Operation; Self Check; Error Messages; Introduction - HP 4935A Operating And Service Manual

Transmission impairment measuring set
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INTRODUCTION

3-1.
This section contains information on front and re jr panel features, self check procedures, and error
Also covered are the principles of operation for all measurements. If any of the automatic
fail acceptable
3-3.

SELF CHECK

self check procedures are performed automatically at power-up by the instrument. Most of the
major circuits are checked and any problems are identified. Self check does not verif.y performance
specifications. I'rrformance
instrument to pass any self check procedure indicate? a malfunction that can possibly affect other
3-5.

ERROR MESSAGES

W hthn
the 4!4:ki,A
through thr filters. The
signal is checked after each filter, to verify that it is within acceptable limits. Errors
0 through 6 indicate there are problems during self check. Errors 7 and 8 highlight problems during a
measurement. Other indications of errors during measurement are described by the particular
After
startup
if error messages occur, the instrument continues to operate correctly except for those
affected hy the displayed errors. Errors 0 t Trough 5 (Err O-Err 5) followed by Error 6 (Err 6) is
of a system level failure more than a filter failure.
0
2
4
5
Err 0.
Error in I,EVEI2
7
IMPULSE NOISE threshold is sct1
SECTION III

OPERATION

limits as specified in the checks, then adjustment or repair may be
checks verify that the instrument meets published specifications. Failure of the
is powered up, the instrument automatically transmits a signal into its receiver
self-check,
the
instrument
he measured thrc.+$ 50 kHit filter.
1004 11~ tone is below -16 dBm or above +13 dBm in NOISE: WITH
automatically
goes
into
Transmit
filter.
signal path.
too high. Thr upper limit varies with the
116 dHrn lippclr Limit
107 d Hrn
Operation
Mode,

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