Fluke 771-KIT2 User manual

®

771

Milliamp Process Clamp Meter

Calibration Manual

November 2007

© 2007 Fluke Corporation, All rights reserved. Printed in USA. Product specifications are subject to change without notice.
All product names are trademarks of their respective companies.

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Table of Contents

Title Page

Introduction........................................................................................................ 1

Contacting Fluke................................................................................................ 2

Safety Information ............................................................................................. 2

Symbols ............................................................................................................. 3

Specifications..................................................................................................... 4

Getting Acquainted with the Meter.................................................................... 5

Maintenance....................................................................................................... 6

Cleaning the Meter ........................................................................................ 6

Battery Replacement ..................................................................................... 6

Performance Tests.............................................................................................. 8

Required Equipment...................................................................................... 8

Testing the Batteries ...................................................................................... 8

Testing the Display........................................................................................ 9

Display Hold Test.......................................................................................... 9

Backlight Test................................................................................................ 9

Spotlight LED Test........................................................................................ 9

Zero Test........................................................................................................ 9

Accuracy Tests .............................................................................................. 9

Calibration Adjustment...................................................................................... 11

Adjustment Subroutines ................................................................................ 11

Front Panel Operation for Adjustment .......................................................... 11

Calibration Error Messages ........................................................................... 12

Calibration Adjustment Procedure ................................................................ 12

Temperature Adjustment Procedure.............................................................. 13

Low Range Adjustment Procedure................................................................ 13

High Range Adjustment Procedure ............................................................... 13

Phase Adjustment Procedure......................................................................... 14

User Replaceable Parts ...................................................................................... 15

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List of Tables

Table Title Page

1. Symbols.................................................................................................................. 3

2. Required Equipment............................................................................................... 8

3. Accuracy Tests ....................................................................................................... 10

4. Error Messages....................................................................................................... 12

5. Replaceable Parts ................................................................................................... 15

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List of Figures

Figure Title Page

1. The 771 Milliamp Process Clamp Meter ............................................................... 5

2. Changing the Batteries ........................................................................................... 7

3. Display Test ........................................................................................................... 9

4. Accessing the Calibration Button........................................................................... 12

5. Phase Adjustment................................................................................................... 14

6. Replaceable Parts ................................................................................................... 16

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Introduction

To avoid electric shock or personal injury, do not perform the
calibration verification tests or calibration procedures
described in this manual unless you are qualified to do so.
The information provided in this manual is for the use of
qualified personnel only.

This manual provides the complete verification and adjustment procedure for the
771 Milliamp Process Clamp Meter (referred to in this manual as the Meter).
The Meter allows closed-case calibration using reference sources. It measures the
reference signals, calculates the correction factors, and stores them in memory. The
instrument should be calibrated after repair, or if it fails a performance test.

The 771 Calibration Manual provides the following information:

• Precautions and safety information

771

Milliamp Process Clamp Meter

XW Warning

• Specifications

• Basic maintenance

• Calibration verification procedure

• Replaceable parts and accessories

For complete operating instructions, refer to the 771 Instruction Sheet.

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771

Calibration Manual

Safety Information

In this manual, a Warning identifies conditions and actions that pose hazard(s) to the
user. A Caution identifies conditions and actions that may damage the test instrument.

The design and manufacture of the device conforms to the latest state of technology and
the safety standards specified in IEC 61010-1/ 2

nd edition. If used improperly, there is a

risk of damage to persons and property.

XWWarning

To avoid possible electric shock or personal injury, follow these
guidelines:

• Read this manual before use and follow all safety

instructions.

• Use the Meter only as specified in this manual; otherwise,

the Meter's safety features may be impaired.

• Before each use inspect Meter and cable for damage. Look

for cracks and missing portions of the clamp and cable. Do
not use if clamp is damaged.

• Use caution when working with voltages above 33 V rms

47 V peak or 70 V dc these voltages pose a shock hazard.

• Do not use to measure ac current.

• Do not use to measure dc mA in circuits carrying more

than 300 V CAT II.

• Avoid working alone so assistance can be rendered in an

emergency.

• Use extreme caution when working around bare

conductors or bus bars. Contact with the conductor could
result in electric shock.

• To avoid false readings that can lead to electrical shock

and injury, replace the batteries as soon as the low battery
indicator (B) appears.

• 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.

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Symbols

• When measuring, keep fingers behind the Tactile Barrier.

See Figure 1.

• Not for use with non-insulated conductors.

WCaution

To avoid damage to the Meter, do not open the Meter for
cleaning. Do not use solvents to clean it, and do not immerse it
in liquid.

Symbols

Table 1 explains the symbols that are used on the Meter or in this manual.

