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Agilent 33500 Series
Waveform Generators
Dual-Channel Operation
Technical Overview
The Agilent 33522A dual-channel waveform generator To use these features from the instrument's front panel,
allows you to output waveforms on both channels indepen- press the channel output key above either channel's
dently. This allows you to flexibly drive a device under test output connector. Then press More > Dual Channel on
(DUT) in many common situations. However, some applica- the softkey menu. The menu shown in Figure 1 appears,
tions require you to combine two signals on one channel; showing the current state of dual-channel features.
for example, you may wish to add noise to a sine wave. Dual-channel operations are disabled in the factory
Other applications may require signals that are related to default state.
each other in some way. For example, you may wish to
simulate two clock signals, where one clock's frequency is
a multiple of the other's.
The Agilent 33522A includes features for meeting these
kinds of application challenges and more. You can use
these features from the front panel softkey menus or via
the Standard Commands for Programmable Instruments
(SCPI) programming language.
Figure 1. You can access the 33522A waveform generator's
dual-channel settings via the softkey menu. The Dual Channel
Operation menu allows you to adjust settings for frequency
coupling, amplitude coupling, tracking and combing waveforms.
Frequency Coupling [SOURce[1|2]:] Coupling enabled or
FREQuency:COUPle[:STATe] disabled
Frequency coupling allows you to specify that one channel's {ON|1|OFF|0}
frequency must be related to the other channel's frequency [SOURce[1|2]:]FREQuency:COUPle:MODE Type of coupling used
either by a ratio (multiplying) or an offset (adding). One {OFFSet|RATio} when STATe is ON
common use of this would be to simulate a device with [SOURce[1|2]:] Frequency added when
two clocks whose timing is related by a frequency ratio. FREQuency:COUPle:OFFSet MODE is RATio
Frequency coupling is enabled by the first softkey in the
[SOURce[1|2]:]FREQuency:COUPle:RATio Multiplier used when
Dual Channel Operation menu.
MODE is OFFSet
For example, suppose channel 1 has a frequency of 20 MHz.
If you specify a ratio of 1.35 on channel 1's Dual Channel
Operation menu, the frequency on channel 2 will be 27
MHz. If you then change the frequency on channel 1 to
16 kHz, the frequency on channel 2 will automatically
change to 21.6 kHz. If your frequency coupling is set to
Offset, a 100 kHz offset will set channel 2's frequency to
a value 100 kHz above channel 1's frequency.
In both cases (ratio and offset), changing channel 2's
frequency will change channel 1's frequency to maintain
the specified offset or ratio. Figure 2. On the 33522B waveform generator's
front panel display, a blue asterisk (*) indicates
The SCPI commands associated with frequency coupling coupled parameters.
are shown below.
Amplitude Coupling
Amplitude coupling ensures that
the amplitudes and offsets on both channels are the same.
When amplitude coupling is enabled, a change to either
channel's amplitude or offset will cause a change in the
other channel's amplitude or offset. Amplitude coupling is
the third softkey in the Dual Channel Operation menu.
You may implement amplitude coupling with or without
frequency coupling, and the front panel display uses a blue
asterisk (*) to indicate coupled parameters, as shown in
Figure 2.
The following SCPI command enables or disables
amplitude coupling.
[SOURce[1|2]:]VOLTage:COUPle[:STATe] {ON|1|OFF|0}
2
Tracking
Tracking means that one waveform is exactly the same
shape as another, though possibly a mirror image. Tracking,
which is configured under the fourth softkey in the Dual
Channel Operation menu, has three modes: