Dataman 520 Series - Manual (Page 13)

DATAMAN oscilloscope
User’s Guide
2. Hardware
The information contained in this chapter will help you to understand the features of
your oscilloscope.
2.1. Hardware description of the DATAMAN 570 family
The DATAMAN 570 series of dual channel digital storage USB oscilloscopes
connect to the computer via USB. They are compatible with both USB 2.0 and USB
1.1. Measurement accuracy is achieved by the stability of the parts used together with
the computing power of the host computer. Calibration data is part of the HW, which
makes it impossible to loose the values (opposed to the calibration data located on the
diskette/CD). Therefore, it is possible to simply connect the hardware to any computer
(via a USB 1.1 or USB 2.0 interface). All you have to do is just install the software.
The DATAMAN 570 series oscilloscopes allow the user to measure waveforms using
two independent channels with resolution of 8 bits and sensitivity from 10mV/div to
5V/div (80mVfs to 40Vfs) in 9 steps. One division of the oscilloscope screen contains
32 dots. Input impedance matches the oscilloscope standards therefore any regular
oscilloscope probe (with minimum compensation range of 32pF) can be connected to
the device. The software supports 1:1, 1:10, 1:100 and 1:1000 probes. AC or DC
coupling and the type of probe can be independently selected for each vertical
channel. Any of the inputs can be grounded without disconnecting the probes from the
measured system. Vertical track position can be controlled with an accuracy of 1 pixel
of the oscilloscope screen. Measurement can be triggered from Channel A, Channel B
and/or External trigger input. Trigger threshold can be set independently for each
channel in the range of the whole oscilloscope screen with resolution of one pixel.
Threshold of the External trigger input is fixed to about 1.5V (TTL and CMOS
compatible). The DATAMAN 570 series oscilloscopes have the dual level triggering
system, which is further described in chapter 2.1.2. Oscilloscope hardware offers data
acquisition with a maximum rate of 50, 100 or 200MS/s depending on the model.
Therefore it is not possible to sample non-repetitive waveforms faster than every 20,
10 or 5ns (depending on the model). However, thanks to the random sampling
method, it is possible to sample repetitive waveforms with period of 200, 100 or 50ps
(depending on the model), which corresponds with equivalent sampling rate of 5, 10
or 20GS/s. For displaying waveforms acquired using the random sampling method we
use a system called WCD (Waveform Conformity Detection), which speeds up
display of changes to the measured waveform.
The oscilloscope hardware can acquire data in one universal mode.
Acquiring data before and after the trigger with selectable trigger position displays the
waveform before and/or after the trigger. The position of the trigger is selectable by
the user. In this mode the hardware of the oscilloscope starts data acquisition
immediately after the start of measurement. The trigger event terminates the data
acquisition after collection the data amount set by the user. The trigger position can be
set to any place between these margins. The “Hold Off” timer allows the user to
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