Wow, Flutter, W&F, weighted and unweighted, JIS/DIN/CCIR and NAB. Help me!

[JP]

It saves a png of the plot when you run it. Not sure what you mean re: scale?

 

[Thomas_A]

It saves a png of the plot when you run it. Not sure what you mean re: scale?

It should save it, but I don't find it in the home dir.

Scale; it sets the scale to max frequency, e.g. 1001.26 and then ticks it from that, 1000,26, 999,26. Would be nice to have ticks/scale at integers. 1002, 1001, 1000...

 

[Thomas_A]

But why is W&F is a thing in the 21st century?

I just need to waste my time a bit and learn some Python as well.

 

[JP]

It should save it, but I don't find it in the home dir.

Scale; it sets the scale to max frequency, e.g. 1001.26 and then ticks it from that, 1000,26, 999,26. Would be nice to have ticks/scale at integers. 1002, 1001, 1000...

Ah.

 

[JP]

Ah.

@Thomas_A

That line only changes the label, not the grid location. I think:

maxf = int((max(max(if1),max(if2))+.2)+1)

and

myticks = []
for x in range(0,20,1):
myticks.append('{:4.0f}Hz'.format(maxf-(19*Hz_per_tick)+x*Hz_per_tick))

should change both label and location? I haven't verified.

 

[JP]

Of course the labels won't make sense if you go below 1Hz/tick.

 

[Thomas_A]

Of course the labels won't make sense if you go below 1Hz/tick.

Yes, I would probably just use 1 or 3 kHz signals. But the test records are just too flawed. Also the Denon XG-7001 which just arrived was disappointing.

 

[JP]

Yes, I would probably just use 1 or 3 kHz signals. But the test records are just too flawed. Also the Denon XG-7001 which just arrived was disappointing.

Yep. I’ve had okay luck if I index a decent record on a good ‘table so I know where the flaw in the record are. Then I always plot the same portion.

It’s not great but a lot better than a W&F number. Have caught a lot of issues this way.

 

[Thomas_A]

Four records 3150/3000 Hz. Not sure if I can see some common player things.

 

[JP]

There looks to be a pattern of wow that correlates on all the records, though to differing degrees.

 

[Thomas_A]

There looks to be a pattern of wow that correlates on all the records, though to differing degrees.

I know there is a 4.16 Hz component (slightly skewed motor shaft) but I am not sure if it is visible here. There might be a pattern as you say, but difficult to say what the origin is.

( know belt is very old, pulley and platter might need cleaning, I should change the caps on the regulator board etc, but fixing it is of low priority.)

 

[Balle Clorin]

thanks