Tektronix A605 Manual de usuario

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Instructions

A605

500 Amp AC Current Probe

070–8880–00

First Printing: October 1993

%&-' )!)'%$ , $  "" ' )( '('+

!)'%$ , &'%*)( ' %+' -  $ %' $ &)$)( ((* $

&$ $ $%'#) %$ $ ) ( &*" ) %$ (*&'( )) $ "" &'+ %*("-

&*" ( #)' " &  ) %$( $ &'  $ &' + "( '('+

' $) $ ) 

!)'%$ , $  %,   "(%$+ ""  

 ' ' ()' )'#'!( % !)'%$ , $



!            

      "       " 

     "  !   

             

    !    

       "   " ! 

    !   "    

          

          

" !     !  "    

             " 

  !         

"     !  "    

  "  

 "   "  "      " #

         !  

       "     

  "    !    

            

            

           

      "    

         

         

        

        

      

         

        

         

      

         

   

1A605 Instructions

Product Description

The A605 is designed to extend the AC current range of a multimeter

up to 500 amps by acting as a proportional current/voltage

transformer. It is compatible with multimeters having an AC volts

function with an input resistance ≥1M.

General Safety Summary

Observe Maximum Working Voltage

Do not use the A605 above 440 VAC.

Do Not Operate in Wet/DampConditions

To avoid personal injury or damage to this product from electric

shock, do not operate this product in wet/damp conditions.

Do Not Operate in an Explosive Atmosphere

To avoid personal injury or fire hazard, do not operate this product in

an explosive atmosphere.

Do Not Immerse in Liquids

Clean the probe using a damp cloth. Refer to the cleaning instruc-

tions on page 6.

Do Not Use if Damaged

If you suspect that there is damage to this product, have it inspected

by qualified service personnel.

A605 Instructions 2

Operating Basics

WARNING. Do not clamp the probe onto circuits with voltages greater

than 440 VAC. Personal injury or damage to the probe may result.

Always connect the probe to the instrument before clamping

onto the circuit under test.

1. Connect the black lead to the meter COM, and the red lead to the

Vinput. Set the meter to the AC Volts position. See Figure 1 for

connection to a Tektronix DM 254.

Figure 1: Meter Connections

2. Connect the probe to the circuit by opening the jaws and

clamping around the conductor. Grabbing both the “hot’” and

neutral wires may give you a zero reading. See Figure 2.

Operating Basics

3A605 Instructions

Jaws

Handles

Figure 2: Connecting the A605

3. Adjust the meter as necessary to get a useable reading.

Each millivolt displayed on the meter indicates an ampere of current

in the circuit. For example: an 80 mV reading = 80 Amps in the

circuit.

(Remember to unclamp the probe from the conductor before

disconnecting it from your meter or instrument.)

To increase the measurement sensitivity of the A605, loop additional

turns of the wire under test through the jaws. See Figure 3. The

sensitivity of the A605 will be multiplied by the number of loops in

the jaws. For example: 1 mV/A X 4 turns = 4 mV/A.

Figure 3: Increasing the A605 Sensitivity

A605 Instructions 4

Functional Check

Follow the function check procedure to determine if your probe is

working properly.

AC Current

~60 Hz

Lamp

A605

Figure 4: Basic AC Test Circuit

To check your current probe, you will need a known AC voltage and

resistance. For example, measured 60 Hz line voltage and an

incandescent lamp of known approximate wattage are adequate. See

Figure 4. The power consumption of the lamp is usually printed on

the lamp. The lamp used should be designed for the test voltage.

1. Connect the probe to the instrument.

2. Connect the lamp to the line voltage.

3. Measure the line voltage at the lamp.

Functional Check

5A605 Instructions

4. Clamp the probe around one of the wires and measure the

current. (Additional loops may be necessary to get a reasonable

reading. See the Operating Basics section.)

5. Use the provided formulas to calculate current and error.

Currentcalculated Powerknown

Voltagemeasured

%Error 1Currentmeasured

Currentcalculated100

For example: given measured line voltage of 115 VAC, a 60 watt

light bulb, and 510 mA of measured current, find the calculated

current.

1510 mAmeasured

522 mAcalculated100 2.3% Error

60 watts

115 VAC 522 mAcalculated

An error of ±10% is acceptable, and a good indication that the probe

and meter are functioning properly.

The linearity of the probe can be checked by the method used to

increase measurement sensitivity. By increasing the number of loops

in the jaws, the measured current should increase proportionately.

A605 Instructions 6

Maintenance

Cleaning

To clean the probe body, use a soft cloth dampened in a solution of

mild detergent and water. To clean the core, open the jaw and clean

the exposed core surfaces with a cotton swap dampened with

isopropyl alcohol (isopropanol) or ethyl alcohol (fotocol or ethanol).

Lubricate the jaws mating surfaces with a light oil.

Do not use chemicals containing benzine, benzene, toluene, xylene,

acetone, or similar solvents.

Do not immerse the probe in liquids or use abrasive cleaners.

Preparation for Shipment

If the original packaging is unfit for use or not available, use the

following packaging guidelines:

1. Use a corrugated cardboard shipping carton having inside

dimensions at least one inch greater than the probe dimensions.

The box should have a carton test strength of at least 200 pounds.

2. Put the probe into a plastic bag or wrap to protect it from

dampness.

3. Place the probe into the box and stabilize it with light packing

material.

4. Seal the carton with shipping tape.

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