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US 5,107,201 AGranted
High voltage oscilloscope probe with wide frequency response
OwnerJohn S. Ogleinventor
Life of this patent
Estimating the term…
Abstract
A high voltage probe comprises a standard high frequency coaxial cable terminated in its characteristic impedance through most of the high frequency range, and a circuit of resistors and capacitors that provide a fixed division ratio regardless of the input frequency.
Claims9
A high voltage probe for attachment to an electronic instrument, the probe having a division ratio that extends the input voltage range of the instrument, comprising:
- a voltage divider having at least a first capacitor and a second capacitor connected in series such that a common electrical node is formed;
- means for connecting a device-under-test to the voltage divider such that an applied voltage divides across said at least first and second capacitors;
- a coaxial cable of a predetermined characteristic impedance having an inner an outer conductor and having a first and second end, the outer conductor at the first end connected to the second capacitor;
- an input resistor having a first end connected to the junction of said at lest first and second capacitors in the voltage divider, and having a second end connected to the center conductor of the first end of the coaxial cable;
- a termination circuit having a resistor in series with a capacitor, said resistor having a value approximately equal to the characteristic impedance of the coaxial cable, the termination circuit connected between the inner and outer conductors of the second end of the coaxial cable;
- and
- means for connecting the termination circuit to the electronic instrument.
4 more elements
A high voltage probe for use with a measuring instrument, comprising:
- a voltage divider having one or more high voltage resistors in series with one another and one or more high voltage capacitors in series with one another, with the resistance series circuit connected to the capacitance series circuit at both ends, a first end of the voltage divider having means to connect to a voltage measuring point, and a second end of the voltage divider connected to a grounded capacitor and resistor in parallel;
- an input circuit comprised of an input resistor in parallel with an input variable capacitor;
- a coaxial cable having a first end connected to the input circuit and a second end connected to a termination circuit comprised of a termination resistor approximately equal in value to the characteristic impedance of the coaxial cable, connected in series with a capacitor having a value that compensates for the capacitance of the coaxial cable;
- and
- means to connect from said termination circuit to the measuring instrument.
2 more elements
A high voltage probe for attachment to an electronic instrument, the probe having a division ratio that extends the input voltage range of the instrument, comprising:
- a voltage divider having at least a first capacitor and a second capacitor connected in series such that a common electrical node is formed;
- means for connecting a device-under-test to the voltage divider such that an applied voltage divides across said at least first and second capacitors;
- a pair of wires of a predetermined characteristic impedance having a first and a second conductor each having a firs and second end, the second conductor at the first end connected to the second capacitor;
- an input resistor having a first end connected to the junction of said at least first and second capacitors in the voltage divider, and having a second end connected to the first conductor at the first end of the pair of wires;
- a termination circuit having a resistor in series with a capacitor, said resistor having a value approximately equal to the characteristic impedance of the pair of wires, the termination circuit connected between the first and second conductors of the second end of the pair of wires;
- and
- means for connecting the termination circuit to the electronic instrument.
4 more elements
Dependencies are inferred from the claim text.