LeCroy WaveSurfer 400 Series Service Manual page 61

4) Press Clear Sweeps
5) After 100 sweeps, Read off the DSO Mean parameter voltage, and record the
measurement in Table 7, column Mean.
Repeat the test for the other channels, substituting channel controls and input
connector. Record the measurements in Table 7.
Calculate the Difference ( ∆ ) by subtracting the DMM voltage reading from the
DSO mean voltage reading.
Record the test result in Table 7, and compare the Difference ( ∆ ) to the
corresponding limit in the test record.
Rev. D Sept 2007 Performance Verification 5-21