Agilent Technologies Agilent 33500 Series Operating And Service Manual page 167

APPLy Subsystem
[SOURce[1|2]:]APPLy:NOISe [{< frequency> |DEF} [,{< amplitude >|MIN|MAX|DEF}
[,{< offset >|MIN|MAX|DEF}]]]
Outputs gaussian noise with the specified amplitude and DC offset.
<frequency> not applicable to noise function. Must be specified as a placeholder; the value is
remembered when you change to a different function.
<amplitude> Desired output amplitude in Vpp, Vrms or dBm, as specified by VOLTage:UNIT.1
mVpp to 10 Vpp into 50 Ω, or twice that into an open circuit.
If specified in Vpp, the peak to peak output will actually be output very rarely, due to gaussian
nature of noise.
<offset> is the DC offset voltage (default 0), from ±5 VDC into 50 Ω, or from ±10 VDC into an
open circuit.
Output gaussian noise bounded by 3 Vpp, with -2.5 V offset:
APPL:NOIS 5 KHZ, 3.0 V, -2.5 V
Frequency
If you specify a frequency, it has no effect on the noise output, but the value is remembered when you change to a
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different function.
For information on changing noise bandwidth, see FUNCtion:NOISe:BANDwidth.
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Offset Voltage
The relationship between offset voltage and output amplitude is shown below. Vmax is the maximum peak voltage
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for the selected output termination (5 V for a 50 Ω load or 10 V for a high-impedance load).
|Voffset| < Vmax - Vpp/2
If the specified offset voltage is not valid, the instrument will adjust it to the maximum DC voltage allowed with the
specified amplitude.
From the remote interface, a "Data out of range" error will also be generated.
Limits Due to Output Termination: The offset range depends on the output termination setting. For example, if you
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set offset to 100 mVDC and then change output termination from 50 Ω to "high impedance," the offset voltage dis-
played on the front panel doubles to 200 mVDC (no error is generated). If you change from "high impedance" to 50
Ω, the displayed offset voltage will be halved. See
[SOURce[1|2]:]APPLy:PRBS [{< frequency >|DEF} [,{< amplitude >|MIN|MAX|DEF}
[,{< offset >|MIN|MAX|DEF}]]]
Outputs a pseudo-random binary sequence with the specified bit rate, amplitude and DC offset.
The default waveform is a PN7 Maximum Length Shift Register generator.
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Parameter
OUTPut[1|2]:LOAD for details.
Agilent 33500 Series Operating and Service Guide
Typical Return
(none)