3
Operation
3-1
3.1
Introduction
This section contains basic information on using the Model
7038 including signal limitations, switching considerations,
and multiplexer expansion. For detailed mainframe operat-
ing information, refer to the Model 7001 or Model 7002 In-
struction Manual.
3.2
Signal limitations
CAUTION
To prevent damage to the Model 7038,
do not exceed the maximum signal level
specifications of the card.
To prevent over-heating or damage to the relays, never ex-
ceed the following maximum signal levels when using the
Model 7038:
•
Maximum voltage:
Any terminal (center or shield) to
any other terminal or chassis: 24V.
•
Maximum current:
10mA DC
•
Maximum power:
10W @ 1.2GHz
3.3
Front panel control
3.3.1 Closing and opening channels
Model 7038 channels are organized into three multiplexer
banks as follows:
Multiplexer bank A: channels 1 to 4
Multiplexer bank B: channels 5 to 8
Multiplexer bank C: channels 9 through 12
NOTE
On power-up, the Model 7001 display will
not show that channels 1, 5, and 9 are nor-
mally closed. If the instrument is to be op-
erated manually, close channels 1, 5, and
9 so that the Model 7001 display reflects
the actual state of the Model 7038. Execut-
ing a scan list will also ensure that the dis-
play reflects the actual state of the relays.
Closing channels
To close a Model 7038 multiplexer channel, simply key in
the CHANNEL assignment, then press the Model 7001/7002
CLOSE key. For example, to close channel 11 of a Model
7038 installed in slot 2, key in the following channel list, and
press CLOSE:
SELECT CHANNELS 2!11
You can also simultaneously close one channel in each mul-
tiplexer by including all channels in the channel list. For ex-
ample, to close channels 2, 6, and 10 of a card in slot 1, enter
the following channel list at the prompt:
SELECT CHANNELS 1!2, 1!6, 1!10
(Note that channels are separated by a comma, which can be
inserted by pressing either the ENTER or right cursor key.)
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