Fluke 705 Manuale utente

PN 667345 December 1998, Rev.1, 12/99

All product names are trademarks of their respective companies. 1

Model 705

Loop Calibrator

Calibration Information

W Warning

To avoid electrical shock, remove test leads and any input signals from the

Model 705 Loop Calibrator before opening the case.

Caution

The Model 705 Loop Calibrator contains parts that can be damaged by static

discharge. Follow the standard practices for handling static sensitive

devices.

Introduction

The Calibration Information for the Model 705 Loop

Calibrator (hereafter referred to as the Loop

Calibrator) provides the information necessary to

calibrate and verify the performance of the Loop

Calibrator.

This document includes the following:

•Contacting Fluke for service

•Specifications

•Cleaning

•Replacing the battery

•Disassembly and reassembly

•Recommended test equipment

•Performance verification procedures

•Calibration adjustments

•User-replaceable parts

Complete operating instructions and the warranty

statement for the Model 705 Loop Calibrator are

provided in the Instruction Sheet that came with it.

Contacting Fluke for Service

This Fluke product will be free from defects in

material and workmanship for three years from the

date of purchase.

The complete warranty statement is in the Model 705

Loop Calibrator Instruction Sheet.

To locate an authorized service center, visit us on the

World Wide Web: www.fluke.com or call Fluke using

the phone numbers listed below:

•1-888-99FLUKE (1-800-993-5853) in USA

•1-800-36-FLUKE (1-800-363-5853) in Canada

•+31 402-678-200 in Europe

•+81-3-3434-0181 in Japan

•+65-738-5655 in Singapore

•+1-425-356-5500 from other countries

Fluke 705

Calibration Information

Specifications

Product specifications are provided Tables 1 and 2. These specifications are based on a 1-year calibration cycle and

apply from 18 ºC to 28 ºC (64 ºF to 82 ºF) unless stated otherwise. Accuracy specifications are given as follows:

± ( [ % of reading ] + [ number of least significant digits ] ).

Table 1. General Specifications

Maximum voltage between any

terminal and earth ground or

between any two terminals

30 V

Display: 0 to 28 V with 0.001 V resolution, 0 to 24 mA with 0.001 mA resolution

Operating Temperature: -10 °C to 55 °C

Storage Temperature: -40 °C to 60 °C

Temperature Coefficient: ±0.005 % of range per °C for -0 °C to 18 °C and 28 °C to 55 °C

Relative Humidity: 95 % to 30 °C,

75 % to 40 °C,

45 % up to 50 °C,

35 % up to 55 °C

Operationing Altitude: 3000 meters maximum

Power Requirements: Single 9 V battery (ANSI/NEDA 1604A or IEC 6LR61)

Battery Life (Typical): Source Mode: 18 hours; 12 mA into 500 Ω

Measure / Simulate Mode: 50 hours

Shock, Vibration: 1 meter drop test

Random vibration 2 g @ 5 to 500 Hz

Size (H x W x L): 32 mm x 87 mm x 187 mm (1.25 in x 3.41 in x 7.35 in)

Weight: 349 g (12.3 oz). With Holster and flex-stand: 601 g (21.2 oz)

Safety Certified as compliant to CAN/CSA C22.2 No. 1010.1:1992.

Complies with ANSI/ISA S82.01-1994

Certification Pand )

Table 2. Accurcy Specifications

Function Range Resolution Accuracy

DC Volts Input + 28 V 0.001 V ± (0.025 % + 1)

DC mA Input 24 mA 0.001 mA ±( 0.02 % + 2)

DC mA Output 0 mA to 24 mA 0.001 mA ± (0.02 % + 2)

E0 % -100 % - 0 % 40 second smooth ramp

O0 % -100 % - 0 % 15 second smooth ramp

N0 % -100 % - 0 % Stair-step ramp in 25 % steps, pausing 5 seconds at each step

Source mode: Compliance: ≥1000 Ωat 20 mA

Simulate mode: External loop voltage requirements: 24 V nominal, 30 V maximum, 12 V minimum

Loop Power ≥24 V

Percent display - 25 % to 125 %

Input/Output protection Input/Output protection on mA range: resettable, nonreplaceable 0.1 A fuse.

