Fluke 7526A Operating Manual

7526A

Precision Process Calibrator

March 2013

© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

Calibration Manual

LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under
normal use and service. The warranty period is one year and begins on the date of shipment.
Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the
original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses,
disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered,
neglected, contaminated, or damaged by accident or abnormal conditions of operation or
handling. Fluke warrants that software will operate substantially in accordance with its functional
specifications for 90 days and that it has been properly recorded on non-defective media. Fluke
does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user
customers only but have no authority to extend a greater or different warranty on behalf of Fluke.
Warranty support is available only if product is purchased through a Fluke authorized sales outlet
or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for
importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of
charge repair, or replacement of a defective product which is returned to a Fluke authorized
service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the
difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in
transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid
(FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination,
alteration, accident, or abnormal condition of operation or handling, including overvoltage failures
caused by use outside the product’s specified rating, or normal wear and tear of mechanical
components, Fluke will provide an estimate of repair costs and obtain authorization before
commencing the work. Following repair, the product will be returned to the Buyer transportation
prepaid and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM
ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or
exclusion or limitation of incidental or consequential damages, the limitations and exclusions of
this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or
unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not
affect the validity or enforceability of any other provision.

Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.

Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands

11/99

Table of Contents

Title Page

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

Contact Fluke Calibration .................................................................................. 1

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

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

Resistance Specifications, Output ................................................................. 6

RTD and Thermistor Specification, Output .................................................. 8

Maintenance ....................................................................................................... 10

Clean the Product .......................................................................................... 10

Replace a Line Fuse ....................................................................................... 10

Change the Line Voltage ............................................................................... 11

Performance Tests .............................................................................................. 12

Required Test Equipment .............................................................................. 12

DC Voltage .................................................................................................... 13

DC Current .................................................................................................... 14

Thermocouple Output .................................................................................... 15

CJC (Cold Junction Compensation) .............................................................. 16

Thermocouple Input ...................................................................................... 17

Ohms Output ................................................................................................. 18

Ohms Input .................................................................................................... 19

Pressure Modules ........................................................................................... 22

Isolated DC Voltage ...................................................................................... 23

Isolated DC Current ....................................................................................... 24

Isolated Loop Power ...................................................................................... 24

Calibration Adjustment ...................................................................................... 25

Initiate Communication ................................................................................. 25

Starting Adjustment Mode ............................................................................ 25

Adjustment Sequence .................................................................................... 26

Steps 1 through 4: DC mV and DC V Source Adjustment ............................ 26

Step 5: 100 mA Source - DC Current Source Adjustment ............................ 27

Steps 6 and 7: Hi Ohms Source and Low Ohms Source Adjustment ............ 28

Steps 8 through 11: 100 Ohms Measure, Resistance Measure Adjustment .. 29

Step 12: TC SOURCE, TC mV Source Adjustment ..................................... 30

Step 13: TC Read, TC mV Measure Adjustment .......................................... 31

Step 14: TC Cold Junction Temperature (TC CJC) Adjustment ................... 31

Step 15: mA Read Adjustment ...................................................................... 31

Step 16: 10 V Read Adjustment .................................................................... 32

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7526A

Calibration Manual

Step 17: 100 V Read Adjustment .................................................................. 33

User-Replaceable Parts ...................................................................................... 34

Accessories ........................................................................................................ 36

ii

List of Tables

Table Title Page

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

2. Replacement Fuses ................................................................................................. 10

3. Required Equipment ............................................................................................... 12

4. DC Voltage Verification ........................................................................................ 13

5. DC Current Verification ......................................................................................... 14

6. TC mV Test ............................................................................................................ 15

7. Ohms Output Ranges ............................................................................................. 18

8. Ohms Ratio Table .................................................................................................. 20

9. Isolated DC Voltage ............................................................................................... 23

10. Isolated DC Current ............................................................................................... 24

11. User-Replaceable Parts .......................................................................................... 34

12. Accessories ............................................................................................................. 36

iii

7526A

Calibration Manual

iv

List of Figures

Figure Title Page

1. Replace the Line Fuse ............................................................................................ 11

2. DC Current Performance Test Connections ........................................................... 14

3. Thermocouple Output Performance Test Connections .......................................... 15

4. CJC Performance Test Connections ....................................................................... 16

5. TC Input Performance Test Connections ............................................................... 17

6. Resistance Output Performance Test Connections ................................................ 18

7. Ohms Input Performance Test Connections ........................................................... 19

8. Ohms Measurement Performance Test Connections ............................................. 21

9. Pressure Module Performance Test Connections ................................................... 22

10. Isolated DC Voltage Performance Test Connections ............................................. 23

11. Isolated DC Current Performance Test Connections ............................................. 24

12. DC Volts Source Performance Test Connections .................................................. 27

13. High and Low Ohms Adjustment Connections ...................................................... 27

14. Hi Ohms Source and Low Ohms Source Adjustment Connections ....................... 28

15. 100 Ohms Measure, Resistance Measurement Adjustment Connections .............. 29

