User manual

134
CHAPTER 5 – View and Impose Single and Averaged Sweeps
WinLTP 2.10 has added the ability to temporarily view single sweeps and also more permanently impose
single sweeps and impose averages of sweeps on the on-going acquired sweeps. During online
acquisition, sweeps can be separately viewed and imposed on each of the Pulse and Train sweeps (P0,
P1, TO and T1). The simplest way of Viewing a single sweep is to click on an Analysis Graph data point
that was generated by that sweep, and that sweep will appear. This is particularly helpful when wanting
to view a sweep from an earlier part of the experiment.
If you are low-pass filtering during acquisition, the Viewed, Imposed and Averaged/Imposed Sweeps will
be filtered to the same value as the acquired sweeps allowing for direct comparisons. And changing the
low-pass filter value changes the values on not only the on-going acquired sweeps but all Viewed,
Imposed and Averaged Imposed sweeps for all the appropriate Pulse and Train sweeps (P0, P1, T0 and
T1).
It is important to realize that each of the Viewed and Imposed sweeps is loaded from the
previously saved ADsweep files, so in order to view and impose the sweeps you wish, you
have to have already saved them to disk.
The type of sweeps you wish to impose on the on-going acquired sweeps is set by the ‘Choose Filename
Extension’ pulldown menu (Fig. 5.1). This will usually be either Raw sweeps (with the *P0, *.P1, *.T0 or
*.T1 ADsweep file extension) or Averaged sweeps (with the *.AP0 etc file extension). Filtered or Blanked
and Filtered sweeps (with the *.FP0 etc extension) can also be imposed, but remember that the Raw or
Averaged sweeps can also be low-pass filtered at different amounts, so it probably better to impose the
Raw or Averaged sweeps and low-pass filter them. Averaged & Blanked sweeps (*.LP0 etc) and
Averaged & Filtered or Averaged, Blanked & Filtered sweeps (*.IP0 etc) can also be imposed.
If you choose the "Highest Raw / Blank, Filt, or Blank & Filt sweeps" (eg. the Highest Raw, Raw &
Blanked, Raw & Filtered, or Raw & Blanked & Filtered sweeps), you will get the current or previous *.FP0
files if present, if not then the *.BP0 files if present, and if not then *.P0 files if present.
If you choose the "Highest Averaged / Blank, Filt, or Blank & Filt sweeps" (eg the Highest Averaged,
Averaged & Blanked, Averaged & Filtered, or Averaged & Blanked & Filtered sweeps), you will get the
current or previous *.IP0 files if present, if not present then the *.LP0 files if present, and if not present
then the *.AP0 if present.
And if you choose the "Highest Avg or Raw / Blank, Filt, Blank & Filt sweeps" (eg the Highest Averaged,
Averaged & Blanked, Averaged & Filtered, Averaged, Blanked & Filtered, Raw, Raw & Blanked, Raw &
Filtered, Raw, Blanked & Filtered sweeps), you will get the current or previous files in the following
decending order: *.IP0, *.LP0, *.AP0, *.FP0, *.BP0 or *.P0. This is commonly used if you are saving both
Raw (*.P0 etc) and Averaged (*.AP0 etc) sweeps and wish to view and/or impose both types.
In the following example that shows how Viewed and Imposed sweeps are obtained and manipulated
(Sections 5.1, and 5.3 to 5.5), eight P0sweeps were acquired (with file numbers ‘0000’ to ‘0007’) with a 3
msec pulse starting at 10 msec delay (in ‘0000’) and incremented by 10 msec to an 80 msec delay (in
‘0007’). All the sweeps in Sections 5.1 and 5.3 to 5.4 (except Fig. 5.4.2) were low-pass filtered at 200 Hz.