JPS57175959A - Testing device for function of detecting circuit for number of revolutions of fan - Google Patents
Testing device for function of detecting circuit for number of revolutions of fanInfo
- Publication number
- JPS57175959A JPS57175959A JP6214781A JP6214781A JPS57175959A JP S57175959 A JPS57175959 A JP S57175959A JP 6214781 A JP6214781 A JP 6214781A JP 6214781 A JP6214781 A JP 6214781A JP S57175959 A JPS57175959 A JP S57175959A
- Authority
- JP
- Japan
- Prior art keywords
- revolutions
- signals
- fan
- signal
- detecting circuit
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
PURPOSE:To check a function, by a method wherein the nunber of revolutions of a fan is detected, and from a signal at a time when the detected number of revolutions exceeds or becomes below a given number of revolutions, an output signal of a detecting circuit for the number of revolutions of the fan, and a logic, it is detected whether or not the transition of the output signal of the detecting circuit for the number of revolutions of the fan occurs within a time of a given pulse width of a pulse signal. CONSTITUTION:A DC voltage A, corresponding to the number of revolutions of a fan, is compared with voltges P1 and P2 corresponding to a maximum and a minumum abnormal number of revolutions, respectively, to generates signals as shown in B and C. Signals D and E are obtained through detection of rise of the signals B and C. Signals F and G, having given pulse widths td1 and td2, are triggered by the signals D and E. Using D terminals of flip flop 8 and 9, a logic of a signal (i) from the detecting circuit for the number of revolutions of a fan to be tested and the signals F and G is taken. Or, if the signal (i) from a circuit to be tested is generated before given times td1 and td2 have elapsed from an abnormal point of time, signals H and J are obtained. If the logical product of the two signals H and H is taken, a signal K is obtained in case the circuit to be tested is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6214781A JPS57175959A (en) | 1981-04-24 | 1981-04-24 | Testing device for function of detecting circuit for number of revolutions of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6214781A JPS57175959A (en) | 1981-04-24 | 1981-04-24 | Testing device for function of detecting circuit for number of revolutions of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57175959A true JPS57175959A (en) | 1982-10-29 |
Family
ID=13191689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6214781A Pending JPS57175959A (en) | 1981-04-24 | 1981-04-24 | Testing device for function of detecting circuit for number of revolutions of fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57175959A (en) |
-
1981
- 1981-04-24 JP JP6214781A patent/JPS57175959A/en active Pending
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