Input Ca P Acitance - Tektronix 7a11 Instruction Manual

Operating Instructions-M1
Input Ca
p
acitance
The i np ut ca pacitance of the 7A 11 Amplifier and
P
ro be
h
as
b een designe
d
to be extremely low.
F
or exam ple, in the
5 thr oug h 50 mV positions, input capacitance is 5.8 pF . In
t he .1 through 1 V position it is 3.4 pF, and it is 2.0 pF in
th e 2 thro ugh 20 V
p ositions . These figu res pertain w h en
the
P
ro be is connecte
d d irectly to α circuit and mu st
b
e
2-8
modified wh enever other coupli ng connectors are used . The
AC Couple r
d
evice ad ds 2.4 pF . The R etracta ble
H
ook Ti p
ad ds 1 pF and the STORE D PR OBE
I
NPUT Adapter adds
1 .2 pF . Any ad ditional
d
evices such as conn ectors or cables
between the signal source and
t
he Probe or STORE D
PR OBE
I
NPUT connecto rs will further increase input cap-
acitance .