Agilent Technologies E1401-90493 - page 147

Chapter 2 147
Performance Verification Tests
19. Overall Absolute Amplitude Accuracy: Agilent E4401B and E4411B
test record as indicated in Table 2-30.
Measuring –20 dBm Reference Level
1. Press AMPLITUDE, Ref Level, –20 dBm.
2. Copy the actual total attenuation values from Table 2-30 into the
actual total attenuation column in Table 2-31. Not all values in
Table 2-30 will be required in Table 2-31.
3. Perform the following steps for each of the nominal amplitude values
listed in Table 2-31:
a. Set the 1 dB step attenuator as indicated in Table 2-31.
b. Set the 10 dB step attenuator as indicated in Table 2-31.
c. Press Single and wait for the sweep to finish.
d. Press Peak Search (or Search). Even though the signal may be
slightly above the reference level for the first nominal amplitude
setting, the marker can still make a valid measurement.
e. Record the marker (Mkr1) amplitude value as the measured
amplitude in Table 2-31.
f. Calculate the amplitude accuracy as follows:
g. Record the amplitude accuracy in the performance verification
test record as indicated in Table 2-31.
Measuring –40 dBm Reference Level
1. Press AMPLITUDE, Ref Level, –40 dBm.
2. Copy the actual total attenuation values from Table 2-31 into the
actual total attenuation column in Table 2-32. Not all values in Table
2-31 will be required in Table 2-32.
Table 2-31 Amplitude Accuracy Worksheet, –20 dBm Reference Level
1 dB Step
Attenuator
10 dB Step
Attenuator Total Attenuation
Nominal
Amplitude
Measured
Amplitude
Amplitude
Accuracy
Test
Record
Entry
Setting Actual Setting Actual
0 dB 20 dB 20 dB –20 dBm 7)
0 dB 30 dB 30 dB –30 dBm 8)
0 dB 40 dB 40 dB –40 dBm 9)
0 dB 50 dB 50 dB –50 dBm 10)
Amplitude Accuracy Measured Amplitude Amptd0dBm ActualTotalAtten RefAtten0dB +–()–=