Section 7: Advanced Operation
104
Dual Channel Simultaneous
Measurements
The vb instrument can measure two channels simultaneously. Dual
channel measurements must be taken in measure mode (rather than
record mode) and then saved to an appropriate machine location.
Because the instrument has to buffer and manipulate twice the data,
some of the more memory intensive operations are not available.
The following restrictions apply:
• Number of spectral lines is reduced to 1600 (3200 for
vb3000)
• Number of samples (for time waveforms) is reduced to 4096
(8192 for vb3000)
The Ascent software identifies recordings by their location and
date/timestamp. If the date/timestamp of two recordings is identical
at the same location in the instrument, one is discarded. Therefore,
when recording the two channels you must store them at different
locations. This can be either a different point or different axes. It is
good practice to store the two channels in measurement locations
that reflect the position and direction in which the sensors were
placed when the measurement was taken.
• To select dual channel measuring, from the Main Menu
press
then press to display the Set Parameters
Menu.
• Press
twice to change the channel setting to CH1 &
CH2.
• Connect sensors to both channels then press
and take
the measurement as normal.
• To store the measurements, with the
spectrum/waveform/tachometer reading displayed press
to open a pop-up window containing the Record option.
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