204
8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
4
Measurement Operations & Settings
Display and System Commands
The commands to adjust the instrument display (page 104ff) and query the
error queue (page 122) also work with the 816xA/B platform:
DISPlay:BRIGhtness
DISPlay:ENABle
SYSTem:ERRor?
OUTPut:APMode
The 8156A uses this command to calculate a base power level while the
instrument switches to another mode. This behavior is replaced by a mechanism
that is easier to use.
To calculate a power level at the device under test, formerly known as
through
power, the 81560A and 81561A attenuator modules use a reference power. This
reference power can be modified either via the user interface or by using the SCPI
command OUTPut:POWer:REFerence. The power is calculated from the
attenuation and the reference power using this formula:
P
set
(dBm) =
P
ref
(dBm) -
α
(dB)
The 81566A and 81567A attenuator modules do not need a base power level
because they are able to measure the output power directly.
Despite these new features, the 8156x modular attenuator family supports this
command, but only to address compatibility issues. The command only sets an
internal flag, which can be read using OUTput:APMode? You are free to choose
between adjusting the output power or adjusting the attenuation factor.
OUTPut:APMode?
It is now possible to adjust both power and attenuation without changing the
mode, so this command is supported only to address compatibility issues. This
query returns whether power (1) or attenuation (0) was changed last. All other
actions have no effect on this internal flag.
OUTPut:POWer
Except that the base power level is determined in another way (see
OUTPut:APMode), there is no change to the semantic of this command.
OUTPut:POWer?
No change.
OUTPut:STATe
No change.
OUTPut:STATe?
No change.
OUTPut:STATe:APOWeron
No change.
OUTPut:STATe:APOWeron?
No change.
Command
Comment
