Tektronix 2215A, Instruction Manual

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Performance Check Procedure— 2215A Service
b. Connect the leveled sine-wave generator output via a
50-52 cable and a 50-52 termination to the CH 2 OR Y input
connector.
c. Set the generator to produce a 50-kHz, 6-division
display.
d. CHECK— Display amplitude is 4.2 divisions or greater
as the generator output frequency is increased up to the
value shown in Table 4-3 for the corresponding VOLTS/DIV
switch setting.
Table 4-3
Settings for Bandwidth Checks
VOLTS/DIV Generator
Switch Setting Output Frequency
2 mV 50 MHz
5 mV to 5 V 60 MHz
e. Repeat parts c and d for all indicated CH 2 VOLTS/DIV
switch settings, up to the output-voltage upper limit of the
sine-wave generator being used.
f. 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.
g. Repeat parts c and d for all indicated CH 1
VOLTS/DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
3. Check Bandwidth Limit Operation
a. Set:
BW LIMIT On (button in)
CH 1 VOLTS/DIV 10 mV
A SEC/DIV 20
ns
b. Set the generator to produce a 50-kHz, 6-division
display.
c. Increase the generator output frequency until the dis­
play amplitude decreases to 4.2 divisions.
d. CHECK— Generator output frequency is between 8.5
and 11.5 MHz.
e. Disconnect the test equipment from the instrument.
4. Check Com m on-Mode Rejection Ratio
a. Set:
BW LIMIT Off (button out)
CH 2 VOLTS/DIV 10 mV
INVERT On (button in)
b. Connect the leveled sine-wave generator output via a
50-52 cable, a 50-52 termination, and a dual-input coupler to
the CH 1 OR X and the CH 2 OR Y input connectors.
c. Set the generator to produce a 25-MHz, 6-division
display.
d. Vertically center the display using the Channel 1 POSI­
TION control. Then set the VERTICAL MODE switch to CH
2 and vertically center the display using the Channel 2 PO­
SITION control.
e. Set the VERTICAL MODE switches to BOTH and
ADD.
f. CHECK— Display amplitude is 0.6 division or less.
g. If the check in part f meets the requirement, skip to
part p. If it does not, continue with part h.
h. Set the VERTICAL MODE switch to CH 1.
i. Set the generator to produce a 50-kHz, 6-division
display.
j. Set the VERTICAL MODE switch to BOTH.
k. Adjust the CH 1 or CH 2 VOLTS/DIV Variable control
for minimum display amplitude.
I. Set the VERTICAL MODE switch to CH 1.
m. Set the generator to produce a 25-MHz, 6-division
display.
n. Set the VERTICAL MODE switch to BOTH.
4-5