Metrix GX1010 Notice De Fonctionnement page 146

• Phase shift between MAIN and AUX at higher frequencies (only possible by setting AUX
to LF mode) will be different for those signals which are unfiltered compared to those
which, by default,
squarewaves/pulses from the comparator will be further phase shifted compared to LF
mode squarewaves of the same frequency because the sinewave driving the
comparator is significantly delayed by the filter.
• Setting squarewaves/pulses to LF mode at higher frequencies will also introduce 1 clock
edge uncertainty on the AUX output, even if this is still set to AUTO or HF, because the
comparator is now being driven by an LF mode waveform instead of the filtered
sinewave.
6.5.2.3. Frequency Modes for Sweep and FSK
For Sweep and FSK operation the MAIN and AUX waveform modes are fixed HF or LF
even if the setting on the Option menu is AUTO. The setting under these circumstances is
that of the main generator before Sweep or FSK were turned on. For example, if the two
FSK frequencies are 25kHz and 50kHz and 25kHz was the main generator frequency
before FSK was turned on FSK waveforms will be LF mode. In both cases however, the
automatic choice can be overridden by selecting HF or LF instead of AUTO in the
SQWAVE GEN= and AUX= fields of the Options menu.
6.5.2.4. Phase-shifted Asymmetric Waveforms
The interaction of symmetry adjustment and start/stop phase of triggered bursts gives
waveforms which are difficult to anticipate. In principle, adjusting the symmetry moves the
180° phase point from the 50:50 position of 50% symmetry to, for example, the 40:60 point
of 40% symmetry. The 0° - 180° points are now mathematically scaled to fit into 40% of the
cycle and 180° - 360° points are interpolated to fit into 60% of the cycle. Start/stop phase
still works with the true phase settings but they are not necessarily at the expected point on
the waveform, particularly for more complex waveshapes.
GX1010
have the filter in the signal path. For example, HF
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