Tektronix 570, Manual

Page: 49 / 134

for 5 dots. Now turn the STEPS/F AMIL Y Control
c lockwise and check to see that at least 1 3
dots can b e seen before you enter the area
for the SINGLE F AMILY button.
After checking for at least 13 dots continue
to rotate the STEPS/F AMIL Y Control clock­
wise into the Single Family area. Push the
S INGLE F AMIL Y button and obtain one sweep
each time it is pushed. Rotate the STEPS/
F AMIL Y Control counterclockwise until a con­
s tant display of dots is once again displayed.
1 7 . Checking HEATER Control a n d Adjust­
ing AC Volts Adj. (R350)
Connect an accurate ac voltmeter between
the two HTR connectors on the test panel.
Adjust the HEATER VARIABLE until a reading
of 6 . 3 volts is obtained on the voltmeter. Now
turn the INDICATION Control to HTR and while
observing the 0 - 1 40 volts scale, on the meter
of the Type 57 0 , adjust R350 for a meter
reading of 100% ( 100 volt pOsition) . Disconnect
the ac voltmeter from the HTR connectors on
the test panel.
H E AT E R VOLTS/DIV Divisions
S etting
Control
of Deflection
1 . 25 . 2 8 . 8
1 . 4 . 2
9 . 9
2 . 0
. 5 5 . 6
2 . 35 . 5 6 . 6
2 . 5
. 5 7 . 0
3. 1 5 . 5 8 . 9
4 . 2
1
5 . 9
4 . 7 1 6 . 6
5 . 0
1
7 . 0
6 . 3 1 8 . 9
7 . 5
2 5 . 3
1 2 . 6 2 8 . 9
1 8 . 9 5
5 . 3
25
5
7 . 0
35
5 9 . 9
50
10 7 . 0
1 17 20 8 . 3
Remove the jumpers from the test panel.
With a jumper connect the P connector on
the test panel to groun d , and turn the PLA TE­
G RID Control to PLATE and the VOL TS/DIV
C ontrol to 1 .
Position the spot under the
far left hand graticule line. Now change the
j umper from ground to the " hot" HTR connector
on the test panel. A horizontal deflection of
8 . 9 divisions should be obtained.
When checking through the ranges of the
H E AT E R Control , be sure to maintain the heater
voltage at 100% as read on the meter of the
Type 570.
If the voltage is other than 100%
it maybe adjusted to 100% with the HEATER
V ARIABLE Control.
The accuracy of the
H E AT E R Control should be within ±59'0 in all
positions.
1 8 . Checking PEAK V O LTS Control
Reset the VOL TS/DIV Control to . 5 , the
P L AT E - GRID Control to PLATE and the SERIES
LOAD to 300. Check each of the positions of
the P E A K VOLTS Control for the proper de­
flection (±59'0) as in the table below.
V O L TS/DIV
P E AK VOLTS Divisions
Control Control of Deflection
. 5
5 10
1 1 0
10
2
20 10
5 50
1 0
1 0 100
1 0
20
200
1 0
50 300
6
50 500 10
1 9. Checking S E R I E S LOAD Resistor Values
Turn off the POWE R-MAIN o f the Type 570.
Connect an accurate ohmmeter between pin
3 of V 3 1 5 and the P connector on the test
panel. Set the SERIES LOAD Control to each
position and read the value on the ohmmeter.
The values should be within ±59'0 of the front
panel value.
20. Adjusting Plate Sweep (C31 1 ) a n d Plate Tran�
(C3 1 5) Current Balance Capacitors
Reset the following controls:
MA/DIV
VOLTS/DIV
PLATE-SCREEN-
GRID
PLATE-GRID
POWE R-MAIN
PEAK VOLTS
S E RIES LOAD
.02
50
P L ATE
PLATE
ON
500
1 M
AA C alibration Procedure - Type 570
5 -7