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PERFORMANCE TEST
4.3.24
Horizontal deflection; MAIN TB deflection coefficients
The deflection coefficients of the main timebase generator (MAIN TB) are verified
by means of a calibration signal.
Test equipment:
Fluke 5500A mode: marker (Alternative: time marker generator TG 501).
Test set-up:
Settings/procedure:
1
-
Apply a 50.0 ns time marker signal to input CH1.
2
-
Press the AUTOSET key.
3
-
Use a 50
Ω
termination. For instruments with switchable 50
Ω
input
impedance it is recommended to make use of this feature (via
VERT MENU key).
4
-
Press the TRIGGER menu key.
5
-
Select level-pp ’off’ and ’dc’ from the TRIGGER MAIN TB menu.
6
-
Press the TB MODE menu key.
7
-
Select ’trig’ from the TB MODE menu.
8
-
Adjust the TRIGGER LEVEL control for a correctly triggered display.
9
-
Verify the deflection coefficients of MAIN TB with MAGNIFY off (
*
1) and
MAGNIFY on (
*
10) according to the requirements in the tables. Use the
deflection error facility of the time marker generator.
Note:
-
Error limits must be measured between the 2nd and the 10th graticule line
(there are 11 graticule lines). These are the central 8 divisions.
-
With MAGNIFY on (
*
10), the central 10 divisions of the expanded 100
divisions of MAIN TB are measured.