PicoScope 7 Software
Available on Windows, Mac and Linux
Picolog 6.1.10
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briankvedaras
- User
- Posts: 2
- Joined: Wed Nov 27, 2019 11:19 am
Picolog 6.1.10
Hi,
I have been capturing multiple simultaneous 50Hz waveforms at 1ms sampling rates using current probes, and have been calculating the RMS value cycle-by-cycle. This is OK, but laborious though it does have the advantage of being able to see excessive harmonic distortion in the waveform. I am using Picolog 6.1.10 using my 1012.
It would also be useful to me to have live RMS current values plotted on a chart, for 4-8 inputs and I was suddenly 'excited' by the mention of being able to measure AC voltage (or Frequency or dB values) using the instructions in the Picolog FAQs that says:
"It does, however, allow you to also plot AC voltage, frequency and dB figures for signals
that are too fast for the logger to capture the actual waveform."
It doesn't seem that Picolog 6.1.10 is offering the same configuration facilities that are mentioned in the FAQ, but presumably they are somewhere else. I am sorry if this is already asked on this board.
I have been capturing multiple simultaneous 50Hz waveforms at 1ms sampling rates using current probes, and have been calculating the RMS value cycle-by-cycle. This is OK, but laborious though it does have the advantage of being able to see excessive harmonic distortion in the waveform. I am using Picolog 6.1.10 using my 1012.
It would also be useful to me to have live RMS current values plotted on a chart, for 4-8 inputs and I was suddenly 'excited' by the mention of being able to measure AC voltage (or Frequency or dB values) using the instructions in the Picolog FAQs that says:
"It does, however, allow you to also plot AC voltage, frequency and dB figures for signals
that are too fast for the logger to capture the actual waveform."
It doesn't seem that Picolog 6.1.10 is offering the same configuration facilities that are mentioned in the FAQ, but presumably they are somewhere else. I am sorry if this is already asked on this board.
Re: Picolog 6.1.10
Hi Brian,
First of all, for anyone else reading this, the FAQ is being referred to is for PicoLog 5, not PicoLog 6.
What the comment is referring to is the PicoLog 1000 sample rate of 1ms and the PicoLog 5 sample mode of real-time continuous. Real-time continuous mode is just transferring each single piece of data over USB continuously, which can't be transferred any faster than 20 to 50ms. This is because it takes 10's of ms to establish a USB connection. However, the PicoLog 1000 can collect individual samples at a sample interval as small as 1ms. These can then be transferred to the computer in small groups when using the streaming sample mode.
So if I rephrase the comment so that it is a bit clearer and add the context so that it makes sense, it would read:
"If you find that you only log at about 20 to 50ms sampling rates, you are probably running in real-time continuous mode. This allows you to use multiple loggers at one time but the sampling rate is slow (20 to 50ms, depending on PC speed). 1ms cannot be obtained even if requested. The 1ms PicoLog 1000 sample rate does, however, allow you to also plot AC voltage, frequency and dB figures for signals that are too fast for the logger to capture the actual waveform, when using real-time continuous mode
To get a sampling rate of 1ms you need to be in Streaming (single converter only) and then click OK.".
PicoLog 6 does offer 1ms sampling for the PicoLog 1000 series data loggers. It just doesn't require you to specify a different sample mode (as PicoLog 5 does) in order to get it.
Unfortunately, you are sampling at a rate that is too fast to be able to stream the data from PicoScope 6 (which would be able to plot the RMS waveform) and PicoLog software works differently to PicoScope 6, (primarily in that it has to be able to capture data over longer ranges, without slowing the software down by increasingly larger accumulated calculations).
I hope this clarifies it for you.
Regards,
Gerry
First of all, for anyone else reading this, the FAQ is being referred to is for PicoLog 5, not PicoLog 6.
What the comment is referring to is the PicoLog 1000 sample rate of 1ms and the PicoLog 5 sample mode of real-time continuous. Real-time continuous mode is just transferring each single piece of data over USB continuously, which can't be transferred any faster than 20 to 50ms. This is because it takes 10's of ms to establish a USB connection. However, the PicoLog 1000 can collect individual samples at a sample interval as small as 1ms. These can then be transferred to the computer in small groups when using the streaming sample mode.
So if I rephrase the comment so that it is a bit clearer and add the context so that it makes sense, it would read:
"If you find that you only log at about 20 to 50ms sampling rates, you are probably running in real-time continuous mode. This allows you to use multiple loggers at one time but the sampling rate is slow (20 to 50ms, depending on PC speed). 1ms cannot be obtained even if requested. The 1ms PicoLog 1000 sample rate does, however, allow you to also plot AC voltage, frequency and dB figures for signals that are too fast for the logger to capture the actual waveform, when using real-time continuous mode
To get a sampling rate of 1ms you need to be in Streaming (single converter only) and then click OK.".
PicoLog 6 does offer 1ms sampling for the PicoLog 1000 series data loggers. It just doesn't require you to specify a different sample mode (as PicoLog 5 does) in order to get it.
Unfortunately, you are sampling at a rate that is too fast to be able to stream the data from PicoScope 6 (which would be able to plot the RMS waveform) and PicoLog software works differently to PicoScope 6, (primarily in that it has to be able to capture data over longer ranges, without slowing the software down by increasingly larger accumulated calculations).
I hope this clarifies it for you.
Regards,
Gerry
Gerry
Technical Specialist
Technical Specialist