Tektronix 549 Instruction Manual page 14

remote store function. These functions can be controlled by
completing the circuit to ground.
section,
A remote Storage Oscilloscope Control Unit (Tektronix
Part Number 012-0102-00) is available as an optional item.
Th is unit contains upper and lower erase buttons and a
sweep reset button. See Fig. 2-3.
Primary Voltage Range Switches. SW 602 (Internal). A two
position switch selects line voltages from 93.6 to 138.6 VAC,
or 187.2 to 279.2 VAC depending on the position of the
LIN E RANG E switch SW 603.
F ig . 1 - 3 . Remote co n tro l u n it.
Three position switch selects center
LIN E RANG E,
nominal value:
LO W MED
104 VAC 115 VAC
230 VAC
208 VAC
C A U TIO N
Be sure that the in te rna ! switch S W 6 0 2 is in the
2 3 0 VAC position when the power cord is con­
nected to a 2 3 0 VAC nom inal sup p ly source.
Store Controls
UPPER and LO W ER SCREEN
ERASE push buttons provide conventional or stored mode
operation, with manual ERASE control to erase stored infor­
mation.
EN H A N C E MODE: Permits storage of high speed wave­
forms by momentarily changing
levels to increase writing speed. A four position EN H A N C E
M O DE switch permits UPPER Screen, FU LL Screen or LO W ER
Screen enhancement.
EN H A N C E LEVEL control permits adjustment fo r optimum
enhancement.
See the Characteristics
H IG H
127 VAC
254 VAC
STO RA G E: O FF-STO RE-
CRT voltage operating
Operating Instructions— Type 549
IN TEG R A TE: Permits storage of very fast repetitive signals,
by permitting the w riting gun beam to accumulate charges
on the target while the flood gun beams are turned off.
Erase Program
SCREEN SELEC TO R: Selects UPPER, FU LL or LO W ER screen
for the erase program.
V IE W IN G TIM E: Variable control that selects display time
between erasures when in the auto erase mode.
time varies from approximately 0,5 to 5 seconds.
ERASE and RESET Button: Erases display and resets sweep
circuit.
Auto Erase
PERIODIC: Erases the target automatically, independent
of sweep operation, at a time period determined by the
V IE W IN G TIM E control setting.
AFTER SW EEP: Erases the display after the sweep has
run. Viewing time is determined by the setting of the V IE W ­
IN G TIM E control, Resets the sweep circuit after erasure,
O FF: W ith erase program switch in the O FF position,
display must be erased manually,
BASIC OSCILLOSCOPE OPERATION
Sweep Triggering
Proper sweep triggering is essential for a stable presenta­
tion of an input signal. The sweep must be triggered at
the same time relative to the displayed signal.
sweep must be triggered by the input signal or by some
external signal that has a fixed time relationship with the
displayed signal. The external trigger signal must be the
same frequency or a sub-multiple of the input signal.
F ig . 2 - 4 . A M P L IT U D E C A L IB R A T O R , trig g e re d w a v e fo rm .
The SO URC E switch selects one of a variety of possible
triggering signals. For most applications, the sweep can be
triggered internally from the displayed signal. Th is occurs
with the SO URC E switch set at NO RM position.
The PLUG -IN position is
supply a single-channel triggering signal through pin 5 of
the interconnecting plug, such as the Tektronix Type 1A1
Viewing
Thus, the
used with plug-in units that
2-5