Acquiring and Displaying Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–19
Bandwidth. Bandwidth refers to the range of frequencies that an oscilloscope can
acquire and display accurately (that is, with less than 3 dB attenuation). If you
limit the upper limit for the higher frequency components by selecting 250 MHz
or 20 MHz, a
B
W
symbol will appear in the lower part of the display. To change
the bandwidth of the selected channel:
Press VERTICAL MENU ➞ Bandwidth (main) ➞ Full, 250 MHz, or
20 MHz (side).
Fine Scale. To make fine adjustments to the vertical scale, press VERTICAL
MENU ➞ Fine Scale (main) and use the general purpose knob or the keypad.
Position. To adjust the vertical position to a specific number of divisions, press
VERTICAL MENU ➞ Position (main) and use the general purpose knob or the
keypad to set the offset value. Press Set to 0 divs (side) if you want to reset the
reference point of the selected waveform to the center of the display.
Offset. Use offset to subtract DC bias before examining a waveform. For example,
you might want to display a small ripple (for example, 100 mV of ripple) on a
power supply output (for example, a +5 V output). Adjust offset to keep the ripple
on screen while setting the vertical scale sensitive enough to best display the ripple.
To adjust offset, press VERTICAL MENU ➞ Offset (main). Then use the
general purpose knob or keypad to set the vertical offset. Press Set to 0 V (side)
if you want to reset the offset to zero.
You can set an external attenuation (or gain) in addition to the attenuation
specified by the probe.
To set external attenuation, press VERTICAL MENU ➞ Probe Func-
tions (main) ➞ External Attenuation or External Attenuation in dB (side).
External Attenuation — Use the general purpose knob or the keypad to set the
external attenuation as a multiplier.
External Attenuation in dB — Use the general purpose knob or the keypad to
set the external attenuation in dB.
To Set External
Attenuation (TDS 500D
and TDS 700D Only)
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