Tektronix 071-0590-00 How Totalize Results are Measured, How Window Results Are Measured

Reference

How TOTALIZE Results are Measured

Totalize results are measured continuously by the Analyzer. Totalize results can be cleared by the user (by pressing the CLEAR key when Totalize results are displayed). However, Totalize result accumulation is a continuous background process of the Analyzer and cannot be suspended by the user. The Totalize measurement process is illustrated in the figure below.

CLEAR

Untimed

Measurement Interval

TOTALIZE Process is continuous, but results may be cleared by the operator at any time.

Figure 3-4. The TOTALIZE Measurement Process

How WINDOW Results Are Measured

Window Mode results are calculated over a sliding window whose length is defined by the user. Window results can be cleared at any time by pressing the CLEAR key when Window Mode results are displayed. But as in the case of Totalize results, the Window measurement process cannot be suspended by the user.

Window results may be thought of as a series of snapshots of the received signal performance. Each snapshot indicates BER and total bit errors over the most recent interval T, where T is the value of the Window length set by the user. The amount of "slide" between snapshots is effectively determined by the display update rate which is about five times per second. Therefore the Window slide between display updates is about 200 ms. Note that End-of-Window reports are generated once per second so the effective window slide in printed results is one second. The Window measurement process is illustrated in following figure.

3-30 GB1400 User Manual