Digital multimeter with microprocessor control
First Claim
1. Measuring apparatus for measuring values of electrical parameters of a device under test, the apparatus comprising:
- at least one input terminal adapted for connection to the device under test;
a selection unit for selecting electrical parameters to be measured;
a programmable controller controlled by the selection unit;
a resistive divider network controlled by the programmable controller, the network being operatively connected to the at least one input terminal, the programmable controller configuring the network for measurement of the value of a parameter of the device under test and generating a meter output signal indicative thereof; and
display means responsive to the meter output signal for displaying the value of the selected electrical parameter measured.
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Accused Products
Abstract
A digital multimeter includes a microprocessor control and a keyboard input. The microprocessor functions to control the display of parameters measured by the meter and displays such measured parameters. The keyboard includes switches to allow the user to select a parameter which is desired to be measured as well as a range of values for that parameter for use in measuring parameters of a device under test connected to the multimeter. The microprocessor communicates with the keyboard and functions to control a resistor and switch network to configure the multimeter to test selected parameters within selected ranges. The multimeter incorporates an overload protection function which compensates for an over-large voltage on the input leads of the multimeter, thus preventing damage to the circuit and to the multimeter.
59 Citations
25 Claims
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1. Measuring apparatus for measuring values of electrical parameters of a device under test, the apparatus comprising:
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at least one input terminal adapted for connection to the device under test; a selection unit for selecting electrical parameters to be measured; a programmable controller controlled by the selection unit; a resistive divider network controlled by the programmable controller, the network being operatively connected to the at least one input terminal, the programmable controller configuring the network for measurement of the value of a parameter of the device under test and generating a meter output signal indicative thereof; and display means responsive to the meter output signal for displaying the value of the selected electrical parameter measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification