Max input voltage and Input impedance of channel C and D

Products & Technology DSO Quad
#1

Hi,

What’s the max input voltage, and the input impedance of the D and C channel ?

Whats the diffrence between A and D channel, for example ? Both are working with a digital signal… (no analoge signal for test…).

Thanks,
Thibault

#2

1.the max input voltage is 80v with x1 proble and 400v with x10 peoble.
2. analog channel means the inputed signal was sampled with a A/D converter, and then displayed. while digital channel means the input signal was judged by the controller if it is “1”(high level) or “0”(low level).

#3

Thanks for answering.

I’ve experimented a sine wave form on the channel D, and I saw what do you mean… :wink:

Are you sur the maximum input voltage on D and C channel is 80Vpp ?

Thanks !

#4

actully, from the shematic, there is a CESD5V0AP at the input cuicuit of ChC and ChD, that is to say , when the input is <5V , the CTr/DTr will be same as input , when the input>5V, the CTr/DTr would be about 5V. so , maybe you do not need to consider the input range as the ChC and ChD are designed to detect the communication which is not exceed 10 V
and at the same time , the “impedence of channel C and D” is meaningless i think, maybe we can say : inpedance is 90K9 when the voltage <5V. :laughing: