Fluke 28IIEX User Manual page 42

28 II Ex
Users Manual
Table 7. Functions and Trigger Levels for Frequency Measurements
Function Range
 6 V, 60 V,
600 V, 1000 V
 600 mV

600 mV
V 6 V
V 60 V
V 600 V
V 1000 V

All ranges

A
600 A, 6000 A
60 mA, 400 mA

A
6 A, 10 A
32
Approximate
Trigger Level
5 % of scale Most signals.
30 mV High-frequency 5 V logic signals. (The dc-coupling of the L function can
attenuate high-frequency logic signals, reducing their amplitude enough to
interfere with triggering.)
40 mV Refer to the measurement guidelines given before this table.
1.7 V 5 V logic signals (TTL).
4 V Automotive switching signals.
40 V Refer to the measurement guidelines given before this table.
100 V
Frequency counter characteristics are not available or specified for these functions.
5 % of scale AC current signals.
30 A , 300 A Refer to the measurement guidelines given before this table.
3.0 mA , 30 mA
.30 A, 3.0 A
Typical Application