Tektronix 576 - Page 41

Some
Commo
n M
eas ur ements
O p e r ating Instructions-Type 576
To
measure t he forward cu rre n t and
voltage c h aracte
r
istics of α tu n nel dio de or α back
dio d e, suc h as t h e p ea k p oint an
d valley
p oint c
u rrents
and
voltages, p ut t he cat h ode of
t h e dio de in t he emitter terminal
of t h e test soc k et and t he ano de of t he diode in t he
collector terminal . A pp ly voltage
to t h
e
device wit h t he VA R IA BLE COLLECTOR
S UPPL Y control . For most accurate measurements
of
p
ea k a nd valley points, use t h e
mag n ifie d d is p lay offset as d escribe d in ste p s 42 t h roug h
46
of t he First
Time O p eration
instructions .
Current an d voltage
i
n t he reve r se direction a r e measure d in t h e same ma n ner as in t h e
forwar d d i r ectio n
exce
p t t
h at t h e P OL A R ITY switc h is set to -( ΡΝΡ ) . For α dis p lay of
currents a n d voltages in both directions, set
t h
e
POLARITY switc h to AC .