Table 1. Symbols

-

W

X

T

M

B

P
F

~

;

N10140

)

CAT II

300 V

Do not apply around, or remove from HAZARDOUS LIVE conductors

Risk of danger. Important information. See Users Manual.

Risk of Electrical Shock

Equipment protected by double or reinforced insulation

Battery

Low Battery

Conforms to relevant European Union directives

DC (Direct Current)

Do not dispose of this product as unsorted municipal waste. Go to Fluke’s web site for
recycling information.

Conforms to relevant Australian standards

Conforms to relevant Canadian and US standards

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.

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771

Calibration Manual

Specifications

Current Ranges ±20.99 mA ±21.0 mA - ±99.9 mA

Resolution 0.01 mA 0.1 mA

Accuracy

20.99 mA range

99.9 mA range

Maximum Reading ±99.9 mA

Influence of Earth’s Field < 0.20 mA

Battery 2 AA 1.5 V Alkaline, IEC LR6

Working hours 45 hours

Size (H X W X L) 59 mm x 38 mm x 212 mm (2.32 in x 1.49 in x 8.34 in)

Weight 260 g (9.17 oz) (Including battery)
Operating Temperature -10 to 50 °C

Storage Temperature -25 to 70 °C

Operating Humidity < 90 % @ <30 °C (86 °F)

Operating Altitude 0 to 2000 m (1.24 miles)

Storage Altitude None

IP Rating IP 40

0.2 % reading ±5 digits
1 % reading ±5 digits

(with clamp nested)

(14 to 122 °F)

(-13 to 158 °F)

<75 % @ 30 to 50 °C (86 to 122 °F)

4

Vibration Requirements Random 2 g, 5 to 500 Hz

EMI, RFI, EMC Meets all applicable requirements in EN 61326-1

Temperature Coefficients 0.1x(specified accuracy)/°C

(< 18 °C or > 28 °C)

Measurement Category IEC 61010-1

61010-2-032
CAT II 300 V

CAT II Equipment is designed to protect against transients from
energy-consuming equipment supplied from the fixed installation,
such as TVs, PCs, portable tools, and other household appliances.

Agency Approvals

P, ), ;, FCC

N10140

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Milliamp Process Clamp Meter

Getting Acquainted with the Meter

Getting Acquainted with the Meter

Figure 1 shows the Meter functions and features.

9

6

5

4

3

2

1

7

8

Number Description

A

B

C

D

E

F

G

H

I

Turns the Meter on and off. When the Meter is in sleep mode, press this button to wake it up.

Captures and holds the current reading

Removes interference and zeros the display

Measurement spotlight LED button

Measurement spotlight LED

Detachable clamp

Turns the backlight off and on

LCD

Tactile Barrier docked and un-docked

Figure 1. The 771 Milliamp Process Clamp Meter

ege01a.eps

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771

Calibration Manual

Maintenance

Cleaning the Meter

XWWarning

To avoid possible electric shock or personal injury, repairs or
servicing not covered in this manual should be performed only
by qualified personnel.

XWWarning

To avoid electrical shock, remove any input signals before
cleaning.

W Caution

To avoid damaging the Meter, do not use aromatic
hydrocarbons or chlorinated solvents for cleaning. These
solutions will react with the plastics used in the Meter.

Clean the instrument case with a damp cloth and mild detergent.

Battery Replacement

To avoid false readings, that could lead to possible electric
shock or personal injury, replace the battery as soon as the low
battery indicator (B) appears.

To replace the batteries, see Figure 2:

1. Turn the Meter off.

2. Use a flat head screwdriver to loosen the battery access door fastener, and remove the

door from the case bottom.

3. Remove the batteries.

4. Replace the batteries with two new AA batteries.

5. Reattach the battery access door to the case bottom and tighten the fastener.

XWWarning

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Maintenance

Figure 2. Changing the Batteries

ege02.eps

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771

Calibration Manual

Performance Tests

Required Equipment

XWWarning

To avoid electrical shock, personal injury, or fire:

• Do not perform the verification tests or calibration

adjustment described in this manual unless you are
qualified to do so.

• Repairs or servicing should be performed only by qualified

personnel.

The following tests are used to verify the functions of the Meter. If the Meter fails any of
the verification tests, repair is necessary. For service, see Contacting Fluke.

Required equipment for the performance tests is listed in Table 2. If the recommended
models are not available, equipment with equivalent specifications may be used.

Table 2. Required Equipment

Equipment

Calibrator

1 loop insulated copper wire

Testing the Batteries

Prior to performing the following tests, check the batteries with a multimeter and replace
as necessary. See Battery Replacement.

