Fluke 80i400 schematic

Limited Warranty & Limitation Of Liability

Each Fluke product is warranted to be free from defects in material
and workmanship under normal use and service. The war r a nty
period is one year and begins on the date of shipment. Parts, product
repairs and services are warranted for 90 days. This warranty extends
only to the original buyer or end-user customer of a Fluke authorized
reseller, and does not apply to fuses, disposable batteries or to any

product which, in Fluke’s opinion, has been misused, altered,
neglected or damaged by accident or abnormal conditi ons of
operation or handling. Fluke warrants that software will operate
substantially in accordance with its functional specifications for 90
days and that it has been properly recorded on non-defective medi a.
Fluke does not warrant that software will be error free or operate
without interruption.

Fluke authorized resellers shall extend this warranty on new and
unused products to end-user customers only but have no authority to
extend a greater or different warranty on behalf of Fluke. Warranty
support is available if product is purchased through a Fluke
authorized sales outlet or Buyer has paid the applicable international
price. Fluke reserves the right to invoice Buyer for importation costs
of repair/replacement parts when product purchased in one country is
submitted for repair in another countr y .

Fluke’s warranty obligati on is limited, at Fluke’s option, to refund of
the purchase price, free of charge repair, or replacement of a
defective product which is returned to a Fluke authorized service
center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized
service center or send the product, with a description of the difficulty,
postage and insurance prepaid (FOB Destination), to the nearest
Fluke authorized service center. Fluke assumes no risk for damage
in transit. Following warranty repair, the product will be returned to
Buyer, transportation prepaid (FOB Destination). If Fluke determines
that the failure was caused by misuse, alteration, accident or
abnormal condition of operation or ha ndling, Fluke will provide an
estimate of repair costs and obtain authorization before commencing
the work. Following repair, the product will be returned to the Buyer
transportation prepaid and the Buyer will be billed for the repair and
return transportation charges (FOB Shipping Point).

Instruction Sheet

80i-400

AC Current Probe

Introduction

The Model 80i-400 is a clamp-on ac current probe designed to
extend the current measuring capability of an ac current meter
to 400 amperes. A clamp-on, 1000-turn coil designed into the
probe allows measurements to be made without breaking the
circuit under test. The coil serves as the secondary of a current
transformer. The current carrying conductor being measured
serves as the primary.

Electrical Symbols

W See explanation in manual.

Double insulation for protection against electric
shock.

Specifications

Input Current Range:
Output:

1 milliamp per ampere of input current (1mA/A)

1A to 400A

®

THIS WARRANTY IS BUYER’S S O LE AND E X CLUS IVE REMEDY AND
IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLI ED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, WHETHER ARISING FROM BREACH OF
WARRANTY OR BASED ON CONTRACT, TORT, RE LIANCE OR ANY
OTHER THEORY.

Since some countries or states do not allow limitation of the term of
an implied warranty, or exclusion or limitation of incidental or
consequential damages, the limitations and exclusions of this
warranty may not apply to every buyer. If any provision of this
Warranty is held invalid or unenforceable by a court of competent
jurisdiction, such holding will not affect the validity or enforceability
of any other provi s ion.

For application or operation assistance or information on Fluke
products, call:

800-44-FLUKE (800-443-5853) in U.S.A. and Canada
34 40 267-8200 in Europe
206-356-5500 from other countries

Fluke Corporati on Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett WA 5602 B.D.
98206-9090 Eindhoven,

The Netherlands

PN 735191
June 1984 Rev. 6, 12/96

© 1984,1994,1996 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

Accuracy:

±(3% + 0.4A) 48 Hz to 440 Hz

±(4% + 0.4A) 440 Hz to 1000 Hz

Working Voltage:
Output Cable Isolation:

600V ac rms maximum

The output cable may be
connected directly to a grounded input or floated to a 42V dc
or 30V ac rms maximum from earth ground.

Output Cable Length:
Maximum Conductor Size:

5 ft (152 cm).

1 ea. 750 MCM (30 mm
(1.18" diameter) or 2 ea. 500 MCM (25 mm (0.98") diameter)
or 2.5" x 0.2" Bus Bar (65 mm x 5 mm) (0.98")

Shunt (load) Resistance: less than 12 ohms at multimeter
input to maintain specified accuracy

Typical Bandwidth: -10% at 40 Hz and 5 kHz (1A, 400 Hz
reference, excludes multimeter response)

Usable Current Range: 0.1A to 600A, 5 seconds maximum
above 400A

Safety: Complies with EN 61010-1 August 1993

Multimeter Compatibility

The 80I-400 is compatible with any multimeter capable of
reading ac current equal to 1/1000 of the current to be
measured, and equipped with input jacks compatible with
Fluke safety-designed test lead connectors. To take full

advantage of the probe‘s accuracy, a multimeter ac current
accuracy of ±0.75% or better is recommended. A voltmeter
fitted with an external shunt will qualify as a suitable current
meter. However, to ensure the probe’s accuracy, the shunt (or
multimeter input resistance in ac current) should be less than
12 ohms. This requirement is met on Fluke DMMs when using
a current range of 20 mA or greater.

When making a measurement, the current-carrying conductor
is not broken, and remains electrically isolated from the
current meter input terminals. As a result, the current meter’s
INPUT LO or COM terminal may be either floated (isolated)
or grounded.

Meter Readings

When the 80i-400 is connected to a compatible current meter
and clamped around a single current-carrying conductor, the
meter reading will be 1/1000th of the actual current in the
conductor. For example, a 5-ampere (A) input current will be
transformed into a 5-milliampere (mA) output current (see
Figure 1).

When measuring current in an ac line cord, the jaws should be
clamped around only one conductor (the black or hot wire in a
three-wire cord). If the jaws are clamped around both current
carrying conductors, the currents will cancel and produce a
zero reading.

If the probe is clamped around two wires carrying current in
the same direction, the sum will be read. Reversing one of the
wires causes the difference to be read.

Low-Level Current Measurements

The 80i-400 AC Current Probe is specified to measure
currents of 1A or greater. Currents less than 1A will produce

meter readings that are below the true value. Low-level
currents can be measured by looping the input wire through the
jaws so that the sum of the current thro ugh the jaws is greater
than 1A. The actual current can then be calculated by dividing
the meter reading by the number of turns looped through the
jaws.

For example, to m easure a cu rrent of 400 m A (0.4A ), form a 10­turn loop and clam p the jaws of the 80i- 400 aroun d all 10 tu rns.
The meter reading will be 4 mA, wh ich corresponds to a primary
current of 4A. The actual current in the con ductor is 4A divided
by 10-turns, or 400 mA.

Note

The range selection on the meter should always be 20
mA or greater (12 ohm shunt or lower). Lower
ranges with higher shunt values will cause reading
errors.

Operation

1. Connect the 80i-400 output connectors between the

common and the appropriate current input jack of a
suitable meter, then switch the meter on.

Note

Refer to Table 1 to determine the appropriate input

jack and proper function setting for use with a Fluke
handheld DMM.

2. Select a 20 mA ac or greater current range.

3. Clamp the probe around the current-carrying conductor to

be measured (see Figure 1). Make sure the probe jaws are
tightly closed around the conductor. The probe is
designed for highest accuracy when the conductor is
centered on the jaw alignment marks.

4. Multimeter readings displayed in milliamps (mA) can be

read directly as amperes of input current. Readings
displayed in amperes (A) must be multiplied times 1000
to obtain the amperes of input current.

Single Current

Carrying Conductor

320 mA

320 A

AC Current Function

300 mA Range

Figure 1. Typical 80i-400 Using a Typical Meter

300mA COM

Red

AC

A

Black