Tektronix 7B15 Instruction Manual page 91

b . EXAMINE---Display pulse for minimum spike and
optimum flat top .
c . ADJUST"----C117 (External Trigger Comp) on the
Trigger circuit board for minimum spike and optimum flat
top on the displayed pulse .
A3 . ADJUST TRIGGER SENSITIVITY (R147)
SETUP CONDI'T'IONS
If the preceding step was not performed first
refer to the Triggering System Preliminary
Control Settings, then proceed with the
following instructions .
71315 Controls :
TRIGGERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NORM, INT
LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stable display
TIME/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ms
NOTE
Vertical Amplifier (HI Freq) . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 V/div
Low-Freq Function Gen . . . . . . . . . . . . . . . . . . . . 1 kHz, sine wave
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 div
a . Set the amplifier plug-in unit deflection factor for 1V
(0 .2 division) .
b. EXAMINE--For a stable 0 .2 division display (set
TRIGGERING LEVEL control as necessary) .
c . ADJUST--R147 (Sensitivity) on the Trigger circuit board
for a stable 0 .2 display .
Calibration Part II---71315
Adjustment and Performance Check
A4 . CHECK TRIGGERING MODES
SETUP CONDITIONS
NOTE
If the preceding step was not performed, first
refer to the Triggering System Preliminary
Control Settings, then proceed with the
following instructions .
71315 Control :
TRIGGERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUTO, INT
TIME/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ps
BNC Cable
Low-Freq Function Gen . . . . . . . . . . . . . . . . . . . . . 50 kHz, sine wave
Vertical Amplifier (HI Freq) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 div
a . Set the TRIGGERING LEVEL control for a stable display
(TRIG'D light on) .
b . CHECK--For a free-running display with TRIG'D light
off when the TRIGGERING LEVEL control is set fully
clockwise and fully counterclockwise .
c . Set the TRIGGERING MODE to NORM .
d . Set the TRIGGERING LEVEL control for a
(TRIG'D light on) .
stable display
e . CHECK---For no display (TRIG'D light off) when the
TRIGGERING LEVEL control is set fully clockwise and
fully counterclockwise .
f . Set the TRIGGERING LEVEL control for a stable display
(TRIG'D light on) .
g . Set the TRIGGERING MODE to SINGLE SWP and the
SOURCE to EXT.
h . CHECK--Press the SINGLE SWP RESET push button
and check that the READY light is on .