10-18 Service Guide
Service Key Menus and Error Messages 8719ET/20ET/22ET
Service Menu - Service Features 8719ES/20ES/22ES
RF Network Analyzers
• (SM2H) (8719ET/ES and 8720ET/ES) allows
you to enter DAC numbers in the range of 2900 through 4095 to
generate test port output frequencies from 2.3 GHz to 4.9 GHz.
• (SM2H) (8722ET/ES) allows you to enter
DAC numbers in the range of 2020 through 4095 to generate test port
output frequencies from 18.2 GHz to 23.2 GHz.
• This controls the amplitude of the reference
oscillator.This DAC is located on the A59 source interface board.
• toggles the automatic leveling control (ALC) on and off.
(SM4) automatically attempts to determine new pretune values
when the instrument encounters phase lock problems (for
example, “harmonic skip”). With , the
frequencies and voltages do not change, as when they are
attempting to determine new pretune values, so
troubleshooting the phase-locked loop circuits is more
convenient. This function may also be turned off to avoid
pretune calibration errors in applications where there is a
limited frequency response in the R (reference) channel.
For example, in a high power test application, using band
limited filters for R channel phase locking.
(SM5) displays a phase lock sequence at the beginning of each
band. This sequence normally occurs very rapidly, making
it difficult to troubleshoot phase lock problems. Switching
this mode ON slows the process down, allowing you to
inspect the steps of the phase lock sequence (pretune,
acquire, and track) by pausing at each step. The steps are
indicated on the display, along with the channel (C1 or C2)
and band number (B1 through B13).
This mode can be used with PLL PAUSE to halt the
process at any step. It can also be used with the analog bus
counter.
is used only with PLL DIAG mode. indicates that
it will continuously cycle through all steps of the phase
lock sequence. holds it at any step of interest.
This mode is useful for troubleshooting phase-locked loop
problems.
accesses the Service Modes More menu.
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