Tektronix 545A Instruction Manual page 11

The Type 545A Oscilloscope is an extremely versatile
instrument which is adaptable to a great number of appli ­
cations. However, to make use of the full potentialities of
the instrument, it is necessary that you understand com ­
pletely the operation of each control. This portion of the
Instruction Manual is intended to provide you with the basic
information that you require. If you are familiar with other
Tektronix Oscilloscopes, you should have very little diffi ­
culty in understanding the operation of the Type 545A
since the function of many controls is the same as the func ­
tion of corresponding controls on other Tektronix instru ­
ments.
Plug- n Units
The Type 545A Oscilloscope is designed to operate with
any one of the Tektronix letter-series plug-in units.
particular plug-in unit used must be selected by you to
satisfy the requirements of your application.
the plug-in unit for any particular application, you must
consider the bandpass, sensitivity, and the type of input
required for that application. The plug-in units available
will satisfy the requirements for most applications.
Fig. 2-1. nserting the selected plug-in unit into the oscilloscope
plug-in unit compartment.
NSTRUCT ONS
Preparation for use
When the plug-in unit has been selected, insert it into
the plug-in compartment of the oscilloscope and press
firmly to insure that the connectors make proper contact
(see Figure 2-1). Tighten the plug-in unit locking control to
hold the unit securely in place and turn the oscilloscope
INTEN ITY
power cord to the rear of the instrument and to the power
line and place the POWER switch in the ON position.
Time Delay
Time delay relays used in Type 545A Oscilloscopes delay
operation of the instrument for approximately 25 seconds
after the POWER switch is turned on to allow a brief tube ­
warmup period. The delay allows the tubes sufficient time
to heat before the d c perating voltages are applied.
If the ac power is off for only an instant, the normal 25-
The
second delay will occur before the instrument returns to
full operation. This delay will occur regardless of whether
In selecting
the ac power is off because of a momentary power failure
or is turned off with the POWER switch.
Focus and Astigmatism Contois
The FOCU
junction with each other to allow you to obtain a sharp,
clearly defined spot or trace.
A TIGMATI M control is obtained by rotating the FOCU
control fully clockwise, setting the HORIZONTAL DI PLAY
switch to EXT. x 10, and adjusting the INTEN ITY control to
obtain a spot on the screen. After positioning the spot to
the center of the screen, the A TIGMATI M control is ad ­
justed for the most nearly circular spot possible. The FOCU
control is then adjusted to reduce the spot diameter as much
as possible. (You must be certain that all input signals to
the oscilloscope are disconnected when you adjust the
FOCU and A TIGMATI M controls.)
ntensity Control
The INTEN ITY control is used to adjust the brightness
of the oscilloscope display. This permits you to compensate
for changes in brightness resulting from changes in the
sweep or triggering rate. The INTEN ITY control is rotated
clockwise to increase brightness and counterclockwise to
decrease brightness. Care must be taken when using the
INTEN ITY control that the brightness is not turned up to
SECT ON
OPERAT NG
control fully counterclockwise.
and A TIGMATI M controls operate in con ­
The proper setting of the
2
Connect the
2-1