What is the input capacity of the ELVIS oscilloscope

[DizzyNL]

I did a little research to the high-frequency behaviour of ELVIS. For this I used a Common Emitter configuration. When I build this circuit on a normal breadboard the cutoff frequency is about 900kHz. This value has been  measured with a normal oscilloscope. When the same circuit is build on ELVIS and we measure the cutoff frequency with the normal oscilloscope it is still around the 900kHz. But when we attach the ELVIS oscilloscope to the output of the circuit, we measure a cutoff frequency of 200kHz with the normal oscilloscope. This means that there is possibly some 'big' capacitance, around 400pF which has big influence on high frequency. Does somebody have specifications of this?

Thanks in advance!

Wouter Bin

Message Edited by DizzyNL on 02-26-2008 05:35 AM

[RikPrins]

Hello Wouter,

Which DAQboard ar eyou using to connect to the NI-ELVIS?  BAssicly the osciloscope input channels on the ELVIS have the sepcifications of the Analog inputs of you DAQboard. So you could take a look in the usermanula of your DAQboard under Specifications and than Analog Input what is speced there.

 Regards,

RikP - National Instruments Applications Engineering