The University of Texas at Arlington

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• The University of Texas at Arlington
• Electrical Engineering Department
• Electric Circuit Lab
• Function Generator Agilent 33120A

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Function Generator Agilent 33120A
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• Introduction
• A function generator is used in many engineering
  fields to generate a wide variety of synthesized
  electrical signals such as the sine, square,
  triangle and ramp functions. These signals are
  used for testing and diagnostic applications.

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• Each workstation in the EE Undergraduate Circuit
  laboratory is equipped with Agilent 33120A
  function generators which can generate a variety
  of waveforms such as a sin, exponential and
  cardiac function. In addition, the HP33120A can
  generate arbitrary waveforms that you create and
  download from memory. By using Inruilink software
  you can create and output arbitrary waveforms.
• Each of the waveforms can be adjusted through the
  front panel controls or remotely for frequency,
  amplitude and DC offset voltage.

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• Setting Amplitude Voltage for Agilent 33120A
  Function/Waveform Generator
• As you might have already noticed that when you
  set voltage say 5V P-P on the Function Generator
  you seem to get double the voltage on the
  Oscilloscope like 10V P-P.
• The Main reason behind this is mentioned in
  pervious slide
• In order to Change the output impedance of the
  function generator to High Impedance , proceed
  with the following steps.
• 1.Switch on the Function Generator.
• 2.Press Shift Menu to get A MOD MENU.
• 3.Move across using (gt) button until u get D SYS
  MENU.
• 4.Now move down twice using (v) button to get 50
  OHM.
• 5.Now Press (gt) button to get HIGH Z .
• 6.Press Enter to save the Feature.
• 7.Now the Function Generators Output Impedance
  is set to High Impedance Mode. Make sure when u
  switch the Function Generator off it
  automatically goes to the default value (50 Ohm).
  So u need to repeat the procedure every time u
  switch it on.

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• The front panel has two rows of keys to select
  various functions and
• operations. Most keys have a shifted function
  printed in blue above
• the key. To perform a shifted function, press
  Shift (the Shift annunciator
• will turn on). Then, press the key that has the
  desired label
• above it. For example, to select the AM
  (amplitude modulation)
• function, press Shift AM (the shifted version of
  the key).
• If you accidentally press Shift , just press it
  again to turn off the
• Shift annunciator.

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• To set the output frequency
• At power-on, the function generator outputs a
  sine wave at 1 kHz with an amplitude of 100 mV
  peak-to-peak (into a 50 termination).
• The following steps show you how to change the
  frequency to 1.2 MHz.

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• 1 Enable the frequency modify mode.
• The displayed frequency is either the power-on
  value or the previous frequency selected. When
  you change functions, the same frequency is used
  if the present value is valid for the new
  function.

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• 2 Enter the magnitude of the desired frequency.
• Notice that the Num annunciator turns on and
  ENTER NUM flashes on the display, indicating
  that the number mode is enabled.
• To cancel the number mode, press

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