Tektronix 2215A, Instruction Manual

Page: 67 / 206

Adjustment Procedure— 2215A Service
VOLTS/DIV switch. If trace shift is observed, repeat Step 2
of this procedure. h. ADJUST— Ch 1 MF/LF Comp (C3) and Ch 1 MF/LF
Gain Bal (R47) for the best front corner and flat top.
i. Disconnect the test equipment from the instrument.
6. Adjust Vertical Gain (R145, R195, R76, and R26)
a. Connect a 50-mV standard-amplitude signal via a 50-fi
cable to the CH 1 OR X input connector.
b. Set the A SEC/DIV switch to 0.2 ms.
c. ADJUST— Ch 1 Gain (R145) for an exact 5-division
display.
d. Move the cable from the CH 1 OR X input connector to
the CH 2 OR Y input connector. Set the VERTICAL MODE
switch to CH 2.
e. ADJUST— Ch 2 Gain (R195) for an exact 5-division
display.
f. Change the generator output to 10 mV and set both
VOLTS/DIV switches to 2 mV.
g. ADJUST— Ch 2 2-mV Gain (R76) for an exact 5-divi­
sion display.
h. Move the cable from the CH 2 OR Y input connector to
the CH 1 OR X input connector. Set the VERTICAL MODE
switch to CH 1.
i. ADJUST— Ch 1 2-mV Gain (R26) for an exact 5-divi­
sion display.
j. Set both Input Coupling switches to GND.
k. CHECK— That no trace shift occurs when switching
between the 5 mV and 2 mV positions of the CH 1
VOLTS/DIV switch. If trace shift is observed, repeat Step 2
of this procedure.
I. Set the VERTICAL MODE switch to CH 2.
m. CHECK—That no trace shift occurs when switching
between the 5 mV and 2 mV positions of the CH 2
7. Check Deflection Accuracy and Variable Range
a. Set:
VERTICAL MODE CH 1
Input Coupling (both) DC
b. CHECK— Deflection accuracy is within the limits given
in Table 5-3 for each CH 1 VOLTS/DIV switch setting and
corresponding standard-amplitude signal. When at the 20-
mV VOLTS/DIV switch setting, rotate the CH 1 VOLTS/DIV
Variable control fully counterclockwise and CHECK that the
display decreases to 2 divisions or less. Then return the CH
1 VOLTS/DIV Variable control to the CAL detent and con­
tinue with the 50-mV check.
Table 5-3
Deflection Accuracy Limits
VOLTS/DIV Standard Vertical Accuracy
Switch
Amplitude
Deflection
Limits
Setting Signal (Divisions) (Divisions)
2 mV
10 mV
5 4.85 to 5.15
5 mV 20 mV
4
3.88 to 4.12
10 mV 50 mV 5 4.85 to 5.15
20 mV 0.1 V 5 4.85 to 5.15
50 mV 0.2 V 4 3.88 to 4.12
0.1 V 0.5 V 5 4.85 to 5.15
0.2 V 1 V 5 4.85 to 5.15
0.5 V 2 V 4 3.88 to 4.12
1 V 5 V
5 4.85 to 5.15
2 V 10 V 5 4.85 to 5.15
5 V 20 V 4 3.85 to 4.12
c. Move the cable from the CH 1 OR X input connector to
the CH 2 OR Y input connector. Set the VERTICAL MODE
switch to CH 2.
d. Repeat part b using the Channel 2 controls.
8. Check Input Coupling
5-8
a. Set both VOLTS/DIV switches to 10 mV.