Hello everybody,

I get often asked if the DRS4 evaluation board can accomodate negative input pulses going to -1V. This is unfortunately not possible, since the board is mainly for evaluation of the DRS4 chip and should not be seen as a complete oscilloscope with flexible input stage. So the maximum it can do is -0.5V to +0.5V or 0V to 1V. For -1V signals, one can use however a passive inverter like this one:

http://www.phillipsscientific.com/pdf/460ds.pdf

And for signals going furhter (-2V, -10V) one can use a passive attenuator like this one:

http://www.pomonaelectronics.com/pdf/d4108_K5513_101.pdf

Best regards,

Stefan