48
Agilent L4532A/ 34A Service Guide
4
Calibration and Adjustment
Test Considerations
Er r or s may be in d u ced by ac sign als p r esen t on t he inp u t lead s du r in g a
self test. Lon g test leads can also act as an an ten n a cau sin g p ick u p of
ac sign als.
For op timum p er for man ce, all pr oced u r es sh ou ld comp ly wit h t he
followin g r ecommen dation s:
Assu r e t hat th e calibr ation ambien t temper atu r e (T
cal
) is st able an d
between 18 C an d 28 C. Id eally th e calibr ation shou ld be p er for med
at 23 C.
Assu r e ambien t r elative hu mid ity is less than 95%.
Allow a 60 min u t e war m up p er iod.
Keep t he inp u t cables as shor t as p ossible.
Con n ect t he inpu t cable shield s t o ear t h grou n d . Excep t wher e n oted
in t he p r ocedu r es, con n ect t he calibr ator LO sou rce t o ear t h grou n d at
t he calibr at or. It is imp or t an t t hat th e LO to ear t h grou n d con n ection
be made at on ly on e p lace in t he circuit to avoid gr ou n d loop s.
You mu st t ake car e t o en su r e t hat th e calibr ation st an d ar ds an d t est
p rocedu r es u sed do n ot in trod uce ad dition al er ror s. Ideally, t he st an d ar d s
u sed t o ver ify an d ad ju st th e d igitizer sh ou ld be an or d er of magn itu d e
mor e accu r at e th an each d igitizer r an ge fu ll scale er r or sp ecification .
