Measurement Operations & Settings

Signal Conditioning

TIP: You can use INPut commands without a slot number if the 81560A/1A/6A/7A module is hosted by Slot 1. An INPut command is applied to Slot 1 by default.

Command Semantic

All the INPut and OUTPut commands applicable to the 8156A attenuator are also supported by the 81560A/1A/6A/7A modular attenuator family. In addition, the 81560A/1A/6A/7A modular attenuator family supports new commands to access its new features. To support these new features, and improve the usability of the instrument, the meaning (the semantic) of some existing commands has changed. This section lists all commands already available to the 8156A attenuator, notes whether the semantic of the command has changed, and where applicable, suggests how to handle the change.

Table 7 Comparison of command semantics beween 8156A attenuator and 8156xA modular attenuator family.

 

Command

Comment

 

 

 

 

INPut:ATTenuation

No change.

 

 

 

INPut:ATTenuation?

No change.

 

 

 

INPut:LCMode

No longer supported. Use the wavelength dependent offset command.

 

 

 

INPut:LCMode?

No longer supported. Use the wavelength dependent offset command.

 

 

 

INPut:OFFSet

No change.

 

 

 

INPut:OFFSet?

No change.

 

 

 

INPut:OFFSet:DISPlay

No change.

 

 

 

INPut:WAVelength

No change.

 

 

 

OUTPut:APMode

The 8156A uses this command to calculate a base power level while the instru-

 

ment 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 at-

 

 

tenuation 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 be-

 

 

cause 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.

166

 

 

 

Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition

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Agilent Technologies 8163A, B, 8166A, 8164A manual Command Semantic
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8163A, 8164A, 8166A, B specifications

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