3
NOTE - PRIOR TO USE, THIS MANUAL SHOULD BE FULLY READ AND UNDERSTOOD.
GENERAL
HALO is a high-current, digital ammeter designed to be used on system voltages up to
69,000 volts AC. The HALO ammeter will sense and display current to 1,999 amps and
will hold the maximum reading and/or track the reading for the user.
HALO was designed for the purpose of measuring current flow on overhead lines and/or
underground systems. When using the HALO, a hotstick must be used at all times and
rigorous hotstick work precautions must be followed. When used correctly, HALO can
enable fast, accurate and safe load surveys and load balance investigations.
The instrument is constructed of durable materials and will require a minimum
of maintenance. However, regular examinations are needed to ensure that no
deep scratches or physical damage has occurred. If damage does occur, remove
from service and arrange for repair.
The HALO has 4 models, HALO I HOOKHEAD and FORKHEAD has one mode (Hold).
HALO II HOOKHEAD and FORKHEAD has two modes of operation (Track and Hold).
The opening in the head is large enough to accept all sizes of wire conductors.
SAFETY
As HALO is often used on and in the vicinity of high voltage equipment, please practice
the following safety precautions.
1. Before use, make certain that:
A. Operating instructions are read, understood and questions answered.
B. Rigorous hotstick work precautions are followed.
C. Industry and/or company standard safety practices are followed.
D. All parts of the equipment are dry, clean, properly secured together & in working order.
E. The equipment set-up is correct for the voltage system to be monitored.
2. During the use of the unit, make certain that:
A. Correct hotsticks are installed for the system voltage being tested.
B. Hands are kept only on the insulated handle section of the hotstick & not on the HALO!
C. Electrically safe, insulated rubber gloves are used at all times on the hotstick.
D. The HALO is not an insulator. Do not bridge the HALO from energized line to ground
or from line to line.
DESCRIPTION OF EQUIPMENT
See Page 7 for a brief overview of the HALO’s features and operating procedures.
The HALO instrument has a molded sensing coil in the head and a 3.5 digit LCD display.
The HALO measures current between 0 and 1,999 amperes. The HALO is autoranging,
providing a reading between 0 to 199.9 on the low range and 200 to 1999 on the high
range. When in the HOLD mode, the display will lock in at the highest current monitored
on the conductor. If an over-range condition exists (above 1,999 amps), the display will
show a 1. Reset display prior to using again.
