288 Agilent X-Series Signal Generators SCPI Command Reference
Arb Commands
Dual ARB Subsystem–N5172B/82B ([:SOURce]:RADio:ARB)
:MDEStination:ALCHold
Supported N5172B/82B
CAUTION Incorrect automatic level control (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:ARB:MDEStination:ALCHold NONE|M1|M2|M3|M4
[:SOURce]:RADio:ARB:MDEStination:ALCHold?
This command enables the marker ALC hold function for the selected marker. For setting markers,
see “:MARKer[:SET]” on page 283.
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 leveling 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. For setting a marker’s polarity, see
“:MPOLarity:MARKer1|2|3|4” on page 290.
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. For setting the 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:ARB:MDES:ALCH M1
The preceding example routes marker 1 to the ALC Hold function.
*RST NONE
Key Entry None Marker 1 Marker 2 Marker 3 Marker 4
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