maximal voltage for the additional analog channels

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maximal voltage for the additional analog channels

Post  sjweng on Mon Nov 26, 2012 4:44 pm

Hi,

I am using a 60 channel USB-MEA system. I am planning to use one of the four additional analog input channels to record voltage signals generated by a stimulator, but I have no idea what the maximal voltage (through these 4 additional analog input channels) the amplifier can bear. Would you please give me some information on this? I am worrying If I use too high voltage the MEA amplifier might be destroyed. Thanks.

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Re: maximal voltage for the additional analog channels

Post  Thomas on Mon Nov 26, 2012 7:19 pm

Dear sjweng,

the analog input signals are not amplified, but they are just digitalized in the connected DAQ. Please check the input range of your data acquisition device in MC_Rack with connected hardware. Typically you should see a range of about +/- 4V, however it may varie depending on your device connected.

Greetings

Thomas

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Re: maximal voltage for the additional analog channels

Post  sjweng on Tue Nov 27, 2012 6:40 pm

Thanks, Thomas. I've checked the input voltage range in MC_Rack. Your are right: it is -4096 to +4096 mV.

Another question is that, if I connect a TTL (5 V) output to one of the analog inputs, and run the TTL device, will this damage the system?

-SJWeng

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Re: maximal voltage for the additional analog channels

Post  Thomas on Tue Nov 27, 2012 7:33 pm

No problem, you will just be clipping the signal
Thomas

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Re: maximal voltage for the additional analog channels

Post  sjweng on Wed Nov 28, 2012 12:06 am

Forgive my wordiness --- So it will be fine even if I am running the TTL device for a long time (e.g. the input voltage is at +5 V for tens of seconds, not just transiently) when it is connected to one of the analog inputs instead of a digital input port? I just want do make sure about this, because in the "(USB-) MEA-Systems Manual", I find such words:

...You could also use the analog inputs for triggering the MC_Card or the USB device, but please note that the digital inputs are intended for accepting TTL pulses...

Thanks!

Sjweng

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Re: maximal voltage for the additional analog channels

Post  Frank MCS on Wed Nov 28, 2012 9:57 pm

Dear Sjweng,
Thomas is travelling today. Applying 5V for an extended period of time to the Analog In won't damage the system. I don't know how a trigger detector set on this channel will behave, though. Just give it a try.

Best regards Frank MCS
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Re: maximal voltage for the additional analog channels

Post  sjweng on Wed Nov 28, 2012 11:21 pm

Thank you, Frank & Thomas. Now I am totally relieved. I have tried - The analog in can work as a trigger channel quite well when I connect a 5V TTL output to it: no damage, and I can use the TTL signal to trigger the recording. That's FanTasTic!

SJweng

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