
®
 
Instruction Sheet 
i5s AC Current Clamp 
Introduction 
The i5s (hereafter called the “Current Clamp”) is compatible with any instrument that can accept 
a standard BNC connector and is capable of ac millivolt measurements; the Current Clamp can 
also be used with digital multimeters using a BNC-to-dual banana plug adapter. The Current 
Clamp produces an output of 400 mV ac per 1 A ac input level. 
Contacting Fluke 
To contact Fluke, call one of the following telephone numbers: 
 USA: 1-888-44-FLUKE (1-888-443-5853) 
 Canada: 1-800-36-FLUKE (1-800-363-5853) 
 Europe: +31 402-675-200 
 Japan: +81-3-3434-0181 
 Singapore: +65-738-5655 
 Anywhere in the world: +1-425-446-5500 
 USA Service: 1-888-99-FLUKE (1-888-993-5853) 
Or, visit Fluke's Web site at www.fluke.com. 
To register your product, visit register.fluke.com 
Safety Information 
XW Read First: Safety Information 
To ensure safe operation and service of the Current Clamp, follow these instructions: 
•Read the operating instructions before use and follow all safety instructions. 
•Use the Current Clamp only as specified in the operating instructions, otherwise the 
clamp’s safety features may not protect you. 
•Adhere to local and national safety codes. Individual protective equipment must be 
used to prevent shock and arc blast injury where hazardous live conductors are 
exposed. 
•Do not hold the Current Clamp anywhere beyond the tactile barrier, see Figure 1. 
•Before each use, inspect the Current Clamp. Look for cracks or missing portions of the 
clamp housing or output cable insulation. Also look for loose or weakened 
components. Pay particular attention to the insulation surrounding the jaws. 
•Never use the Current Clamp on a circuit with voltages higher than 600 V CAT III. 
•CAT III equipment is designed to protect against transients in equipment in fixed 
equipment installations, such as distribution panels, feeders and short branch circuits, 
and lighting systems in large buildings. 
•The Clamp is designed for use on insulated conductors only. Use extreme caution when 
working around bare conductors or bus bars. Contact with the conductor could result in 
electric shock. 
•Use caution when working with voltages above 
60 V dc or 30 V ac rms. Such voltages pose a shock hazard. 
Symbols 
-Do not apply around or remove from HAZARDOUS LIVE conductors. 
TProduct is protected by double insulation. 
WRisk of Danger. Important information. See Instruction Sheet. 
XRisk of Electric Shock. 
)Canadian Standards Association has certified that the product meets applicable U.S. 
and Canadian Standards. 
PConforms to relevant European Union directives. 
 
 
 
