Tektronix 545A Instruction Manual page 10

Characteristics
—
Type
545A
example-, observing
the junction characteristics of
transis-
tors,
or measuring
the resistance,
capacitance
or
inductance
of
circuit
components.
The
Type
S offers calibrated
forward
currents
in
five
fixed steps
from
1
to
20
milliamps,
and
reverse currents
calibrated
in six
steps
from 0
to 2 milliamps.
Diode
shunt
capacitance
is
9
picofarads,
and
deflection factors
are 0.05
v/cm and
0.5v/cm,
calibrated.
Type
T
The Type T Time-Base Generator
provides
sawtooth
sweep
voltages from
0.2
j±
sec/div
to
2 sec/div.
The
trigger
source
may
be
line
frequency,
external,
ac or dc coupled, auto-
matic or high-frequency
sync.
The
triggering point
can be
on
either rising
or
falling
slope of the
waveform, and
trig-
gering
level
is
adjustable.
A
signal of 0.2 to
50
volts
is
required
for triggering.
Type
Z
The Type Z
Plug-In Unit extends the
accuracy
of
oscillo-
scope voltage measurements.
It
can be used
in
three
modes
of operation:
(1)
as
a conventional
preamplifier,
(2)
as a
differential input preamplifier, or
(3)
as a calibrated
differ-
ential
comparator. With
sensitivity
of 50
mv/cm and
in-
sertion
voltage range
of
±100
volts, the effective scale
range
is
±2000
cm.
Maximum
resolution of the
Type
Z
Unit
is
.005%.
As
a
conventional
preamplifier, the
Type
Z
Unit
offers
a passband
of
dc
to
13
me
for the
545A
for signals that
do
not overscan
the screen.
The
deflection factors
are
0.05
volts/cm
to
25
v/cm
in
9 fixed, calibrated steps.
As
a
differential
input preamplifier, the
Type Z
accepts
a
common-mode
signal level
±100
volts
with input attenu-
ation XI,
and
offers
a
common-mode
rejection ratio
of
40,000 to
1.
Maximum
input signal
is
1
volt/7 nsec, or
—
1
volt/5 nsec.
As
a calibrated
differential
comparator,
the
Type Z makes
available
three
comparison voltage
ranges;
from zero
to
±1
volt,
zero
to
±10
volts,
zero
to
±100
volts.
®i
1-5