the rectifiers and other components. When in
operation . the instrument must be placed so
that the air intake at the back is clear of
any obstruction that might impede the flow
o f air. Side panels should also be in place for
proper air circulation. The air filter should
be kept clean. in accordance with cleaning
instructions found in the Maintenance Section of
the manual.
Under no circumstances should your Type 57 0
o s cilloscope be operated without the fan running.
W ithout the fan. ins ide temperature of the
o s cilloscope will rise to a dangerous level in
five to ten minutes.
Power Requirem ents
50 -Cycle Operation - -This instrument is nor
m ally calibrated for a 60-cycle line frequency
at the factory. If the instrument is to be used
for a 5 0 - cycle operation it will be necessary
to readjust the step-generator phase controls.
See Step 7 in the C alibration Section of this
m anual.
234-Volt Operation - - Unless it is tagged for
2 3 4 -volt operation this instrument is connect
ed for 1 17 -volt operation. For 234-volt operation
it is necessary to change the jumpers on two
tr ansformers to connect the primary windings
in series.
For 234-volt operation remove the jumpers
b etween pins 1 and 2 and between 3 and 4 on
T50 1 . Connect a jumper between pins 2 and 3
on T501. Check to see that the fan is connected
electrically to pins 1 and 3 of T50 1 . Remove the
jumpers between pin 1 and 2 and between 3
and 4 on T40 l .
Connect a jumper between
pins 2 and 3 on T40 1 .
Do not change the
connections on the other transformers since
these are still supplied with 1 17 volts. Change
the power line fuse.
Fuse Data
Fuse data for the power line fuse on oscillo
s copes above serial number 5001 is on the
r e a r panel of the instrument adjacent to the
fuse holder.
On instruments below serial
number 5001 see the parts list in this manual.
F use data for the Plate Sweep Generator ( 1 /2
AMP) and Vertical Amplifier ( 1 /1 6 AMP) fuses
is found near the fuse holders. On instruments
with serial numbers of 5000 or below the fusees)
will be found under the access door located on
top of the cabinet. On instruments with serial
numbers above 5000 the fuses are located on
the front panel.
Use only the recommended
fuses for maximum over-current protection.
OSCILLOSCOPE OPERA TION INFO RMATION
Initial Control Settings
This section describes the procedure for set
ting up a typical display of the plate- character
istic curve for a triode and a pentode. A
type 6U8 triode- pentode is specified.
If a
different tube type is used the patch-panel con
n ections should be changed as required. Except
for the heater voltage. these settings can
s e rve as the starting point for checking most
receiving-type tubes.
The settings may then
be altered as required to obtain a useful
pres entation.
NOTE
B e sure the HEA TE R Control is
s et to the proper range before
connecting the heaters of the tube
under test.
Also be sure that the heaters of the
tube under test are connected to
the HT R connectors on the test
p anel.
Set the oscilloscope controls as follows:
POWE R-MAIN
POWE R-TEST
TEST POS ITION
INTENSITY
FOCUS
ASTIGMA TISM
P E A K VOLTS
SE RIES LOAD
HEATE R
VA RIABLE
+ DC
VA RIABLE
-DC
INDICATION
RANGE
DC
VOLTS
STEPS/FAMILY
STEPS/SEC
STA RT ADJUST
VOLTS/STEP
VE RTICAL MA/DIV
ON
OFF
O F F
Midrange
Midrange
Midrange
200
1 0 K
6 . 3
Counterclockwise
100
Counterclockwise
Counterclockwise
HT R
1 40
Midrange
240
Counterclockwise
. 5
1
AA
Operating Instructions - Type 57 0
2 - 3
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