Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 185
/format:<P, F, TSC>
Specifies the type of measurement data that will be broadcast via the TCP/IP data port
and/or logged to the specified file.
TSERVE writes Symmetricom 51XXA-style phase-difference data by default
(
/format:TSC
). This format consists of phase-difference values that have been inverted
and multiplied by the input frequency. You can also generate conventional (unscaled)
phase differences with
/format:P
or absolute frequency readings with
/format:F
.
Optionally, any warning or error messages can be forwarded to the connected TimeLab
client(s) by TSERVE for display in the status line. This capability requires the use of the
/notify
option on the TSERVE command line. If
/notify
is not used, data sent to the
TCP/IP streaming clients and/or shared file will always consist of numeric readings in the
specified format.
/inputfreq:<MHz>
By default, the DUT and reference input frequencies are measured at acquisition startup
time and rounded to the nearest 100 kHz. These nominal frequencies are reported by
the
show inputs
command and used as the basis for phase-difference readings. If either
frequency does not accurately reflect the nominal frequency of the corresponding input
source, the discrepancy will appear as a nonzero slope in successive phase-difference
readings. If the phase slope is due to insufficient DUT frequency precision, the
/inputfreq
option can be used to specify the precise DUT input frequency to be used
instead of the estimated value. Alternatively, /roundfreq can be used to force the
nominal input frequency to be logged at higher precision.
For example, if a DUT with a nominal frequency of 10.23 MHz is being measured and it is
desirable to minimize the slope of the phase-difference readings , either
/inputfreq:10.23
or
/roundfreq:0.01
could be used.
Note that the accuracy of the absolute frequency readings obtained with the
/format:F
switch depends only on the reference source, regardless of the nominal input frequency
reported by
show inputs . Consequently, it is unaffected by the /inputfreq or /roundfreq
options. As a result, the
/inputfreq
and
/roundfreq
options are not required in most
TSERVE measurements. However, note that if the nominal reference frequency is not a
multiple of 100 kHz, it is necessary
to use
/referencefreq
to avoid inaccurate results
regardless of the selected output format. See the
/referencefreq
option for more
information.