HP 202A Operating And Service Manual page 25

Sect.
IV
Page 7
(A) Correct setting of
reference levels.
(B) Both Ref. levels too large.
(C) +Ref. too high and -Ref. too low. Frequency
correct but large 2nd harmonic a s seen by peak
flattening on one side and sharpening on other.
Also sine average not same a s triangle.
(D) References a r e correct but tri-
angle unbalanced. Frequency
correct but high second harmonic
component in phase with funda-
Triangle & Sine Ave. mental.
Figure 4-2.
Effect of Triangle Maladjustment on Distortion and Frequency.
Ten-Segment Approximations Used for Clarity.