integrated circuit testing, the main should be measuring the key test points.
General method is to use instrument testing every foot voltage and pin to ground resistance, the input and output voltage, power consumption and input/output waveform, and the test results contrast with normal integrated circuit parameters, can judge the integrated circuit to be tested is normal.
in the packaging machine
, the commonly used integrated circuit microprocessors, thick film integrated circuit and switch power supply operational amplifier IC.
Let's detailed analysis about these.
integrated circuit testing in the key of the integrated circuit test points.
The key to the microprocessor integrated circuit test point
the key to the microprocessor integrated circuit test point is mainly VDD power supply side, RESET, RESET, crystal IN vibration signal input, Xor crystal vibration signal output end of the input, output, and other circuits.
online test measure the key point of resistance and voltage value and normal can judge the integrated circuit is normal;
The key of the switching power supply IC test point
the key to the switching power supply IC test point is mainly Vc detection input end, voltage, current detection input, pulse output, etc.
online test was used to measure the integrated circuit voltage and the resistance of each pin, and then compared with data on normal, such as large difference, should also be testing related component, the component is determined under the condition of normal, can judge the integrated circuit has been damaged.
In the switch integrated circuit switch tube is the core component, the built-in thick film integrated circuit of large power switch tube when it's not good to doubt switch tube can be measured by switching tube c, b, e very between forward and reverse resistance to judgment.
Key operational amplifier IC test point
the key of the operational amplifier IC test point mainly is the input and output.
This point of static voltage value is higher.
test, the multimeter to dc voltage, measuring the output voltage value between the end and negative power supply end.
With hand metal tweezers, in turn, tapping the two input end of the operational amplifier (
Join the jamming signal)
, and watch the clock oscillation situation, normal, multimeter pointer will have larger oscillation, such as pointer does not move, then the operational amplifier has been damaged.
Electric bicycle specific integrated circuit point test.
in the packaging machine, the commonly used 555 time base integrated circuit TL494 circuit and circuit.
Let's specific look at the key points of specific test methods (
Determination of the integrated circuit T494 packing machine
integrated circuit testing for determination of the integrated circuit T494 in steps as follows.
Testing of integrated circuits to choose more functions, such as digital multimeter, models with MY68 practical type and MS820 type digital multimeter.
they can detect the frequency of 150 KHZ and 200 KHZ.
Also need a oscilloscope, adjustable resistance wire winding, etc.
Oscillation frequency measurement.
First screw multimeter to 200 KHZ, preliminary survey T494 oscillation rate (
On other integrated circuit such as below 200 hz, can adjust the gear)
, in order to accurately.
T494 oscillation in 5, and 6 feet, so the multimeter pens and in these two feet, they can determine the sawtooth wave.
Charger and control circuit of the oscillation frequency of 20 ~ 80 kh, the determination results is of certain value, the integrated circuit oscillation is normal, resistance capacitance value is correct.
if there is no signs of oscillation, shall check the contact point and pens and, wiring, etc.
If retest is still less than the numerical measurement of the integrated circuit has a problem.
if the frequency is not allowed, telling the Rr or Cr, visual situation appropriate adjustments or replacement.
Measuring the duty ratio.
Ready to oscilloscope, will T494 output pin 9, 10, connect the input interface of oscillograph, and advance to the 9, 10 feet and rated load.
Here it is important to note that no rated load, the duty ratio is not accurate measure, deviates from the value of the original design.
Observe the oscilloscope 9, 10 feet of the output waveform, at the same time adjust the duty ratio: to control element, adjust the speed regulating handle, by 0 spin;
The charger, adjust the resistance value from 0 to 6 feet (
The capacitance C, at the same time adjust)
At this time from the oscilloscope should see duty ratio changes from zero to one hundred percent range.
packing machine integrated circuit is normal or not is related to the machine can normal operation, so it is important, I hope this article packing machine integrated circuit test are helpful to you.
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