Measurement apparatus detecting consumption current of a display
First Claim
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1. A measurement apparatus comprising:
- a display unit;
a current detection unit configured to output a detection signal if an increase in a consumption current of the display unit is detected;
a plurality of setting units each of which is configured to output an output signal, each of the plurality of setting units changing the output signal if the detection signal is received; and
a diagnosis unit configured to receive the output signal, the diagnosis unit diagnosing the increase in the consumption current, whereinthe current detection unit comprises;
an operational amplifier configured to receive a first input of a first voltage that is obtained by splitting an internal power supply voltage, and a second input of a second voltage that is dropped from the internal power supply voltage by a voltage amount that is based on the consumption current, the operational amplifier controlling elements through which the consumption current is flowing; and
a comparator configured to compare an output voltage from the operational amplifier with a third voltage that is obtained by splitting the internal power supply voltage, andthe current detection unit detects an increase in the consumption current based on comparison results from the comparator.
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Abstract
A measurement apparatus includes a display unit, a current detection unit configured to output a detection signal if an increase in a consumption current of the display unit is detected, a plurality of setting units each of which is configured to output an output signal, each of the plurality of setting units changing the output signal if the detection signal is received, and a diagnosis unit configured to receive the output signal, the diagnosis unit diagnosing the increase in the consumption current.
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Citations
17 Claims
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1. A measurement apparatus comprising:
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a display unit; a current detection unit configured to output a detection signal if an increase in a consumption current of the display unit is detected; a plurality of setting units each of which is configured to output an output signal, each of the plurality of setting units changing the output signal if the detection signal is received; and a diagnosis unit configured to receive the output signal, the diagnosis unit diagnosing the increase in the consumption current, wherein the current detection unit comprises; an operational amplifier configured to receive a first input of a first voltage that is obtained by splitting an internal power supply voltage, and a second input of a second voltage that is dropped from the internal power supply voltage by a voltage amount that is based on the consumption current, the operational amplifier controlling elements through which the consumption current is flowing; and a comparator configured to compare an output voltage from the operational amplifier with a third voltage that is obtained by splitting the internal power supply voltage, and the current detection unit detects an increase in the consumption current based on comparison results from the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A measurement apparatus comprising:
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a display unit including a driver; and a current limiting unit configured to supply a current from an external power supply to the driver of the display unit, the current limiting unit limiting the current, wherein a current value output by the current limiting unit is equal to or less than a predetermined value, and a drive current of the display unit is limited so that the measurement apparatus operates stably even if a consumption current of the display unit becomes excessive. - View Dependent Claims (9, 10, 11, 12)
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13. A measurement apparatus comprising:
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a current detection unit configured to detect a consumption current of a display unit, the current detection unit outputting a detection signal if an increase in the consumption current of the display unit is detected; a plurality of setting units each of which is configured to output an output signal, each of the plurality of setting units changing the output signal if the detection signal is received; and a diagnosis unit configured to receive the output signal, the diagnosis unit diagnosing the increase in the consumption current, wherein the current detection unit comprises; an operational amplifier configured to receive a first input of a first voltage that is obtained by splitting an internal power supply voltage, and a second input of a second voltage that is dropped from the internal power supply voltage by a voltage amount that is based on the consumption current, the operational amplifier controlling elements through which the consumption current is flowing; and a comparator configured to compare an output voltage from the operational amplifier with a third voltage that is obtained by splitting the internal power supply voltage, and the current detection unit detects an increase in the consumption current based on comparison results from the comparator. - View Dependent Claims (14, 15, 16, 17)
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Specification