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ES51918P Datasheet(PDF) 9 Page - Cyrustek corporation |
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ES51918P Datasheet(HTML) 9 Page - Cyrustek corporation |
9 / 32 page v1.08 06/04/03 9 ES51918 11,000 Counts Auto DMM 1.1.5 The true RMS-to-DC conversion with ES7 If ES7 is used for true RMS-to-DC measurement, the test circuit is shown in Figure 2. Make ADO and ADI pin short, and TEST5 pin keeps float. Connect OVSG pin to AGND through a switch in ACV measurement mode. If the DCV and ACV measurement modes are in the same rotary switch, please also add this switch in the rotary switch. The configuration of this switch will not influence the precision of DCV measurement. Figure 3. True RMS-to-DC conversion with ES7 OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH 1.111M 101K 10K 1K 99.5 AGND ACV AGND 1 2 3 4 8 7 6 5 2.2u + +Vs AGND -Vs 100K 1.5K -Vs N1 N2 AGND +Vs -Vs 2 3 1 5 4 7 6 AGND 1u + 47K TL061 30K 10K AGND ADI ADO ADOHZ PWD OP- OP+ OPO AGND 10K 30K 0.1u AGND +Vs +Vs -Vs 4.7u Note: The filter capacitors for +Vs and -Vs are recommended to near to the power terminals of ES7 and external OPAMP. |
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