Testing Performance 2
6000 X-Series Oscilloscopes Service Guide 33
The difference in average voltage readings should be within the test limits of
Table 8 (depending on the oscilloscope model).
If a result is not within the test limits, go to the “Troubleshooting” chapter. Then
return here.
11 Disconnect the precision source from the oscilloscope.
12 Repeat this procedure to check the DC vertical gain accuracy with the
remaining Volts/div setting values in Table 8 (depending on the oscilloscope
model).
13 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 1 mV/div, 2 mV/div, and 5 mV/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 4. If a BNC capacitor is not available, use an SMA blocking capacitor,
adapter, and cap. See “Blocking capacitor in the equipment list on page 19 for
details.
Figure 4 Using a Blocking Capacitor to Reduce Noise
To oscilloscope input
BNC shorting
cap
Blocking
Capacitor
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