2-8 Output Power Leveling Commands Programming with GPIB Commands
2-20 PN: 10370-10374 Rev. F MG369xC GPIB PM
2-8 Output Power Leveling Commands
Table 2-8 on page 2-21 lists the output power leveling command mnemonic codes. These commands provide for
(1) selecting linear or logarithmic power level operation, (2) selecting an RF output power level, (3) leveling the
output power, and (4) turning the output power leveling off. In addition, commands are provided for the level
offset, power level sweep, ALC power slope, and step attenuator decoupling functions. Figure 2-7 on page 2-22
shows an example of an output power level command string.
Linear or Logarithmic Power Level Selection
Power level operations can be linear or logarithmic. The commands LOG, PU0, and PU2 select logarithmic power
level operation. In logarithmic mode, power level entries and outputs are in dBm and power level sweeps are
logarithmic. This is the default mode.
The commands LIN and PU1 select linear power level operation. In linear mode, power level entries and
outputs are in mV and power level sweeps are linear.
RF Output Power Level Selection
The commands, L0 thru L9, call up each of the preset (or previously set) output power levels. Each command
causes its associated RF power level to be output and opens that power level's parameter for data entry. Each
command will also deselect any other previously programmed power level and will turn off a power level
sweep, if active.
Alternate Sweep RF Output Power Level Selection
In the alternate sweep mode, the commands, AL0 thru AL9, call up each of the preset (or previously set)
L0 to L9 output power levels. Each command causes its associated RF power level to be output during the
alternate sweep. Each command will also deselect any other previously programmed alternate sweep power
level. The commands do not open the L1 to L9 power level parameters for data entry. Use the commands, XL0
thru XL9 or L0 thru L9, to enter new power level values.
Output Power Leveling
There are three output power leveling modes of operation—internal, external (detector or power meter),
and fixed gain (leveling off). The IL1 command selects the internal leveling mode. In this mode, a signal from
an internal level detector is used to level the output power. This is the default mode.
The DL1 command selects the external (detector) leveling mode; the PL1 command selects the external
(power meter) leveling mode. In this mode, the output power is leveled using a signal from an external detector
(power meter) connected to the EXTERNAL ALC IN connector. In the external power leveling mode, the
EGI command provides for entering a setting for the Reference Level DAC to control the ALC gain. The
LVO command selects the fixed gain (leveling off) mode. Each command will also deselect any other previously
programmed output power leveling mode.
Programming Example:
Programming “PL1 EGI 140 SPS” selects external leveling of the output power using a signal from an
external power meter and sets the Reference Level DAC to 140.
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