Gabotronics XScopes, User Manual

Page: 13 / 45

XScopes
User’s Manual
DS-XScopes-3.5
– December, 2014
Page | 13
2. Mixed Signal Oscilloscope
The XScope is a mixed signal oscilloscope; it has 2 analog channels and 8 digital channels. This chapter will focus on the
analog signals. More information about the digital channels is presented in chapter 3.
2.1 Horizontal Settings
The horizontal settings are controlled
on the default menu. The menu is
shown on figure 18.
2.1.1 Time Base
The time base can be varied from
8µs/div to 50s/div. Table 4 shows all the
possible time bases. One time division
consists of 16 pixels. Example: 8µs / division = 8µs / 16 pixels

500ns / pixel.
Table 4: Time divisions *At 8µs/div, CH2 is not displayed.
2.1.2 Technical Details
There are two distinct sampling methods: Fast Sampling and Slow Sampling.
- Fast Sampling (10ms/div or faster): All samples are acquired to fill the buffer, and then they are displayed on
the screen.
o
Pre-trigger sampling (ability to show samples before the trigger) is available only with fast sampling.
o
Only 128 samples are visible at a time, varying the horizontal position allows exploring the full buffer.
- Slow Sampling (20ms/div or slower): Single samples are acquired and simultaneously displayed on the display.
o
The ROLL mode (waveform scrolls to the left during acquisition) is only available with the slow sampling.
o
All 256 samples are visible on the display (each vertical line will have at least two samples)
2.1.3 Explore Wave
The horizontal position can be varied on the Fast Sampling time bases. There are 256 samples for each channel, but
only 128 are displayed on the screen. When the acquisition is stopped, the full sample buffer can be explored with the K2
and K3 buttons. Pressing K2 and K3 simultaneously on the default menu will center the horizontal position.
When setting the XY mode, the graph can be moved vertically (Section 2.4.1.3).
2.1.4 Auto Setup
The Auto Setup feature will try to find the optimum gain and time base for the signals being applied on CH1 and CH2.
Time Base
( s / div )
Fast *8µ 16µ 32µ 64µ 128µ 256µ 500µ 1m 2m 5m 10m
Slow 20m 50m 0.1 0.2 0.5 1 2 5 10 20 50
Figure 18: Horizontal Menus