Frequency response (aka. Flatness) is defined as the amplitude deviation from the reference amplitude at 50 MHz. The complete EMI receiver frequency response is measured with several tests. The model and options of the DUT will determine which tests are run from the list below:
This test measures frequency response Preamp On/Off in both RF Preselector On/Off mode. The EMI receiver has a second RF input, so the test will be repeated for RF Input 2.
The E9304A Option H18 power sensor is used in this test because the Preselector On, Preamp On Flatness is specified down to 9 kHz. The Preamplifier requires very low levels (–35 dBm). The E9304A can measure these low levels at 9 kHz. A function generator is used as the source below 50 MHz.
A “buried power sensor” technique is used to characterize the tracking error of a power splitter in order to avoid the relatively large specified tracking error. This technique reduces the measurement uncertainty to verify the frequency response specification for the 9 kHz to 50 MHz range. The buried sensor calibration is valid for four hours.
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|
Test Equipment |
Model Number1 |
|---|---|
|
Function Generator |
33622A |
|
Power Meter |
N1914A |
|
RF Power Sensor
|
E9304A Option H18 |
|
RF Power Splitter |
11667A |
|
Cable, BNC
|
8120-1840 |
|
Adapter, Type-N (m) to BNC (f) |
1250-1476 |
|
Adapter, Type-N (m) to Type-N (m) |
1250-1475 |
|
Adapter, Type-N (m) to 3.5 mm (f)
|
1250-1744 |
|
Adapter, Type-N (m) to 2.4 mm (f)
|
11903D |
|
