JPS5572848A - Controller for hardness tester - Google Patents
Controller for hardness testerInfo
- Publication number
- JPS5572848A JPS5572848A JP14652078A JP14652078A JPS5572848A JP S5572848 A JPS5572848 A JP S5572848A JP 14652078 A JP14652078 A JP 14652078A JP 14652078 A JP14652078 A JP 14652078A JP S5572848 A JPS5572848 A JP S5572848A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- motor
- hardness
- constant
- solution
- 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
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
PURPOSE: To measure accurately hardness without providing a constant voltage circuit by detecting a load voltage by a voltage detection circuit parallel to a motor, which measures the hardness of a solution by turning blades in the solution, by driving the motor by a constant voltage by comparing its terminal voltage with a set voltage.
CONSTITUTION: Transistor 28 connecting to rectifier circuit 27 is controlled through comparing amplifier 32 applied with a voltage across motor 30 through voltage detecting resistance 31 in series to current detecting resistance 29 and a voltage from reference voltage source 33 to hold the across voltage of motor 30 constant, thereby driving motor 30 by the constant voltage without using a constant voltage circuit. Then, blades in a solution are rotated by motor 30 and the load voltage equivalent to solution hardness is detected voltage detector 35 connected in parallel to motor 30. Consequently, highly-precise measurement of hardness can be attained without using any constant voltage circuit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14652078A JPS5572848A (en) | 1978-11-29 | 1978-11-29 | Controller for hardness tester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14652078A JPS5572848A (en) | 1978-11-29 | 1978-11-29 | Controller for hardness tester |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5572848A true JPS5572848A (en) | 1980-06-02 |
Family
ID=15409500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14652078A Pending JPS5572848A (en) | 1978-11-29 | 1978-11-29 | Controller for hardness tester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5572848A (en) |
-
1978
- 1978-11-29 JP JP14652078A patent/JPS5572848A/en active Pending
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