414 Chapter 2
Performance Verification Tests
59. Comms Absolute Power Accuracy (Options BAC or BAH)
14.Set the 10 dB and 1 dB step attenuators to 0 dB.
15.Disconnect the cable from the analyzer input connector and connect
the cable to the adapter and power sensor as shown in Figure 2-77.
16.Adjust the signal generator AMPLITUDE for a power meter reading
of 0 dbm ± 0.2 dB. Record the power meter reading here:
Amptd0dBm = _______ dBm
17.Connect the equipment as shown in Figure 2-78.
18.Perform the following steps for each of the “Nominal Input
Amplitude” values listed in Table 2-119 and Table 2-120.
a. Set the 1 dB step attenuator as indicated.
b. Set the 10 dB step attenuator as indicated.
c. Set the analyzer reference level as indicated.
d. Set the analyzer input attenuation as indicated.
e. Set the analyzer resolution bandwidth as indicated.
f. Press Single and wait for the sweep to finish.
g. Press Peak Search (or Search). The marker can still make a valid
measurement, even though the signal may be slightly above the
reference level for the first nominal amplitude setting.
h. Record the marker (Mkr1) amplitude value as the Measured
Amplitude in Table 2-121 and Table 2-122.
i. Calculate the amplitude accuracy as follows:
A
mplitude Accuracy Measured Amplitude Amptd15dBm ActualTotalAtten– RefAtten0dB
+()–=
Amplitude Accuracy =
Measured Amplitude Amptd0dB ActualTotalAtten– RefAtten0dB
+
()
–
Table 2-119 cdmaOne Channel Power (Option BAC), Preamp Off, Input level
<−25 dBm
Nominal
Input
Amplitude
(dBm)
Reference
Level
(dBm)
Resolution
Bandwidth
(kHz)
Input
Attenuation
(dB)
1 dB Step
Attenuator
(dB)
10 dB Step
Attenuator
(dB)
Nominal
Source
Level
(dBm)
−45 −45 10 10 5 40 0
−45 −25 10 10 5 40 0
−55 −55 10 10 5 50 0
−55 −35 10 10 5 50 0
−70 −70 10 10 0 70 0
−70 −50 10 10 0 70 0