Agilent Technologies L4400 Guía de usuario descargar pdf (Pagina 162)

150 L4400 User’s Guide

7 L4445A Microwave Switch/Attenuator Driver

Switch state is stored in the instrument. In contrast, the ROUTe:OPEN? and

ROUTe:CLOSe queries always check the actual hardware state of the switch

for verified channels.

For paired operations on the L4445A (using the

ROUTe:CHANnel:DRIVe:PAIRed:MODE command), when you enable

verification on either paired channel verification will be enabled on both

channels. In addition, the module checks for complementary position

indicators on the lower and upper channels of the pair (i.e., the position

indicators should indicate opposite states). If the state of the lower and

upper position indicators are found to be in the same state (due to a

hardware issue), an error is generated and the state of the lower channel

is assumed.

When the paired mode is disabled and pulsed mode is enabled, you cannot

query the open/closed state of the associated channels unless verification

is enabled. While in this mode (single drive operation), only “close”

operations are allowed on the channels (“open” operations are not

allowed). In this mode, a close operation provides a single pulse on the

specified channel.

If you enable verification on a non- paired (single drive), non- pulsed

(continuous drive) channel on the L4445A, the

ROUTe:CLOSe? and

ROUTe:OPEN? commands return the state of the verified device, rather than

the drive state of the specified channel. It is possible to have such a

channel being driven via a

ROUTe:CLOSe command by the channel position

indicators show the channel as open. In these cases, use the

ROUTe:CHANnel:VERify:POSition:STATe? command to determine exactly

which channels are currently being driven.

The ROUTe:CHANnel:VERify:POLarity command sets the logic polarity of

the verification lines on specific channels. You can specify the polarity as

NORMal (active high) or INVerted (active low).

If you have not enabled verification, you can still query the indicator state

of a specific channel using the

ROUTe:CHANnel:VERify:POSition:STATe?

command. This command is useful for channels on which verification is

disabled for activities such as debugging or when verification is disabled

for performance reasons.

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Agilent Technologies L4400 Guía de usuario Pagina 162