Fluke 189 - Manual (Page 54)

Model 187 & 189
Users Manual
3-18
The following are some tips for measuring current:
•
If the display shows LEAd5 and you are sure the
meter is set up correctly, test the meter’s fuses as
described under "Testing the Fuses" in Chapter 6.
•
A current meter drops a small voltage across itself,
which might affect circuit operation. You can calculate
this burden voltage using the values listed in Chapter
7 under Burden Voltage (A, mA, µA).
Measuring AC Current
To measure ac current, set up the meter as shown in
Figure 3-11.
The blue pushbutton cannot be used with ac current
measurement. All other pushbutton features can be used.