Minimum Required

Characteristics

DC Current Accuracy:

Range:

20.99 mA = 0.11 %

99.9 mA = 0.375 %

Insulated 18 gauge, minimum, copper
wire, 6 inch diameter

Recommended Model

5520A or equivalent

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Milliamp Process Clamp Meter

Performance Tests

Testing the Display

1. Press and hold Awhile powering on the Meter.

2. Compare the Meter display to Figure 3.

3. Check all display segments for clarity and contrast.

Display Hold Test

1. Power on the Meter and allow time for the normal operating display to appear.

2. Press H and observe that I appears on the display. I flashes at 3 to 4

second intervals.

Backlight Test

1. Power on the Meter and allow time for the normal operating display to come up.

2. Press C and observe that the backlight comes on.

Spotlight LED Test

1. Power on the Meter and allow time for the normal operating display to come up.

2. Press L and observe that the spotlight LED comes on.

Zero Test

1. Power on the Meter and allow time for the normal operating display to come up.

2. Press A. The main display momentarily reads 0.00, and the percentage scale

momentarily reads -25.0%.

Figure 3. Display Test

fdp1.eps

Accuracy Tests

Accuracy specifications are valid for 1 year after calibration when measured at an
operation temperature of 18 °C to 28 °C. Allow the Meter to stabilize at room
temperature prior to performing the accuracy tests.

Table 3 lists the required performance test points for verifying Meter accuracy. A zero
adjustment must be performed prior to completing each performance test point.

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771

Calibration Manual

Perform the tests as follows:

1. Connect a single loop of 14 gauge insulated copper wire to the calibrator AUX output

terminals.

2. Clamp the Meter jaw around the wire with the jaw arrow pointing toward the

calibrator HI terminal.

3. Output 0 mA dc from the calibrator.

4. Press A on the Meter.

5. Set the calibrator output for the value in Step 1 of Table 3.

6. Compare the Meter displayed reading with the display reading limits in Table 3.

7. Complete steps 2-4 for each calibrator output setting in Table 3.

8. If the Meter fails to meet any of the Display Reading Limits, it requires calibration

adjustment, or repair. See Calibration Adjustment or Contacting Fluke.

Table 3. Accuracy Tests

Step

1. 100 mA dc 98.5 101.5

2. -100 mA dc -100.7 -99.3

3. 20 mA dc 19.91 20.09

4. -20 mA dc -20.09 -19.91

5. 12 mA dc 11.93 12.07

6. -12 mA dc -12.07 -11.93

7. 4 mA dc 3.94 4.06

8.

Unit Under Test

Function

mA dc

Calibrator

Output Setting

Lower Limit Upper Limit

-4 mA dc -4.06 -3.94

Unit Under Test

Display Reading Limits

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Milliamp Process Clamp Meter

Calibration Adjustment

Calibration Adjustment

Adjustment Subroutines

The Meter features closed-case calibration adjustment using a known reference source.
The Meter measures the applied reference source, calculates correction factors, and stores
the correction factors in nonvolatile memory.

There are four adjustment subroutines in the Meter adjustment procedure:

• Low Range (±20 mA)

• High range (±100 mA)

• Temperature

• Phase

Note

Temperature adjustment should always be performed prior to performing
the other adjustment routines. The phase adjustment routine is ONLY
required if the unit is repaired or the current clamp is replaced.

Front Panel Operation for Adjustment

Use a small probe to press the calibration button once to enter the Meter’s calibration
mode. The calibration button is usually covered by the factory calibration seal. A second
press of the button saves new calibration constants and exits calibration mode.
See Figure 4.

In calibration mode, C is used to select subroutines: low range, high range, temperature,
or phase. A short press of C (<1 second) will toggle between low and high range
subroutines. A long press (>1 second) will toggle between temperature and phase
subroutines.

• Pressing A is valid for all subroutines and normal operation. Pressing A will

zero the reading.

• In the low and high range subroutines, H and L are used to adjust the negative

and positive gain of the range.

• In the temperature subroutine, only H is valid for adjustment.

• In the phase subroutine, H and L are used to adjust the phase of two

sensor-excitation signals by increasing or decreasing a parameter.

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771

Calibration Manual

Calibration Button

Figure 4. Accessing the Calibration Button

fdp3.eps

Calibration Error Messages

Table 4 lists the calibration error messages that can be shown on the Meter display.
The suggested actions to eliminate messages are also listed.

Table 4. Error Messages

Error

Message

The difference between the input level

CAL ERR1

CAL ERR2

CAL ERR3 Code checksum failure. The Meter requires repair.

and the zero point is less than the
minimal threshold when performing low
range and high range adjustments.

Calibration parameter checksum
failure.

Cause of Error Suggested Action

Check current loop and ensure correct
current is generated.

