UDS−2030 * UDS−2020 * UDS−2012 Series PC−Sampling Oscilloscopes 

UDS-2020

Frequently Asked Questions

Why I have a problem with Autoscaling on the UDS-2020?

There can be several reasons. The main possibility is that the wrong trigger source was selected. Remember that the UDS-2020 must have an available trigger source and input. For example, if you are using the DIRECT TRIGGER INPUT, and the External Direct is selected in the Source menu, the trigger signal must be connected to this trigger input. Autoscale can then set the trigger level. If you are using the HF TRIGGER INPUT, and the External HF is selected in the Source menu, any of the trigger head should be connected to the HF TRIGGER INPUT, and the trigger signal must be connected to the input of a head. Autoscale can then set the optimal trigger controls depending on selected trigger head.

How Peak Detect can be used for acquisition of repetitive signal?

With the Peak Detect acquisition mode the UDS-2020 acquires waveform data points with specified sample interval, called detection interval. This detection interval can be much shorter than sample interval using in sample acquisition mode. Waveform anomalies are detected between samples because the UDS-2020 internally acquires samples at high equivalent sample rate (up to 50 GSa/s), independently on the equivalent sample rate or horizontal scale settings. From these extra samples, the minimum and maximum values are determined for each sample point. The minimum and maximum values for each sample point are then displayed. If a waveform is aliased, the minimum and maximum values will vary greatly and you will see significant waveform variance, or 'bands', on the display. When the Peak Detect acquisition mode is selected the oscilloscope works as follows:

  1. The software automatically sets the record length to 512.
  2. The oscilloscope calculates sample interval corresponding with selected time base.
  3. If calculated sample interval is equal or exceeds the value corresponding to the DETECT INTERVAL, the oscilloscope continues acquisition similar to the sample acquisition mode. The value of sample interval shown in the DETECT INTERVAL spin box is blackout.
  4. If calculated sample interval is less than value corresponding to the DETECT INTERVAL spin box, the oscilloscope continues acquisition in the peak detect acquisition mode. The value of sample interval shown in the DETECT INTERVAL spin box is intensified.

Use the Peak Detect acquisition mode in the following situations:

  1. For quickly finding waveform anomalies >20 ps wide that occur between samples at slow sweep speeds.
    2. 2. To see if a waveform is aliased.
  2. For acquiring waveforms that have low duty cycle.
  3. For waveforms having frequency components up to the scope's bandwidth.