Fluke 705 User manual

PN 667345 December 1998, Rev.1, 12/99
©1998, 1999 Fluke Corporation, All rights reserved. Printed in U.S.A.
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
•[phone] in Europe
•[phone] in Japan
•[phone] in Singapore
•[phone] from other countries

Fluke 705
Calibration Information
2
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
3
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
4
Case, Top
Lens
Keypad Assembly
Actuator Switch
Main PCA
Foot
LCD
Elastomeric Strip
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
5
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.
1
2
3
Snap
Snap Snaps
AAK02F.EPS
Figure 3. Removing and Reinserting the Printed Cirsuit Assembly (PCA)

Fluke 705
Calibration Information
6
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
7
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
1
2
3
4.000 mA
12.000 mA
24.000 mA
Center
Center
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
5
6
4.000 mA
12.000 mA
24.000 mA
Center
Center
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
7
8
9
0.000 V
14.000 V
28.000 V
Right
Right
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
8
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