Agilent Technologies 54622D Especificações descarregar pdf (Página 26)

Part Five – The Agilent 33220A 20 MHz Function/Arbitrary Waveform Generator (AWG)

Introduction

The Function Generator is the instrument that creates input signals used to test circuits and

systems in the laboratory. This section will show you how to create some basic waveforms

commonly used in the lab: sine, square, triangle and pulse waveforms, including DC offset.

The 33220A has a large number of capabilities beyond measuring these basic waveforms;

consult the Agilent User's Guide for information on capturing and using "arbitrary" waveforms,

noise, signals with AM, FM and FSK modulation, sweeping signals over a range of frequencies.

Operation of this "AWG" is easily learned, and fairly intuitive, as each front panel "hardkey" and

"softkey" (the buttons right under the display window in the picture below) when pressed for 2

seconds will provide context-senstive "help" on the display.

Output Voltage and the Load Resistance

Since this is a very important consideration, let's address it right now. Basic concepts:

 You can easily set the amplitude and DC offset of the output waveform.

 The output resistance of the AWG is always 50 Ω - this can't be changed.

 If the AWG output connector is connected to a load (device under test) with a 50 Ω

resistance, then the amplitude and DC offset voltage values you set will be the values

across the load.

 If the AWG output connector is connected to a load (device under test) with a high

resistance, then the amplitude and DC offset voltage values you set will NOT be the

values across the load. The output voltage will be twice what you set. This may

damage certain circuits (i.e. logic gate inputs).

 You can tell the AWG that the load resistance is not 50 Ω. This will make the

displayed voltage (the one you set) and the open-circuit voltage the same.

We will practice using 50 Ω and "high Z" load resistances very soon.

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Agilent Technologies 54622D Especificações Página 26