Tektronix 2445A - Horizontal

Performance Check-2445A/2455A Service
HORIZONTAL
Equipment Required (see Table 4-1)
Primary Leveled Sine-Wave Generator (Item 2)
Calibration Generator (Item 3)
Time-Mark Generator (Item 6)
INITIAL CON"rROL SETTINGS.
Control settings not listed do not affect the procedure.
a. Set:
NOTE
Select channels to set
VOL TS/DIV.
VERTICAL
CH 1 and CH 2
VOLTS/DIV
CH
1 VAR
CH 3 and CH 4
VOLTS/DIV
CH
1
CH 2, CH 3, CH 4,
ADD, and INVERT
CHOP/ALT
20 MHz
BW LIMIT
CH
1 and CH 2
Input Coupling
HORIZONTAL
A SEC/DIV
SEC/DIV VAR
X10 MAG
TRACE SEP
Delta
tN and .:lt
TRACKING
TRIGGER
HOLDOFF
LEVEL
SLOPE
MODE
SOURCE
COUPLING
0.5
V
In detent
0.1 V
On
Off
ALT
Off
500 DC
200 ns (knob in)
In detent
Off
Fully CW
Off (press and release
until associated readout
is off)
Off
BENDS A
Midrange
+ (plus)
AUTO
LVL
VERT
DC
Precision
50-0 BNC Cable (Item 9)
Dual Input Coupler (Item 11)
1. Check Horizontal Display Modes (A, A INTEN,
ALT, and B).
a. Use a 50-0 BNC cable to connect 200 ns time mark-
ers from the Time-Mark Generator
to the CH 1 OR X input
connector.
b. Adjust the TRIGGER LEVEL control as necessary for
a stable signal display.
C. Pull the SEC/DIV knob out and set the B TRIGGER
MODE
to RUN AFT DL Y.
NOTE
On CTT instruments, rotate the L1 REF OR DL Y
POS control for the specified
delay. As the control is
rotated, the readout delay
value will be followed by
the word
"SET". This value shows the approximate
delay. A few seconds after control movement has
stopped, the word
"SET" will disappear and the
readout delay
value as measured by the CTT will
appear.
This is normal operation and not cause for
concern.
d. Set the .:l REF OR DL Y control for a DL Y readout of
approx 1000 ns.
e. VERIFY-An intensified zone appears on the
displayed signal near graticule center. The INTENSITY
control may need adjustment.
f. Rotate the .:l REF OR DL Y POS control to center the
intensified zone on one
of the time markers near graticule
center.
g. Set the B SEC/DIV
to 50 ns (knob out).
4-21