Horizontal Deflection; Delay Time Multiplier - Fluke Autoranging CombiScope PM3370B Service Manual

PERFORMANCE TEST
Requirements for analog mode MAGNIFY off (
DEL'D TB setting
500 µs
20.0 µs
5.00 µs
1.00 µs
500 ns
100 ns
50.0 ns
20.0 ns (PM3390B/94B)
Requirements for analog mode MAGNIFY on (
DEL'D TB setting
100 ns
10.0 ns
5.00 ns
2.00 ns (PM3390B/94B)

6.3.28 Horizontal deflection; delay time multiplier

In this test the minimum and maximum delay time is checked.
Test equipment:
None
Settings/procedure and requirements:
1 - Press the AUTOSET key.
2 - Press the DTB menu key and select DEL'D TB 'on' and MAIN TB 'on' from the appropriate
menu .
3 - Set MAIN TB to 500 ns.
4 - Set DEL'D TB to 50.0 ns.
5 - Separate the MAIN TB and DEL'D TB traces with the TRACK control.
6 - Adjust the delay time to 500.0 ns using of the DELAY control (in the DELAYED TIMEBASE
section).
7 - Adjust the start of the MAIN TB display exactly on the first graticule line by using the X POS
control (at maximum TRACE INTENSITY).
8 - Verify that the difference between the start of MAIN TB and the start of the intensified part is
between 0.9 to 1.1 divisions.
Adjust the delay time to 5.00 µs with the DELAY control (in the DELAYED TIMEBASE section).
9 -
10 - Verify that the difference between the start of MAIN TB and the start of the intensified part is
between 9.9 and 10.1 divisions.
1):
*
MAIN TB setting
500 µs
20.0 µs
5.00 µs
1.00 µs
500 ns
100 ns
50.0 ns
20.0 ns
10):
*
MAIN TB setting
100 ns
10.0 ns
5.00 ns
2.00 ns
Marker pulse Max. error
0.5 ms 1.8%
20 µs
1.8%
5 µs
1.8%
1 µs
1.8%
0.5 µs 1.8%
0.1 µs
1.8%
50 ns 1.8%
20 ns 1.8%
Marker pulse Max. error
0.1 µs
2.3%
10 ns 2.3%
5 ns 3.3%
2 ns 3.3%
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