HP 16500B User Reference page 89

The PORT O UT si gnal i s a posi t i ve- goi ng TTL pul se w hose w i dt h var i es
dependi ng on t he m odul e t hat i s dr i vi ng i t . The por t m ay be t er m i nat ed by a
50 Ω l oad t o r educe r i ngi ng, how ever , t he si gnal w i l l t hen be l ess t han or
equal t o 0. 4 V w hen l ow and at l east 2. 0 V w hen hi gh.
PO R T IN
W i t h a t r i gger si gnal connect ed t o t he PO RT I N BNC on t he r ear panel , t he
i nt er m odul e m easur em ent can be st ar t ed w i t h t hi s si gnal af t er pr eset vol t age
and edge cr i t er i a i s m et . To conf i gur e a PORT I N si gnal , do t he f ol l ow i ng:
Sel ect t he PORT IN Level
1
def i ned l evel bet w een +5 V and −4 V.
Sel ect t he PORT IN Edge
2
or Fal l i ng.
Af t er t he PO RT I N vol t age l evel and edge cr i t er i a i s set , sel ect t he
3
Group Run/Stop f i el d. The anal yzer w i l l w ai t unt i l t he pr oper si gnal i s
seen at t he PO RT I N BN C bef or e t he m easur em ent begi ns.
PORT IN/OUT Setup Menu
Onl y t he HP 16500B has t he PORT I N BNC . H ow ever , t he PO RT I N si gnal i s
avai l abl e t o m odul es i n bot h t he HP 16500B and HP 16501A f r am es.
W hen usi ng PORT I N , an ext er nal devi ce m ust be connect ed t o t he PO RT I N
BNC on t he r ear panel . I f an ext er nal devi ce i sn' t connect ed, or i s acci dent l y
di sconnect ed, t he i nst r um ent w i l l not t r i gger .
f i el d and set t he l evel t o TTL, ECL, or a U ser
f i el d and t oggl e t he edge t ype t o ei t her Ri si ng
Intermodule Measurements
Configuring Port In/Out
7–9