Tektronix 585 - Page 61

SECTION e
CALIBRATION
PROCEDURE
General
The Type 585 Oscilloscope is a stable instrument and
should not require frequent calibration. However, it will be
necessary to recalibrate certain parts of the instrument when
tubes or components are changed, and periodic recalibration
is desirable from the standpoint of preventive maintenance.
In the instructions that follow, the steps are arranged in
the proper sequence for full calibration. Each numbered
step contains the information necessary to make one adjust 
ment. In some steps, two or more adjustments are included
when these adjustments interact or when they can be made
easily without many changes in front-panel control settings.
If a complete recalibration is not necessary, you may per 
form individual steps, PROVIDING that the steps performed
do not affect other adjustments. It is most important that
you are fully aware of the interaction of adjustments. Gen 
erally speaking, the interaction of controls will be apparent
in the schematic diagrams. If you are in doubt, check the
calibration of the entire section on which you are working.
If you make any adjustments on the power supplies, you
will have to check the calibration of the entire instrument.
In particular the sweep rates and vertical deflection factors
must be checked.
NOTE
The performance standards described in this
section of your manual are set up strictly as guides
to calibration of your instrument and should Not
be construed as advertised performance specifica 
tions. For customer specifications, refer to the
“ Characteristics ” section of the manual.
EQUIPMENT REQUIRED
The following equipment is necessary for a complete re 
calibration of the Type 585 oscilloscope:
1. A d c voltmeter having a sensitivity of at least 5000  /v
with corrected readings accurate to at least 1 % at 12.6, 100,
150, 225, 350 and 500 volts, and at least 3% at 1350 volts.
Portable multimeters should be regularly checked against
an accurate standard and corrected readings noted, where
necessary, at the above listed voltages. BE SURE YOUR
METER IS ACCURATE.
2. An accurate rms-reading ac voltmeter, having a range
of 0-150 volts. (0-250 or 0-300 for 234-volt operation).
3. Variable line-voltage auto-transformer (e.g. Powerstat or
Variac) having a rating of at least 7.5 amperes for 117
volts and 4 amperes for 234 volts.
4. Time-mark Generator, Tektronix Types 180, 1 80A, or
equivalent, having markers at 1, 5, 10, 50, 100, 500  sec; 1,
5. 10, 50, 100, 500 msec; 1 and 5 sec; sine-wave outputs of
10 m c and 50 m c ; all having an accuracy of at least 1%.
A coaxial output cable is required with the time-mark
generator.
5. Square-Wave Generator, Tektronix Type 107 or equiv 
alent, having a risetime of no more than 3 nseconds, and
a frequency of approximately 450 kc. The top of the square
wave must be free of overshoot and wrinkles. (See Wave 
form Distortion discussion in Maintenance Section page 5-9).
6. In place of the Type 107, a cleaner and flatter-topped
square pulse can be obtained from either a Type 109 or
Type 110 Pulse Generator. When using a Type 109 or
Type 110, additional accessories are required as follows:
a 50  Charge Line of at least 40-nsec electrical length
(two 120" cables, Part No. 017-504), a 50  output cable
(40" cable, Part No. 017-502), a 10:1 T Attenuator (Part
No. 017-044), and a P80/50Q Adapter to be modified as
noted below this list of test equipment.
7. Square-Wave Generator, Tektronix Type 105 or equiva 
lent, having a risetime of no more than 13 nseconds, a fre 
quency of 20 kc to 25 kc, and a variable output amplitude
from 0.4 volt to 10 volts.
8. Tektronix Type 80 Plug-In Unit.
9. Tektronix Type P80 Probe including 5X and 50X attenuator
heads, plus a Probe Adapter, (Tektronix Part No. 013-017).
10. If the Type 107 Square-Wave Generator of item 5 above
is used, include a 50  P80 Terminating Adapter with a UHF
plug connector, (Tektronix Part No. 017-041).
11. Low-Capacitance Recalibration Tools: See Recalibration
Tools in the Accessories Section of the manual.
Additional Tools: A three-inch screwdriver, a 0.050" alien
wrench, 3/32" alien wrench (or a pointed tool).
12. Clip-lead adapter (013-003) and a 1 k, ½ W composition
resistor.
13. A 27  resistor as illustrated in Figure 5-12 on page 5-8.
14. For calibration of instruments before serial number 2585,
and still unmodified for use with a Type 82 Dual-Trace Plug-
In Unit, it is desirable, but not necessary, to have a TU-3
Test Load Plug-In Unit. See the instruction manual of the
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