The data sheet for my oscilloscope says that the vertical input sensitivity is 1 mV/div to 10 V/div in 1 MΩ mode. But I turn the Vertical Scale control fully clockwise and I can only get down to 10 mV/div. What am I doing wrong?

Question:

The data sheet for my oscilloscope says that the vertical input sensitivity is 1 mV/div to 10 V/div in 1 MΩ mode. But I turn the Vertical Scale control fully clockwise and I can only get down to 10 mV/div. What am I doing wrong?

Answer:

You probably aren't doing anything wrong. But you do have a 10X probe attached to that channel, right?

The 1 mV/div specs relate to the oscilloscope inputs. If the signal’s source impedance is relatively low (<< 1 MOhm), the signal’s frequency is relatively low (less than a few MHz), and the voltage is within the input range of the oscilloscope, you can connect the signal directly to the oscilloscope with a cable and the vertical scale does go down to 1 mV/div in 1 MOhm mode.

However, when you attach an attenuating probe, the mV/div scale factor always increases by that same factor. This is a standard feature of oscilloscopes that automatically sense the probe attenuation.

Learn the XYZ's of Oscilloscopes »

This FAQ Applies to:

Product Series: DPO7000, High Voltage Single Ended Probes, MDO3000, MDO4000, MSO/DPO70000, MSO2000B / DPO2000B, MSO3000 / DPO3000, MSO4000 / DPO4000, MSO5000 / DPO5000, Passive Probe

Product: DPO2002, DPO2002B, DPO2004B, DPO2012, DPO2012B, DPO2014, DPO2014B, DPO2022B, DPO2024, DPO3012, DPO3014, DPO3032, DPO3034, DPO3052, DPO3054, DPO4014B, DPO4032, DPO4034, DPO4034B, DPO4054, DPO4054B, DPO4102B, DPO4104, DPO4104B, DPO5034B, DPO5054, DPO5054B, DPO5104, DPO5104B, DPO5204, DPO5204B, DPO70404, DPO70404C, DPO7054, DPO7054C, DPO70604, DPO70604C, DPO70804C, DPO7104, DPO7104C, DPO71254C, DPO71604C, DPO72004C, DPO7254, DPO7254C, DPO7354, DPO7354C, DSA70404C, DSA70604C, DSA70804C, DSA71254C, DSA71604C, DSA72004C, MDO3012, MDO3014, MDO3022, MDO3024, MDO3032, MDO3034, MDO3052, MDO3054, MDO3102, MDO3104, MDO4014-3, MDO4014B-3, MDO4024C, MDO4034-3, MDO4034B-3, MDO4034C, MDO4054-3, MDO4054-6, MDO4054B-3, MDO4054B-6, MDO4054C, MDO4104-3, MDO4104-6, MDO4104B-3, MDO4104B-6, MDO4104C, MSO2002, MSO2002B, MSO2004B, MSO2012, MSO2012B, MSO2014, MSO2014B, MSO2022B, MSO2024, MSO2024B, MSO3012, MSO3014, MSO3032, MSO3034, MSO3054, MSO4014B, MSO4032, MSO4034, MSO4034B, MSO4054, MSO4054B, MSO4102B, MSO4104, MSO4104B, MSO5034, MSO5034B, MSO5054, MSO5054B, MSO5104, MSO5104B, MSO5204, MSO5204B, MSO70404C, MSO70604C, MSO70804C, MSO71254C, MSO71604C, MSO72004C

FAQ ID : 58571

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