Teledyne LeCroy WaveExpert 100H Operators Manual User Manual

Page 68

Operator’s Manual

WE-OM-E Rev A

QuickZoom

QuickZoom automatically displays a zoom of the channel or trace on a new grid.

To Turn On a Zoom

Touch the Zoom button

in the channel dialog.

Finding Scale

You can access the Find Scale button from the channel setup dialog. This feature automatically
calculates peak-to-peak voltage, and chooses an appropriate Volts/Div scale to fully display the
waveform.

To Use Find Scale

1. Touch the trace label for the waveform you desire.
2. Touch

the

Find Scale icon.

Variable Gain

Variable Gain lets you change the granularity with which the gain is incremented. For example,
when Variable Gain is disabled, the gain will increase or decrease in preset increments of 10 or
100 mV each time you touch the Up/Down buttons.

However, when Variable Gain is enabled, you can increase or decrease the gain in increments as
small as 1 mV, depending on the scale of the waveform.

To Enable Variable Gain

1. Touch the descriptor label for the waveform whose gain you want to vary.
2. Touch

the Variable Gain check box.

Channel Deskew

Unlike the Deskew math function, channel Deskew does no resampling, but instead adjusts the
horizontal offset by the amount that you enter. The valid range is dependent on the current
timebase +/- 9 divisions.

To Set Up Channel Deskew

1. In the menu bar, touch Vertical; from the drop-down menu, select a channel to set up.
2. Touch inside the Deskew data entry field and enter a value using the pop-up numeric

keypad.

Dark Calibration

The Dark Cal Level is the residual power measured by the optical head with no input applied (dark
input), and is used only by the extinction ratio measurement. The dark calibration is independent of
what type of module is connected to the selected channel, so an external optical-to-electrical
converter can be compensated.

To perform dark calibration