Tektronix AFG3000 Series - Page 76

Performance Verification
4-14 AFG3000 Series Arbitrary/Function Generators Service Manual
AFG3000 Series Performance Test Record
Total Harmonic Distortion (THD)
AFG3xxxx Spectrum Analyzer reading
Fundamental
= reference
2nd 3rd 4th 5th 6th 7th
Sine 20.0 kHz 20 kHz 40 kHz 60 kHz 80 kHz 100 kHz 120 kHz 140 kHz
CH1 reading (dBm) A
1
= A
2
=A
3
=A
4
=A
5
=A
6
=A
7
=
reading - reference (A
n
– A
1
) (dBc) B
1
= 0 B
2
=B
3
=B
4
=B
5
=B
6
=B
7
=
C
n
= 10
Bn/20
C
1
= 1 C
2
=C
3
=C
4
=C
5
=C
6
=C
7
=
Limit
< 0.2%
CH2 reading (dBm) A1= A2= A3= A4= A5= A6= A7=
reading - reference (An – A1) (dBc) B1= 0 B2= B3= B4= B5= B6= B7=
C
n
= 10
Bn/20
C1= 1 C2= C3= C4= C5= C6= C7=
Limit
< 0.2%
THD
C
n
2
n2=
∑
C
1
-----------------------=
THD
C
n
2
n2=
∑
C
1
-----------------------=