Tektronix CURVE-TRACER 576 Instruction Manual page 185

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L'-'
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t. CHECK
FOR-~
OR gm PER DIV readout coinciding
with the third column of Table 2-7.
2. Check Horizontal and Vertical Displayed Noise
a. Set the following Type 576 controls as listed:
VERTICAL
HORIZONTAL
1pA COLLECTOR
. 05 V COLLECTOR
b. Install the protective box on the Standard Test
Fixture and close the lid.
c. Turn the Type 576 MAX PEAK VOLTS switch
throughout its range. (Be sure the CENTERLINE VALUE
switch is set to 5.)
d. CHECK FOR-Horizontal width of spot no greater
than indicated in Table 2-8 for Horizontal Collector Volts,
for each position of the MAX PEAK VOLTS switch.
e. Set the HORIZONTAL switch to .05 BASE. Lift the
lid of the protective box and install a 1 Mrl resistor
between the base and emitter jacks (right side). Close the
lid of the protective box and set the LEFT-OFF-RIGHT
switch to RIGHT.
f. Repeat parts c and d, using the Horizontal Base Volts
values from Table 2-8.
g. Set the LEFT-OFF-RIGHT switch to off and remove
the 1 Mrl resistor.
h. Set the following Type 576 controls to:
HORIZONTAL
DISPLAY OFFSET Selector
POSITION (Vertical)
POLARITY
VARIABLE COLLECTOR
SUPPLY
200 COLLECTOR
NORM (OFF)
1 position clockwise
+(NPN)
Fully clockwise
i. Turn the Type 576 MAX PEAK VOLTS switch
throughout its range.
NOTE
The LOOPING COMPENSATION control will affect
this check. Adjust it for minimum looping.
ADD AUG 1984
Performance Check-Type 576
j. CHECK FOR-Vertical width of display no greater
than indicated in Table 2-8 for Vertical Collector Current,
for each position of the MAX PEAK VOLTS switch.
k. Set the MODE switch to LEAKAGE (EMITTER
CURRENT).
I. Repeat parts i and j using Vertical Emitter Current
values from Table 2-8 .
m. Remove the protective box.
TABLE 2-8
Check Horizontal and Vertical Displayed Noise
Horizontal or MAX PEAK VOLTS Switch
Vertical Range
15 75 350 1500
Horizontal
Collector Volts 1 div 1 div 4 div 40div
Base Volts 1 div 1 div 1 div 1 div
Vertical
Collector Current 1 div 1 div 2 div 5 div
Emitter Current 1 div 1 div 2 div 5 div
3. Step Generator Limits-Current Mode
a. Set the following Type 576 controls as listed:
VERTICAL
HORIZONTAL
POSITION (Vertical)
MAX PEAK VOLTS
VARIABLE COLLECTOR
SUPPLY
POLARITY
MODE
STEP GENERATOR AMPLI-
TUDE
OFFSET
STEP FAMILY
1 A COLLECTOR
10 V COLLECTOR
Centered
15
Fully Counterclockwise
AC
NORM
100 rnA
AID
REP
b. Connect a patch cord with banana plugs between the
base and collector jacks (right side) of the Standard Test
Fixture. Set the LEFT-OFF-RIGHT switch to RIGHT.
c. Press the ZERO button and position the spot to the
center of the CRT graticule. Release the ZERO button.
d. CHECK FOR-Lowest spot in the display at least 1.5
divisions below the center horizontal graticule line (at least
1.5 A).
A-27