Manual

Functional description
16 Two-channel digital Oscilloscopes
Functional description
I - VERTICAL system (cont'd)
Configuration of
channels CH1, CH2
Each channel has its own menu.
1. Selection of the
input coupling
● Pressing "CH1"→"Coupling"→"AC" selects AC input coupling.
The DC component of the signal is blocked.
● Pressing "CH1"→"Coupling"→"DC" selects DC coupling.
The DC and AC components pass.
● Pressing "CH1"→"Coupling"→"GND" selects GROUND coupling.
The input signal is disconnected.
The CH1 input signal is a positive square wave displayed with DC input
coupling:
2. Bandwidth
limitation,
DOX2025B
DOX2070B
DOX2100B
● Pressing "CH1"→"BW Limit"→ "On" activates the "Bandwidth Limiter".
The sinusoidal signal > 20MHz is attenuated.
● Pressing "CH1"→"BW Limit"→ "Off" deactivates the "Bandwidth limiter".
The sinusoidal signal > 20MHz is not attenuated.
The image shows a sinusoidal signal at 20MHz (yellow trace) displayed with
theBP band limiter (BW) "On" (the blue trace is obtained with the BW "Off"):
DC
coupling
DC status
BW
≈20MHz
BW Limit symbol