B+K precision 5490C Series, User Manual

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Step 3: Range adjustment
Use the softkeys to select the range. Auto range (Auto) can automatically select the appropriate range
for measurement based on the input signal. The auto range is adjusted upwards to 110% of the
existing range and down to 10% of the existing range.
Step 4: AC Filter Selection
The instrument offers three filter options of 3Hz, 20Hz and 200Hz. The filter you choose should be the
highest filter which is less than the frequency of your test signal. For example, if the input signal is
300Hz, the stable data can be obtained using the 200 Hz filter.
Step 5: Speed selection
Filter Slow Medium Fast
3Hz √ ﹣ ﹣
20Hz √ √ ﹣
200Hz √ √ √
Different filters have different test speeds, so choosing the right measurement speed based on the
filter can result in more accurate test results or faster test speeds.