Search found 28 matches

by Bob Mehew
Wed Jan 26, 2011 7:59 pm
Forum: PicoLog
Topic: Voltage steps between ordered data is incorrect
Replies: 5
Views: 3816

Re: Voltage steps between ordered data is incorrect

Hmmm, the number of bits is not always 256 this is because in each of the ranges there is calibration and offset information. How curious, though I am unclear as to how this explains the 4.15mV / 3.9mV increment pattern. :? Or are these values indicative of the inherent error span in the accuracy o...
by Bob Mehew
Fri Jan 14, 2011 2:11 pm
Forum: PicoLog
Topic: Voltage steps between ordered data is incorrect
Replies: 5
Views: 3816

Re: Voltage steps between ordered data is incorrect

attached as BPC 4 59. Please note this seems to be standard behaviour and also occurs when using both channels, see 100817 BPC 6 5.
by Bob Mehew
Thu Jan 13, 2011 8:35 pm
Forum: PicoLog
Topic: Voltage steps between ordered data is incorrect
Replies: 5
Views: 3816

Voltage steps between ordered data is incorrect

My set up is a Pico ADC 200/100 and a PP/USB converter using Pico Log V5.20.3 software. We have just realised that the step interval between ordered data points does not equate to that predicted. For example, using a +/-500mV range with 8 bits, I expect to see a 1000/256 = 3.9mV step when the data s...
by Bob Mehew
Mon Sep 13, 2010 7:57 am
Forum: USB PC Data Loggers
Topic: Dual Channel Data Logging
Replies: 6
Views: 3376

Re: Dual Channel Data Logging

sorry wrong sample, the previous was set at 10ns which gave 20ns time steps as you predicted. Attached is one set at 164ns but the recording shows 327ns.
by Bob Mehew
Mon Sep 13, 2010 7:31 am
Forum: USB PC Data Loggers
Topic: Dual Channel Data Logging
Replies: 6
Views: 3376

Re: Dual Channel Data Logging

ziko wrote:Hi are you writing your own software or are you using PicoLog or PicoScope?

Kind regards
Picolog. see attached for example
100817 BPC 6 3.PLW
(372.67 KiB) Downloaded 248 times
by Bob Mehew
Wed Sep 08, 2010 11:18 am
Forum: USB PC Data Loggers
Topic: Dual Channel Data Logging
Replies: 6
Views: 3376

Re: Dual Channel Data Logging

Thanks for the info. I did mean 10us and not ns. I got this curious doubling in timebase for 1280ns and 640ns as well. Checking with AC mains noise, the clock is not a factor of two out. A separate check on a pulse shows that both channels are sampling at the same time, even at 640ns timebase settin...
by Bob Mehew
Mon Sep 06, 2010 5:46 pm
Forum: USB PC Data Loggers
Topic: Dual Channel Data Logging
Replies: 6
Views: 3376

Dual Channel Data Logging

I have just moved onto using both channels on my Pico ADC-200/100 and am rather confused. I set the time step at 10 micro seconds (or more precisely 10.24) and sought a fast block single set record of 32k samples. I anticipated that the resultant record would show a time step of 10 micro seconds and...
by Bob Mehew
Tue Jun 23, 2009 11:01 am
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

Received adapter today, reinstalled software and it works. :D

Thanks

Bob
by Bob Mehew
Fri Jun 19, 2009 9:13 am
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

Hi Ziko The BIOS names for the modes of operation of my lap top's parallel port are: "bidirectional", "ECP", "EPP" and "output only". I therefore presume that as the lap top was set to bidirectional, that is equivalent to standard and hence the port is not compatible with the Pico device. Thanks for...
by Bob Mehew
Wed Jun 17, 2009 7:34 pm
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

Hi Ziko I am unsure what you are suggesting I should do when I get into BIOS. My BIOS reports that the parallel port is enabled in a bidirectional mode (available alternatives are ECP, EPP and output only), the base I/O address is 3BC (available alternatives are 278 & 378) and that the interrupt is ...
by Bob Mehew
Wed Jun 17, 2009 1:42 pm
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

Hi Ziko I have tried switching port label using Device Manager to LTP 3 and then switching printer using port to LTP 3 which did allow me to print a test page. So it would appear that facility in Device Manager is purely a re-labeling capability. You say "See if you can change the printer port to me...
by Bob Mehew
Tue Jun 16, 2009 2:17 pm
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

Physically it is a single port on I presume the motherboard (have not opened up the case to check physical links!). The names LTP 1, 2 & 3 are only available in Device Manager and appear to be a simple name designation capability, or do I misunderstand that facility?
by Bob Mehew
Tue Jun 16, 2009 1:42 pm
Forum: USB PC Oscilloscopes
Topic: ADC 200 not recognised
Replies: 11
Views: 6563

ADC 200 not recognised

Tried installing software V5.20.3 on my IBM Think Pad R50e running XP SP3. I coupled up ADC 200/100 and got error message on starting up PicoScope "ADC-200 not connected". Noted Device Manager says LTP 1 uses resources 03BC - 03BE which some where I read was identified by Pico set up as LTP 3. So tr...