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5000 series power supply

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5000 series power supply

Postby BSI » Tue Oct 14, 2014 7:02 pm

Hi,
I was wondering whether a 5243A (or 5244A) running with 2 input channels at 125MS/s could be powered up with a single USB ? I am hoping that the higher power requirements (1A or more) may only be required for the highest sampling rates and # channels. Thx
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laurent
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Re: 5000 series power supply

Postby Martyn » Fri Oct 17, 2014 10:50 am

We have run devices from a single USB port, most provide more than 500mA, with many supply up to 1A.

The advice is try it and see :)
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Re: 5000 series power supply

Postby BSI » Fri Oct 17, 2014 4:03 pm

Would you have some specs on the current consumption though vs load on the scope ? The digitizer is meant to be included with a system that has other requirements and we can't really guess our way around. It would be better to have a sense of the current draw beforehand.

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Re: 5000 series power supply

Postby Karunen » Mon Oct 27, 2014 12:00 pm

Hi,

A colleague ran a test with a 5443 and found the current consumption was around 990mA.

Please note the power supply is only require if you are using more that 2 channels.

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Re: 5000 series power supply

Postby BSI » Mon Oct 27, 2014 4:27 pm

Thx Karunen. Do you know how much this was related to sampling rate, etc..?
Thx
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Re: 5000 series power supply

Postby Karunen » Wed Oct 29, 2014 11:31 am

Hi,

The current draw will depend on:

• The sampling Rate (higher sampling rate will draw more power),
• The signal you are putting into the device,
• voltage source to the USB (The lower the voltage supply the higher the current draw will be),
• If the device is waiting for a trigger and
• The resolution settings.

Unfortunately we do not know how much this will vary the power draw.

While it would be possible to carry out tests, and work out the power draw, the number of combinations for a single scope model, and the number of models we have in our range, would make this impractical.

But if you can post here or email support@picotech.com with the settings you would be looking to use and the signal you would like measure I would be able to test the 5243A (or 5244A).

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Re: 5000 series power supply

Postby BSI » Thu Oct 30, 2014 5:30 pm

Thanks Karunen.
The settings would be as follows:


• 5243b, sampling Rate: 125 MS/s, 15 bits res.
• 2 inputs: one on ~ 2V range, one on 50mV Range,
• voltage source (if enough current available) : USB: 5V (PC)
• Waiting for triggers coming in at 512 Hz. # samples on each channel to acquire for each received trigger: min 800 ; max 6000.
• acquisition type: buffered: all triggers acquired to internal buffer first, then transferred to PC.
• # triggers: min 500, max 4000

Thx
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Re: 5000 series power supply

Postby Karunen » Wed Nov 05, 2014 3:55 pm

Hi,

Testing with your settings.

I found the voltage drop to be 5.07V or 5.06V

When waiting for a trigger the current draw is 870 mA, when collecting data it is 860mA and when idle it is 820 mA.

Hope this helps.

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Re: 5000 series power supply

Postby BSI » Fri Nov 07, 2014 11:53 pm

Thx Karunen,
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