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AGILENT 35670A
Supplemental Operator’s Guide
55
• Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted.
• Press the [Active Trace] hardkey.
• Press the [A] softkey (F2).
• Press the [Trace Coord] hardkey.
• Press the [MORE CHOICES] softkey (F6).
• Press the [REAL PART] softkey (F2).
• Press the [Active Trace] hardkey.
• Press the [B] softkey (F2).
• Press the [IMAGINARY PART] softkey (F3).
Assessing Measurement Quality
Measurement quality is described by coherence, which varies from 0 to 1. To set up
a coherence display, follow these steps:
• Press the [Meas Data] hardkey.
• Press the [COHERENCE 2 / 1] softkey (F7).
A coherence value of 1 means the response measured by Channel 2 was due to the
excitation of Channel 1. A coherence of 0 means that none of the response of
Channel 2 was due to the input measured by Channel 1.
Burst random excitation usually exhibits excellent coherence unless non-linearities
are excited.