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Correction constants are what give the analyzer its accuracy as well as its default calibration.
Incorrect or missing correction constants will result in the following poor performance:
Non-zero transmission trace when a good quality through cable is connected
Non-zero return loss measurement with a short or open circuit
Poor directivity
Output power inaccuracy
Analyzer-speci c correction constants are provided with each instrument shipped from the
factory. he correction constants are provided on a 3.5 inch
oppy disk and consist of one
le that is about 25 kbytes in size. Although each le is serial number speci c, the same le
name
is used for each analyzer. Since this is the case, les for di erent instruments must
remain stored on di erent disks. It is important that the proper disk be used with the proper
instrument.
Do not format or re-use the correction constants disk shipped with the analyzer unless you
are certain that the data on it is no longer needed. In general, correction constants cannot be
totally erased; they can only be updated (overwritten). he disk shipped with each analyzer
should be kept in a safe place and write-protected so that it cannot be accidentally erased.
Generally, this disk will never be needed unless the CPU assembly needs to be replaced.
New correction constants can be generated by performing the built-in adjustment routines.
(Refer to Chapter 2, \Adjustments," for detailed information.) Results from these adjustments
are always stored in volatile RAM. he user can then transfer this data to either the internal
oppy disk or the permanent EPROM.
he following correction constants procedures can be performed:
Storing Correction Constants to Disk (used to make a backup copy)
Loading Correction Constants from Disk (this places them into volatile RAM)
Storing Correction Constants to EPROM (permanently overwrites existing CCs with what is
currently in RAM)
Installing Correction Constants from Disk (a combination of loading CCs from disk and storing
to EPROM)
Storing Correction Constants to Disk
his will copy the current contents of the analyzer's CC data that is contained in RAM to the
internal disk drive. he instrument writes (or overwrites) a le named \CC DA X," where X is
the last digit of the analyzer's model number. his is generally used to make a backup copy and
may be very useful if the analyzer ever needs servicing.
1. Insert a formatted disk into the internal disk drive. (If needed, format the disk with the le
utilities menu under
Caution
Do not format the correction constants disk shipped with the analyzer unless
you are certain that the data on it is no longer needed.
2. Press
SYSTEM OPTIONS
8-2
Correct on Constants and F rmware
).
SAVE RECALL
5
ervice Update Corr Const
5
.
tore CC To Disk
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