Tektronix AFG3000 Series Service Manual page 76

Performance Verification
AFG3000 Series Performance Test Record
Total Harmonic Distortion (THD)
AFG3xxxx
Sine 20.0 kHz
CH1 reading (dBm)
reading - reference (A – A
n 1
Bn/20
C = 10
n
2
∑
C
n
THD
n 2
=
= ---------------------- -
C
1
CH2 reading (dBm)
reading - reference (An – A1) (dBc)
Bn/20
C = 10
n
2
∑
C
n
THD
n 2
=
= ---------------------- -
C
1
4-14
Spectrum Analyzer reading
Fundamental 2nd
= reference
20 kHz 40 kHz
A = A
1
) (dBc) B = 0 B
1
C = 1 C
1
A1= A2=
B1= 0 B2=
C1= 1 C2=
3rd 4th
60 kHz 80 kHz
= A = A =
2 3 4
= B = B =
2 3 4
= C = C =
2 3 4
A3= A4=
B3= B4=
C3= C4=
AFG3000 Series Arbitrary/Function Generators Service Manual
5th 6th 7th
100 kHz 120 kHz 140 kHz
A = A = A
5 6
B = B = B
5 6
C = C = C
5 6
Limit
< 0.2%
A5= A6= A7=
B5= B6= B7=
C5= C6= C7=
Limit
< 0.2%
=
7
=
7
=
7