Tektronix 2440 User Manual page 162

Performance Check and Functional Verification Procedure
2440 Service
m. Select TRIGGER SO U RC E and push the EXT menu
button. Set A and B EXT GAIN to EXT 1-j-5 on in the
menu displayed.
Trigger
Test
System Frequency
A 60 Hz
B 60 Hz
A
30 kHz
B 30 kHz
A 80 kHz
B 80 kHz
A 50 kHz
B 50 MHz
A
300 M Hz'
B 300 M Hz'
*Not necessary to check.
bNot triggered at specified amplitude.
eAt frequencies above 100 M Hz, it may be necessary to adjust the LEVEL control for a stable trigger and to make the display visible.
4-20
Table 4-4
Minimum Signal Level for EXT1 or EXT2 Triggering
(in millivolts)
VOLTS
SEC/
DIV/ DIV
Setting
Setting
5 mV
10 ms
5 mV
10 ms
5 mV
20 p.s
5 mV
20 ps
10 mV
10 p.s
10 mV
10 | A S
10 mV
20 ns
10 mV
20 ns
50 mv 2 ns
50 mV
2 ns
n. Select TRIGGER CPLG and repeat part j to check A
EXT 1-i-5 coupling,
TRIGGER COUPLING
AC
DC
17.5
17.5
35.0
35.0
17.5
17.5
35.0
35.0
17.5 17.5
35.0 35.0
17.5
17.5
35.0
35.0
50.0
50.0
100.0
100.0
NOISE REJ
HF REJ
LF REJ
a
a
(17.5)b
a a
(35.0)b
a
25
a
50
a
a
a a
60
(60)b
120 (120)b
150
(150)b
300 (300)b 100
a
a
25
50
25
50
50