16. mA Read Adjustment Connections ........................................................................ 32

17. 10 V Read Adjustment Connections ...................................................................... 33

18. User-Replaceable Parts .......................................................................................... 35

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7526A

Calibration Manual

vi 1

Introduction

Warning

To prevent possible electrical shock, fire, or personal injury,
read all safety information before you use the Product.

This manual contains the verification and calibration adjustment procedures for the
7526A Precision Process Calibrator (the Product). Please see the 7526A Users Manual
for usage information.

The Product is an accurate, full-featured temperature, pressure, and dc calibrator. It is
meant for research and development, manufacturing, and calibration laboratory
procedures.

Contact Fluke Calibration

To contact Fluke Calibration, call one of the subsequent telephone numbers:

• Technical Support USA: 1-877-355-3225

• Calibration/Repair USA: 1-877-355-3225

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

• Europe: [phone]

• Japan: [phone]

• Singapore: [phone]

• China: [phone]

• Brazil: [phone]

• Anywhere in the world: [phone]
To see product information and download the latest manual supplements, visit Fluke

Calibration’s website at www.flukecal.com.
To register your product, visit http://flukecal.com/register-product.

7526A

Calibration Manual

Safety Information

A Warning identifies conditions and procedures that are dangerous to the user. A
Caution identifies conditions and procedures that can cause damage to the Product or

the equipment under test.

Warnings

To prevent possible electrical shock, fire, or personal injury:

• Read all safety Information before you use the Product.

• Carefully read all instructions.

• Use the Product only as specified, or the protection

supplied by the Product can be compromised.

• Use this Product indoors only.

• Examine the case before you use the Product. Look for

cracks or missing plastic. Carefully look at the insulation

around the terminals.

• Use only the mains power cord and connector approved for

the voltage and plug configuration in your country and rated

for the Product.

• Replace the mains power cord if the insulation is damaged

or if the insulation shows signs of wear.

• Make sure the ground conductor in the mains power cord is

connected to a protective earth ground. Disruption of the

protective earth could put voltage on the chassis that could

cause death.

• Do not put the Product where access to the mains power

cord is blocked.

• Do not touch voltages >30 V ac rms, 42 V ac peak, or

60 V dc.

• Use only cables with correct voltage ratings.

• Do not apply more than the rated voltage, between the

terminals or between each terminal and earth ground.

• Do not use the Product around explosive gas, vapor, or in

damp or wet environments.

• Remove all probes, test leads, and accessories that are not

necessary for the measurement.

• Do not use the Product if it operates incorrectly.

• Do not use and disable the Product if it is damaged.

2

Precision Process Calibrator

Safety Information

Table 1 shows the symbols used on the Product and in this manual.

Table 1. Symbols

Symbol Definition Symbol Definition

This product complies with the WEEE
Directive (2002/96/EC) marking
requirements. The affixed label
indicates that you must not discard this
electrical/electronic product in domestic
household waste. Product Category:



Risk of Danger. Important information.
See Manual.



With reference to the equipment types
in the WEEE Directive Annex I, this
product is classed as category 9
"Monitoring and Control
Instrumentation” product. Do not
dispose of this product as unsorted
municipal waste. Go to Fluke’s website
for recycling information.



Hazardous voltage. Risk of electric
shock.

 Fuse

 AC (Alternating Current)  Protective Earth Ground

 Earth Terminal 





AC (Alternating Current) and DC (Direct
Current)

This product has been tested to the
requirements of CAN/CSA-C22.2
No. 61010-1, third edition.

 DC (Direct Current)

 Pressure

Conforms to European Union
directives.

