Agilent X-Series Signal Generators SCPI Command Reference 331
Arb Commands
Two Tone Subsystem–N5172B/82B ([:SOURce]:RADio:TTONe:ARB)
CAUTION Incorrect ALC sampling can create a sudden unleveled condition that may create a spike
in the RF output potentially damaging a DUT or connected instrument. Ensure that you
set markers to let the ALC sample over an amplitude that accounts for the high power
levels within the signal.
[:SOURce]:RADio:TTONe:ARB:MDEStination:ALCHold NONE|M1|M2|M3|M4
[:SOURce]:RADio:TTONe:ARB:MDEStination:ALCHold?
This command disables the marker ALC hold function, or it enables the marker hold function for the
selected marker.
Use the ALC hold function when you have a waveform signal that incorporates idle periods, or when
the increased dynamic range encountered with RF blanking is not desired. The ALC circuitry
responds to the marker signal during the marker pulse (marker signal high), averaging the modulated
signal level during this period.
The ALC hold function operates during the low periods of the marker signal. The marker polarity
determines when the marker signal is high. For a positive polarity, this is during the marker points.
For a negative polarity, this is when there are no marker points. To set a marker’s polarity, see
“:MPOLarity:MARKer1|2|3|4” on page 333. For more information on markers, see “:MARKer[:SET]” on
page 283.
NOTE Do not use the ALC hold for more than 100 ms, because it can affect the waveform’s output
amplitude.
The marker signal has a minimum of a two–sample delay in its response relative to the waveform
signal response. To compensate for the marker signal delay, offset marker points from the waveform
sample point at which you want the ALC sampling to begin.
The ALC hold setting is part of the file header information, so saving the setting to the file header
saves the current marker routing for the waveform file.
NOTE A waveform file that has unspecified settings in the file header uses the previous waveform’s
routing settings.
For more information on the marker ALC hold function, see the User’s Guide. To configure marker
points, refer to the following sections located in the Dual ARB subsystem:
• For clearing a single marker point or a range of marker points, see“:MARKer:CLEar” on page 281.
• For clearing all marker points, see “:MARKer:CLEar:ALL” on page 282.
• For shifting marker points, see “:MARKer:ROTate” on page 282.
• For setting marker points, see “:MARKer[:SET]” on page 283.
NONE This terminates the marker ALC hold function.
M1–M4 These are the marker choices. The ALC hold feature uses only one marker at a
time.
Example
:RAD:TTON:ARB:MDES:ALCH M2
The preceding example routes marker two to the ALC hold function.
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