Promax OD-405, Manual, Page: 183 / 218

USER’S MANUAL. OD-405/410B/411/415
Page 67 11-2011
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5.6.7 Limiting the waveform bandwidth
Bandwidth limitation puts the input signal into a 20 MHz (-3dB) low-pass-
filter. This function is useful of cutting off high frequency noise to see the clear
waveform shape.
1. Press the CH1 or CH2 key.
2. Press BW Limit to turn on or off the limitation. When turned on, the
BW indicator appears next to the Channel indicator in the display.
Example:
BW Limit Off BW Limit On
Figure 25.-
5.6.8 Selecting the probe attenuation level (OD-405/OD-410B)
A signal probe has an attenuation switch to lower the original DUT signal
level to the oscilloscope input range, if necessary. The probe attenuation
selection adjusts the vertical scale so that the voltage level on the display
reflects the real value, not the attenuated level.
1. Press the CH1 or CH2 key.
2. Press Probe repeatedly to select the attenuation level.
3. The voltage scale in the channel indicator changes accordingly.
There is no change in the waveform shape.
x1, x10, x100
The attenuation factor adds no influence on the real signal; it only
changes the voltage scale on the display.