Execute all adjustments including
temperature and phase.

Calibration Adjustment Procedure

Allow the Meter to stabilize to room temperature before beginning the calibration
adjustment.

To prepare for adjustment:

1. Remove the battery door and calibration seal.

2. Clamp the current loop in the current flow direction where required.

3. Turn the meter on and wait at least 10 seconds for warming up.

4. Press the hidden calibration button with a probe to enter calibration mode.

See Figure 4.

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Milliamp Process Clamp Meter

Temperature Adjustment Procedure

1. Press C for >1 second until t23 appears on the percentage display.

2. Wait at least 60 seconds for the internal temperature to balance.

3. Press H to adjust the temperature.

Low Range Adjustment Procedure

1. Clamp the Meter’s current clamp around an insulated 18 gauge, copper wire, with

6-inch diameter. Current flow should be in the direction of the arrow on the current
clamp.

2. Press C < 1 second until CAL 20 appears on percentage display.

3. Output 0 µA dc from the calibrator.

4. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

5. Press A on the Meter to zero the reading.

6. Output 20 mA dc from the calibrator.

7. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

Calibration Adjustment

8. Press L on the Meter to adjust the positive gain.

9. Output -20 mA dc from the calibrator.

10. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

11. Press H on the Meter to adjust the negative gain.

High Range Adjustment Procedure

1. Clamp the Meter’s current clamp around an insulated 18 gauge, copper wire, with

6-inch diameter. Current flow should be in the direction of the arrow on the current
clamp.

2. Press C < 1 second until CAL 100 appears on percentage display.

3. Output 0 µA dc from the calibrator.

4. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

5. Press A on the Meter to zero the reading.

6. Output 100 mA dc from the calibrator.

7. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

8. Press L on the Meter to adjust the positive gain.

9. Output -100

10. Wait at least 15 seconds for the Meter’s internal circuits to stabilize.

mA dc from the calibrator.

11. Press H on the Meter to adjust the negative gain.

Note

The following procedure is not required unless the Meter’s current clamp
has been replaced.

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771

Calibration Manual

Phase Adjustment Procedure

1. Clamp the Meter’s current clamp around an insulated 18 gauge, copper wire, with

6-inch diameter. Current flow should be in the direction of the arrow on the current
clamp.

2. Press C >1 second until the percentage display indicates the Meter’s currently saved

phase value.

3. Output 0 µA dc from the calibrator.

4. Press A on the Meter to zero the reading.

5. Rotate the Meter’s clamp around the current loop conductor and record the minimum

and maximum values of the Meter’s display reading. See Figure 5.

6. Use Land H, to adjust the difference between the minimum and maximum value

recorded in Step 5, until the reading difference is less than 0.05 mA.

5520A

CALIBRATOR

Rotate Meter clamp around
current loop conductor

NORMAL AUX

V, , ,

RTD

A, -SENSE,

HI

LO

GUARD

20V PK MAX

SCOPE

AUX V

OUT

TRIG

20A

20V PK MAX

TC

OPRSTBY EARTH

7 8 9

456

123

+

/

0

•

fdp5.eps

Figure 5. Phase Adjustment

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Milliamp Process Clamp Meter

User Replaceable Parts

User Replaceable Parts

Table 5 and Figure 6 list all user replaceable parts.

Table 5. Replaceable Parts

Item ID Description P/N Qty

A Decal 2723063 1

B

C Keypad 2723056 1

D Jaw assembly (Includes cable) 2722971 1

E

F

G Cable cleat 2720328 1

H Screw,4-14,.375,pan,phillips,steel, zinc-black chromate, thread form 2800097 2

I Battery contact, dual 666435 1

J

K

L

M

Case top assembly
(does not include decal, order separately)

Screw,m2.2x0.8,8mm,pan,phillips,steel,zinc-black chromate, thread
form

Case, bottom
(does not include battery contact, order separately)

Screw,m3,13.5mm,pan,phillips,steel,zinc-black chromate, thread
form

Battery,primary,mno2­zn,1.5v,2.24ah,15a,lr6,alkaline,aa,14x50mm,bulk

Battery pad,urethane,adhesive-back,20.0mm l,20.0mm w,5.0mm
thk

Battery door
(does not include fastener, order separately)

2720362 1

1991287 2

2720285 1

2388412 2

376756 2

2687457 1

2720304 1

N Access door fastener 948609 1

O LED housing 2720319 1

- Soft case, black/yellow 2726174 1

- 771 Instruction Sheet 2567301 1

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771

Calibration Manual

1

2

3

4

5

6

15

7

8

11

13

14

10

9

12

fdp4.eps

Figure 6. Replaceable Parts

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