CSIII (MODEL 4310B) User’s Guide
DS50003057A-page 18
2021 Microchip Technology Inc.
3.3
ADJUSTING OUTPUT FREQUENCIES
The output frequency of the CsIII may be adjusted by ȳ = ±1 x 10
–9
with a resolution of
1 part in 10
15
. This is generally used for calibration purposes and is accomplished by
directly modifying the fundamental interrogation frequencies of the physics package,
and is thereby reflected on all outputs. To modify the programmed offset frequency,
select Delta-F from the Outputs menu.
Note:
Unless noted otherwise, all references to frequency refer to fractional fre
-
quency (Hz/Hz) and not absolute frequency (Hz).
FIGURE 3-3:
Adjust Output Frequency.
The Adjust Output Frequency panel appears, as shown
, reflecting the cur
-
rent programmed offset of the CsIII, in this case ȳ = 1 x 10
–13
. To change the offset fre
-
quency, enter a new value, between –999999 and 999999, into the edit field and click
Apply Changes to upload the correction to the CsIII. To exit the Adjust Output Fre
-
quency panel without applying changes, select Cancel. The updated output adjustment
is reflected in the Frequency Offset field following the next RS-232 update of the dis
-
played data.
3.4
SYNCHRONIZING TO A 1 PPS SOURCE
The 1 PPS output of the CsIII is generated by direct division of the 10 MHz RF output
and, as such, reflects the phase of one particular cycle of the 10 MHz. To synchronize
the 1 PPS output to an external user-supplied 1 PPS source, with 100 nS resolution,
connect the 1PPS source to the back-panel 1 PPS Sync input and select Synchronize
1 PPS to External Source from the Outputs menu. The panel appears as shown in
Summary of Contents for 4310B
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