94 Chapter2
Adjustment Procedures
9. Tracking Generator Power Level Adjustments (Option 002)
9. Tracking Generator Power Level
Adjustments (Option 002)
Assembly Adjusted
A10 tracking generator assembly
Related Performance Test
Absolute Amplitude and Vernier Accuracy
Description
The A10 tracking generator has two adjustments for setting the output
power. A10R13 −10 dB ADJ sets the power level when the TRK GEN
RF POWER is set to −10 dBm and A10R18 0 dB ADJ sets the power
level when the TRK GEN RF POWER is set to 0 dBm. The −10 dB ADJ
acts as an offset adjustment while 0 dB ADJ acts as a gain adjustment.
These adjustments are set in the factory for a 10 dB difference in
output power between the −10 dBm and 0 dBm TRK GEN RF POWER
settings. When installing a replacement tracking generator, it should
only be necessary to adjust −10 dB ADJ (the offset adjustment) to
account for variations in cable loss from the tracking generator to the
RF OUT 50Ω connector. This adjustment is done at a 0 dBm TRK GEN
RF POWER setting. This ensures that the absolute power level with a 0
dBm TRK GEN RF POWER setting is 0 dBm with little effect, if any, on
the vernier accuracy.
In some cases, the power level at the −10 dBm TRK GEN RF POWER
setting might be out of tolerance. In such cases, the −10 dB ADJ is set
at a TRK GEN RF POWER of −10 dBm and the 0 dB ADJ is set at a
TRK GEN RF POWER of 0 dBm. These two adjustments must be
iterated until the power level at the two settings are within the given
tolerance.
Equipment
Measuring receiver ................... .......................................HP8902A
Power sensor .....................................................................HP8482A
Cable
Type N, 62 cm (24 in)................................................ HP 11500B/C
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