JPH0247505Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically determines the value of an impedance element provided in a part of an electronic device through follow-up adjustment.

When manufacturing electronic equipment, characteristic errors of each component appear in a multiplicative state. For this reason, in electronic equipment commonly used in the past, some low resistance elements or capacitive elements are used as variable elements, and the variable elements are used to perform follow-up adjustments after each component is assembled.

However, a variable element having a movable part cannot be used in electronic equipment such as electrical equipment used in a place where the usage environment is extremely harsh, such as vibration and temperature. For this reason, in the above-mentioned electrical equipment, etc., adjustment is performed using a fixed element, but this adjustment requires preparing various types of elements whose values differ in stages, and replacing these elements. However, it requires a great deal of effort and time to obtain the desired characteristics. This poses a serious problem in that especially when high precision is required, the effort and time required are enormous.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for automatically determining an impedance value for adjusting the characteristics or output value of an electronic device to a target value.

In order to achieve such an object, the present invention sequentially varies the impedance value between the terminals to which the final adjustment element is connected while monitoring the analog signal supplied from the electronic device to be adjusted, so that the analog signal is Fixed value elements corresponding to the impedance value at the time when the target range is reached are automatically displayed. Hereinafter, the impedance value determination device according to the present invention will be described in detail with reference to the drawings.

The figure is a circuit diagram showing an embodiment of the impedance value determination device according to the present invention, which is particularly applied to the determination of resistance values. In the figure, 1 is an analog-to-digital converter that converts an analog signal as a regulated output supplied from an electronic device to be regulated (not shown) between input terminals 2a and 2b into a digital signal, 3 is a keyboard, and 4 is a resistance value. 5 is a pulse motor that drives a variable resistor 6, and the variable resistor 6 is equipped with a resistor for follow-up adjustment of the electronic device to be adjusted (not shown) via probes 7a and 7b. connected between the terminals connected. Reference numeral 8 denotes a control unit composed of a microcomputer, etc., in which the output value of the analog/digital converter 1 is input to the keyboard 3.
The stepping motor 5 is controlled to adjust the variable resistor 6 so that the value falls within the range specified by the resistance value series stored in the memory 4. An operation is performed to select from and display it on the display section 9.

In the device configured in this way, when the probes 7a and 7b are connected between the terminals of the electronic device to be adjusted on which the resistor for further adjustment is mounted, the resistance value of the variable resistor 6 acts as the adjustment resistance value. Therefore, the electronic device to be adjusted is adjusted by this adjustment resistance value. Then, the output value of the electronic device to be adjusted at this point in time is supplied as an analog signal to the analog-to-digital converter 1, and after being converted into a digital value, it is supplied to the controller 8.

Here, when a target analog signal value range is specified using the keyboard 3, the control unit 8 controls the pulse motor 5 to adjust the variable resistor 6, thereby outputting an analog signal from the electronic device to be adjusted. Adjust the value to the target range. When such adjustment is completed, the predetermined current resistance value of the variable resistor 6 is determined from the number of control pulses applied to the pulse motor 5, and the value is displayed on the display section 9. Therefore, the user only needs to take out a resistor having the value displayed on the display section 9 and attach it between the terminals to which the probes 7a and 7b are connected to complete the adjustment. It is also possible to specify a resistor series using the keyboard 3, and if the analog value of the specified series of resistors does not fall within the standard, the data of the resistor series stored in advance in the memory 4 can be used. The series is automatically changed, and the contents of the changed series are also displayed on the display section 9. Therefore, when using the apparatus having the above configuration, the follow-up adjustment can be performed automatically and instantaneously.

In the above embodiment, the case where the driving resistance value was continuously varied using a variable resistor was explained, but it goes without saying that it may be adjusted in stages if high accuracy is not required. stomach.

As explained above, according to the impedance value determination device according to the present invention, the adjustment output connected between the element mounting terminals is monitored so that the value falls within the specified range while monitoring the adjustment output supplied from the electronic device to be adjusted. The variable impedance for adjustment is controlled and the value of the variable impedance for adjustment is displayed after adjustment is completed. Therefore, the operator can complete the follow-up adjustment by simply installing the fixed impedance element having the displayed value, which provides an excellent effect of making high-precision adjustment easy and in a short time. have

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of an impedance value determination device according to the present invention. 1...Analog-digital converter, 3...Keyboard, 4...Memory, 5...Pulse motor,
6...Variable resistor, 7a, 7b...Probe, 8
...Control section, 9...Display section.

Claims (1)

[Scope of utility model registration request] a variable impedance section connected via a probe between terminals on which an impedance element for further adjustment of the electronic device to be adjusted is mounted; a drive section that varies the value of the variable impedance section; a control unit that controls the drive unit so that the value of the output signal output from the electronic device to be adjusted falls within a specified range; and a control unit that controls the drive unit so that the value of the output signal output from the electronic device to be adjusted falls within a specified range; an impedance value determining device, comprising: a display section that displays the value of the variable impedance section;