EXFO IQS-1700 High Performance Power Meter for IQS-500/600 - Manual (Page 63)

Recording Power Signal Variations
High Performance Power Meter 55
The results of the Min./Max. function are continuously updated in the
matching lists. When a logarithmic scale is used, the Max.Min.
calculation is made to continuously provides the difference between the
two extremes. In a linear scale, the Min./Max. ratio is computed to provide
valuable information.

If the power reaches the saturation level, +++++++ will be
recorded as the Max. value. The Max.-Min. or Min./Max. calculation will
also be +++++++.

If the detected power decreases below the lowest measurable power,
the Min. value will be – – – – – – – and both Max.-Min. or Min./Max. will
display – – – – – – –.

If a Min./Max. calculation is made with a null Min. value, ! ! ! ! ! ! ! will
be displayed.

If a channel is shown in the data display but is not part of the selected
channels for a Min./Max. acquisition, * * * * * * * will be displayed to
indicate that no power reading is being performed at that time.
Selecting Autorange for this channel will prevent these symbols from
appearing.