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Please explain PicoScope 3206 sampling rates!

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Please explain PicoScope 3206 sampling rates!

Postby kwdye77 » Wed Mar 30, 2005 3:51 pm

I am using the PS3000 example Labview vi. I have the PicoScope 3206, using a single channel. The 2nd channel is NOT routed to double the effective sampling rate, so I am assuming that the maximum sampling rate is 100 MS/second. The PicoScope 3206 documentation explains that the timebase enumerations number from 0 to 14--0 being equal to the max sampling capability (100 MHz in my case). Does this mean that a timebase setting of 14 equates to 6 KHz, and 6KHz is the minimum frequency I can select? My application requires a sampling rate around 2-3 KHz. How can this be accomplished?
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Postby Sarah » Fri Apr 01, 2005 8:49 am

Hi

Thank you for your post.

I have been checking with our engineers and unfortunately our documentation needs updating here. The maximum timebase for the PS3206 is now 21 (which gives a sample rate of 95Hz).

This will soon be amended in our documentation.

Hope this helps

Best Regards
Sarah
 

Postby kwdye77 » Fri Apr 01, 2005 3:35 pm

You mentioned that the PicoScope 3206 has a maximum timebase of 21--making the minimum frequency 95 Hz. Perhaps my math is wrong but at 21, I get the minimum timebase of .47 Hz. Please see the table below:
0 1,000,000.000000
1 500,000.000000
2 250,000.000000
3 125,000.000000
4 62,500.000000
5 31,250.000000
6 15,625.000000
7 7,812.500000
8 3,906.250000
9 1,953.125000
10 976.562500
11 488.281250
12 244.140625
13 122.070313
14 61.035156
15 30.517578
16 15.258789
17 7.629395
18 3.814697
19 1.907349
20 0.953674
21 0.476837
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Postby Sarah » Mon Apr 04, 2005 9:57 am

Hi

Thank you for your post.

The table should actually go something like this:

0: 200000000Hz (not available if 2 channels enabled)
1: 100000000Hz
2: 50000000Hz
3: 25000000Hz
4: 12500000Hz
5: 6250000Hz
6: 3125000Hz
7: 1562500Hz
8: 781250Hz
9: 390625Hz
10: 195312.5Hz
11: 97656.25Hz
12: 48828.125Hz
13: 24414.0625Hz
14: 12207.03125Hz
15: 9103.515625Hz
16: 3051.757813Hz
17: 1525.878906Hz
18: 762.9394531Hz
19: 381.4697266Hz
20: 190.7348633Hz
21: 95.36743164Hz

Hope this helps

Best Regards
Sarah
 

Postby kwdye77 » Tue Apr 26, 2005 6:10 pm

Sarah: I noted that timebase #15 in your table reads 9103.515625Hz which is not half of #14 12207.03125Hz. Is this a typo or correct?
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Postby Sarah » Wed Apr 27, 2005 8:25 am

Hi

Thank you for your post.

Yes, I believe number 15 should be 6103.515625Hz

Hope this helps

Best Regards
Sarah
 


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