Loop Calibrator

Cleaning

WWarning

To avoid electrical shock, remove test

leads and input signals before cleaning.

To clean the case, wipe it with a cloth lightly

dampened with water and a mild detergent.

Do not use abrasives, solvents, or alcohol.

Replacing the Battery

WWarning

To avoid false readings, which could lead

to possible electric shock or personal

injury, replace the battery as soon as the

low battery symbol ( M) appears on the

Loop Calibrator’s display.

To replace the battery:

1. Lift and remove the battery cover to gain access

the battery compartment. See Figure 1.

2. Lift the battery from the case bottom and insert a

new 9 V battery.

3. Be sure the positive and negative battery posts

are oriented correctly, as noted in the bottom of

the battery compartment.

AAK07F.EPS

Figure 1. Replacing the Battery

Disassembling and Reassembling the

Calibrator

WWarning

To avoid electric shock or personal injury:

•Do not allow water into the case.

•Remove any input signals prior to

removing test leads and opening case.

•When servicing the Loop Calibrator,

use only specified replacement parts.

To disassemble and reassemble the Loop Calibrator,

refer to Figures 2 and 3 as necessary and perform the

following procedure.

Note

Both a Phillips-head screwdriver and a flat-

blade screwdriver are required.

1. To remove the printed circuit assembly (pca):

Remove all test leads from the terminals of the

Loop Calibrator.

2. Set the rotary switch to OFF.

3. Lift and remove the battery cover to gain access

to the battery compartment. Remove the battery.

4. Remove all Phillips-head screws from the case

bottom.

5. Separate the case top from the case bottom.

Verify that the battery terminals are being guided

through the bottom case before completely

removing the case bottom.

6. Referring to Figure 3, insert a small, flat-blade

screwdriver between the edge of the case top and

the pca. Gently unsnap the case top from the pca.

7. Repeat step 6 for each of the remaining snaps that

secure the pca to the case top.

8. Lift the pca from the case top by its edges.

9. If the elastomeric strips for the keypad assembly

and LCD are stuck to the pca, remove them, but

do not touch the conductive edges.

Note

Before reinserting the pca, make sure that the

rotary knob is in the OFF position.

Fluke 705

Calibration Information

Case, Top

Lens

Keypad Assembly

Actuator Switch

Main PCA

Foot

LCD

Elastomeric Strip

(LCD to PCA)

Switch Support Assembly

Case, Bottom

Battery Door

Battery

Screw, THD Form, PH.P.STL,

5-14 x .750

AAK10F.EPS

Figure 2. Disassembled Loop Calibrator

Loop Calibrator

Disassembling and Reassembling the Calibrator

10. To remove the switch support: Use a small,

flat-blade screwdriver to gently unsnap the

sides and top of the switch support from the

snaps shown in Figure 2.

The LCD, keypad assembly, and elastomeric

strips are accessible and can be replaced as

needed.

Do not allow the LCD to get wet.

Before installing a new LCD, make sure that

all connector contact points are clean.

Caution

Do not touch the conductive edges of the

elastomeric strips or the contacts on the

keypad assembly. If they are ontaminated,

clean them with isopropyl alcohol.

11. To reinsert the pca: Place the pca over the four

screw posts in the case top.

Gently press on the center of the pca while using

the small flat-edge screwdriver to shoehorn the

pca under the snap on a side of the case top.

Repeat on the other side and the top.

12. To reassemble to Calibrator: Reassembling the

Calibrator is the reverse of disassembling it.

After the Calibrator is reassembled, perform the

verfication test to confirm that the Loop

Calibrator is working properly.