3

7526A

Calibration Manual

Specifications

General Specifications

Warm-up Time ....................................... Twice the time since last warmed up, to a maximum of 30 minutes

Settling Time ......................................... Less than 5 seconds for all functions and ranges except as noted

Standard Interfaces .............................. RS-232

Temperature Performance

Temperature Coefficient ....................... Temperature coefficient for temperatures outside tcal 5 °C is 10 % of the 90-day

Relative Humidity

Altitude

Operating .......................................... 3,000 m (9,800 ft) maximum

Non-operating ................................... 12,200 m (40,000 ft) maximum

Safety .................................................... EN/IEC 61010-1, ANSI/ISA 61010-1, CAN/CSA 22.2 No. 61010-1

EMC ........................................................ Complies with EN/IEC 61326-1, EN/IEC 61326-2-1 for controlled EM

Analog Low Isolation ............................ 20 V

Line Power Line Voltage (selectable)

120 V~ ................................................... 100 V to 120 V

240 V~ .................................................... 220 V to 240 V

Line Frequency ..................................... 47 to 63 Hz

Line Voltage Variation .......................... ±10 % about setting

Power Consumption ............................ 15 VA maximum

Dimensions

Weight (without options) ...................... 4.24 kg (9.35 lb)

IEEE-488 (GPIB)

Operating ........................................ 0 °C to 50 °C

Calibration (tcal) ............................. 18 °C to 28 °C

Storage ........................................... -20 °C to 70 °C

specification (or 1 year if applicable) per °C

Operating ........................................ <80 % to 30 °C

<70 % to 40 °C
<40 % to 50 °C

environments except when used in the following conditions:

• In electromagnetic fields from 0.08-2.7 GHz in excess of 1V/m.

• When subjected to electrostatic discharge (ESD) to the binding posts. Good

static awareness practices should be followed when handling this product
such as discharging any built up static charge to the product chassis prior to
handling terminals or test connections.

• When the product is used with data I/O cables in excess of 3 m.

Height ............................................. 14.6 cm (5.75 inch)

Width ............................................... 44.5 cm (17.5 inch)

Depth .............................................. 29.8 cm (11.75 inch) overall

4

Precision Process Calibrator

Specifications

DC Voltage Specifications, Output

Absolute Uncertainty, tcal ±5°C,

Ranges

[1]

±(ppm of output +µV)

90 Days 1 Year

0 mV to 100.000 mV 25 3 30 3

0 V to 1.00000 V 25 10 30 10

0 V to 10.0000 V 25 100 30 100

0 V to 100.000 V 25 1 mV 30 1 mV 5 ppm + 1 mV 1 mV 1 mA

[1] All outputs are positive only, unless otherwise noted.
[2] Remote sensing is not provided. Output resistance is < 1Ω.

Noise

Ranges

0 mV to 100.000 mV

0 V to 1.00000 V

0 V to 10.0000 V

Bandwidth 0.1 to 10 Hz p-p

±(ppm of output +µV)

1 μV 6 μV

10 μV 60 μV

100 μV 600 μV

0 V to 100.000 V 10 ppm+1 mV 20 mV

Stability

24 hours, ±1 °C

Resolution

±(ppm of output +μV)

5 ppm + 2 μV 1 μV

4 ppm + 10 μV 10 μV

4 ppm + 100 μV 100 μV

Bandwidth 10 Hz to

10 kHz rms µV

Maximum
Burden

[2]

10 mA

10 mA

10 mA

DC Voltage Specifications, Thermocouple Jack, Input and Output

Absolute Uncertainty, tcal ±5°C,

Ranges

[1]

±(ppm of output +µV)

90 Days 1 Year

-10 to 75.000 mV 25

[1] All outputs are positive only, unless otherwise noted.
[2] Remote sensing is not provided. Output resistance is < 1Ω.

2 μV

30

2 μV 5 ppm + 2 μV 1 μV 10 Ω

Stability

24 hours, ±1 °C

±(ppm of output +μV)

Resolution

Maximum
Burden

[2]

DC Voltage Specifications, Isolated Input

Ranges

0 V to 10.0000 V 50 0.2

0 V to 100.000 V 50 2.0 1 mV

Absolute Uncertainty, tcal ±5 °C,

±(ppm of reading + mV)

Resolution

100 μV

DC Current Specifications, Output

Absolute Uncertainty, tcal ±5 °C,

± (ppm of output + µA)

Ranges

[1]

90 Days 1 Year

0 mA to 100.000 mA 40

[1] All outputs are positive only.
[2] For line voltages less than 95 V (±100 ppm of reading)

[2]

1 50

[2]

1

Ranges

Bandwidth 0.1 to 10 Hz p-p

0 mA to 100.000 mA 2000 nA

Resolution

1 μA

Noise

Bandwidth 10 Hz to 10 kHz rms μV

Maximum

Compliance

Voltage

12 V 100 mH

20 μA

DC Current Specifications, Isolated Input

Ranges

0 mA to 50.0000 mA 100 1

0 mA to 24.0000 mA (Loop Power)

