JPS6439568A - Frequency measuring instrument - Google Patents
Frequency measuring instrumentInfo
- Publication number
- JPS6439568A JPS6439568A JP19675587A JP19675587A JPS6439568A JP S6439568 A JPS6439568 A JP S6439568A JP 19675587 A JP19675587 A JP 19675587A JP 19675587 A JP19675587 A JP 19675587A JP S6439568 A JPS6439568 A JP S6439568A
- Authority
- JP
- Japan
- Prior art keywords
- converters
- converter
- frequency
- triangular wave
- sampling clock
- 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
- 238000005070 sampling Methods 0.000 abstract 4
- 230000003111 delayed effect Effects 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
PURPOSE:To measure the frequency of a triangular wave without using any fast counter by using three A/D converters and two delay elements. CONSTITUTION:The triangular wave inputted from an input terminal 1 is A/D converted by A/D converters 2-4. Sampling clocks of those converters 2-4 are generated by a frequency generator 11. The sampling clock of the converter 2 is delayed by tau behind the sampling clock of the converter 3 is delayed by taua delay element 6 behind the sampling clock of the converter 4 by tau a delay element 6. Here, values obtained through the A/D conversion of the converters 2-4 are denoted as x2, x1, and x0. Then triangular waves which are A/D- converted by the converters 2-4 are supplied to subtracters 7 and 8 to calculate x2-x1 and x1-x0 and when a decision device 9 decides x2-x1=x1-x0, a ROM 10 is selected according to ¦x2-x1¦, so that a value corresponding to the frequency of the triangular wave is outputted from an output terminal 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19675587A JPS6439568A (en) | 1987-08-05 | 1987-08-05 | Frequency measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19675587A JPS6439568A (en) | 1987-08-05 | 1987-08-05 | Frequency measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6439568A true JPS6439568A (en) | 1989-02-09 |
Family
ID=16363073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19675587A Pending JPS6439568A (en) | 1987-08-05 | 1987-08-05 | Frequency measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6439568A (en) |
-
1987
- 1987-08-05 JP JP19675587A patent/JPS6439568A/en active Pending
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