Tektronix 2445 User Manual

Operator's Checks and Adjustments—2445 Operators
10. Set X10 MAG ON (button in) and adjust the A
control until the two signals are overlaid horizontally.
NOTE
The A REF OR DL Y POS control may also be used
to make the Channel 2 delay-offset adjustment when
the feature is enabled.
11. Push in the B SEC/DIV switch.
AMPLITUDE CHECK
1. Preset instrument controls and obtain a baseline
trace as described in "Initial Setup."
2. Connect a 10X probe to the CH 1 OR X input con
nector and connect the probe tip to the CALIBRATOR
output.
3. Adjust the Channel 1 POSITION control to center
the display on the screen.
4. Adjust triggering controls to obtain a stable display.
5. CHECK—Amplitude of the CALIBRATOR signal is
between 3.88 and 4.12 divisions as measured on the center
vertical graticule line.
6. Repeat this procedure using the Channel 2 connector
and controls.
TIMING CHECK
The CALIBRATOR signal on the 2445 automatically
changes repetition rate with the setting of the A SEC/DIV
switch within the range of 100 ms to 100 ns. This feature
allows the operator to make a quick and easy check of the
basic operation and adjustment of the oscilloscope timing.
Use the following procedure:
1. Preset instrument controls and obtain a baseline trace
as described in "Initial Setup."
2. Connect a 10X probe to the CH 1 OR X input con
nector and connect the probe tip to the CALIBRATOR
output.
3. Adjust the Channel 1 POSITION control to center
the display on the screen.
4. Adjust triggering controls to obtain a stable display.
5. CHECK—Timing accuracy by confirming that five
complete cycles of the square-wave signal are displayed
over 10 major divisions (±0.1 division) along the center
horizontal graticule line for all A SEC/DIV settings from
100 ms to 100 ns. Confirm that the number of cycles
displayed in 10 divisions goes to 2 1/2 and 1 for respective
A SEC/DIV settings of 50 ns and 20 ns and that the
displayed transition time of the signal remains approxi
mately the same when the A SEC/DIV switch is changed
to 10 ns. (The horizontal divisions in which the transition
time of the signal at 10 ns per division is displayed should
be two times the horizontal divisions occupied by the
transition at 20 ns per division.) Return the A SEC/DIV
switch to 1 ms and confirm that the display changes to
1/2 cycle over 10 divisions when the X10 MAG switch is
pressed in.
5-4

Tektronix 2445 Specifications

General

Brand	Tektronix
Model	2445
Category	Test Equipment
Language	English