DL Series Oscilloscope Won't Measure Rise or Fall Time

If your DL series oscilloscope is not measuring rise or fall time, it may be because you are attempting to measure asymmetric waveforms. It is not possible to perform automatic rise or fall time measurements on DL series oscilloscopes when observing asymmetric waveforms. You will need to use a pair of cursors and manually set up the distal, mesial, and proximal reference levels.

This issue can be further explained as follows. When observing the falling portion of a waveform, with amplitude A, the FALL time will be measured. For the same waveform, observed on the rising portion, with an amplitude B where A>B or B>A, the RISE time will not calculate properly. This is caused by the fact that the max value was established when the FALL time was measured and is not reached when observing the RISE portion of the waveform. The two observed waveforms are asymmetric and have different max values.

Please see an example of this issue on the DL1600 in the attached screenshot. The rising step on CH1 is approximately 500V, with reference levels of:

  •  Distal: 90% or 0.9*500 = 450
  •  Mesial: 50% or  0.5*500 = 250 
  •  Proximal: 10% or 0.1*500 = 50

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.

Data Acquisition (DAQ)

Yokogawa data acquisition systems give you the most flexibility and power to measure, display, store, and even actuate any number of physical or electrical phenomena.

High Speed Data Acquisition

  • Yokogawa high-speed data acquisition systems
  • Industry-leading isolation, bit resolution, sampling rate, and memory depth
  • Independent channel hardware and easy to use software

Mixed Signal Oscilloscopes

  • Yokogawa mixed signal oscilloscopes
  • Simultaneous, time correlated observations
  • Analysis of analog with digital (logic) signals
  • Troubleshooting electrical anomalies, measuring parametric values, monitoring signals


  • Digital oscilloscopes
  • High-speed sampling
  • Range of bandwidths for electronic device design and development
  • Advantages of oscilloscope and multi-channel data recorder


  • Flexible, high-performance Yokogawa ScopeCorder
  • Modular platform combines mixed signal oscilloscope and portable data acquisition recorder 
  • Captures high-speed transients and low-speed trends 


Precision Making