PicoScope 7 Software
Available on Windows, Mac and Linux
Picoscope 2206B
Picoscope 2206B
Hi,
Could you confirm Picoscope 2206B is capable to pulse an LED light with 20% duty cycle, 40kHz. And further, is it capable to capture fluorescence signal of a PMT and / or photodiode with sampling rate 10MHz for 200 seconds? or can you please advise a suitable unit for this task.
Thank you.
Could you confirm Picoscope 2206B is capable to pulse an LED light with 20% duty cycle, 40kHz. And further, is it capable to capture fluorescence signal of a PMT and / or photodiode with sampling rate 10MHz for 200 seconds? or can you please advise a suitable unit for this task.
Thank you.
Re: Picoscope 2206B
Hi Grommit,
You should have no problem driving an LED from the output of Signal Generator. 40kHz is a period of 20us, which for a duty cycle of 20% will give you a pulse width of 4us. The minimum pulse width in a PS2206B would be 1us (maximum frequency of 1MHz), so pulse width in the Arbitrary Waveform generator wouldn't be a problem. The maximum Sample Rate in the 2206B is 500MS/s so a 10MS/s Sample Rate wouldn't be a problem.
Unfortunately though, the buffer size is only 32MS so the maximum time that you could sample at that rate would be 3.2 seconds. Also, a lot will depend upon the level of the output from Photo-multiplier or photodiode, i.e. if it is a few uV maximum then you will have a problem the dynamic rage, because the minimum step size in the 2206B would be between 160-200uV, and that is without even considering the noise.
So, ideally you need a minimum of a PicoScope with a minimum 200MS buffer memory (i.e. 256MS) such as a PicoScope 4224A, which would also give you a better minimum step size of 10-12uV. With the PicoScope 4224A, you may also need a Differential Instrumentation Amplifier or suitable alternative to amplify the PMT/photodiode output (without adding significant noise) to a suitable level in order to be able to capture the output signal with the amplitude precision that you want.
Regards,
Gerry
You should have no problem driving an LED from the output of Signal Generator. 40kHz is a period of 20us, which for a duty cycle of 20% will give you a pulse width of 4us. The minimum pulse width in a PS2206B would be 1us (maximum frequency of 1MHz), so pulse width in the Arbitrary Waveform generator wouldn't be a problem. The maximum Sample Rate in the 2206B is 500MS/s so a 10MS/s Sample Rate wouldn't be a problem.
Unfortunately though, the buffer size is only 32MS so the maximum time that you could sample at that rate would be 3.2 seconds. Also, a lot will depend upon the level of the output from Photo-multiplier or photodiode, i.e. if it is a few uV maximum then you will have a problem the dynamic rage, because the minimum step size in the 2206B would be between 160-200uV, and that is without even considering the noise.
So, ideally you need a minimum of a PicoScope with a minimum 200MS buffer memory (i.e. 256MS) such as a PicoScope 4224A, which would also give you a better minimum step size of 10-12uV. With the PicoScope 4224A, you may also need a Differential Instrumentation Amplifier or suitable alternative to amplify the PMT/photodiode output (without adding significant noise) to a suitable level in order to be able to capture the output signal with the amplitude precision that you want.
Regards,
Gerry
Gerry
Technical Specialist
Technical Specialist