Instrument Options—455/A2/B2
MAINTENANCE
OBTAINING REPLACEMENT PARTS
Standard Parts
All electrical and mechanical part replacements for Option 7
can be obtained through your local Tektronix Field Office
or representative. However, many of the standard electronic
components can be obtained locally in less time than is
required to order them from Tektronix, Inc. Before pur
chasing or ordering replacement parts, check the parts list
for value, tolerance, rating and description.
Special Parts
In addition to the standard electronic components, some
special components are used in Option 7. These compo
nents are manufactured or selected by Tektronix, Inc. to
meet specific performance requirements, or are manufac
tured for Tektronix, Inc. in accordance with our specifica
tions. Most of the mechanical parts used in this instrument
have been manufactured by Tektronix, Inc. Order all
special parts directly from your local Tektronix Field
Office or representative.
Ordering Parts
When ordering replacement parts from Tektronix, Inc.,
include the following information:
1. Instrument type (include mod or option number).
2. Instrument serial number.
3. A description of the part (if electrical, include
the circuit number).
4. Tektronix part number.
ADJUSTMENTS
Equipment Required
1. DC Voltmeter. 22 to 30 volts.
2. DC Power Source. Variable from 22 to 28 volts
and from 11.5 to 14 volts.
a. Variable power supply with an adequate current rating,
in series with items c or d.
b. 1106 Battery Pack.1 An 1106 Battery Pack will operate
the oscilloscope for about 4 hours.
A source voltage of less than 22 volts will turn off Option 7
when in the 24 volt mode. Starting current in 24 volt mode
is approximately 4 amperes. The dc source must be capable
of handling this current without dropping below 22 volts.
The 12 volt starting current is approximately 8 amperes.
Option 7 is calibrated at the factory using a variable power
supply with the above specifications. This permits the most
accurate adjustment of the Turn-Off Level and the Inverter
Balance. The alternative supplies listed below may also be
used.
c. Two 12 volt wet-cell storage batteries, in series, tapped
at 20, 22, or 24 volts.2
d. 18 to 23 NiCd D cells, 4.0 Amp hr. or greater, furnishing
20 to 28 volts.2
CAUTION <
This procedure is for an external dc source with
the negative lead at ground potential (negative
ground system).
To set the turn off level, the battery is charged above the cut-off point (22 volts). An oscilloscope is connected and the battery allowed to
discharge while its voltage is being monitored. As it reaches 22 volts, the turn-off point is set to cut off Option 7. The turn-off point on Option
7 approximately coincides with the meter zero on the 1106.
This does not permit accurate adjustment of the turn off level. NiCd batteries can be used, following the technique used for item b.
Option 7 Page 5
REV B AUG 1979
To Next Page
Loading...
Need help?
General
