HP E1340A Service Manual page 39

Chapter 2
9. Set the power meter expected frequency to the crossover frequency
(100 kHz). Measure the AFG output power and convert the reading
to volts. Record the reading in Table 2-4.
Reading (volts) =( √  
10. Calculate the correction factor that will be used to reference the
power meter to the DMM. Record the correction factor in Table 2-4.
Correction Factor =
Repeat 11 - 14 for each frequency in Table 2-4:
11. Set the AFG output to the frequency specified in Table 2-4:
ABORT
FREQ <frequency>
INIT:IMM
where <frequency> is the value specified in Table 2-4.
12. Set the power meter expected frequency to the AFG output frequency.
13. Measure the output power with the power meter, convert the reading
to volts, and multiply by the correction factor. Record the results in
Table 2-4.
Reading (volts) =( √  
Corrected Reading (volts) = Reading (volts ) × C.F. ( step 10)
14. Convert the reading to dBm. Calculate and record the error relative
to the reference level calculated in step 4. Record the results in
Table 2-4. Record the final result in Table 2-7.
Reading (dBm) = 20 × log Corrected Reading (volts) + 13.0103
Error (dB) = Reading ( dBm) − Reference Level (dBm )
Reading (watts )
× 50
 
DMM reading at 100 kHz (step 6)
Power Meter reading at 100 kHz (step 9)
Set frequency
Initiate waveform
Reading (watts) × 50
 
Verification Tests 41
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