Snap

Snap Snaps

AAK02F.EPS

Figure 3. Removing and Reinserting the Printed Cirsuit Assembly (PCA)

Fluke 705

Calibration Information

Recommended Test Equipment

A list of recommended equipment for the

performance verification tests and calibration

adjustment procedure is shown in Table 3.

Performance Verification Procedures

WWarning

To avoid electric shock, do not perform

the verification tests unless the Loop

Calibrator is fully assembled.

Perform the following tests to check the accuracy of

each of the Loop Calibrator’s functions against its

specifications.

If the Loop Calibrator fails any of these tests,

calibration adjustment or repair is required.

DC Current Source Mode

1. Rotate the Loop Calibrator’s function switch

from OFF to the mA / SOURCE / SIMULATE /

MEASURE position.

The Loop Calibrator should display 4.000 mA. If

it is displaying 0.000 mA, turn the Loop

Calibrator off, press hold U. Turn on the Loop

Calibrator to the mA position. Continue to hold

Uuntil 4.000 mA is displayed (about three

seconds).

2. Connect the Loop Calibrator’s [+] terminal to the

HP 3458A I input, and the COM terminal to the

HP 3458 LO input.

Verify that the display shows SOURCE in the

upper-left corner.

3. Set the HP 3458A to measure DC Amps (DCI).

Refer to Table 4 to verify the readings on the HP

3458A for the following tests. (No adjustment is

necessary for test 1.)

4. Test 2: Press the Pkey twice to select 12.000

mA. Verify the readings.

5. Test 3: Press the Pkey twice to select 20.000

mA/ Press and hold the Ukey until 24.000 mA

is displayed. Verify the readings.

DC Current Measurement Mode

1. Press the Mkey twice to get into the

measurement mode.

The Loop Calibrator’s display should read

MEASURE.

2. Disconnect the HP 3458A from the Loop

Calibrator.

3. Connect the test leads from the AUX terminals of

the Fluke 5500A to the terminals on the Loop

Calibrator (Black to COM and red to [+]).

4. Set the Fluke 5500A to test 4 in Table 4 and

verify the display readings on the Loop

Calibrator.

Repeat for tests 5 and 6.

The reading on the Loop Calibrator’s display

should be within the minimum and maximum

values shown in Table 4.

Table 3. Recommended Equipment

Equipment Minimum Specification Recommended Model or Equivalent

DC Calibrator DC Voltage: 0 to 30 V

Accuracy: ±0.005 % +50 µV

DC Current 0 to 24 mA Accuracy: ±0.01% +0.25 µA

Fluke 5500A Multi-Product Calibrator

Digital Multimeter DC Current: 0 to 26 mA

Accuracy: ±73 ppm

HP 3458A

Flexible Test

Leads Fluke TL24

Loop Calibrator

Calibration Adjustment Procedure

Table 4. DC Current Source / Current Measure / Voltage Measure Mode Tests

Test No. 705 Loop Calibrator Output Switch

Position HP 3458A Minimum HP 3458A Maximum

4.000 mA

12.000 mA

24.000 mA

Center

3.997 mA

11.995 mA

23.993 mA

4.003 mA

2.005 mA

24.007 mA

5500A Calibrator Output Switch

Position Fluke 705 Minimum Fluke 705 Maximum

4.000 mA

12.000 mA

24.000 mA

Center

3.997 mA

11.995 mA

23.993 mA

4.003 mA

12.005 mA

24.007 mA

5500A Calibrator Output Switch

Position Fluke 705 Minimum Fluke 705 Maximum

0.000 V

14.000 V

28.000 V

Right

-0.001 V

13.995 V

27.992 V

0.001 V

14.005 V

28.008 V

DC Current Measurement Mode

1. Set the rotary switch on the Loop Calibrator to

VMEASURE.

The Loop Calibrator’s display should read V.

