HP 70908A, Руководство по обслуживанию

Страница: 249 / 335

T est 20. Diagnostics
7074 Discriminator unlocked
The DUT setup is 1L0 band, 4 GHz center frequency . The DUT rst switches from the
1L0 band to the 1H0 band and then from 1H0 band to the 1L0 band. The detector
must rst indicate discriminator loop unlock and then discriminator loop lock.
7078 Tune Span error
The 7078 error occurs when TUNE SP AN voltage is low or missing.
The Tune Span cable from the LO module is rst connected and then disconnected.
The detector must rst indicate that the Tune + Span voltage is present and then
missing.
7003 2nd LO unlocked
The 7003 error occurs when 300 MHz IN signal to the 2nd converter PLL is low or
missing. This causes 2nd LO loop unlock.
The synthesized source connects to 300 MHz IN and rst provides 300 MHz, 0 dBm ,
and then 300 MHz, 050 dBm. The detector must rst indicate 2nd LO loop lock and
then 2nd LO loop unlocked.
8-44 Module V erication T ests