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Chapter 3 Features and Functions
Output Configuration
3
• Front-Panel Operation: To set the output frequency, press the Freq
softkey for the selected function. Then use the knob or numeric
keypad to enter the desired frequency. To set the waveform period
instead, press the Freq softkey again to toggle to the Period softkey.
• Remote Interface Operation:
FREQuency {<frequency>|MINimum|MAXimum}
You can also use the
APPLy
command to select the function, frequency
,
amplitude, and offset with a single command.
Output Amplitude
The default amplitude is 100 mVpp (into 50 ohms) for all functions.
• Offset Voltage Limitations: The relationship between output
amplitude and offset voltage is shown below. Vmax is the maximum
peak voltage for the selected output termination (5 volts for a 50Ω
load or 10 volts for a high-impedance load).
Vpp <
2 X (Vmax –|Voffset|)
• Limits Due to Output Termination: If you change the output
termination setting, the displayed output amplitude will be adjusted
(and no error will be generated). For example, if you set the amplitude
to 10 Vpp and then change the output termination from 50 ohms to
“high impedance”, the amplitude displayed on the function
generator’s front-panel will double to 20 Vpp. If you change from
“high impedance” to 50 ohms, the displayed amplitude will drop
in half. For more information, see “Output Termination” on page 63.
• Limits Due to Units Selection: In some cases, the amplitude limits
are determined by the output units selected. This may occur when the
units are Vrms or dBm due to the differences in crest factor for the
various output functions. For example, if you output a 5 Vrms square
wave (into 50 ohms) and then change to the sine wave function,
the function generator will automatically adjust the output amplitude
to 3.536 Vrms (the upper limit for sine waves in Vrms).
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