Fluke PM3082 Service Manual page 443

PERFORMANCE TEST
Test set up:
5500A
Settings/procedure PM3092, PM3094, PM3082, PM3084:
1 - Apply a square-wave signal with a fast rise time of less than 1 ns, and an amplitude of 1V (into
50Q), with a frequency of 1 MHz, to inputs CH1 and CH2. The generator must be set in the
'edge' mode.
Use a power splitter and two cables of equal length to CH1 and CH2.
2 - Press the AUTOSET key.
3 - Use 500 terminations. Use the internal terminations when available.
4 - Set CH1 and CH2 to 0.1 V/div and input coupling to DC.
5 - Press the 10x MAGN key and set the MTB to 2 ns/div (PM3092, PM3094) or to 5ns /div
(PM3082, PM3084).
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 - Using the X POS and LEVEL MTB control, position the leading edges of the signals in the
horizontal center of the screen.
12 - Using both CH1 and CH2 POS controls, adjust the vertical position of each trace between the
dotted 0% and 100% lines. The signals appear to be superimposed.
Requirements
Verify that the delay difference between the two displayed signals is less than 0.25 ns.
This equals 0.13 divisions in PM3092 and PM3094 or 0.05 divisions in PM3082 and PM3084.
Repeat the above settings and procedure for CH3 and CH4.
Figure 6.7 Delay difference <0.13 div in PM3092/94 or < 0.05 div in PM3082/84.
OSCILLOSCOPE UNDER TEST
6 - 1 7