KR950012277B1 - If automatic control device - Google Patents

Abstract

The input DC voltage level of synchronous signal is clamped with respect to test point to minimize DC voltage level variation. The synchronous signal output from an IF signal generator(6) is supplied via an IF signal clamp board(40) for clamping output signal of the IF signal generator so that IF signal having constant voltage level is supplied to an A/D converter irrespective of signal level variation at TP point of a PCB assembly.

Description

Intermediate frequency (IF) automatic adjustment device using clamp board

1 is a block diagram of the present invention.

2 and 3 are operational flow diagrams according to the present invention.

* Explanation of symbols for main parts of the drawings

10: Computer 10 ': GPIB Controller

20: motor controller 20 ': motor

30: A / D Converter

40: IF (INTERMEDIATE FREQUENCY) Clamp Board

50: multiplexer 60: IF signal generator

70: Programmable Power Supply

80: D I / O (DIGITAL INPUT / OUTPUT) Board

80 ': PLC (PROGRAMMBLE LOGIC CONTROLLER)

90: PCB assembly 90 ': upper jig

90 ": Hajig

The present invention relates to a PCB automatic regulator. Especially, when a signal detected from a test point (TP) point is measured in an intermediate frequency (INTERMEDIATE FREQUENCY: IF) automatic regulator, a clamp board is used to determine the correct value by eliminating the DC level change. It relates to an intermediate frequency automatic adjustment device.

Conventionally, the measured signal detected at the TP point in adjusting the intermediate frequency of the PCB automatic regulator always outputs an inconsistent measurement value during A / D conversion due to the frequent change of the DC component. In the equipment, it became a big problem when adjusting, and because the signal intensity (DC component) is variable with time, it is difficult to find out the exact value when measuring, and the adjustment time is increased accordingly. Lacked productivity.

In the present invention, the DC component of the signal is clamped to keep the input signal constant based on the point synchronized with the H-SYNC signal of the IF signal generator to minimize the change of the input signal DC level so that the constant signal is always supplied. There is a purpose.

This will be described with reference to the accompanying drawings. The computer 10 sending control commands generates a programmable power supply 70 for outputting a DC voltage through the GPIB controller 10 ', a DI / O board 80 for inputting and outputting digital signals, and an intermediate frequency signal. IF signal generator 60, multiplexer 50 for selecting TP point signal, IF signal clamp board 40 for clamping intermediate frequency, A / D converter 30 and motor 20 for converting analog signals into digital signals. The programmable power supply 70 is interconnected by a GPIB bus to a motor controller 20 controlling the ") and interconnects the DI / O board 8 with a PLC 80 ' Connect the DC output terminal and the signal output terminal of the IF signal generator 60 to the PCB assembly 90 through the lower recess 90 "and connect the SYNC signal of the IF signal generator 60 to the IF signal clamp. The input to the board 40 and the A / D converter 30, and the TP point of the PCB assembly 90 to the multiplexer 50 It is connected to the IF signal clamp board 40 and the motor controller 20 is configured to control the motor 20 'installed in the upper teeth 90' to adjust the TP point of the PCB assembly 90.

This will be described in detail the operation and effect of the present invention by the accompanying drawings. After initializing the various devices, the PCB assembly 90 checks the start signal from the PLC 80 'at the correct position and if there is no error, the programmable power supply 70 is provided through the GPIB controller 10' in the computer 10. When the power ON command is issued to the programmable power supply 70, the programmable power supply 70 applies a DC voltage to the hagig 90 " by the power ON command and passes through the GPIB controller 10 'from the computer 10 to the IF signal generator 60. When the signal ON command is sent to the IF signal generator 60, the IF signal generator 60 outputs an intermediate frequency (IF) signal and supplies the signal to the leg 90.

At this time, PIF (PICTURE INTERMEDIATE FREQUENCY: Video Intermediate Frequency) SIF (SOUND IF: Audio Intermediate Frequency) AFT (AUTO FINE TUNING) : Automatic fine adjustment) A signal such as a trap (TRAP) is extracted by the lower recess 90 " pin, enters the multiplexer 50, and one of the signals (for example, PIF) is selected and the IF signal clamp board 40 is selected. It is input to and clamped.

Therefore, the intermediate frequency signal clamped by the IF signal clamp board 40 is output to the output (out), the analog signal is converted into a digital signal by the A / D converter 30 and then the computer via the GPIB controller 10 '. It is input to (10).

Therefore, since the computer 10 receives a stable signal without a change in the DC level as a digital signal by the IF signal clamp board 40, the computer 10 determines the measurement value by the adjustment algorithm by making a more accurate judgment. Rotate and adjust the motor 20 'through the motor controller 20 until the TP point (adjustment point) of the assembly 90 is found, and when the adjustment is completed, send the result to the PLC 80' and proceed to the next item. Turn off various devices.

As described above, the present invention clamps the SYNC signal output from the IF signal generator even though the signal strength (DC level) of the PCB assembly TP point is always supplied so that a constant signal is supplied to the A / D converter to increase the measurement and adjustment accuracy and to adjust it. It is an advantageous invention that can improve product productivity by reducing the TACK TIME.

Claims (1)

The computer 10 sending the control command is connected to the DI / O board 80 for inputting and outputting the digital signal through the GPIB controller 10 'and the PLC 80' for checking the start signal and the result value. And a multiplexer for selecting the TP point signal of the IF signal generator 60 and the PCB assembly 90, which supplies a signal to the programmable power supply 70 and the PCB assembly 90 that outputs the DC power to the hag 90 ". 50) and the A / D converter 30 for converting an analog signal into a digital signal and the motor controller 20 for rotating the motor 20 'to adjust the TP point of the PCB assembly 90, and the GPIB controller 10'. In a conventional PCB automatic regulator intermediate frequency (IF) automatic adjustment device which is interconnected to the computer 10 through the above, the SYNC output from the IF signal generator 6 even if the signal strength of the PCB assembly 90 TP point changes. A / D conversion through IF signal clamp board 40 which clamps signals and always outputs constant signals Automatic adjustment device for intermediate frequency using a clamp board, characterized in that connected to the machine (30).