HP 8711C User Manual page 354

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in Chapter IO for a list of HewlaMackard sales and service offiies.
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The data 1 status notation in the upper left corner of the display screen indicates that the analyzer source or
receiver parameters have changed since the last complete sweep.
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The active measurement channel indicator is designated by a solid triangle f)l. The active measurement channel's
data trace and other oaramatar data is indicated bv baino briahtar than the inactive measurement channel's data.
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The measurement channel parameters for both channels always appear at the top of the display in this area.
4 The type of measurement for each measurement channel is displayed hare. If a measurement channel is turned off,
the display says "Off' hare.
This is the display format that is selected using the (-1 key.
6 This is the Scalalfliv that is selected using the (-1 key, in units appropriate to the current measurement.
This is the reference level. This value is the reference line in Cartesian formats or the outer circle in polar formats.
The reference level is selected using the C-1 key.
9 A "c' appears hare when a user-defined calibration is in use. If the frequency span has bean narrowed, the
notation becomes 'C?' to indicate that interpolated error correction is on.'
9 The message area is where you will receive massages from the analyzer from time to time. Most massages appear
only for a few moments before disappearing.
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This area indicates whether the scale is absolute lAbsI or relative IRaIl.
The sweep indicator appears hare in the lower left corner of the display when the analyzer is sweeping at a rata
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of lass than 1.5 s. At sweeptimes above 1.5 s the sweep indicator moves across the screen with the data trace.
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The reference level for the active measurement channel is indicated by a small triangle 1)) adjacent to the graticula
on the left.
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Title and data area.
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Active entry area: used to enter or adjust values for operating parameters.
Marker annotation area.
When averaging is turned on, the average indicator appears hare.
If a 'U' lfor uncalibratadl appears here at any time, your instrument will not perform accurate measurements and needs servicing. See Table 10-l
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