HP 8562E Service Manual page 229

TAM (Test and Adjustment Module)
When attached to the spectrum analyzer rear panel, the HP 85629B test and adjustment
module (TAM), in conjunction with the HP 8562E/TAM Interface Software, provides
diagnostic functions for supporting the HP 85623 spectrum analyzer. Because the TAM is
connected directly to the spectrum analyzer internal data and address bus, it controls the
spectrum analyzer hardware directly through firmware control. It would be impossible to
control the hardware to the same extent either from the spectrum analyzer front panel or over
the HP-IB.
The TAM by itself will not support the HP 85623; it will not recognize model number
the HP 85623 is common to other HP 8560 E-Series analyzers which are recognized by the
TAM. The HP 8562E/TAM Interface Software enables use of the TAM with the HP 85623
by modifying the spectrum analyzer "ID String" (the model number and option information
stored in EEROM) to include a recognized model number (HP 85603, HP 85613, or
HP 85633). The model number chosen depends upon which TAM function is desired.
Once the model number is changed to one of the recognized model numbers, the selected
TAM function can be run as it normally would on the recognized model number spectrum
analyzer. Some TAM functions have limitations when used on an HP 85623. These limitations
are noted on the computer display.
The TAM measures voltages at key points in the circuitry and flags a failure whenever the
voltage falls outside the limits. The TAM locates the failure to a small functional area which
can be examined manually. Remember the following when using the TAM:
n Be sure the spectrum analyzer power is turned off when installing or removing the TAM.
n Use the HELP softkey (found in all menus) for useful information.
n Press [MODULE) to return to the TAM main menu.
n The TAM acts as the active controller on the HP-IB bus. Press the PASS CCLNTRK softkey
on the computer keyboard to remove the computer as the active controller.
The TAM I/F SW requires an HP 9000, Series 200 or Series 300 controller and an HP BASIC
operating system as described in the instructions for using the Frequency Response
Adjustment Software in Chapter 3, "Frequency Response Adjustment Software." The TAM
I/F SW requires 500 kilobytes of free memory after the operating system is loaded.
Loading the software
n Connect an HP-IB cable from the controller HP-IB port to the HP-IB port on the
HP 85623. Turn the HP 85623 power on.
The WR PROT/WR ENA jumper on the A2 Controller board should be
set to the WR ENA position. Moving this jumper requires removal of the
instrument cover.
n Insert the disk into a convenient flexible disk drive.
7-10 General Troubleshooting