Tektronix 2335, Instruction Manual, Page: 48 / 104

7. If focusing is not uniform over the entire graticule
area, use a smail-biaded screwdriver to adjust the ASTIG
control (see Figure 3).
8. Since the ASTIG and FOCUS adjustments interact,
repeat steps 6 and 7 fo r the best defined display over the
entire crt graticule area.
VERTICAL GAIN CHECK
1. Preset instrument controls and obtain a Normal
Sweep Display (refer to "Instrum ent Fam iliarization").
2. Set:
AC-GND-DC (both) DC
3. Connect a 10X probe to the Channel 1 input con­
nector and connect the probe tip to the AMPL CAL output.
4. Adjust the INTEN control fo r desired brightness and
adjust the FOCUS control for best defined display.
5. Adjust the A TRIGGER LEVEL control for a stable
display o f the AMPL CAL signal.
6. Adjust the Channel 1 POSITION control to vertically
center the display.
7. Check fo r a vertical display amplitude of 4 divisions
±0.2 division (3.8 to 4.2 divisions). See Figure 11.
8. Repeat steps 3 through 7 using Channel 2.
.
:
1
t '
4 D IV
±0.2
D IV
*
1
4 1 1 5 - 1 8
2335 Operators
35
Figure 11. Vertical display accuracy.