University of Portland - p. 9 of 9 - Oscilloscope - TDS3012B.docx
Automated Measurements
The oscilloscope can also measure various values automatically. To activate one or more of
these measurements, press the Measure button, Select Measrmnt, and then the button next to the
desired measurement. To see the full list of automated measurements, click on the More button.
To turn a measurement off, press the Measure button, Remove Measrmnt, and then Measurement
1 button (or the button for the measurement you wish to remove).
Depending on the vertical and horizontal scale settings, the automated measurements are not
always accurate, so it is good practice to double-check these measurements by multiplying the
number of divisions by the scale or by using the using the cursors.
Displaying Two Signals Simultaneously
The oscilloscope can display two signals at the same time. To add a second signal, connect a
10X probe to the CH 2 input and connect it to the signal that you want to display. Press the blue
CH 2 button to turn on the channel 2 trace on the oscilloscope display. Pressing the CH 2 button
also causes the Vertical Scale and Position knobs to control the channel 2 trace on the screen
instead of the channel 1 trace. If you want to adjust the vertical scale or position of Channel 1,
you first switch back to Channel 1 by pressing the CH 1 button, and then turn the Vertical Scale
or Position knob. The horizontal scale is always the same for both channels and can be adjusted
when either channel is active. You can turn one of the channels off by pressing the CH 1 or CH
2 button and then pressing the OFF button.
Probe Setup
There is a connection on most (but not all) 10X probes that tells the oscilloscope that a 10X
probe is connected. Since the 10X probe divides the input signal by 10X, if the oscilloscope
detects a 10X probe is connected, it will multiply the signal by 10 times to compensate. If the
Probe Comp signal (see Figure 1) does not appear to be a square wave from 0 to 5 Volts, check
to see if the oscilloscope has detected the 10X probe correctly by pressing the Vertical Menu
button, and then press the Probe Setup button. The value should be 10X if a 10X probe is
connected to the input (and 1X if a coax cable is connected).
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