[1] Loop Power: 24 V ±10 %
[2] HART Resistor: 250 Ω ±3 %

[1][2]

Absolute Uncertainty, tcal ±5 °C,

±(ppm of reading + μA)

100 1

Resolution

0.1 μA

0.1 μA

Maximum

Inductive

Load

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7526A

Calibration Manual

Resistance Specifications, Output

5 Ω to 400.000 Ω
5 Ω to 4.00000 kΩ

[1] For currents lower than shown, the specification becomes

For example, a 500 μA stimulus that measures 100 Ω has a specification of: 0.015 Ω x 1 mA/500 μA=0.03 Ω

Resistance Specifications, Input

0 Ω to 400.000 Ω ±20 ppm + 0.0035 Ω ±20 ppm + 0.004 Ω 0.001 Ω
0 Ω to 4.00000 kΩ ±20 ppm + 0.035 Ω ±20 ppm + 0.04 Ω 0.01 Ω

Absolute Uncertainty,

Ranges

New Spec. = Stated Spec. x Imin/Iactual.

Ranges

tcal ±5 °C, ± Ohms

90 Days 1 Year

0.012 0.015

0.25 0.3

Absolute Uncertainty, tcal ±5 °C

90 Days 1 Year

±(ppm of reading + Ω)

Resolution Nominal Current

0.001 Ω

0.01 Ω 100 μA to 1 mA

Resolution Stimulus Current

1 to 3 mA

1 mA

0.1 mA

[1]

Thermocouple Specification, Output and Input

Range (°C)

800 °C
1550 °C
1820 °C

1000 °C
1800 °C
2000 °C
2316 °C

-200 °C

-100 °C
0 °C
600 °C
1000 °C

-100 °C
800 °C
1200 °C

-200 °C

-100 °C
500 °C
800 °C
1372 °C

-100 °C
900 °C

-200 °C

-100 °C
0 °C
100 °C
800 °C
1300 °C

TC Type

B

C

E

J

K

L

N

Minimum Maximum 90 days 1 Year

600 °C
800 °C
1550 °C

0 °C
1000 °C
1800 °C
2000 °C

-250 °C

-200 °C

-100 °C
0 °C
600 °C

-210 °C

-100 °C
800 °C

-250 °C

-200 °C

-100 °C
500 °C
800 °C

-200 °C

-100 °C

-250 °C

-200 °C

-100 °C
0 °C
100 °C
800 °C

Absolute Uncertainty, tcal ±5 °C, ±(°C)

Output/Input

0.35 °C

0.28 °C

0.21 °C

0.15 °C

0.22 °C

0.24 °C

0.32 °C

0.24 °C

0.10 °C

0.07 °C

0.06 °C

0.08 °C

0.13 °C

0.07 °C

0.08 °C

0.45 °C

0.15 °C

0.08 °C

0.09 °C

0.11 °C

0.08 °C

0.07 °C

0.72 °C

0.22 °C

0.11 °C

0.09 °C

0.08 °C

0.10 °C

0.35 °C

0.28 °C

0.22 °C

0.16 °C

0.23 °C

0.26 °C

0.35 °C

0.25 °C

0.12 °C

0.09 °C

0.08 °C

0.10 °C

0.14 °C

0.09 °C

0.10 °C

0.46 °C

0.16 °C

0.10 °C

0.10 °C

0.13 °C

0.10 °C

0.09 °C

0.73 °C

0.23 °C

0.12 °C

0.11 °C

0.10 °C

0.12 °C

[1]

6

Precision Process Calibrator

Specifications

TC Type

R

S

T

U

XK

Range (°C)

Minimum Maximum 90 days 1 Year

-50 °C

-25 °C
0 °C
100 °C
400 °C
600 °C
1000 °C
1600 °C

-50 °C

-25 °C
0 °C
100 °C
400 °C
600 °C
1000 °C
1600 °C

-250 °C

-200 °C

-100 °C
0 °C
200 °C

-200 °C
0 °C
200 °C

-200 °C

-100 °C
0 °C
600 °C

-25 °C
0 °C
100 °C
400 °C
600 °C
1000 °C
1600 °C
1767 °C

-25 °C
0 °C
100 °C
400 °C
600 °C
1000 °C
1600 °C
1767 °C

-200 °C

-100 °C
0 °C
200 °C
400 °C

0 °C
200 °C
600 °C

-100 °C
0 °C
600 °C
800 °C

Absolute Uncertainty, tcal ±5 °C, ±(°C)

