Amplitude Display Units - Commtest Instruments vbBalancer Instrument Reference Manual

With the spectrum measurement displayed on-screen (either
•
still measuring or stopped) and highlighted press
Y Axis Log to set the Y axis (amplitude) scaling options.
Press
•
Linear, Log, and dB scaling (vdB and adB scaling are only
available
respectively).
Press
•
that will be displayed on-screen. Use the arrow keys to
highlight a value then press
Press
•
range. This selects the lowest amplitude value that will be
displayed on-screen relative to your chosen Max Value.
When you have finished press
•
measurement screen.
Fixed Y Axis scale options
Setting a Max dB Value sets the highest value that the amplitude
axis can display, so if a peak goes above this value while you are
measuring you will not see the top of the peak. When using Linear
scaling you have two extra display options.
Automatic: This allows the instrument to auto-scale the left axis to
accommodate the highest and lowest peaks.
Current: This fixes the Y axis to whatever amplitude is currently
displaying, regardless of how large or small the peaks become.

Amplitude Display Units

Your chosen Store Units (acceleration, velocity etc) determine which
amplitude scaling options are available. The vdB scale is only
available if you are taking velocity measurements and adB is only
available if you are taking acceleration measurements. Linear and
Log scaling are available for all measurement types. Choose from
the following amplitude display units:
68 Section 6: Analyzing Measurements Onsite
Linear Log dB repeatedly to toggle between
when measuring
Y Axis Max. This is the highest amplitude value
Y Axis Range repeatedly to toggle the Y Axis
velocity and
to select.
to return to the
then
acceleration