Models 707B and 708B 199BSwitching Matrix User's Manual
Section 2: Using the front-panel interface
707B-900-01 Rev. B / June 2013
2-7
Hot switching can dry-weld reed relays, causing them to always be on. Hot switching is
recommended only when external protection is provided.
You can perform operations on a single channel from the front panel.
To select a channel:
1. If the instrument is being controlled remotely, press
EXIT
to allow control from the front panel.
Turn the navigation wheel
until the channel specifier is displayed on the front panel.
2. To:
•
Close a channel without affecting any other channels: Select
CLOSE
.
•
Open the channel: Press
OPEN
.
•
Close a channel and open any other closed channels on the instrument: Select
CHAN
and select
EXCLOSE
. Press
ENTER
to close the selected channels.
•
Close a channel and open any other closed channels on the slot that contains the selected channel:
Select
CHAN
, and then select
EXSLOTCLOSE
. Press
ENTER
to close the selected channels.
Once a channel is selected, it is the selected channel for any subsequent front-panel operations.
Exercise: Select and close slot 1, row C, column 7 crosspoint
To select and close the crosspoint on slot 1, at row C and column 7:
1. To change the present row, press the navigation wheel. The first two digits of the four-digit
channel specifier flash, indicating edit mode.
2. Turn the navigation wheel
to change the digit to 1C.
3. Press the navigation wheel
. This accepts the row selection and selects edit mode for the
column. The last two digits of the channel specifier flash, indicating edit mode.
4. Turn the navigation wheel
to change the digits to 07.
5. Press the navigation wheel
or
ENTER
to accept the channel, exit edit mode, and return to the
main display.
6. To:
•
Open the channel: Press
OPEN
.
•
Close a channel without affecting any other channels: Select
CLOSE
.
•
Close a channel and open any other closed channels on the instrument: Select
CHAN
and select
EXCLOSE
. Press
ENTER
to close the selected channels.
•
Close a channel and open any other closed channels on the slot that contains the selected channel:
Select
CHAN
, and then select
EXSLOTCLOSE
. Press
ENTER
to close the selected channels.
Crosspoint display (Model 707B only)
The crosspoint display on the front panel of the Model 707B displays information about the slots that
contain cards and the open and closed state of the channels for one card slot at a time. If there are
no cards in the instrument's slots, the crosspoint display shows "No card in unit."
