6
HALO FORKHEAD INSTRUCTIONS
(Models 8281 and 9391)
The operational performance of the forkhead is the
same as the hookhead, but offers a slightly different
approach in obtaining current measurements. All
safety concerns that apply to the hookhead apply to
the forkhead. The positioning of the instrument with
respect to the conductor and the positioning of the
conductor within the forkhead is critical in obtaining
an accurate reading. To obtain the most accurate
reading, the following guidelines should be observed.
1. Be sure the HALO body is perpendicular (90°) to the
conductor (reference Figures 3, 4, 5 and 6 on page 5).
2. If there are other conductors in close proximity,
face the opening of the fork away from the other
conductor(s) as much as possible.
3. Position the forkhead so the conductor is close to, or
pressed against, the base of the fork and is centered
between the legs of the fork (See Figure 8).
4. Keep the opening of the forkhead perpendicular
to the conductor (See Figure 9).
WARNING
- Do not bridge the HALO from energized line to ground or from line to line.
NOTE
- When using the forkhead on underground systems near the elbow, the concentric
neutral cannot be inside the forkhead for the unit to perform properly. Position the forkhead
around the conductor where the concentric neutral is peeled back. This is usually high on
the cable, just below the elbow or on the elbow below the pulling ground.
SPECIFICATIONS AND DIMENSIONS
Display:
3.5 digit LCD 1⁄2” (13mm) high characters
Measurement Range:
0.1 to 199.9 amps low range - 199.9 to 1,999 amps high range
Accuracy:
+/- 3% of r/- 3 counts
Operating Temperature:
0°F to 122°F (-18°C to 50°C)
Storage Temperature:
0°F to 122°F (-18°C to 50°C)
System Voltage:
Up to 69,000 volts AC
Operating Frequency:
25-1000Hz
Maximum Hook Opening:
2.3” (5.8cm)
Maximum Hook Depth:
3.7” (9.4cm)
Outside Fork Dimension:
5.5”W x 8.5”L x 1.1875” Thick (14cm x 22cm x 3cm)
Inside Fork Dimension:
2.75”W x 5.5” Deep (7cm x 14cm)
Overall Length:
28” (71cm)
Tube Dimensions:
18” x 1-3⁄4” (45.7cm x 4.5cm) diameter
Weight:
2lbs. 13oz. (1.28 kg)
*Specifications subject to change without notice
Figure 8
Figure 9
