JPS6466566A - Phase difference measurement - Google Patents
Phase difference measurementInfo
- Publication number
- JPS6466566A JPS6466566A JP22376187A JP22376187A JPS6466566A JP S6466566 A JPS6466566 A JP S6466566A JP 22376187 A JP22376187 A JP 22376187A JP 22376187 A JP22376187 A JP 22376187A JP S6466566 A JPS6466566 A JP S6466566A
- Authority
- JP
- Japan
- Prior art keywords
- time
- phase difference
- zero cross
- cpu
- amplitude data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measuring Phase Differences (AREA)
Abstract
PURPOSE:To detect a phase difference accurately, by determining zero cross time Tx and Ty of two analog signals while zero cross time Tz is determined for one thereof to compute a phase difference between the analog signals from the time Tx-Tz. CONSTITUTION:Input signals (x) and (y) are converted into digital from analog as indicated by 10 and 11 to be stored into RAMs 12 and 13. A CPU 15 first reads an amplitude data out of the RAM 12 to find a point of inverting the data and two amplitude data before and after the inversion are obtained to compute zero cross time Tx. Then, the CPU 15 further performs a reading out of the RAM 12 to find a point where the amplitude data turns to negative from positive value and the subsequent zero cross time Tz is computed while the time Tx is subtracted from the time Tz is computed while the time Tx is subtracted from the Tz to obtain a cycle Tw of the input signal (x). Then, the CPU 15 reads the amplitude data out of the RAM 13 to find a point where the polarity of the data inverts to compute zero cross time Ty before and after the inversion. Then, the CPU 15 performs a computation of (Tx-Ty)X360/ Tw to display 16 a phase difference in terms of angle. In this manner, the phase difference can be detected accurately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22376187A JPS6466566A (en) | 1987-09-07 | 1987-09-07 | Phase difference measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22376187A JPS6466566A (en) | 1987-09-07 | 1987-09-07 | Phase difference measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6466566A true JPS6466566A (en) | 1989-03-13 |
Family
ID=16803300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22376187A Pending JPS6466566A (en) | 1987-09-07 | 1987-09-07 | Phase difference measurement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6466566A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05180890A (en) * | 1992-01-08 | 1993-07-23 | Toho Gas Co Ltd | High speed measuring device for phase value |
| JP2008241668A (en) * | 2007-03-29 | 2008-10-09 | Daihen Corp | Ground fault detector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4942713A (en) * | 1972-08-31 | 1974-04-22 | ||
| JPS562310A (en) * | 1979-06-18 | 1981-01-12 | Shell Int Research | Improved shock resistant polymer and its manufacture |
| JPS5942460A (en) * | 1982-09-01 | 1984-03-09 | Toshiba Corp | Phase detecting device |
-
1987
- 1987-09-07 JP JP22376187A patent/JPS6466566A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4942713A (en) * | 1972-08-31 | 1974-04-22 | ||
| JPS562310A (en) * | 1979-06-18 | 1981-01-12 | Shell Int Research | Improved shock resistant polymer and its manufacture |
| JPS5942460A (en) * | 1982-09-01 | 1984-03-09 | Toshiba Corp | Phase detecting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05180890A (en) * | 1992-01-08 | 1993-07-23 | Toho Gas Co Ltd | High speed measuring device for phase value |
| JP2008241668A (en) * | 2007-03-29 | 2008-10-09 | Daihen Corp | Ground fault detector |
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