Appendix
App-5
IM 2558A-01EN
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App
Appendix 4 Phase Shift Feature
Phase Shift Feature When the Frequency Is Set to EXT2
When EXT2 is selected, the 2558A generates voltage or current by adjusting the amplitude on the
basis of a signal computed by I×cos(φ) – Q×sin(φ), where φ is the phase setting. Here, when φ is
0° or 180°, sin(φ) becomes 0, so the Q signal is not used. When φ is ±90°, cos(φ) becomes 0, so
the I signal is not used.
Phase When the Frequency Is Set to EXT1
To produce a behavior that is close to the predecessor model, 2558, the phase when EXT1 is
selected will correspond to a phase setting of 180° for when EXT2 is selected. In this case, because
the Q signal is not used, operation at the same frequency is possible simply through the connection
of the I signal.
If an external oscillator is not used, two 2558As are synchronized according to section 7.2, and
EXT1 is selected on the slave device, the output phase of the slave device will be approximately the
opposite to the output phase of the master device.
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