产品名称：数字示波器（英文版）

The Tektronix TDS644A oscilloscope is a graph-displaying device – it draws a graph of an electrical signal. In most applications, the graph shows how signals change over time: the vertical (Y) axis represents voltage and the horizontal (X) axis represents time. The intensity or brightness of the display is sometimes called the Z axis.

The Tektronix TDS644A 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 “moving 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.

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Advanced Math
Floppy drive
Performance Characteristics of the TDS644A

Form Factor	Benchtop
Bandwidth	500 MHz
Number of Channels	4 ch
Simultaneous Channels	4 ch
Simultaneous Maximum Sampling Rate/ch	2 GSa/s
One ch. only max. sampling rate	2 GSa/s
Max. Single Shot bandwidth	2 GHz
Max. Record Length	2000 pt/sec
Min. Vertical Sensitivity	1 mV/div
Maximum Vertical Sensitivity	10 V/div
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	500 ps/div
Main time base - highest	10 s/div
Timebase accuracy	0.1 %
Trigger Source	External,Internal
Trigger Modes	Auto,Edge,Normal,Pulse,Single
Display Type	Color CRT
Display Size	17.78 cm
Display modes	Dot,Vector