TB 9-4931-503-35
(14) Adjust MAIN TRIG LEVEL control for a stable display on oscilloscope.
(15) Adjust oscilloscope INTENSITY control until intensified portion of trace is
clearly visible.
(16) Adjust POSITION control to start trace at extreme left graticule line of display.
(17) Adjust DELAY TIME MULT dial to position start of intensified portion of trace
on 2d vertical graticule line. If DELAY TIME MULT dial does not indicate between .97
and 1.03, perform b (3) through (6) below.
(18) Adjust DELAY TIME MULT dial to position start of intensified portion of trace
on 10th vertical graticule line. If DELAY TIME MULT dial does not indicate between 8.89
and 9.11, perform b (3) through (6) below.
b. Adjustments
(1) Set TI MAIN SEC/DIV switch to 1 , DLY'D SEC/DIV switch to .5 and
oscilloscope calibrator MARKER output for .5 S/D. If necessary, adjust oscilloscope
calibrator EDIT FIELD knob for a 0.0% err display indication.
(2) Adjust TI POSITION control to align 1st time marker with 1st vertical graticule
line (extreme left). Adjust C615 HF TIM (fig. 2) to align one time marker per division (R).
(3) Adjust DELAY TIME MULT dial to 1.00 and adjust R530 DLY STRT (fig. 2)
until intensified portion of trace starts on 2d vertical graticule line (R).
(4) Adjust DELAY TIME MULT dial to 9.00 and adjust R522 DLY STP (fig. 2)
until intensified portion of trace starts on the 10th vertical graticule line (R).
(5) Press DISPLAY MODE DLY'D SWP pushbutton. Adjust R530 DLY STRT and
R522 DLY STP (fig. 2) equally until time marker is just visible at start of trace.
(6) Press DISPLAY MODE INTENS SWP pushbutton and repeat (3) through (5)
above, as necessary, for best compromise.
11. Final Procedure
a. Deenergize and disconnect all equipment. Replace protective covers and cabinet panels.
b. Annotate and affix DA label/form in accordance with TB 750-25.
TIME BASE, TEKTRONIX, TYPE 5B40
12. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
