Ch 3 And Ch 4 Vertical Bandwidth; Ch 1 And Ch 2 Aberrations; Ch 1 And Ch 2 A Be Rratio N S; Scope Bw (Bandwidth Limit) Accuracy - Tektronix 2246 1Y Service Manual

c. Set the Leveled Sine-Wave Generator output for
a six-division signal amplitude at 50 kHz.
d. Set the generator
Frequency Variable controls for a 100 MHz output
signal.
e. CHECK—the displayed signal amplitude is 4.2
divisions or more.
f. Repeat the frequency setup and CHECK pro­
cedure for VOLTS/DIV settings of 50 mV and
0.5 V.
g. Move the test signal to the CH 2 input.
h. Set:
Vertical MODE
CH 2 VOLTS/DIV
i. Repeat the complete Bandwidth check procedure
for Channel 2.

17. CH 3 and CH 4 Vertical Bandwidth

a. Set:
Vertical MODE
CH 3 and CH 4 VOLTS/DIV
b. Connect leveled sine-wave generator (SG
output to the CH 3 input via a
coaxial cable and a
c. Set the generator output for a six-division signal
display at 50 kHz.
d. Set the generator Frequency Range and Fre­
quency Variable controls for a 100 MHz output
frequency.
e. CHECK—that the signal display amplitude is 4.2
divisions or more.
f. Repeat the procedure for 0.5 VOLTS/DIV setting.
g. Move the test signal to the CH 4 input.
h. Set Vertical MODE to CH 4 (CH 3 off).
i. Repeat the procedure for CH 4.
j. Disconnect the test setup.
REV OCT 1991
Performance Check Procedure—2246 1Y and 2246 Mod A Service
Frequency Range and
CH 2 (CH 1 off)
5 mV
CH 3 (CH 2 off)
0.1 V
503)
5 0 -n precision BNC
5 0 -n
BNC termination.

18. CH 1 and CH 2 Aberrations

a. Set:
VERT MODE
CH 1 VOLTS/DIV
CH 1 COUPLING
A SEC/DIV
b. Connect calibration generator (PG 506) FAST
RISE -J~ output to the CH 1 input via a 10X, 5 0 -fl
attenuator, a 5 0 -n precision BNC coaxial cable,
and a 50-X1 BNC termination.
c. Position top of waveform to 100% graticule mark­
ing.
d. Adjust calibration generator PULSE AMPLITUDE
for five divisions of signal display.
e. CHECK—that aberrations are SO.25 division,
peak-to-peak.
f. Repeat steps c. through e. for VOLTS/DIV set­
tings of 10 mV through 0.2 V. Remove the 10X,
5 0 -n
attenuator when necessary to maintain a
five-division display.
g. Repeat the procedure for CH 2.
h. Disconnect the test setup.

19. SCOPE BW (Bandwidth Limit) Accuracy

a. Set:
Vertical MODE
CH 1 VOLTS/DIV
SCOPE BW
A SEC/DIV
b. Connect leveled sine-wave generator (SG 503)
output to the CH 1 input via a 50-11 precision BNC
coaxial cable and a 5 0 -n BNC termination.
c. Set leveled sine-wave generator (SG 503) output
for a six-division signal amplitude at 50 kHz.
d. Set the leveled sine-wave generator Frequency
Range and Frequency Variable controls to pro­
duce a signal display amplitude of 4.2 divisions.
e. CHECK—that the sine-wave generator output fre­
quency is between 17 MHz and 23 MHz.
f. Disconnect the test setup.
CH 1 (CH 4 off)
5 mV
DC
20ns
CH 1 (CH 2 off)
10 mV
On
0.1 ms
4-11