Specifications

Frequency Response Adjustment
Two sources, and two sets of power sensors are used to provide the needed frequency
range.
To measure frequencies below 100 kHz, a DVM with a 50 ohm load replaces the power
sensor and a function generator is used as the source.
For improved amplitude accuracy below 3 GHz, the power splitter is characterized using a
specially-calibrated power sensor (the “reference” sensor) connected to one power splitter
output port. The other power splitter output port connects to the “buried” sensor; it is not
removed from the power splitter. Once the characterization is done, the reference sensor is
removed and replaced by the PSA.
Before testing frequencies >3 GHz, measurements are made at several frequencies in
bands 1 through 4, as applicable, to determine a target power level. The target power level
is the highest power level measured at the PSA that allows the synthesized sweeper output
to remain leveled. The ideal target power level is –10 dBm, but levels as low as –20 dBm
may be used.
Uncorrected flatness data is collected for each state. This is the raw frequency response
data.
The uncorrected flatness data is normalized to the 50 MHz reference measurement taken
in each state.
Further processing manipulates the uncorrected data so all states are measured relative to
the 10 dB input atten, preamp off, DC coupled reference.
The corrections are stored in the Front End Driver EEPROM as frequency/amplitude pairs
under unique File ID numbers.
The related performance test for this adjustment is “Frequency Response”.
Required Test Equipment
Test Equipment Model Number
E4440A
E4443A, E4445A
E4446A
E4448A
Synthesized Sweeper
83630A/B
83640A/B, 83650A/B
X
Synthesized Sweeper 83640A/B, 83650A/B X
Function Generator 33120A X X
Multimeter 3458A X X
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