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Connecting a Channel to
the Analog Bus
Chapter 2
analog bus. Once closed, a tree relay remains closed until specifically
opened (OPEN command, remove power from the module or reset the
module with a *RST command). Tree relays are listed in Table 2-2, which
also provides a description of each tree relay function. Most applications of
the E1476A Multiplexer will have you closing the VSA, VSB or both VSA
and VSB tree relays when using the
Table 2-2. Tree Relay Descriptions
Tree Relay
Channel
Designation
90
VSA
91
VSB
92
CS
93
RTA
94
RTB
Use the
<channel_list> command to close a channel (channel
CLOSe
00 - 63) or tree relay (channel 90 - 94). A channel or tree relay remains
closed until you specifically give it an
using the
command (removing power will open all channels and tree
*RST
relays because they are non-latching).
You must close a tree relay to connect a channel to the analog bus. For
example, close channel 23 on module number 1 and connect it to the analog
bus by closing the voltage sense bank A tree relay (channel 90). Refer to
"Figure 2-2. Channel Switching to the Analog Bus" on page 40.
CLOS(@123, 190)
Make measurement
OPEN(@123, 190)
and
OPEN
Functional Description
Connects the Voltage Sense H-L-G terminals
of the Analog Bus to the Bank A channels
(channels 00 to 31)
Connects the Voltage Sense H-L-G terminals
of the Analog Bus to the Bank B channels
(channels 32 to 63)
Connects the Current Source H-L-G terminals
of the Analog Bus to the Bank B channels
(channels 32 to 63)
Connects the Reference Thermistor to Bank A
for voltage sense (4-wire resistance
measurement of the thermistor)
Connects the Reference Thermistor to Bank B
for current source (4-wire resistance
measurement of the thermistor)
command or reset the module
OPEN
Channel 90 can be left closed
and other bank A channels
closed for measurement.
HP E1476A Switchbox Application Examples 39
commands.
CLOSe
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