Jackson Labs PHASE STATION 53100A, User Manual, Page: 209 / 225

PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 209
Compatibility notes
•
The following 51XXA commands and queries are not supported by TSERVE:
button <number> calinputs control <take | yield>
print [<options>] set print <options> set timeconstant <value>
show mac show printformats show printoptions show screens
• As discussed elsewhere, commands such as set referencefreq that affect both current and
subsequent measurements on the Symmetricom/Microsemi 51XXA phase noise test sets will
affect only subsequent measurements in TSERVE.
•
The show inputs command returns both “Current” and “Last Collection” values on the 51XXA
test sets. These values are not correctly maintained by the 51XXA test set firmware under
certain conditions, such as when the previous input signals are disconnected and different ones
reconnected. TSERVE does not attempt to emulate the 51XXA’s behavior in this regard.
Instead, both the “Current” and “Last Collection” values reflect the rounded frequency and
amplitude estimates for the measurement currently in progress. If no measurement is currently
being performed, the message
No measurement in progress
is returned to the client.
•
The streaming phase-difference values returned by TSERVE are based on the rounded or
specified input frequency reported by the
show inputs query. This is also true of the show
phasediff and show freqdiff chart entries. On the 51XXA test sets, however, these values are
referred to a more precise internal frequency measurement that is not made available to
remote-access clients. Consequently, only the
show fcounter command can be used to obtain
accurate frequency counts on the 51XXA test sets, while TimeLab’s own frequency count chart
in the
Measurement→Frequency difference (f) view can be used with phase data from TSERVE
if the correct rounded input frequency is entered in the acquisition dialog.
•
On the 51XXA test sets, the
show adev
command returns separate Allan deviation charts for all
supported t
0
intervals. TSERVE returns data only for the t
0
interval corresponding to the most
recent set phaserate or set tau0 commands.
•
The default phaserate for the 51XXA test sets is 1000 samples per second. TSERVE’s default
phaserate is 100 samples per second, unless changed with the
/phaserate
command-line option.
• The 51XXA test sets transmit measurement-related error messages to the Telnet client
asynchronously, sometimes waiting until the next character arrives from the remote client
before sending the message. As a rule, TSERVE transmits text on the Telnet command port only
in response to specific commands. The
show message command is provided to allow the
remote user or application to determine if the most recent measurement encountered an error
or warning condition. An empty string indicates that no errors or warnings have occurred.