VT DSO-2A20 Manual Rev. 1.1
Virtins Technology
You can choose to output either Rectangle or MLS signal. When MLS is selected, the
frequency value here refers to the clock frequency of the MLS generator rather than the
output signal frequency. By default, the Probe CAL signal output is enabled. You can disable
the signal output by un-ticking the “Probe CAL” checkbox. This will help to improve the
Signal-to-Noise ratio in the oscilloscope, especially when the measuring range is lower than
100 mV.
1.7 Hard Reset
A hard reset can be done via disconnecting the DSO from your computer and then re-connect
it to the computer again. You can only do this with the Multi-Instrument software closed.
1.8 Feature Highlights
The following sections highlight some unique features of the second-generation VT DSOs.
Most of these features are not available in other USB DSOs in the market. For a complete
description of functions, please refer to the Multi-Instrument software manual.
1.8.1 Hardware DSP based Bit Resolution Enhancement for Oscilloscope
Hardware DSP based bit resolution enhancement is a unique feature that is only found in the
second-generation VT DSOs. Virtins Technology is the first and currently the only company
to implement this feature in USB oscilloscopes. With this feature, an 8-bit ADC device
would be able to produce samples with an increased effective bit resolution as the sampling
frequency (defined here as its sample output rate) goes down. Theoretically, additional ½ bit
of resolution could be gained through some algorithm whenever the sampling frequency
decreases by a factor of 2. Therefore, an 8-bit ADC device could output samples with a 16-
bit effective bit resolution if the sampling frequency is 1/2
16
of its maximum sampling
frequency.
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