Basic Measurements; Hazardous Voltage Indicator; Field Sense Measurement; Field Sense Ac Current, Voltage, And Frequency - Fluke 377 Manual

377/377 FC/378/378 FC
Users Manual

Basic Measurements

Before you use the Clamp for the first time, remove the battery
isolator between the batteries and battery contacts.
XW Warning
To prevent possible electrical shock, fire, or
personal injury:
• Hold the Product behind the tactile barrier.
• Do not measure current while the test leads are
in the input jacks.

Hazardous Voltage Indicator

When the Clamp senses a voltage ±30 V or a voltage overload
Z
(OL), shows on the display to tell you a hazardous voltage is at
the Clamp input.

Field Sense Measurement

Field Sense, or Non-contact voltage (NCV) measurement, is ac
voltage, current, and frequency measurement with no electrical
contact to live voltage. The Clamp display shows the voltage and
current measurements at the same time.
All Field Sense measurements require a ground lead
connection.

Field Sense AC Current, Voltage, and Frequency

To make the measurement:
1. Insert the ground lead into the COM input and attach the
alligator clip to ground.
2. Rotate the control knob to
U
The display shows the
3. Use the jaw release to open the jaw and position the Clamp
around the conductor. Close the jaw and make sure the wire
position is correct. See Figure 2.
12
Note
U
.
icon.
Figure 2. Wire Placement
L1 L2
C
The display shows to indicate that the measurement is
from the jaw. When the current measurement is <0.5 A, the
center dot in the icon flashes. For current measurements
>0.5 A, the center dot in the icon is steady.
Note
B
Use to toggle on/off the Hz function shown in
yellow at the control knob position.
3.3 mm Ø
8.2 mm Ø
L3
34 mm Ø