Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 67)

Wave Expert
WE-OM-E Rev A
65
Probe Attenuation
To Set Probe Attenuation
In some cases, external attenuation may be used in from of the channel input connector. The Probe
Atten control can be used to enter the amount of external attenuation so that the proper signal level
is indicated on the instrument.
1. In the menu bar, touch Vertical, then select a channel from the drop-down menu.
2. Touch
inside the Probe Atten. field. Touch a divide-by menu selection or touch Var
(variable). If you choose Var, type in a value using the pop-up numeric keypad.
Linear and (SinX)/X Interpolation
Wave Expert acquires a signal in equivalent time sampling mode, so the effective sampling rate is
very high. For example, a 10 Gb/s signal with 1024 samples/UI will have a sample spacing
equivalent to a 10 THz sampling rate. Normally, interpolation would never be needed. In some
cases when a lower number of samples per bit are acquired, interpolation is helpful to view the
signal. Selecting SinX interpolation adds 10 samples in between the acquired points using sinx/x
interpolation. The default, linear interpolation does not add any additional samples.
To Set Up Interpolation
1. Touch the button for the channel you want to set up, for example.
2. In the dialog area, touch inside the Interpolation data entry field under Pre-Processing.
"Pre-Processing" means before Math processing.
3. Touch inside the Interpolation data entry field. A pop-up menu appears offering Linear or
Sinx/x interpolation.
4. Touch the button for the type of interpolation you want.
Inverting Waveforms
Touch the Invert checkbox to invert the waveform for the selected channel.