Fluke PM3082 Service Manual page 444

6 - 18
settings/procedure PM3092 and PM3082:
1 - Apply a fast rise time (£ 1 ns) signal of 1V (into 50Q), frequency 1 MHz, to inputs CH1 and CH3.
Generator in 'edge' mode.
Use a power splitter and two cables of equal length to CH1 and CH3.
2 - Press the AUTOSET key.
3 - Use 500 terminations.
4 - Set CH1 and CH3 to 0.1 V/div and input coupling to DC.
5 - Press 10x MAGN key and set MTB to 2 ns (PM3092) or to 5ns (PM3082).
6 - Press menukey TRIGGER MTB.
7 - Select level-pp 'off' and 'dc' trigger coupling in the belonging menu.
8 - Press menukey TB MODE.
9 - Select 'trig' in the belonging menu.
10 - Adjust LEVEL MTB for a triggered display of the leading edge.
11 - Position the rising edges of the signals in the horizontal center of the screen, by means of the
X POS and LEVEL MTB control.
12 - Adjust the two traces between the dotted lines 0% and 100% by means of the CH1 and CH3
POS controls so that both signals cover each other.
requirements:
Verify that the delay difference between the two displayed signals is less than 0.5 ns: this equals
0.25 divisions in PM3092 or 0.1 divisions in PM3082.
Repeat settings/procedure for CH1 and CH4.
Figure 6.8 Delay difference < 0.25 div in PM3092 or <0.1 div in PM3082.
6.3.22 Horizontal deflection; display modes and trace separation
The correct working of main timebase (MTB), delayed timebase (DTB) and the TRACE
SEPARATION is checked.
test equipment:
Fluke 5500A mode: wavegen, wave sine (Alternative: function generator, PM5136)
PERFORMANCE TEST