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Vertical System
•
When the bandwidth limit is turned off, the high frequency components of the
signal under test can pass the channel.
•
When the bandwidth limit is turned on, the high frequency components found in
the signal under test that are greater than the limit are attenuated. The table
below lists the available bandwidth limits for different models.
Click or tap the channel status label at the bottom of the screen. Then the Vertical
menu is displayed. Click or tap the BW Limit drop-down button to select the
specified bandwidth. When the bandwidth limit is enabled, the character "Bw" will be
displayed in the channel status label at the bottom of the screen, as shown in the
figure below.
TIP
When the vertical scale is decreased to 500 μV from above 500 μV, the 250 MHz bandwidth
limit is automatically enabled; once decreased to 200 μV, the 20 MHz bandwidth limit will be
automatically enabled. In this case, even if the vertical scale is adjusted to 500 μV, the 20 MHz
bandwidth limit will still be used. When the vertical scale is adjusted to above 500 μV, the
bandwidth limit is automatically disabled.
Table 5.1 Bandwidth Limit
Model
HDO4404/HDO4804
HDO4204
TIP
Bandwidth limit can not only reduce the noise, but also can attenuate or eliminate the high
frequency components of the signal.
5.6
To Specify Input Impedance
To reduce the circuit load between the oscilloscope and the circuit under test, this
oscilloscope provides two input impedance modes: 1 MΩ (default) and 50 Ω. In the
Vertical menu, click or tap the Impedance button to toggle between "1 MΩ" and "50
Ω".
HDO4000 User Guide
46
Available Bandwidth Limits
20 MHz, 250 MHz
20 MHz
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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