Preliminary Calibration Procedure; Preliminary Performance Check Procedure - Tektronix CURVE-TRACER 576 Instruction Manual

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Making Adjustments
When doing a complete calibration or a complete adjust-
ment of the instrument, each internal control should be
adjusted as near the specified setting as possible, even if the
observed performance is within tolerance. When doing only
a partial adjustment, do not readjust any controls unless the
observed performance is outside the given tolerance. In
either case, do not preset any adjustments unless they are
known to be significantly out of adjustment or repairs have
been made in the circuit. In these instances, set the partic-
ular controls to midrange.
Preliminary Calibration Procedure
1. Remove the side panels from the Type 576. See
Warning in the Maintenance Section of this manual, page
4-11.
2. Set the Line Voltage Selector assembly and the 60
Hz-50 Hz switch on the Type 576 rear panel in accordance
with the line voltage source to be used.
3. Connect the autotransformer and other test instru-
ments to a suitable power source. Connect the Type 576 to
the autotransformer output.
4. Set the autotransformer for the line voltage and range
chosen on the Type 576 Line Voltage Selector assembly.
5. Turn on the autotransformer, Type 576, DC volt-
meter and test oscilloscope. Allow at least 5 minutes warm-
up at an ambient temperature of +25°C ±5°C (+77°F
±9° F) before making any checks or adjustments.
6. Connect the 1 X probe to the vertical input of the test
oscilloscope.
7. Set the instrument controls as shown in the list of
Initial Control Settings prceding step 1 and start the adjust-
ment and calibration procedure with step 1.
Preliminary Performance Check Procedure
1. Set the Line Voltage Selector assembly switches and
the 60 Hz-50 Hz switch on the Type 576 rear panel in
accordance with the line voltage source to be used.
2. Connect the Type 576 to the line voltage source.
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• 3. Turn on the Type 576. Allow at least 5 minutes
,....,., warmup at an ambient temperature between 0°C and
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+50°C (+32°F and +122°F) before making any checks.
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Performance Check/Calibration-Type 576
4. Set the controls as shown in the I ist of Initial Control
Settings preceding step 1 and start the performance check
procedure with step 6.
TABLE 5-2
Performance Check/Calibration Record and Index
Step Title Adjust Req'd Page
No. Previous
Steps
1
Adjust -75 Volt
R721
5-4
Supply
2 Adjust Calibrator R512 1 5-5
Voltage
3 Check Other Power
1
5-6
Supply Voltages
4 Check Power Supply
1
5-7
Regulation
5 Adjust CRT R891, R897, 1, 3
5-7
Controls
R685, R893
6 Check CRT Controls 5-9
7 Check Readout 5-9
8 Adjust Balance of R681, R650, 1, 3 5-10
Horizontal Display
R645
Amplifier
9 Adjust Balance of R581, R550, 1' 3 5-11
Vertical Display
R545
Amplifier
10 Adjust Horizontal R692, R592 1, 3, 8, 9 5-11
and Vertical CRT
Gain
11 Adjust Horizontal
R673, R573
1, 3, 8, 9, 5-12
and Vertical Magni-
10
fier Gains
12 Adjust Horizontal R636, R638, 1, 2, 3, 8, 5-12
Display Amplifier
R641 9, 10, 11
Gains
13 Adjust Vertical Dis- R536, R538, 1, 2, 3, 8, 5-12
play Amplifier Gains R541
9, 10, 11
14 Adjust Horizontal
C433 1, 3
5-13
Compensation
15 Check Horizontal
5-14
and Vertical
Positioning and
INVERT Button
16 Check Horizontal
5-15
and Vertical
Displayed Noise
17 Check Display Off-
5-16
set and CAL Button
18 Check Horizontal
5-16
Display Accuracy
5-3