Taking Measurements
TDS 310, TDS 320 & TDS 350 Instruction Manual
335
7. Press TOGGLE.
8. Use the General Purpose Knob to set the other cursor to the right edge
of the gate. All automated measurements now take data only from the
portion of the waveform that is within the gate.
9. Press Gate Off to turn gating off.
NOTE
Gate Off deactivates the gating function, but it does not deactivate
the vertical cursors. Deactivate the cursors from the cursor menu as
described in the next section.
SwitchHighLow Setup
Press the main menu button High-Low Setup
to change the way the measurement system determines the high and low
levels of waveforms. Use the side menu to select from these options.
H Press Histogram to set the levels statistically. The oscilloscope attempts
to find the highest density of points above and below the midpoint,
ignoring spikes. This method works well for measuring square waves and
pulse waveforms.
H Press Min-Max to set the levels to the lowest amplitude (most negative)
and highest amplitude (most positive) samples.
Set Reference Levels
Press the main menu button Reference Levels to
set the high, middle, and low reference levels. The oscilloscope uses these
levels for rise time, fall time, width, and overshoot measurements. Use the
side menu to select from these options.
H Press Set Levels in to toggle the units of the reference levels. Switch
between volts and percent.
H Press HighRef, Mid Ref,or Low Ref to select a particular reference
level. Use the General Purpose Knob to alter the selected reference
level. The defaults are 90%, 50%, and 10%, respectively.
You can also take quantitative measurements of a waveform with the cursor
system. To take measurements with cursors, follow this procedure.
1. Press the front panelbutton CURSOR, shown in Figure 319. The CUR
SOR button calls up the cursor menu, shown in Figure 320.
Taking
Measurements with
Cursors
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