Tektronix TDS200 Series User Manual

Understanding Oscilloscope Functions
20
TDS1000/2000-Series Digital Oscilloscope User Manual
Time Domain Aliasing. Aliasing occurs when the oscilloscope does not
sample the signa l fa st enough to construct an accurate waveform
record. When this happens, the oscilloscope displays a waveform
with a frequency lower than the actual input wave form, or triggers
and displays an unsta ble waveform.
Actual high-frequency
waveform
Apparent low-frequency
waveform due to aliasing
Sampled points
The oscilloscope accurately represents signals, but is limited by the
probe bandwidth, the oscilloscope bandwidth, and the sample rate.
To avoid aliasing, the oscilloscope must sample the signal more than
twice as fast as the highest frequency compone nt of the signal.
The highest frequency that the oscilloscope sampling rate can
theoretically represent is the Nyquist frequency. The sample rate is
called the Nyquist rate, and is twice the Nyquist frequency.

Tektronix TDS200 Series Specifications

General

Channels	2 or 4
Memory Depth/Record Length	2.5k points
Input Coupling	AC, DC, GND
Timebase Accuracy	50 ppm
Display	5.7-inch color LCD
Vertical Resolution	8 bits
Trigger Modes	Edge, Video, Pulse
Math Functions	Add, Subtract, Multiply, FFT
Maximum Input Voltage	300 Vrms
Power Requirements	100-240 VAC, 45-66 Hz
Bandwidth	100 MHz
Vertical Sensitivity	2 mV/div
Timebase Range	5 ns/div
Connectivity	USB
Input Impedance	1 MΩ