External Z-Axis, Probe Adjust And Front-Panel Setup Functions; Check External Z-Axis Input; Probe Adjust Output; Run Make Factory Settings Routine - Tektronix 2246 1Y Service Manual

Performance Check Procedure—2246 1Y and 2246 Mod A Service
EXTERNAL Z-AXIS, PROBE ADJUST AND FRONT-PANEL
Equipment Required (See Table 4-1)
Calibration generator
Two 50 f l BNC coaxial cables
5 0 - fl Precision BNC coaxial cable

1. Check External Z-Axis Input

a. Set:
READOUT (Intensity)
A INTEN
Vertical MODE
CH 1 VOLTS/DIV
CH 2 INVERT
SCOPE BW
CH 1 Input COUPLING
Horizontal MODE
A SEC/DIV
A/B SELECT
Trigger MODE
Trigger CPLG
Trigger SOURCE
Trigger SLOPE
MEASMN'TS
Trigger HOLDOFF
FOCUS
Horizontal POSITION
b. Connect calibration generator (PG 506)
Ampl output to the CH 1 and the EXT Z-AXIS
inputs via a 5 0 - fl precision BNC coaxial cable, a
BNC T-connector, and a 5 0 - fl BNC coaxial ca­
ble. Set generator to Std Ampl output, 5 V.
c. Set A INTEN to maximum intensity.
d. CHECK—waveform
decreasing at 1.8 V or less and the waveform is
completely blanked out at 3.8 V.
e. Set A INTEN to midrange.
4-28
SETUP FUNCTIONS
For a viewable
readout
For a viewable
trace
CH 1
1 V
Off
Off
DC
A
0.5 ms
A Trigger
AUTO LEVEL
DC
VERT
- r (positive)
All off (press
CLEAR DISPLAY
3 times)
Min
For best
defined display
12 o 'clock
Std
display intensity starts
BNC T-connector
Test oscilloscope with a 10X probe
f. Disconnect the test equipment from the 2246 1Y
or 2246 Mod A.

2. PROBE ADJUST Output

a. Set:
CH 1 Vertical MODE
SEC/DIV
SCOPE BW
b. Connect a 10X probe to the CH 1 input con­
nector and connect the probe tip to the 2246 1Y
or 2246 Mod A PROBE ADJUST output. (When
using Tektronix coded
changes to .IV .)
c. CHECK—For a 5-division vertical display of
PROBE ADJUST square-wave signal (square-
wave period is typically 1 ms, within 25%).

3. Run MAKE FACTORY SETTINGS Routine

a. Press the top and bottom Menu-Select buttons
to display the SERVICE MENU.
b. Press the down-arrow menu button three times
and press SELECT to display the INTERNAL SET­
TINGS MENU.
c. Press the down-arrow menu button once and
press RUN to run the MAKE FACTORY SETTINGS
routine.
d. When the routine is finished, press the CLEAR
DISPLAY button to return to the normal oscil­
loscope mode.
THIS COMPLETES THE
PROCEDURE.
10 mV
0.2 ms
On
probes the readout
PERFORMANCE CHECK