Keithley 7017, Instruction Manual

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3
Operation
3-1
3.1 Introduction
This section contains basic information on using the Model
7017 including signal limitations, switching considerations,
and applications. For detailed mainframe operating informa-
tion, refer to the Model 7001 or Model 7002 Instruction
Manual.
3.2 Signal limitations
CAUTION
To prevent damage to the Model 7017,
do not exceed the maximum signal level
specifications of the card.
To prevent overheating or damage to the relays, never exceed
the following maximum signal levels when using the Model
7017:
Maximum voltage: Any center conductor or shield to any
other center conductor or to chassis: 42V peak.
Maximum current: 1A carry, 0.5A switched per channel.
Maximum power: 10VA.
3.3 Front panel control
3.3.1 Closing and opening channels
Model 7017 channels are organized into two multiplexer
banks as follows:
Multiplexer A: channels 1 to 4
Multiplexer B: channels 5 to 8
To close a Model 7017 multiplexer channel, key in the
CHANNEL assignment (1 through 8), and then press the
Model 7001/7002 CLOSE key. For example, to close chan-
nel 4 of a Model 7017 installed in slot 2, key in the following
channel list, and press CLOSE:
SELECT CHANNELS 2!4
To open a closed channel, press OPEN or OPEN ALL.
You can also simultaneously close one channel in each mul-
tiplexer by including both channels in the channel list. For
example, to close channels 1 and 5 of a card in slot 1, enter
the following channel list:
SELECT CHANNELS 1!1,1!5
Note that channels are separated by a comma, which can be
inserted by pressing either the ENTER or right cursor key.
NOTE
To maintain 50
Ω
characteristic imped-
ance, close only one channel per multi-
plexer simultaneously. Closing more than
one channel per multiplexer may cause
unexpected results. Program the Model
7001/7002 for restricted operation to
avoid closing more than one channel at a
time.
Again, you can open closed channels with the OPEN or
OPEN ALL key. OPEN opens only channels in the channel
list, and OPEN ALL opens all channels.