The Tektronix TDS540C oscilloscope's simple graph can tell you many things about a signal, such as: the time and voltage values of a signal, the frequency of an oscillating signal, the 搈oving parts?of a circuit represented by the signal, the frequency with which a particular portion of the signal is occurring relative to, other portions, whether or not a malfunctioning component is distorting the signal, how much of a signal is direct current (DC) or alternating current (AC) and how much of the signal is noise and whether the noise is changing with time.

Performance Characteristics of the TDS540CForm Factor Benchtop 
Bandwidth 500 MHz 
Number of Channels 4 ch 
Simultaneous Channels 4 ch 
Simultaneous Maximum Sampling Rate/ch 1 GSa/s 
One ch. only max. sampling rate 2 GSa/s 
Max. Record Length 50000 pt/sec 
Min. Vertical Sensitivity 1 mV/div 
Maximum Vertical Sensitivity 10 V/div 
Channel to Channel Delay 50 ps 
Rise time 700 ps 
Number of Bits 8 bits 
Input Impedance 1 MOhm 
Input Impedance (alternate) 50 Ohm 
Input Coupling AC,DC,GND 
Maximum Input Voltage 400 Vrms 
Main time base - lowest 0.5 ns/div 
Main time base - highest 10 s/div 
Timebase accuracy 0.0025 % 
Trigger Source External,Internal 
Trigger Modes Auto,Edge,Logic,Normal,Pulse,Single 
Minimum Trigger Holdoff 16 ns 
Minimum Glitch Trigger 1 ns 
Display Type LCD 
Display Size 17.78 cm 
Display modes Zoom 
Display Update Rate 400000 wv/sec