Operation - RCA 54-45 Manual

The VERTICAL POSITION and HORIZONTAL POSITION controls adjust the location of the trace
on the screen. Turning the HORIZONTAL POSITION knob shifts the trace left or right, and turning
the VERTICAL POSITION knob moves the trace up or down.
The VERT. INPUT and ground terminals provide for connection of external signals to the vertical
amplifier.
The VERTICAL-ATTENUATOR ( LO - HI) switch provides a choice of no attenuation (LO) or 100: 1
frequency compensated attenuation (HI) of the input voltage fed to the vertical amplifier.
The VERTICAL GAIN control allows continuous adjustment of the vertical amplifier gain.
used with the VERT. ATTENUA TOR selector to adjust trace height to the desired value.
The SYNC SELEC TOR has two positions to permit selection of internal or external sync voltages
for the sweep oscillator. At the INT. position, the synchronizing voltage is taken internally from the
vertical amplifier .
HORIZ . INPUT terminal and ground, is fed to the sweep oscillator.
The SWE EP RANGE switch selects the frequency band over which the SWEE P VERNIER can be
varied for frequency adjustment of the internal linear sweep, and also serves as the horizontal input
selector. In the four most clockwise positions , the numbers above the position markers are the upper
and lower limits of the band (approximately) covered by the SWEEP VERNIER at the particular posi­
tion. At either of the two most counterclockwise positions of the SWEEP RANGE SWITCH.
LINE and EXT. HOR. , the sweep oscillator is disabled. At the 60 C PS LINE position, an a-c sinewave
_
signal of power line frequency is taken from the power supply and applied to the input of the hori2ontal
amplifier. At the EXT. HOR. position, an external signal voltage applied between the HORIZ. INPUT
terminal and ground is applied to the input of the horizontal amplifier .
The HORIZONTAL GAIN control is effective only at the EXT. HOR. position of the SWEEP RANGE
switch. It allows continuous adjustment of the horizontal amplifier-gain when an external signal volt­
age is applied to the HORIZ. input terminals . At all the internal sweep positions and the 60 C PS LINE
position, fixed full screen horizontal deflection is obtained.
1-4. NOTES ON CONTROLS AND TERMINALS
1. Proper trace definition will be obtained if the astigmatism control is correctly adjusted, and
the 'scope is not operated in strong fields such as are found near transformers, transmitters, and
power generating equipment, etc . , which may distort the electron beam that produces the trace.
2. A sharply focused short line, or a small spot of high intensity, should not be permitted to
remain stationary on the screen for any considerable length of time (more than 1/2 miiUite), or the
screen will be burned. A trace of excessively high intensity will burn the screen in 3 to 5 minutes .
These burned portions of the screen will no longer fluoresce and are useless for observation. If it is
required to have a fixed trace on the screen for a long period, reduce the trace intensity to minimum.
3. Trimmer capacitor C1 is used for frequency compensating the ver t ical attenuator at the 100: 1
(HI) position. See MAINTENANC E section for adjustment procedure.
4. The EXT. position of the SYNC SELECTOR is for use with generators of other devices which
have sync outputs .
5 . At maximum gain settings , the sensitivity of the amplifiers is very high. Under these condi­
tions stray pickup may produce patterns on the screen when no signal source is connected to the vertical
input terminals . This is normal and does not interfere with the 'scope operation.
II.
SEC TION OPE RATION
NOTE : To obtain proper results with your 'scope, it is advisable to become acquainted with
functions and correct use of the panel controls and terminals by making some simple
At the EXT. position, an external synchronizing voltage, applied between the
25
It is
60 C PS