BRIEF CHECKING PROCEDURE
3 - 7
TRIG VIEW channel and EXT TRIG in PM3370B, PM3380B or PM3390B:
-
Connect a probe to the EXT TRIG input and PROBE ADJUST.
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Press the EXT TRIG key.
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Press the TRIG VIEW key. Switch CH1 or CH2 off if they are on.
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Adjust the AMPL key in the EXT TRIG section to an input sensitivity of 1.00V.
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Check for a display as shown in fig. 3.7.
-
Press the EXT TRIG key and check that the displayed square-wave starts with
a negative-going slope.
-
Press the EXT TRIG key and check that the display as shown in fig. 3.7. is
obtained again.
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Press the AC/DC key in the EXT TRIG section so that dc input coupling (=) is
obtained.
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Check for a display as shown in fig. 3.8.
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Press the ANALOG key to switch the instrument back to analog mode
("ANALOG MODE’ appears briefly).
-
CH... 1.00V
MTB 100
µ
s
ST6650
Figure 3.7
Figure 3.8
CH... 1.00V
MTB 100
µ
s
ST6652