Tektronix CA PLUG-IN, Instruction Manual

Page: 7 / 48

O I M 2
OPERAT1NG
IN S T R U C T IO N S
Plug the unit into a Tektronix convertible
O scilloscope and turn the power on. Allow
the instrument to reach operating temperature,
about 2 to 3 minutes and free-run the sweep
at 1 millisecond/cm, Turn the MODE switch
to A O N LY and the A-channel P O L A R IT Y and
AC-DC switches to NORMAL and DC respect-
ively. Position the trace to about + 2 cm with
the A-channel V E R TIC AL POSITION control.
Turn the MODE switch to B O N LY and the
B-channel P O L A R IT Y and AC-DC switches
to NORMAL and DC respectively. Position the
trace to about -2 cm with the B-channel V E R ­
T IC A L POSITION control.
Now turn the MODE switch to CHOPPED.
Two traces w ill appear on the crt screen.
Notice that the A-channel V E R TIC AL POSITION
control moves the upper trace and the B-
channel V E R TIC A L POSITION control moves the
low er trace. Increase the sweep speed to 100
microsecond/cm and notice that each trace
is composed of many start-duration elements.
The two channels are being switched at approx-
imately 100 kc so that each channel conducts
fo r about 5psec and then is cut off while the
other channel conducts for an equal time.
Now turn the MODE switch to the ALTE R N A TE
Position. There are still two traces on the crt
screen but the traces are no longer chopped
into small bits. F or each sweep cycleonechan­
nel is conducting and the other is cut off.
The channels are switched at the end of each
sweep cycle.
Note
Either of the two identical amp-
filied channels can be used in-
dependently by turning the MODE
switch to A O N LY or B ONLY
and connecting the Signal to be
observed to the appropriate input.
The following remarks apply equally
w ell to either am plifier channel.
PROBE CHARACTERISTICS
PRO BE
T Y P E
COLOR
CODE
A T T E N U A ­
TION
RATIO
IN PU T IM PEDANCE INSERTION
LÖSS AT
30 mc (db)
VOLTAGE
RATING
(Peak-to-Peak)
Resistance
(megohms)
TvDical Capacitance
Minimum* Maximum**
P410 Brown
nose 10:1 10 8pf
12pf+ llp f
15pf +
1 600
P510 Black
Nose
10:1 10 14pf
1
600
P6000 None 10:1 10 11.5pf 14.5pf 1.2 600
P6017 None 10:1 10 12.5pf
12.5pf
1 600
*When connected to instruments having 20 ß ß i capacitance (input).
**When connected to instruments with input capacitance up to 50 ppf.
f With 8-foot cable.
AA
Operating Instructions - Type CA
2-1