Tektronix CURVE-TRACER 576 Instruction Manual page 182

Performance Check-Type 576
5. Set DISPLAY OFFSET Selector switch to NORM
(OFF) and the HORIZONTAL and the MAX PEAK
VOLTS switches to the next positions shown in Table
2-3. (Always set HORIZONTAL switch first to avoid
damage to horizontal amplifier.)
6. Repeat parts 1 through 5.
k. Set the following Type 576 controls to:
DISPLAY OFFSET Selector
MODE
VARIABLE COLLECTOR
SUPPLY
NORM (OFF)
NORM
Fully counterclockwise
9. Check Collector Supply Minimum Peak
Currents
a. Set the Calibration Fixture Step Generator Loads
switch to 1 k Collector Short.
b. Press the ZERO button and position the spot on the
zero horizontal graticule line. Release the ZERO button.
c. Set the Type 576 VERTICAL and MAX PEAK
VOLTS switches as shown in Table 2-4. (Always set the
VERTICAL switch first to avoid damage to the vertical
amplifer.)
TABLE
2-4
Check Collector Supply Peak Current
Minimum Peak
VERTICAL MAX PEAK VOLTS Currents
20mA
1500 10 divisions (200 rnA)
.1 A 350 10 divisions (1 A)
.5 A 75 8 divisions (4 A)
2A 15 10 divisions (20 A)
d. For each setting of the MAX PEAK VOLTS switch,
turn the VARIABLE COLLECTOR SUPPLY control clock-
wise until the minimum peak current shown in Table 2-4 is
reached, then return the VARIABLE COLLECTOR
SUPPLY control to its fully counterclockwise position.
~
Do not exceed the rating of the collector supply as
shown in Table 2-4. Return the VARIABLE
COLLECTOR SUPPLY control to its fully counter-
clockwise position as soon as the given current has
been obtained.
A-24
e. CHECK FOR-Minimum peak current values as
shown in Table 2-4 under Minimum Peak Current.
10. Check and Adjust LOOPING COMPEN-
SATION Control
a. Turn off the Type 576, remove the Calibration
Fixture and install the Standard Test Fixture. Turn on the
Type 576. Install the protective box on the Standard Test
Fixture and close the lid.
b. Set the VERTICAL switch to 1 JJ.A and the vertical
POSITION switch one position clockwise.
c. Set the MAX PEAK VOLTS switch and HORIZON-
TAL switch as shown in Table 2-5. (Always set MAX PEAK
VOLTS switch first to avoid damage to horizontal
amplifier.) Turn the VARIABLE COLLECTOR SUPPLY
fully clockwise.
TABLE 2-5
Check LOOPING COMPENSATION Control
MAX PEAK VOLTS
HORIZONTAL
1500
200 V COLLECTOR
350 50 V COLLECTOR
75 10 V COLLECTOR
15 2 V COLLECTOR
d. For each setting of the MAX PEAK VOLTS switch,
turn the LOOPING COMPENSATION control throughout
its range.
e. CHECK FOR-Looping passing through zero for each
setting of the MAX PEAK VOLTS switch.
f. Set the MODE switch to DC.
g. ADJUST -LOOPING COMPENSATION control for
minimum vertical width.
This concludes the performance check procedure.
ADD AUG 1984
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