Tektronix 549 Instruction Manual page 121

Calibration— Type 549
F ig . 6 - 5 1 . E n h a n c e p u lse a d ju stm e n t.
f. Change the N O RM -SIN G LE SW EEP switch to NORM
position then depress both O FF buttons for the UPPER and
LO W ER SCREEN STORAG E.
g. Set the A TIM E/C M switch to .2 μ SEC position and free
run the sweep by turning the S TA B ILITY and LEVEL control
fully clockwise.
h. Set the N O RM -SIN G LE SW EEP switch to the SIN G LE
SW EEP position and depress both STO RE buttons for the
UPPER and LO W ER SCREEN STO RAG E.
i. Adjust the IN T E N S IT Y ,
until a stored trace is visible, then adjust FOCUS and A STIG
for optimum focus.
j. Slow ly adjust the EN HA N C E LEVEL control clockwise
for optimum storage without background deterioration.
the sweep stores without breaks, increase the TIM E/CM
switch setting for a faster sweep rate.
k. Adjust the Enhance W idth R1132 and then ENHANCE
LEVEL control for optimum storage of the sweep, without
fade positive indication on the screen. (If optimum setting
cannot be found, set the Enhance W idth for a pulse width
of 1 ms.)
. W ith the EN HA N C E LEVEL control set for optimum
l
storage carefully adjust the Enhance Target Level R1140,
for maximum writing speed without background deteriora­
tion.
FOCUS and A STIG controls
If