How Much Residual Noise Should There be on a Yokogawa Oscilloscope?

The true noise floor of a Yokogawa oscilloscope is ≤ 2-3mVpp.
The DL9000, for example, has approximately 280uV residual noise at 2mV/Div with input termination set to 50Ω.

The residual noise may be measured by making a Peak-Peak measurement with all cables and probes disconnected, and the V/DIV set to the lowest value. On the display will be a baseline of the internal noise of the scope. This noise occurs after the front-end attenuator circuit. In terms of visually comparing noise, verify these settings on your Yokogawa scope:
  • Sampling Mode: RealTime
  • Interleave: OFF
  • Attenuation: 1:1
  • Trigger Mode: Auto
  • Interpolation: OFF
  • Accumulate: OFF

If the attenuation ratio is not kept at 1:1, the residual noise level is multiplied by whatever attenuation factor you have set. A 10:1 passive probe has a 10:1 attenuation ratio which means that the probe divides the signal by a factor of 10 before it is introduced to the scope. The scope will compensate for this attenuation by multiplying the input signal by a factor of 10. Therefore, if the attenuation ratio is set to 10:1 using a 10:1 probe, you can expect the residual noise level to increase by a factor of 10, i.e. 2mVpp at 1:1 attenuation will be 20mVpp at 10:1 attenuation.

Please keep in mind that the residual noise level will vary with the V/DIV setting. When comparing two scopes, make sure that both scopes have the same setup in terms of attenuation factor and V/DIV.
 
Additional Information
For applications in which it may be necessary to compare noise with input ground (input coupling = GND), please use the 1:1 attenuation ratio setting. If your application is evaluating power supply noise, consider using a differential probe for better accuracy. A passive probe set at 1:1 may also be possible, depending on the accuracy of the measurement you are making, but keep the ground leads short to avoid additional noise.

Remember that probes, environment related, and the DUT itself will introduce additional noise. Please take the necessary precautions to prevent these additional noise sources. You may manage some of these noise sources through the use of Hi-Res mode, LP Filters, and /G2 User-Defined Math filters.

Related Products & Solutions

DL7440/DL7480 Digital Oscilloscopes

8-channel 500 MHz oscilloscope with 16 logic inputs, for applications where four channels aren't enough.  Support for eight analog channels, 16 bits with 250MHz logic bandwidth, 16MP of recording memory, power analysis, serial bus analysis, and a broad selection of voltage and current probes.

DL9000 DSO Series

500MHz, 1.0GHz, and 1.5GHz DSOs for debug and high performance applications. 10th
generation oscilloscope from Yokogawa with industry leading 2.5 million wfms/sec and lowest dead time. Winner of Test & Measurement World's "Best in Test" award.

DLM2000 Mixed Signal Oscilloscopes

200, 350, and 500MHz mixed-signal oscilloscopes for every engineer. Best-in-class performance in usability, acquisition, analysis, and display—all at a price you can digest. Options include serial bus, vehicle bus, and power supply analysis functions.

DLM6000 MSO & DSO Series

500MHz, 1.0GHz, and 1.5GHz DSO and MSO models for debug, waveform characterization, bench top, or automated test applications. 4 channel models with 16 or 32 logic inputs. 12th generation oscilloscope with ergonomic physical and on-screen improvements.

Mixed Signal Oscilloscopes

A mixed signal oscilloscope is an instrument enabling the simultaneous, time correlated observations and analysis of analog with digital (logic) signals, to establish causal relationships between the various areas of a device's electronics. They are purpose-built tools for troubleshooting electrical anomalies, measuring parametric values, and monitoring cause and effect relationships between signals.

Oscilloscopes

Capture, analyze, and troubleshoot electrical or real-world physical signals. Oscilloscopes observe the change of electrical signals over time, continuously graphed on a display as voltage or amplitude vs. time.

 
Top