HP 8530A, Руководство по эксплуатации и программированию, Страница: 322 / 439

Controlling Multiple Sources
SOURCE 1 F ormula Use
The SOURCE 1 formula could compensate for any frequency translation occurring in the RF
portion of the system. An example would be a frequency multiplier that cannot communicate
digitally with the RF source . HP multipliers and most RF sources have an interconnect bus that
allows them to communicate directly . When using these devices you do not need to change the
SOURCE 1 formula from the default settings . However , if you have a source or multiplier that
does not have the interconnect, then change the SOURCE 1 formula as needed:
F or example , for a 3x multiplier you would enter 1/3 as the multiplier (and no oset). Assume
you are using this type of setup , and you request an RF frequency of 45 GHz. The receiver
will divide that value by 3 and program the RF source for the new value (15 GHz). The RF
source outputs 15 GHz, which is then multiplied (by 3) by the RF multiplier . The multiplier
then outputs the desired 45 GHz signal.
RECEIVER F ormula Use
All the examples above assume that a 20 MHz IF frequency is available from the frequency
converter . These examples are very useful if you are testing discrete antennas . However , some
users may need to test modules which contain mixers , and which may not a produce 20 MHz IF
output.
Figure 17-9 shows an example setup .
Figure 17-9. Module T esting Example
Note that the Module Under T est contains a 10th harmonic mixer . Also , the module only
produces a 1 GHz IF signal. In this example you must modify the SOURCE 2 and RECEIVER
formulas as follows:
SOURCE 2
Using System Functions 17-15