Chapter 2 Vertical System Setting RIGOL
DS4000E User’s Guide 2-11
To Specify the Input Impedance
To reduce the circuit load caused by the interaction between the oscilloscope and the
circuit under test, the oscilloscope provides two input impedance modes: 1 MΩ
(default) and 50 Ω.
1 MΩ: at this point, the input impedance of the oscilloscope is very high and the
current flows into the oscilloscope from the circuit under test can be ignored.
50 Ω: match the oscilloscope with devices with 50 Ω output impedance.
Press CH1 and its backlight is illuminated; then, press Input to switch the input
impedance of the oscilloscope. When “50 Ω” is selected, the label as shown in the
figure below is displayed in the channel status label at the bottom of the screen; at
the same time, the character “50” under CH1 is illuminated.
Note:
After automatically identifying the probe, the oscilloscope indentifies the input
impedance automatically and you do not need to set the input impedance
manually.
The input impedance setting will affect the settable ranges of the vertical scale
and vertical offset of the channel. Please refer to “Specifications”.
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