2. Connect the test leads from the output NORMAL

terminals of the Fluke 5500A to the input

terminals on the Loop Calibrator (Black to COM

and red to [+] ).

3. Set the Fluke 5500A to test 7 in Table 4 and

verify the display reading on the Loop Calibrator.

Repeat for tests 8 and 9.

The reading on the display should be within the

minimum and maximum values shown in

Table 4.

4. Set 5500A output to 0 V (zero), and set output to

STANDBY.

5. Turn the rotary switch of the Loop Calibrator to

OFF and disconnect the Loop Calibrator from the

5500A.

The performance verification tests are now

complete.

If the Loop Calibrator failed any of these tests,

calibration adjustment or repair is required.

Calibration Adjustment Procedure

Perform the following calibration adjustment

procedures if the Loop Calibrator fails the

performance verification test.

Notes

Make sure that the Loop Calibrator has a

new battery before starting the calibration

procedure. Calibration will not function

properly if low battery indicator Mis on.

Because the Fluke 705 Loop Calibrator

incorporates several key hold start up

features, entering the CAL mode through the

keypad requires an exact key hold sequence.

1. With the rotary switch in the OFF position, hold

down the Pkey and turn the rotary switch to V

MEASURE.

2. When CAL appears, press and hold the Pand

the Mkeys. Immediately release both keys when

CAL disappears. Verify that the display shows

MEASURE 0.000V with no – sign or fluctuating

digits. If it does not, CAL mode has not been

successfully entered.

3. Connect the test leads from the output NORMAL

terminals of the Fluke 5500A to the terminals on

the Loop Calibrator (Black to COM and red

to [+] ).

Fluke 705

Calibration Information

4. Set the 5500A output to 0 V dc and select O.

5. Press any key until the Loop Calibrator’s display

changes.

6. When the display shows 28.000 V, set the 5500A

output to 28 V dc.

7. Press any key until the Loop Calibrator’s display

changes.

8. When the display shows HHHH, place the 5500A

in the STANDBY mode.

9. Press any key until the Loop Calibrator’s display

changes.

10. Turn the Loop Calibrator’s rotary switch to mA.

11. Press any key until the Loop Calibrator’s display

changes.

12. Connect the test leads from the AUX terminals of

the Fluke 5500A to the terminals on the Loop

Calibrator (black to COM and red to [+]).

13. Set the 5500A output to 0 mA dc and select O.

14. Press any key until the Loop Calibrator’s display

changes.

15. When the display shows 20.000 mA, set the

5500A output to 20.000 mA.

16. Press any key until the Loop Calibrator’s display

changes.

17. When the display shows HHHH, place the 5500A

in the STANDBY mode and remove any test lead

connections to the Loop Calibrator.

18. Short the terminals and press any key. The Loop

Calibrator now enters a self-source calibration

adjustment process. The output must be shorted

during this step.

The Loop Calibrator resets power when the self-

source calibration adjustment is complete.

Note

The Loop Calibrator resets to the current

source function prior to entering the self-

source calibration procedure, i.e., 0.000 mA

for 0-20 mA loop or 4.000 mA for 4-20 mA

loop.

19. Remove all connections and place the rotary

switch of the Loop Calibrator to OFF.

The calibration procedure is now complete.

User-Replaceable Parts

User-replaceable parts, are listed in Table 5 and

shown in in Figure 3.

Table 5. User-Replaceable Parts

Item Description Part No. Quantity

Lens 665114 1

Case top 665098 1

LCD 665122 1

Elastomeric strip (LCD to PCA) 867247 1

Elastomeric strip 867242 1

Keypad assembly 665117 1

Actuator switch 203445 1

Switch support assembly 879031 1

Case bottom 665109 1

Screws, phillips-head 832246 4

Foot, non-skid (rubber) 885884 1

Battery, 9V ANSI/NEDA 1604A or IEC6LR61 696534 1

Battery door 665106 1

Main PCA 800893 1

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