HP 87114B, Service Manual

Page: 124 / 174

Service Utilities Menu
This menu allows manual control of several sections of the A4 source and A5 receiver
assemblies . This can be a helpful tool in troubleshooting these circuits .
Caution
Most of these utilities are for factory use only. Modication of any values or
settings can result in improper operation or inaccurate results. If in doubt
as to the status of any settings , simply cycle the analyzer's line power . These
settings will then be defaulted to the correct values .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Meas Cal Options : Goes to the Measurement Calibration Options menu. From this menu
you can activate/deactivate the measurement calibrations and detector calibrations , as well as
access the View Array Master and View Array Interpolate menus (described in detail later).
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Analog Bus : Goes to the Analog Bus menu.
NNNNNNNNNNNNNNNNNNNNNNN
IF Gain : FOR F A CTORY USE ONL Y .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Adj Test Results : Results of several adjustments can viewed by selecting
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Adj Tests Results . While this information is designed for factory use and can vary
considerably from unit to unit, the date and time that the last adjustment was done or modied
can be helpful information. This is updated each time an adjustment is performed. However ,
this date will be lost if the correction constants are not stored to EEPROM before power is
cycled. Date format is as dened under the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Set Clock menu.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Select Array ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Display Array : These two selections are virtually identical and both display
the same data. Information displayed is the stored correction for the indicated parameter .
Assuming no adjustments have been performed since power was cycled, this represents the
correction constants stored in EEPROM.
Viewing this data is useful in determining the measured raw performance of the analyzer , as
well as the quality of the adjustment procedure used to store the correction constant data.
Since this data represents the correction constants determined by performing the adjustments ,
it is also an indication of how the adjustments were performed. If any of these arrays show
signicant discontinuities , suspect either a hardware problem in the analyzer , or a hardware
problem in the equipment used to perform the adjustment.
Data displayed is always the full band correction regardless of the current start/stop
frequency settings . Absolute values are generally oset by a signicant amount, so meaningful
information can only be derived from the relative values . T able 5-3 lists all of the analyzer's
thirty-nine correction arrays along with a brief description and typical value ranges .
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
More Svc Utilities : Allows you to manually control the ALC D A C, step attenuator , LO
power , and the autozero D A Cs for the R* and B* inputs .
5-8 Service Related Menus