RIGOL Chapter 2 Vertical System Setting
2-12 MSO4000/DS4000 User’s Guide
6. Bias Voltage
Press Bias Voltage and turn the multi-function knob to adjust the DC bias
voltage.
Note: The adjustable range of the DC bias voltage is related to the probe model
and probe ratio (only for models that supports multiple probe ratios). For the
details, please refer to the technical specifications of the corresponding probe.
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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