PERFORMANCE TEST
4 - 53
Measuring oscilloscope:
-
Apply the coaxial cable from signal ‘MTB GATE’ of the oscilloscope under test
to input CH1 of the measuring oscilloscope.
-
Apply the coaxial cable from signal ‘DTB GATE’ of the oscilloscope under test
to input CH2 of the measuring oscilloscope.
-
Press the green AUTOSET key.
-
Adjust CH1 and CH2 to DC input coupling; if the ocilloscope is in 50
Ω
(‘LZ’)
position, select an input impedance of 1M
Ω
.
-
Adjust CH1 and CH2 to 2 V/div.
-
Select 2 ms/div for MTB.
Requirements:
-
Verify that two square-wave signals are displayed via CH1 and CH2 of the
measuring oscilloscope.
-
Verify that the ‘low’ level of both square-waves is between 0 .. 0.4 V.
-
Verify that the ‘high’ level of both square-waves is between 2.4 .. 5 V.
-
Verify that the ‘MTB GATE’ signal (is displayed via CH1) is high during 10 ms
or more.
-
Verify that the ‘DTB GATE’ signal (is displayed via CH2) is high during 1 ms
or more.
Y-OUTput signal
Test equipment: Fluke 5500A mode: levsine (Alternative: constant amplitude
sine-wave generator SG503).
Test set up:
Settings/procedure:
-
Apply a 50 kHz sine-wave signal of 600 mV (pp into 50
Ω)
to input CH1 and
press the green AUTOSET key.
-
Use external 50
Ω
termination at the CH1 input. Use the internal termination of
the oscilloscope, when available (if active, the text ‘LZ’ is visible in the lower
part of the viewing area).
-
Set CH1 to 0.1 V/div.