Testing Performance 2
2000/3000 X-Series Oscilloscopes Service Guide 39
The ΔY value on the lower line of the display should be within the test limits of
Table 11 or Table 12 (depending on the oscilloscope model).
If a result is not within the test limits, go to the “Troubleshooting” chapter. Then
return here.
10 Disconnect the oscilloscope calibrator from the oscilloscope.
11 Repeat this procedure to check the dual cursor accuracy with the remaining
Volts/div setting values in Table 11 or Table 12 (depending on the oscilloscope
model).
12 Finally, repeat this procedure for the remaining channels to be tested.
Use a Blocking Capacitor to Reduce Noise
On the more sensitive ranges, such as 1mV/div, 2mV/div, and 5mV/div, noise
may be a factor. To eliminate the noise, add a BNC Tee, blocking capacitor, and
shorting cap at the oscilloscope channel input to shunt the noise to ground. See
Figure 6. If a BNC capacitor is not available, use an SMA blocking capacitor,
adapter, and cap. See “Blocking capacitor and shorting cap in the equipment list
on page 22 for details.
Figure 6 Using a Blocking Capacitor to Reduce Noise
To oscilloscope input
BNC shorting
cap
Blocking
Capacitor
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