Chapter 2 409
Performance Verification Tests
59. Comms Absolute Power Accuracy (Options BAC or BAH)
59. Comms Absolute Power Accuracy (Options
BAC or BAH)
This test measures the absolute amplitude of the ESA Series Spectrum
Analyzer at numerous input levels, attenuator settings, and log levels.
The test also measures the amplitude accuracy with the Preamp On
when Option 1DS is present. The measured performance, when added
to the absolute frequency response over a 20 to 30 °C temperature
range, yields the Comms Absolute Accuracy. The absolute frequency
response is tested separately. Refer to the Frequency Response
performance test.
The frequency response is not specified in the Cellular nor PCS bands;
therefore, the Comms Frequency Response test must be completed first.
The worksheet data will be used with the results of the Comms
Amplitude Accuracy at 50 MHz to yield to the Comms absolute
accuracy in the Cellular and PCS bands.
A sythesized signal generator and attenuators are used as the signal
source to the analyzer. A power meter is used to measure the signal
source (with the attenuators set to 0 dB). The value measured is
recorded as the source amplitude. 15 dBm as well as 0 dBm are the
source levels used.
The attenuators are used to adjust the signal levels applied to the
analyzer from the initial signal amplitude. The amplitude measured by
the analyzer is compared to the actual signal level and the amplitude
error is then calculated.
This test is repeated at different frequencies and amplitude signal
levels.
The related adjustment for this performance test is the “IF Amplitude
Adjustment.”
Equipment Required
Synthesized signal generator
10 dB step attenuator
1 dB step attenuator
Attenuator interconnection kit
Attenuator driver (if programmable step attenuators are used)
Power meter
Power sensor
Cable, Type-N, 62 cm (24 in.) (m) (2 required)
Cable, BNC
Adapter, Type-N (f) to Type-N (f)