Tektronix 570, Manual

Page: 9 / 134

TYPE 570 CHARACTERISTIC-CURVE TRACER
OPERATING VOLTAGES
VARIMlU
H�AHJ(
1.?5
l"
- DC
\i�RIAf\1 (
+DC
100
between
steps
to supply the
proper heater
v o l t age
for
practically
011
receiving-type
vacuum
tubes. Maximum
power available from the heater transformer
is 30
watts.
Positive dc voltage
is
available
in five
calibrated steps:
20, 50, 100, 200, and 300
volts,
accurate
within
3
%.
The
positive
voltage is
also continuously
variable from
approximately
10
to
300
v. Up
to 50
ma
steady current
is
supplied.
An adequate
reserve
is available for
higher
peak
currents.
Negative
dc
v
ol
t
a
ge
is
available, continuously
vari­
able from ° to
-
100 v. The
negative
dc
supply
is cap­
able
of delivering up
to 1 watt.
ADAPTER PLATES
Eight quick-changing
adapter
plates are furnished
wit h the Type
570
-
2
with
octal
sockets,
2
with
nine­
pin
miniature sockets,
2 with
seven-pin miniature sockets,
and 2
with pilot holes only.
Plate
receptacle holds any
two adapter
plates at the
same
time. Small
banana
iacks
con
nect to each
socket
terminal.
Three
types of
patch
cords are also furnished,
making
it possible
to
connect
any tube element to
any voltage
supplied by
the
instrument.
VOLTMETER
The
built-in
voltmeter indicates
the positive
and
nega­
tive
operating voltages
in seven ranges: °
to
7, 14, 35,
70, 140, 350, 700 volts, accurate within
2
%
of full
scale.
The
voltmeter can be switched
to
show
the
per­
cent of
heater voltage indicated by the heater-voltage
selector switch.
RANGE DC VOll)
)0
Ir.J.D!CAllCN
I
OTHER FEATURES
Tube-Socket Switching-The
TEST
POSITION
switch
in the
ce
nt
e r
of
the front panel is used
to
switch in either
of
two vacuum tubes during comparison tests. It
has
an
OFF position
for
changing
tubes
and
for
establishing
a
reference
trace
on
the screen.
Control-grid potential
drops to
-
150
v
in
the
off position.
Safety
Switch-The
ex
t r e
mel
y flexible
operational­
setup facility
of
the Type
570 requires
that potentially
dangerous voltages be present at the
patch
panel. All
voltages to
the
patch panel
can
be
removed by
a
front
panel switch
for
safety
and
convenience while changing
the operation setup.
A
jewel light
indicates when power
is present
at
the patch panel.
Regulated Power Supply-Electronic
voltage regu­
lation is
used
to compensate for
line-voltage ch
a
nge
s
between
105 and 125
volts
or 210
and
250
volts,
and
for
variations
in
loading. All voltages affecting calibra­
tions
are fully regulated. Heater,
negative-dc,
and
peak-plate
supplies
ere
unregulated.
Cathode-Ray Tube-A
Tektronix
T52P
cathode-ray
.
tube
is
used
in the
Type 570.
Accelerating potential
is
approximately
3 kv. PI phosphor
is
supplied
unless an­
other
phospho'r
is specifically requested.
Illuminated
G r a ti cule - The
10
x
10-division
grati­
cule
is edge-lighted.
Illumination
control, and focus, in-
Tektronix, 'nc.
97