Fluke 867B User Manual page 49

2
Making Measurements
Testing for Logic Activity
Using the Logic Test Softkeys
3 V 5 V /
TTL CMOS CMOS
1, 2, and 3 select the trigger point for the
logic activity indicator and frequency reading. "5V
CMOS" is the standard configuration. A new
selection cancels the old selection. See Chapter 8
for threshold values.
4 (/) activates the beeper; a beep then sounds
to indicate logic activity. The beeper is off in the
standard configuration. If the reading goes above 30
volts, the safety indicator (l) lights.
2-21