FUNCtion:SHAPe USER
Select the function and output the selected arbitrary waveform. When
executed, this command outputs the arbitrary waveform currently selected
by the FUNC:USER command. The selected waveform is output using the
previously selected frequency, amplitude, and offset settings.
Use the FREQ, VOLT, and VOLT:OFFS commands to select the
frequency, amplitude, and offset of the waveform. Or, use the
APPLy command to select the function, frequency, amplitude, and
offset with a single command.
As shown in the following table, you can use the arbitrary waveform
function with all of the modulation modes. Each “
X” indicates a valid
combination.
For arbitrary waveforms, the maximum amplitude will be limited if
the data points do not span the full range of the output
DAC (Digital-
to-Analog Converter). For example, the built-in “
SINC” waveform does
not use the full range of values between
1 and therefore its
maximum amplitude is 6.084 Vpp (into 50 ohms).
For arbitrary waveforms, the Offset annunciator will turn on if the
waveform data has an inherent offset present (if the average is not
equal to zero). The function generator calculates the average of the
data points and compares the average to zero volts. If the average is
not within two
DAC (Digital-to-Analog Converter) counts of zero volts,
the
Offset annunciator turns on.
FUNCtion:SHAPe?
Query the output function. Returns “
SIN”, “SQU”, “TRI”, “RAMP”, “NOIS”,
“
DC”, or “USER”.
AM Carrier
AM Modulating Wave
FM Carrier
FM Modulating Wave
FSK Modulation
Burst Modulation
Frequency Sweep
Sine
X
X
X
X
X
X
X
Square
X
X
X
X
X
X
X
Triangle
X
X
X
X
X
X
X
Ramp
X
X
X
X
X
X
X
Noise
X
X
Arb
X
X
X
X
X
X
X
4
Chapter 4 Remote Interface Reference
Arbitrary Waveform Commands
177
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