Slowly for ten years using the full satisfaction of a PCS500 oscilloscope.
I bought this with a K8016 kit generator as well.
But it never worked properly.
The problem is the following:
The selected signal format is displayed only umpteenth attempt.
Not even sure that the voltage level or the frequency is correct.
If I’m patient enough, and then set the desired signal.
Thus, for example, bode plotter completely useless.
Although it is not pleasant, I would like to say that if an amplifier input 100 milivoltot given, and ten will be had from it. This sentence is now become a bit complicated.
I would like to be noted, this is not a computer, port speed, or software-dependent phenomenon.
The semiconductors have all switched, exception of the PAL, and perhaps the exception of the TDA8702.
The generator is less off the mark, if freezer beforehand.
In this case, a couple of minutes to work fairly.
But it does not warm here, nothing really.
Any idea, maybe because I want it to now normally used.
I’m sorry, that terrorizing the English language.
You may check that the shift registers IC2, IC3, IC19 and IC21 work OK.
Run the function generator program.
Keep all the generator settings as they are at the startup.
Click the sine waveform button.
Check the outputs of IC19 and IC21.
The outputs should be:
IC19
pin
15 = ‘1’
1 = ‘0’
2 = ‘0’
3 = ‘0’
4 = ‘0’
5 = ‘0’
6 = ‘0’
7 = ‘1’
You may use the PCS500 to check the waveforms on the pin 1, 2 and 3 of IC22.
When the sine waveform button is pressed to output the signal, there should appear following waveforms:
Thanks for your kind help!
I get the above values correctly when it successful.
If the 1 kHz does not appear correctly, the IC22 of 1, 2, 3, pins not received the signal properly.
What can I do after it?
One reason to the problems may be too low voltage from the PC’s printer port.
You may now check the voltage over C77 and C11.
If T8 is defective then the voltage over C11 is low.
I’d like to see the waveforms on pins 1, 2 and 3 of IC22 in case when the 1 kHz does not appear correctly.
When the waveform is capture with your PCS500, then in the File menu select “Save Image”.
Save the images in PNG format.
You can send the image files to my e-mail address: (email address removed)
Gyuri
PS.:
The 1 pin of the yellow line,and the 3 pin of the green line.
I used this a 10x oscilloscope cable.
The received signalform is not divided by ten.
Thank you for the data.
Indeed, it was good idea to send the data file in TXT format. This way I get much better view of the details of the data.
The waveforms on pin 1 and 3 of IC22 looks OK.
The screenshot indicates that the wave memory address counter is not working properly.
Or the shift registers IC2, IC3, IC19 and IC21 are not OK.
Next you can check the outputs of IC19 and IC21.
If they are as in the following list and if the sine waveform is “faulty”, then this indicate a problem in the address counters.
[quote]Indeed, it was good idea to send the data file in TXT format. This way I get much better view of the details of the data.
[/quote]
After all, that is why PC DSO.
This is a very interesting case.
You know, I really do not have electrical qualifications, take this into account.
Well, as shown above post, the relatively frequent error.
But not only is possible.
Is that the waveform is good, but the frequency is not.
Is that a good waveform, the frequency is also good, but there is DC offset, which should not be is.
Is that the device does not reach the Ready state at all.
The symptom is completely stochastic.
As I said, the integrated circuits have all exchanged.
With the exception of the IC22 (because you need to reprogram it. NB If possible, please send me the program) and if I remember correctly, the DAC is also original.
In any event, I continue to follow your suggestions …
If we solve this problem, I think both of us will be this great victory.
I hope you manage to decipher this message.
When you get the bad waveform at 1kHz setting please check the state of pin 5 of IC50.
If pin 5 of IC50 is LOW (as should be) and you still get the bad waveform then the IC50 is not working OK.
[quote]Is that the waveform is good, but the frequency is not.
Is that a good waveform, the frequency is also good, but there is DC offset, which should not be is.
Is that the device does not reach the Ready state at all.[/quote]
This all indicate that the data is not put correctly to the shift registers IC2, IC3, IC19 and IC21.
Next step is to check the data at the input pin of the shift register.
Select DC coupling and adjust the trace positions about like in the image below.
Set the trigger on and adjust the trigger level as set in the image.
Connect CH2 probe to pin 14 of IC2.
Connect CH1 probe to pin 11 of IC2. Set trigger on CH1.
Press the sine button of the function generator (at the 1kHz default setup).
The waveforms should look like this:
Change CH1 to pin 12.
The waveforms should look like this:
