Fluke 77 Manuale per l'uso e la cura

September 2006

Model 77 Series IV

Digital Multimeter

Calibration Information

Introduction

XWWarning

To avoid electric shock or injury, do not perform the performance tests or

calibration adjustment procedures unless qualified to do so.

The information provided in this document is for the use of qualified personnel

only.

The Model 77 Series IV Calibration Information provides the information necessary to adjust and verify

the performance of the Fluke Model 77 Series IV Digital Multimeter (hereafter known as the Meter).

The following information is included in this document:

•Safety Information (page 2)

•International Electrical Symbols (page 3)

•Test Lead Alert (page 3)

•Specifications (page 4)

•Testing and Replacing the Fuses (page 7)

•Replacing the Battery (page 8)

•Cleaning (page 9)

•Replacing the LCD (page 9)

•Performance Tests (page 10)

•Calibration Adjustment (page 14)

•Replaceable Parts and Accessories (page 17)

•Complete Warranty (page 19)

See the Model 77 Series IV Users Manual for complete operating instructions.

Service Information

To contact Fluke, call one of the following telephone numbers:

USA: 1-888-99-FLUKE (1-888-993-5853)

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

Or, visit Fluke's Web site at www.fluke.com.

To register your product, visit register.fluke.com

Model 77 Series IV

Calibration Information

Safety Information

Warning and Caution Statements

A XW Warning identifies hazardous conditions and actions that could cause bodily harm or death.

A WCaution identifies conditions and actions that could damage the Meter, the equipment under test, or

cause permanent loss of data.

XWWarnings and Precautions

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter

or to the equipment under test, adhere to the following practices:

•Use the Meter only as specified in this manual or the protection provided by the Meter might

be impaired.

•Do not use the Meter or test leads if they appear damaged, or if the Meter is not operating

properly. If in doubt, have the Meter serviced.

•Always use the proper terminals, switch position, and range for measurement.

•Verify the Meter's operation by measuring a known voltage.

•Do not apply more than the rated voltage, as marked on the Meter, between the terminals or

between any terminal and earth ground.

•Use caution with voltages above 30 V ac rms, 42 V ac peak, or 60 V dc. These voltages pose

a shock hazard.

•Disconnect circuit power and discharge all high-voltage capacitors before testing

resistance, continuity, diodes, or capacitance.

•Do not use the Meter around explosive gas or vapor.

•When using the test leads, keep your fingers behind the finger guards.

•Remove test leads from the Meter before opening the Meter case or battery door.

Digital Multimeter

International Electrical Symbols

The following international symbols appear in this document, and on the Meter.

Symbols Description Symbols Description

BAC (Alternating Current) IFuse

FDC (Direct Current) PConforms to European Union directives

BDC/AC $Conforms to relevant Canadian Standards

Association directives

JEarth ground TDouble-insulated

WImportant Information; see manual. XHazardous Voltage

bBattery. (Low battery when shown on

display) ! Underwriters Laboratories, Inc.

Meter in accordance with IEC 61010-1. 54CJ

sInspected and licensed by TÜV

(Technischer Überwachungs Verein)

Product Services.

;

N10140 Conforms to relevant Australian standards

#Verband Deutscher Electroniker. German electronics association.

Test Lead Alert

XWWarning

Attempting to make a measurement with a test lead in an incorrect terminal

might blow a fuse, damage the Meter, and cause serious personal injury.

As a reminder to check that the test leads are in the correct terminals, LEAd is momentarily displayed when

the Rotary Switch is moved to or from the mA or Aposition.

Model 77 Series IV

Calibration Information

Specifications

Accuracy is specified for 1 yr after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at 0 % to 90 %. Accuracy

specifications take the form of ±([ % of Reading ] + [ Counts ]).

Maximum voltage between any

terminal and earth ground ................................... 1000 V

Surge protection ................................................... 8 kV peak per IEC 61010

WFuse for mA inputs.......................................... 440 mA, 1000 V FAST Fuse

WFuse for A inputs ............................................. 11 A, 1000 V FAST Fuse

Display

Digital.............................................................. 6000 counts, updates 4/sec

Bar Graph ....................................................... 33 segments; Updates 32/sec

Frequency....................................................... 10,000 counts

Capacitance.................................................... 1,000 counts

Altitude

Operating............................................................ 2,000 meters

Storage ............................................................... 12,000 meters

Temperature

Operating........................................................ -10 °C to +50 °C

Storage ........................................................... -40 °C to +60 °C

Temperature coefficient ....................................... 0.1 X (specified accuracy / °C (<18 °C or >28 °C)

Electromagnetic Compatibility

(EN 61326-1:1997) ................................................. In an RF field of 3 V/M, accuracy = specified accuracy except in temperature: specified

accuracy ±5 °C (9 °F)

Relative Humidity (Maximum Non-condensing). 90 % to 35 °C

75 % to 40 °C;

45 % to 50 °C

Battery Life ............................................................ 400 hrs typical (Alkaline)

Size (H x W x L) ..................................................... 4.3 cm x 9 cm x 18.5 cm

Weight.................................................................... 420 g

Safety Compliance................................................ ANSI/ISA S82.02.01, CSA C22.2-1010.1, IEC 61010 to 1000 V Measurement Category

III, 600 V Measurement Category IV

Certifications......................................................... CSA, TÜV (EN61010), UL, P, ;(N10140),VDE

Digital Multimeter

Specifications

Function Range Resolution Accuracy ± ( [ % of Reading ] + [ Counts ] )

AC Volts (Average

responding)

6.000 V

60.00 V

600.0 V

1000 V

0.001 V

0.01 V

0.1 V

1 V

2.0 % + 2

(45 Hz to 1 kHz)

DC mV 600.0 mV 0.1 mV 0.3 % + 1

DC Volts 6.000 V

60.00 V

600.0 V

1000 V

0.001 V

0.01 V

0.1 V

1 V

0.3 % + 1

Continuity 600 Ω1 ΩMeter beeps at <25 Ω, beeper turns off at >250 Ω;

detects opens or shorts of 250 μs or longer.

Ohms

600.0 Ω

6.000 kΩ

60.00 kΩ

600.0 kΩ

6.000 MΩ

50.00 MΩ

0.1 Ω

0.001 kΩ

0.01 kΩ

0.1 kΩ

0.001 MΩ

0.01 MΩ

0.5 % + 2

0.5 % + 1

2.0 % + 1

Diode test 2.400 V 0.001 V 1 % + 2

Capacitance

1000 nF

10.00 μF

100.0 μF

9999 μF[1]

1 nF

0.01 μF

0.1 μF

1 μF

1.2 % + 2

10 % typical

AC Amps (Average

responding)[2]

60.00 mA

400.0 mA[3]

6.000 A

10.00 A[4]

0.01 mA

0.1 mA

0.001 A

0.01 A

2.5 % + 2

(45 Hz to 1 kHz)

Notes:

[1] In the 9999 μF range for measurements to 1000 μF, the measurement accuracy is 1.2 % + 2.

[2] Amps input burden voltage (typical): 400 mA input 2 mV/mA, 10 A input 37 mV/A.

[3] 400.0 mA accuracy specified up to 600 mA overload.

[4] >10 A unspecified.

Function Range Resolution Accuracy ± ( [ % of Reading ] + [ Counts ] )

DC Amps[3]

60.00 mA

400.0 mA[4]

6.000 A

10.00 A[5]

0.01 mA

0.1 mA

0.001 A

0.01 A

1.5 % + 2

Hz[1], [2]

(ac voltage input ) 99.99 Hz

999.9 Hz

9.999 kHz

99.99 kHz

0.01 Hz

0.1 Hz

0.001 kHz

0.01 kHz

0.1 % + 1

MIN MAX AVG For dc functions, accuracy is the specified accuracy of the measurement function ±12 counts for changes longer than

350 ms in duration.

For ac functions, accuracy is the specified accuracy of the measurement function ±40 counts for changes longer than

350 ms in duration.

Notes:

[1] Frequency is specified from 2 Hz to 99.99 kHz.

[2] Below 2 Hz, the display shows zero Hz.

[3] Amps input burden voltage (typical): 400 mA input 2 mV/mA, 10 A input 37 mV/A.

[4] 400.0 mA accuracy specified up to 600 mA overload.

[5] >10 A unspecified.

Model 77 Series IV

Calibration Information

Function Overload

Protection[1] Input Impedance

(Nominal) Common Mode Rejection Ratio

(1 kΩUnbalanced) Normal Mode Rejection

Volts AC 1000 V >10 MΩ<100 pF >60 dB @ dc, 50 Hz or 60 Hz

Volts DC 1000 V >10 MΩ<100 pF >120 dB @ dc, 50 Hz or 60 Hz >60 dB @ 50 Hz or 60 Hz

mV 1000 V2>10 MΩ<100 pF >120 dB @ dc, 50 Hz or 60 Hz >60 dB @ 50 Hz or 60 Hz

Full Scale Voltage To:

Open Circuit Test

Voltage 6.0 MΩ50 MΩShort Circuit Current

Ohms/Capacitance 1000 V2< 8.0 V dc <660 mV dc <4.6 V dc <1.1 mA

Continuity/Diode test 1000 V2<8.0 V dc 2.4 V dc <1.1 mA

[1] 10 7 V-Hz maximum.

[2] For circuits <0.3 A short circuit. 660 V for high energy circuits.

Function Overload Protection Overload

mA Fused, 440 mA, 1000 V FAST Fuse 600 mA overload for 2 minutes maximum, 10

minutes rest.

A Fused, 11 A, 1000 V FAST Fuse 20 A overload for 30 seconds maximum, 10

minutes rest.

Digital Multimeter

Testing the Fuses

XWWarning

To avoid electrical shock or personal injury:

•Remove the test leads and any input signals before replacing the battery or

fuses.

•To avoid electrical shock, arc blast, or damage to the Meter, install only

fuses with the amperage, interrupt, voltage, and speed ratings specified in

Table 4.

To test the fuses (refer to Figure 1):

1. Set the Rotary Switch to e.

2. Plug a test lead into the VeG terminal and touch the probe to the 400 mA to test the 440 mA Fuse or

10 A terminal to test the 11 A Fuse.

•If the display shows a resistance value in the range shown in Figure 1, the fuse is good.

•If the display reads OL, replace the fuse and test again.

•If the display shows any other value, have the Meter serviced. See “Service Information” earlier in

this manual.

11 A440 mA

<0.5

<12 OKOK

RANGEHOLD

MINMAX

aik12f.eps

Figure 1. Testing the Current Fuses

Model 77 Series IV

Calibration Information

Replacing the Fuses

XWWarning

To avoid electrical shock, arc blast, or damage to the Meter, install only fuses

with the amperage, interrupt, voltage, and speed ratings specified in

Table 4.

To replace the Fuses (refer to Figure 2):

1. Turn the Rotary Switch to OFF.

2. Disconnect the test leads and/or any connectors from the terminals.

3. Remove the four screws from the Case Bottom and separate the Case Top from the Case Bottom.

4. Remove the fuses F1 and F2 by gently prying one end loose, then slide the fuse out of its bracket, and

replace with exact replacement only.

5. Rejoin the Case Bottom, Case Top, Battery compartment door, and reinstall the four screws.

Replacing the Battery

To replace the Battery (refer to Figure 2):

1. Turn the Rotary Switch to OFF and remove the test leads from the terminals.

2. Remove the two screws from the Battery Compartment Door, and remove it from the Case Bottom.

3. Remove the Battery (B1) from the battery connector.

4. Replace the Battery with a new 9 V battery (NEDA A1604, 6F22, or 006P).

5. Reattach the Battery Compartment Door to the Case Bottom, and reinstall the two screws.

aik13f.eps

Figure 2. Battery and Fuse Replacement

Digital Multimeter

Cleaning

XWWarning

To avoid electrical shock:

•Remove test leads and any input signals before cleaning.

•Do not reinstall the pca until it is completely dry.

•Dirt or moisture in the terminals can affect readings.

WCaution

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

instruments.

Do not use detergents of any kind for cleaning the pca.

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

The pca may be washed with isopropyl alcohol or hot deionized water and a soft brush. Remove excess

cleaning material with clean dry air at low pressure, then dry the pca at 50 °C.

Replacing the LCD

WCaution

To prevent contamination, do not handle the conductive edges of the LCD or

the LCD Elastomeric Connectors.

If the edges are contaminated, clean them with alcohol. Allow the alcohol to dry

before reassembling.

To remove and replace the LCD, perform the following procedure (refer to Figure 3):

1. Turn the rotary switch to OFF and remove the test leads from the Meter terminals.

2. Remove the four screws from the case bottom, and separate the case top from the case bottom

The circuit board remains attached to the case bottom.

3. Remove the battery compartment and disconnect the battery from the battery connector.

4. Remove the pca screw located under the 440 mA fuse, and lift the pca out of the case bottom. The

beeper is loose in the case. Exercise caution not to damage it.

5. Loosen the four screws in the area of the LCD on the back of the pca. This will facilitate reinstalling

the LCD.

6. Insert a small, flat-head screwdriver under the LCD mask edge and gently pry the LCD mask from the

snaps.

WCaution

Take care to not break the LCD with the screwdriver.

7. Lift out the LCD.

8. Make sure that all connector contact points are clean. Refer to “Cleaning” for more information.

9. Install a new LCD, taking care that it is correctly oriented.

10. Reattach the LCD Mask to the LCD assembly by snapping the LCD mask into place.

11. Tighten the 4 screws on the back of the pca.

12. Lay the pca back into the case bottom, and screw it down.

13. Reinsert the 440 mA Fuse.

14. Reinstall the battery.

15. Rejoin the case bottom, case top, battery compartment door, and reinstall the four case screws.

Model 77 Series IV

Calibration Information

LCD Mask

aik15f.eps

Figure 3. Removing the LCD Mask

Performance Tests

The following performance tests verify the complete operation of the Meter and check the accuracy of

each Meter function against its specifications. The recommended calibration interval is 12 months. If the

Meter fails any part of the test, calibration adjustment and/or repair is indicated.

In the performance tests, the Meter is referred to as the unit under test (UUT).

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