HP E1340A Service Manual page 48

Function generator
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Test Procedure
50 Verification Tests
1. Reset the AFG:
*RST;*CLS
Perform steps 2 - 6 for each frequency listed in Table 2-5:
2. Set the AFG to output a sinewave
<amplitude>
VOLT
where <amplitude> is the value specified in Table 2-5.
3. Set the AFG output frequency:
ABORT
<frequency>
FREQ
INIT:IMM
where <frequency> is the value specified in Table 2-5.
4. Set the spectrum analyzer center frequency to the output frequency of
the AFG. Measure the peak amplitude of the fundamental in dBm.
Record the reading in Table 2-5.
5. Set the spectrum analyzer center frequency to the second harmonic
( 2 × fundamental frequency ). Measure the peak amplitude of the
second harmonic. Repeat for third through fifth harmonics. Record
the amplitude of each harmonic in Table 2-5.
6. Calculate total harmonic distortion as shown below. Record the
results in Table 2-5. Record the final result in Table 2-7.
thd ( dBc) = 20 ⋅ log 
where
[ (n
(volts ) = 10
result
n
Reset AFG and clear status registers
DBM
Set frequency
Initiate waveform
√   
2
2
+ result
+ result
result
2
3
th
Harmonic (dBm) − Fundamental (dBm)
2
2
+ result
4
5
)
]
/20
Chapter 2

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