Section 6: Model 3750 Additional Information
Series 3700 System Switch/Multimeter User's Manual
6-24
3700S-900-01 Rev. C / July 2008
Power consumption implications
The Model 3750 draws a significant amount of power from the Model 3706
mainframe in order to perform all of its functions. In cases where multiple Model
3750 cards are used, it is possible that not all Model 3750 functions can be
executed at the same time. The Model 3706 mainframe keeps track of power
requirements in real time and provides a notification if a power limit has been
exceeded. This notification is in the form of one or more error messages.
See
Power budgeting and calculation
(on page 9-2) for more information.
While operating the Model 3750, if a requested operation would consume an
amount of power that is not available, one of the following errors is generated:
#5513 "Not enough total power to complete requested card operation."
#5514 "Not enough bank power to complete requested card operation."
#5515 "Not enough slot power to complete requested card operation."
These errors mean that there was not enough available reserve power to
complete the requested operation on a total, bank, and slot basis, respectively.
As a result, the requested operation would not have been performed. To perform
the requested operation, more available reserve power is needed as described
in
Options for working with power consumption limitations
(on page 6-24).
Options for working with power consumption limitations
If the system is experiencing power limitations, there are two ways to possibly
improve the power capability of the system.
Turn off modes of operation or functions when they are not in use. For
example, backplane relays on switch cards and any non-latching relay types
that do not need to remain closed all the time. This conserves power and
results in more reserves available. Another example is to turn all digital I/O
as inputs when they are not needed as outputs.
Balance the power across banks. In the Model 3706 mainframe, the power
limitations are on a bank (3-slot) basis. By placing equal numbers of Model
3750 cards in each bank, the power constraints for the troublesome bank
may be relaxed. For example, a 4-card system would have Model 3750
cards installed in slots 2,3 and 5,6, instead of slots 1, 2, 3, and 4.
Additionally, system planning could result in a system where a Model 3750
that uses the highest amount of power would be located in the bank with the
most reserve available.
See
Power budgeting and calculation
(on page 9-2) for more information.