Tektronix 2715, Руководство пользователя

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Getting Started
2715 User Manual
2–5
Whichever settings are used, the WARMUP message is displayed. It disappears
after a few seconds. Remember, however, that the spectrum analyzer may require
a full 15 minutes to be operating within specification. Consequently, measure-
ment errors and system messages can occur within the warm-up period,
particularly if you switch the spectrum analyzer to a narrow span or resolution
bandwidth (BW) filter.
You may also see the following phrase during warmup:
NORMALIZATION SUGGESTED
Normalization is a process by which the 2715 measures and stores its own
calibration parameters using a built-in reference. When this message appears, the
instrument is reporting that its self-test feature has determined that its perfor-
mance no longer matches that predicted by the previous normalization. It is not
unusual for the message to appear during the warm-up period, especially if a
narrow resolution bandwidth filter is called for by user-defined power-up
settings, or if the ambient temperature is different than that at which the previous
normalization was performed. If the message remains (or reappears) after the
warm-up period, a new normalization should be carried out. Normalization
ensures the utmost accuracy when making measurements. We suggest that,
whenever maximum accuracy is required, you allow your instrument to reach a
stable operating temperature in the environment in which the measurements will
be carried out and then perform a normalization before making the measure-
ments.
Perform a normalization to ensure the calibration of the 2715 and to verify its
operational status. Additional information about normalization may be found in
Normalizing the 2715 on page 6–65.
1. To do an initial normalization of the 2715, ensure that no external signals are
connected to the 2715.
2. Press [UTIL] and [3].
This calls up a menu that offers you a choice of normalization processes.
3. Select ALL PARAMETERS by pressing [0].
Normalization should begin immediately and continue without interruption
until it is completed.
Normalizing all parameters requires several minutes. During the process, you
will see various displays and messages which keep you informed of progress, but
do not require action. The process ends with an audible beep and the message
NORMALIZATION COMPLETE, indicating satisfactory operation. If you
receive any other message terminating this initial normalization, repeat the
procedure. If the message persists, contact your Tektronix Service Center.
Initial Normalization