Teledyne LeCroy PXD222 - Manual (Page 28)

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ISSUED: November 2001 PXD222-OM-E Rev A
PXD 222 Digitizer
Offset CH1 and CH2: Set the Offset for each input independently using the Offset knob or by typ-
ing a value in the Offset control box. The Offset knob will change color depending on the channel
selected: yellow when channel 1 is selected and red when channel 2 is selected. These colors
also match the trace colors in the graphics display.
Bandwidth Limit CH1 and CH2: To suppress high frequency noise on waveforms, you can limit
the bandwidth of the digitizer by selecting a 10 kHz or 20 MHz filter. This function smooths the dis-
played waveform by blocking frequencies above the filter’s limit.
Coupling CH1 and CH2: Each channel of the digitizer is set to DC coupled by default so that AC
and DC voltages appear on the display. Select AC coupling when you wish to observe a small sig-
nal that rides on a DC signal. Clicking the switch control toggles the selection.
T/Div: The time per division is set by using the T/Div knob or by typing a value in the T/Div control
box. The digitizer automatically adapts itself to use the maximum sampling rate whenever the
timebase is changed.
Delay: Turn the Delay knob to adjust the horizontal position and the amount of pre-trigger, as
desired.
Acquisition Type: In NORMAL type, each acquisition is a fixed number of points depending on
the timebase; and the time between points is the inverse of the sample rate. In Mn-Max type an
oversampling technique is used to detect peaks. This acquisition type is useful for detecting
glitches on slow timebase settings. See the Operation chapter for more information.
Number of Points: This is an indicator that displays the number of points in each acquisition. This
will vary automatically depending on the T/Div and Acquisition type.
Sample Rate: This is an indicator that displays the sample rate for each acquisition. This will vary
automatically depending on the T/Div and Acquisition type.