power Solutions Inc. |
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DSD-40PC-1-RS-C Datasheet(HTML) 4 Page - Murata Power Solutions Inc. |
4 / 6 page When using other, higher-power, DMS-40PC models in combina- tion with three-terminal regulators, be sure to consult the regulator manufacturer’s data sheet to ensure the device is being utilized safely and correctly. Figure 4. 4.5-18V Power Supply Monitor 4. Floating Signal Source Measurements: A floating input is a signal that, before it is applied to the DMS-40PC’s inputs, has no galvanic connection (direct current path) to the meter or the meter’s power supply. The circuit shown in Figure 5 illustrates the necessary con- nections for measuring floating inputs. The 1.5V battery represents a true floating input signal since it initially has no connection whatso- ever in common with the meter. Real-world floating inputs typically originate from power supplies which are transformer isolated from the DMS-40PC’s +5V supply. The connection of pin 12 ((–) INPUT LO) to pin 10 (ANALOG COMMON) is required in order to provide a bias return for the meter’s input amplifier. This is because neither pin 11 nor pin 12 are tied to any reference voltage inside the DMS-40PC (see Figure 1). These connec- tions are not made internally in order to give the meter the abil ity to make differential measurements as described in a previous section. Figure 5. Floating Input Measurements 3. Power Supply Monitoring: One of the most widely used digital panel voltmeter applications is monitoring the output voltage of a system power supply — often the same supply that also powers the meter. The low-power, red LED DMS-40PC-2-RL, with its excellent 0.001Vdc resolution, can be configured to monitor power supplies with outputs in the range of 4.5-18Vdc. The circuit in Figure 4 uses a low-drop- out, three-terminal regulator (LM-2931T-5, in a T0-220 package, available from National Semiconductor) to provide regulated 5V power to the meter. The LM-2931 was chosen because it has the following on-chip pro- tection features: reverse polarity, short circuit and thermal runaway. The DMS-40PC-3-RL can monitor voltages up to ±200Vdc, provided a separate +5V power source is used since many three-terminal regulators cannot operate with supply voltages greater than 24V. Red, low-power LED models, with their very low self-heating, are recom- mended for applications in which low calibration drift is desirable. Figure 3. Differential Input Configuration 2. Differential Input Configurations: Differential inputs can also be measured with DMS-40PC meters as shown in the circuit of Figure 3. Differential inputs must also originate from power supplies that have a common ground with the meter’s 5V RETURN (pin 3). However, differential inputs usually have both terminals above and/or below 5V RETURN. Figure 3, though not necessarily a typical real-world application, does serve the purpose of illustrating the concept of a differential signal. The voltages developed across R1, R2 and R3 are equal to each other and measure approximately +1.6666Vdc or 1/3 of the +5V power source. More importantly, while the signal across R3 is single-ended, both ends of R1 and R2 are well above ground and are described here as being differential. Please note that while the DMS-40PC can measure the voltages across either R2 or R3, it cannot measure the +1.6666 volts across R1! The voltage at the lower end of R1 is approximately 3.333V and this exceeds the common mode voltage limit of ±2V. 1 12 3 +5V SUP (–) IN LO 5V RET DATEL UPA-5/500 120 VAC 11 (+) IN HI DP1 AC to DC Converter R2 R1 R3 1k 1k 1k DMS-40PC-1-GS DMS-40PC-2-RL 5 12 + – 11 1 4.5 - 18Vdc LM2931T-5 GND IN OUT +5V SUP 3 5V RET DP2 (+) IN HI (–) IN LO 22μF 10V + 1 3 +5V SUP 5V RET DATEL UPA-5/500 120 VAC 6 DP1 AC to DC Converter DMS-40PC-1-GS 12 (–) IN LO 11 (+) IN HI 1.5V CELL – 10 ANA COMM MPM_DMS-40PC.C03 Page 4 of 6 DMS-40PC Series 4½ Digit, LED Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com APPLICATIONS |
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