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ES51982 Datasheet(PDF) 6 Page - Cyrustek corporation |
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ES51982 Datasheet(HTML) 6 Page - Cyrustek corporation |
6 / 21 page 11/01/05 6 ES51982 3 1/2 CAP AUTO DMM Reference voltage temperature Coefficient TCRF 100KΩ resister Between VRH 0℃<TA<70℃ — 50 — ppm/℃ Capacitance Measurement accuracy 2nF range -1.5 — 1.5 %F.S -2 — 2 counts 20nF – 2µF -0.8 — 0.8 %F.S -2 — 2 counts 2µF~2mF -1.1* — 1.1* %F.S -2 — 2 counts *The accuracy of 20uF range is 1.5%F.S Function Description 1.Operating Modes 1.1 Voltage Measurement A reconfigurable voltage divider automatically provides a suitable range in voltage measurement mode. The following table summarizes the full scale ranges in each configuration. Configuration Full Scale Range Divider Ratio Resister Connection VR1 200.0mV 1 - VR2 2.000V 1/10 R2 / (R1+R2) VR3 20.00V 1/100 R3 / (R1+R3) VR3 200.0V 1/1000 R4 / (R1+R4) VR5 2000V 1/10000 R5 / (R1+R5) 1. 200.0mV range only exists in manual mode. 2. In the 2000V range, if the digit number is larger than 1000V, LCD will display “OL”. The measurement of True RMS using ES636 If ES636 (or other true RMS-to-DC converter chip) is used for true RMS measurement, the suggested application circuit is shown in Figure 1. When ES636 is used for true RMS, make ADO and ADI pin short, keep TEST5 pin float, and connect ACVL pin to SGND. And connect OVSG pin to AGND through a switch in ACV mode. |
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