Teledyne LeCroy WaveLink Differential Probe Series (8-13 GHz) - Manual (Page 67)

Operator's Manual
The common mode frequency in these graphs is assumed to be sinusoidal. In real life applications,
the common mode signal is seldom a pure sine wave. Signals with pulse wave shapes contain
frequency components much higher than the repetition rate may suggest. This makes it very
difficult to predict actual performance in the application for CMRR-versus-frequency graphs. The
practical application of these graphs is to compare the relative common mode rejection
performance between different probes and amplifiers.
Offset
The offset for the WaveLink probe is in the probe amplifier (D830, D1030, and D1330). Thus, these
probes have full offset capability over their entire V/Div range.
When the WaveLink series probe is used with a Teledyne LeCroy WaveMaster 8 Zi / Zi-A or similar
oscilloscope equipped with ProLink or 2.92mm interface, the probe offset is controlled with the
channel OFFSET knob.
Sometimes it may be desirable to display a waveform as a reference signal where a large display
amplitude may not be necessary. Perhaps a timing reference when amplitude details are not
needed. In such a case, the oscilloscope's zoom function can be used to reduce the displayed
height of the reference signal. (Refer to your oscilloscope's online help for operation of the zoom
function.)
Dynamic Range
WaveLinkMedium Bandwidth probe amplifiers have no gain or attenuation controls. However, WL-
PLINK does provide gain and attenuation controls.
The actual gain value for each probe is indicated in the probe dialog box, which is displayed when
the probe is connected to the scope.
The WaveLink series probes are always DC coupled (no AC coupling is provided). Therefore, care
must be exercised to avoid exceeding the common mode range. Because the common mode signal
is rejected by the probe and is not displayed, changes in the amplitude of the common mode
component are not apparent to the user. Exceeding the common mode range may introduce
distortion to the probe's output signal.
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