Power supply for reducing the power consumption of digital oscilloscope
AssigneeHitachi Denshi Kabushiki Kaisha
InventorsHirohisa Ishida, Toshihide Okada
Life of this patent
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Abstract
In a digital oscilloscope for indicating an input signal waveform on a display, all or part of the circuits which constitute the oscilloscope are de-energized in accordance with at least one of an operation mode in which the digital oscilloscope has been set by the user and another mode of the oscilloscope. Alternatively, it is determined whether the digital oscilloscope is not operated for a time established by the user or more, and if it is determined that the oscilloscope is not operated for the set time or above, the display is de-energized.
Claims21
A method of controlling a supply of power to at least one circuit of a digital oscilloscope for indicating an input signal waveform on a display of said digital oscilloscope, comprising the steps of:
- setting a timer to count a predetermined period;
- detecting whether or not said digital oscilloscope is being operated
- starting said timer to count upon detection that said oscilloscope is not being operated;
- and
- stopping said supply of power to said at least one circuit to thereby stop a supply of power to said display when said timer has counted said predetermined period.
A method of controlling a supply of power to at least one circuit of a digital oscilloscope which operates in an operating mode which includes a run mode and a hold mode, said digital oscilloscope including a sampling circuit for sampling an input signal, a memory circuit for storing a sampled signal from said sampling circuit, a signal processor circuit for processing said signal stored in said memory circuit, a display circuit for displaying said signal processed by said signal processor circuit, and a power control circuit for controlling a supply of power to said sampling circuit, said memory circuit, said signal processor circuit, and said display circuit, comprising the steps of:
- determining an operating mode selected between said run mode and said hold mode by a user;
- and
- controlling said power control circuit in accordance with said operating mode selected so that said power supplied to said oscilloscope differs between said run mode and said hold mode.
A method of controlling a supply of power to at least one circuit of a digital oscilloscope, including a sampling circuit for sampling an input signal, a memory circuit for storing a sampled signal from said sampling circuit, a signal processor circuit for processing said signal stored in said memory circuit, a display circuit for indicating said signal processed by said signal processor circuit, a timer, and a power control circuit responsive to said timer for controlling supply of power to said sampling circuit, said memory circuit, said signal processor circuit, and said display circuit, comprising the steps of:
- supplying said power to said sampling circuit at a time when said timer is set;
- sampling said input signal when said sampling circuit is actuated;
- determining whether or not said sampled input signal meets predetermined criteria and outputting a signal representing a result of the determination;
- and
- controlling said power control circuit on a basis of said signal representing said result.
A digital oscilloscope for indicating an input signal waveform on a display, comprising:
- a charging circuit;
- a battery for being charged by said charging circuit;
- a display portion for displaying the waveform of an input signal;
- main circuits for processing said input signal and supplying said input signal to said display portion;
- a dynamic memory coupled to said main circuits, for storing said input signal from said main circuits;
- a converter for converting the output voltage of said battery into various different voltages which are supplied to said main circuits;
- and
- a regulating circuit for regulating the output voltage of said battery and supplying it to said dynamic memory.
Dependencies are inferred from the claim text.