Unlock instant, AI-driven research and patent intelligence for your innovation.

Automatic compensation of gain versus temperature

A temperature-relative and temperature-dependent technology, used in gain control, amplification control, and control of components of amplification devices, etc., which can solve the problems of sudden change in input channel gain, unexplainable measurement fluctuations, and accuracy limitations.

Inactive Publication Date: 2007-05-16
TEKTRONIX INC
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specified accuracy of many instruments is therefore limited by how much the gain of the instrument changes over temperature
Actual gain accuracy is also limited by how reliably the instrument user remembers to actually run the calibration routine, which in many cases takes more than a minute to run
Another disadvantage of recalibration is that the gain of the input channel may suddenly change after the calibration is complete, which can lead to unexplained measurement fluctuations from the user's point of view
The result is that the instrument may not stay within specification between calibrations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automatic compensation of gain versus temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Referring now to FIG. 1, a temperature sensor 12 senses the ambient temperature of a zone in the instrument, which is indicative of the temperature of the circuit whose gain drift is being compensated, and provides a voltage output V t . The temperature voltage V t The input is to amplifier 14 where it adjusts both gain and offset to be within the dynamic range of post multiplier 16 . The multiplier 16 scales the adjusted temperature voltage by a settable value that depends on the temperature / gain characteristics of the instrument, or more precisely the temperature / gain characteristics of the circuit being compensated. The settable value determines the amount by which the gain control adjusts relative to temperature. For instrument input channels with negative temperature / gain characteristics, set the settable value to positive. The larger the negative temperature / gain characteristic, the more positive the value that can be set. The output from the multiplier 16 is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An apparatus and method of automatically compensating gain versus temperature in a circuit of a measurement instrument that is subject to gain drift with temperature senses an ambient temperature for the circuit as a temperature voltage. The temperature voltage is scaled by a settable value representing a known temperature / gain characteristic for the circuit to produce a temperature correction voltage. The temperature correction voltage is subtracted from a reference voltage representing a gain for the circuit to produce a corrected reference voltage for the circuit.

Description

Background technique [0001] The present invention relates to the control of measuring instruments, and more particularly to the automatic compensation of gain versus temperature in oscilloscopes. [0002] Gain accuracy is an important parameter in a measurement instrument such as an oscilloscope because it benefits the quality of the measurement. Manufacturers now generally recommend that measuring instruments should be recalibrated whenever the ambient temperature of the environment changes by more than 5°C in order to keep gain accuracy within certain specifications. The specified accuracy of many instruments is therefore limited by how much the gain of the instrument changes over temperature. Actual gain accuracy is also limited by how reliably the instrument user remembers to actually run the calibration routine, which in many cases takes more than a minute to run. Another disadvantage of recalibration is that the gain of the input channel may change suddenly after the c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/00G01R1/00G01R35/00H03G3/00
CPCH03G1/00
Inventor B·T·希克曼
Owner TEKTRONIX INC