Chapter 2 373
Performance Verification Tests
48. Tracking Generator Non-Harmonic Spurious Outputs: Agilent E4402B, E4403B, E4404B,
E4405B, E4407B, and E4408B (Option 1DN)
c. Multiply the fundamental frequency by the number calculated in
step b. Following the example, multiplying 10 MHz by 3 yields
30 MHz.
d. Calculate the difference between the marker frequency and the
frequency calculated in step c above. Continuing the example, the
difference would be 300 kHz.
e. Due to span accuracy uncertainties in the microwave analyzer,
the marker frequency might not equal the actual frequency. Given
the marker frequency, check if the difference calculated in step d
is within the appropriate tolerance:
For marker frequencies <5 MHz, tolerance = ±200 kHz
For marker frequencies <55 MHz, tolerance = ±750 kHz
For marker frequencies >55 MHz, tolerance = ±10 MHz
f. If the difference in step d is within the indicated tolerance, the
signal in question is the fundamental signal (if the number in
step b = 1) or a harmonic of the fundamental (if the number in
step b >1). This response should be ignored.
12.Verify that the marked signal is a true response and not a random
noise peak by pressing SINGLE to trigger a new sweep and press
PEAK SEARCH. A true response will remain at the same frequency
and amplitude on successive sweeps but a noise peak will not.
If the marked signal is not the fundamental or a harmonic of the
fundamental and is a true response, continue with step 14.
13.If the marked signal is either the fundamental or a harmonic of the
fundamental or a noise peak, move the marker on the microwave
analyzer to the next highest signal by pressing NEXT PEAK. Repeat
step 11 above.
Perform step 14 only if the marker signal is a true response and not
a fundamental or harmonic of the fundamental. Otherwise, continue
with step 15.
14.Calculate the difference between the amplitude of marked signal
and the fundamental amplitude as listed in Table 2-103.
For example, if the fundamental amplitude for a fundamental
frequency of 10 MHz is 1.2 dBm and the marker amplitude is
−40.8 dBm, the difference is −42 dBc.
Record this difference as the non-harmonic response amplitude for
the appropriate analyzer center frequency and microwave analyzer
start and stop frequency settings in Table 2-104.
15.If a true non-harmonic spurious response is not found, record
“NOISE” as the non-harmonic response Amplitude in Table 2-104 for
the appropriate analyzer center frequency and microwave analyzer