Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 133
Measure two DUTs with single external
reference
This measurement role will yield two separate stability plots, one based on the phase differences
between channel 3 and channel 1 and the other based on the phase differences between channel 4 and
channel 1. No noise measurement will be performed in this case.
For each of the two plots, the DUT and reference frequencies displayed in that plot’s legend table row
will be rounded to the nearest 100 kHz. The frequency-difference traces will represent the fractional
frequency differences between the measured DUT signals and the displayed DUT frequencies as usual.
The frequency count charts for both plots will inherit the accuracy of the reference oscillator at channel
1, based on the assumption that the reference frequency is an exact multiple of 100 kHz.
Note that because channel 1 acts as a common reference for both stability plots, it’s not necessary for
the factory default reference-channel jumper configuration to be used as shown above. The reference
can be supplied directly to CH 1 IN if desired, with CH 2 IN left unconnected. (One advantage to using
the N-channel splitter input, however, is that the reference will not experience significant load-pulling
effects due to attenuator and filter selection as the measurement is initialized.)
Additionally, if the instrument is equipped with the internal reference option, you may connect CH 1 IN
to its adjacent INT REF output jack instead of using an external reference.
Measure three DUTs with single external
reference
This measurement role is identical to the previous one, except that the CH 2 reference input jack is
pressed into service as a third DUT input channel. Three stability plots (and no noise plots) will be
generated when the
Start measurement
button is pressed.
As an example, ADEV and frequency-difference plots in which three high-performance crystal oscillators
were measured simultaneously against a single cesium-beam frequency standard appear below.
All three plots were generated by the same measurement using the
Measure three DUTs with single
external reference role. The HP 5061A frequency standard was connected to the CH 1 IN jack, while the
three Oscilloquartz 8607 BVA oscillators were connected to CH 2 IN, CH 3 IN, and CH 4 IN.