PN 2458104 May 2005 
© 2005 Fluke Corporation. All rights reserved. 
All product names are trademarks of their respective companies. 
Safety Specifications 
Category Rating: CAT III 600 V per IEC/EN61010-1, Pollution Degree 2 
EMC: EN 61326-1, FCC for emission and immunity 
)Complies with U.S. and Canadian Standards CAN/CSA C22.2 No. 61010-1-04 and 
No. 61010-2-032-04; UL61010-1 
PIEC 61010-1 2nd Edition IEC 61010-02-032 
Electrical Specifications 
Reference Conditions: 23 ± 5 °C, 20 to 75 % RH; conductor centered in jaw opening; 
no DC component; no adjacent conductor. 
Measurement Range: 10 mA to 6 A 
Output: 400 mV/A 
Accuracy (48 Hz to 65 Hz): 
10 mA to 1 A 1% + 5 mA 
1 A to 5 A 1% 
Phase Shift (48 Hz to 65 Hz): 
10 mA to 100 mA Unspecified 
100 mA to 5 A 4 ° 
Crest Factor: ≤3, add 0.7 % to accuracy 
Typical Bandwidth: 40 Hz to 5 kHz 
Working Voltage: 600 V ac rms, in compliance with EN61010 
Common Mode Voltage: 600 V ac rms from earth ground, in compliance with EN61010 
Input Load Impedance (of host instrument): >1 M Ωin parallel with up to 47 pF 
Maximum Non-destructive Current: 70 A 
Duty Cycle: 0.01 A to 6 A continuous 
Influence of Adjacent Conductor: ≤15 mA/A (@ 50/60 Hz) 
Influence of Conductor Position in Jaw Opening: ±0.5 % of reading (@ 50/60 Hz) 
General Specifications 
Output Cable Length: 2.5 m 
Maximum Conductor Size: 15 mm 
Storage Temperature: -20 °C to 60 °C 
Operating Temperature: 0 °C to 50 °C 
Relative Humidity: 10 °C to 30 °C: 85 % 
 30 °C to 40 °C: 75 % 
 40 °C to 50 °C: 45 % 
Temperature Coefficient: 0.01 % X (specified accuracy)/ °C 
(< 18 °C or > 28 °C) 
Altitude: Operating: 2000 m; Non-operating: 12000 m 
Dimensions: 116 x 43 x 23 mm 
Weight: 200 g 
Instrument Compatibility 
The Current Clamp is compatible with any Fluke Multimeter or any other current measurement 
device that has the following features: 
•BNC or Banana inputs 
•Input accuracy of 1 % or better to take full advantage of the accuracy of the Current Clamp. 
•Input impedance of > 1 M Ωin parallel with up to 47 pF 
Note 
Current input impedance on the Fluke 430 Series Three-Phase Power Quality Analyzer is 
< 1 MΩ, but it has a special calibration setting for the i5s to achieve full accuracy. 
Measurement Considerations 
•Center the conductor inside the Current Clamp jaw. 
•Make sure the Current Clamp is perpendicular to the conductor. 
•For optimal reading, make sure the conductor is centered in the jaws of the Current 
Clamp. 
Observe the following guidelines when making measurements: 
•Avoid taking measurements close to other current-carrying conductors. 
Operation 
To use the Current Clamp, refer to “Measurement Considerations” and Figure 1: 
1. If necessary, add a dual banana plug to BNC adapter to the i5s BNC connector. 
2. Connect the clamp cable to the instrument. If using an adapter, use the common and 
volts inputs of the meter and switch it on. 
3. Make sure the measurement instrument is set to the proper range. 
4. Make sure the arrows on each side of the Current Clamp face towards the load of the 
circuit. 
5. Open the Current Clamp jaw by pushing the release button toward the jaw until the latch 
has cleared the barrier, then press down to open the jaw. 
6. Connect the Current Clamp jaws around the insulated conductor to be measured and 
release the button. Ensure that the release button has returned to the original position to 
resume the circuit testing. 
XW Warning 
To avoid shock or personal injury, keep fingers behind the tactile barrier, see Figure 1. 
Single Insulated 
Current Carrying 
Conductor
600V CAT III
i5s
AC CURRENT CLAMP
SERIAL NUMBER
Tactile Barrier
Load Direction
Arrow
BNC Connector
Banana
Plug
Release
Button
 
cab01f.eps 
Figure 1. i5s Setup 
Maintenance 
XW Warning 
To avoid possible electric shock or personal injury: 
•Before each use, inspect the Current Clamp. Look for cracks or missing portions of the 
clamp housing and output cable insulating cover and for loose or weakened components. 
Pay particular attention to the insulation surrounding the clamp jaws. 
•Do not use a damaged Current Clamp. If a clamp is damaged, tape it shut to prevent 
unintended operation. A damaged clamp under warranty will be promptly repaired or 
replaced (at Fluke’s discretion) and returned at no extra charge. 
If the Current Clamp does not work or perform properly, use the following steps to help isolate 
the problem: 
1. Inspect the jaw mating surface for cleanliness. If any foreign material is present, the jaw will 
not close properly and measurement errors will result. 
2. Verify that the function selection and range on the Multimeter are correct and adjusted to the 
sensitivity of the Current Clamp. 
Cleaning 
Periodically wipe the case with a damp cloth and mild detergent. 
WCaution 
To avoid damaging the Current Clamp, do not use abrasives or solvents to 
clean the clamp. 
Open the jaws and wipe the magnetic pole pieces with a lightly oiled cloth. Do not allow rust or 
corrosion to form on the magnetic core ends. 
 
LIMITED WARRANTY AND LIMITATION OF LIABILITY 
This Fluke product will be free from defects in material and workmanship for one year from the 
date of purchase. This warranty does not cover fuses, disposable batteries, or damage from 
accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or 
handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf. To obtain 
service during the warranty period, contact your nearest Fluke authorized service center to obtain 
return authorization information, then send the product to that Service Center with a description 
of the problem. 
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR 
A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY 
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING 
FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the exclusion or 
limitation of an implied warranty or of incidental or consequential damages, this limitation of 
liability may not apply to you. 
Fluke Corporation 
P.O. Box 9090 
Everett, WA 98206-9090 
U.S.A. 
Fluke Europe B.V. 
P.O. Box 1186 
5602 BD Eindhoven 
The Netherlands 
11/99