B&K Precision 2552-2559 - Manual - Manual (Page 17)

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Figure 8 - 3Vpp Square Wave
4. Press “CH1” two times to cancel the channel 1, Press“CH2” to
change screen into channel 2, reset the channel 2 as step 2 and step
3. Do the same for 4CH models by pressing “CH3” and “CH4”
for channel 3 and channel 4 respectively.
Probe Safety
A guard around the probe body provides a finger barrier for protection from
electric shock.
Figure 9 - Probe
Connect the probe to the oscilloscope and connect the ground terminal to
ground before you take any measurements.