Output/Input

0.54 °C

0.44 °C

0.38 °C

0.27 °C

0.21 °C

0.19 °C

0.18 °C

0.21 °C

0.51 °C

0.43 °C

0.37 °C

0.28 °C

0.22 °C

0.21 °C

0.20 °C

0.24 °C

0.34 °C

0.14 °C

0.09 °C

0.07 °C

0.06 °C

0.15 °C

0.08 °C

0.07 °C

0.10 °C

0.07 °C

0.06 °C

0.07 °C

0.55 °C

0.45 °C

0.39 °C

0.28 °C

0.22 °C

0.21 °C

0.19 °C

0.23 °C

0.51 °C

0.43 °C

0.38 °C

0.29 °C

0.23 °C

0.22 °C

0.22 °C

0.26 °C

0.35 °C

0.16 °C

0.11 °C

0.09 °C

0.09 °C

0.16 °C

0.10 °C

0.10 °C

0.11 °C

0.09 °C

0.08 °C

0.09 °C

[1]

0 °C
200 °C

BP

[1] Does not include thermocouple wire error.

Type B, E, J ,K, N, R, S and T are based on ITS-90
Type L and U are based on DIN 43710-1985
Type C is based on ASTM standard E 988-96
Type XK and BP are based on GOST R 8.585-2001

600 °C
800 °C
1600 °C
2000 °C

200 °C
600 °C
800 °C
1600 °C
2000 °C
2500 °C

0.17 °C

0.14 °C

0.15 °C

0.22 °C

0.26 °C

0.38 °C

0.18°C

0.16 °C

0.17 °C

0.23 °C

0.28 °C

0.40 °C

7

7526A

Calibration Manual

RTD and Thermistor Specification, Output

RTD Types

Pt 385, 100 Ω -200 °C 800 °C 0.04 °C 0.05 °C
Pt 3926, 100 Ω -200 °C 630 °C 0.04 °C 0.05 °C
Pt 3916, 100 Ω -200 °C 630 °C 0.04 °C 0.05 °C

Pt 385, 200 Ω

Pt 385, 500 Ω -200 °C 630 °C 0.15 °C 0.17 °C
Pt 385, 1000 Ω -200 °C 630 °C 0.07 °C 0.09 °C
Ni 120, 120 Ω -80 °C 260 °C 0.02 °C 0.02 °C
Cu 427, 10 Ω

YSI 400

[1] 2-wire output
[2] Based on MINCO Application Aid No. 18

RTD and Thermistor Specification, Input

Pt 385, 100 Ω

Pt 3926, 100 Ω

RTD Type

Range °C

Minimum Maximum 90 Days 1 Year

-200 °C
400 °C

[2]

-100 °C 260 °C 0.30 °C 0.38 °C
15 °C 50 °C 0.005 °C 0.007 °C

Range (°C)

Minimum Maximum 90 Days 1 Year

-200 °C

-80 °C
100 °C
300 °C
400 °C
630 °C

-200 °C

-80 °C
0 °C
100 °C
300 °C
400 °C

400 °C
630 °C

-80 °C
100 °C
300 °C
400 °C
630 °C
800 °C

-80 °C
0 °C
100 °C
300 °C
400 °C
630 °C

Absolute Uncertainty, tcal ±5 °C ±(°C)

0.35 °C

0.42 °C

Absolute Uncertainty, tcal ±5 °C, ±(°C)

Output/Input

0.012 °C

0.018 °C

0.022 °C

0.025 °C

0.031 °C

0.037 °C

0.012 °C

0.014 °C

0.016 °C

0.022 °C

0.022 °C

0.024 °C

0.40 °C

0.50 °C

0.013 °C

0.020 °C

0.024 °C

0.026 °C

0.033 °C

0.038 °C

0.013 °C

0.015 °C

0.017 °C

0.022 °C

0.026 °C

0.032 °C

[1]

[1]

8

Pt 3916, 100 Ω

Pt 385, 200 Ω

Pt 385, 500 Ω

-200 °C

-190 °C

-80 °C
0 °C
100 °C
300 °C
400 °C
600 °C

-200 °C

-80 °C
0 °C
100 °C
260 °C
300 °C
400 °C

-200 °C
0 °C
100 °C
300 °C
400 °C

-190 °C

-80 °C
0 °C
100 °C
300 °C
400 °C
600 °C
630 °C

-80 °C
0 °C
100 °C
260 °C
300 °C
400 °C
630 °C

0 °C
100 °C
300 °C
400 °C
630 °C

0.009 °C

0.012 °C

0.014 °C

0.016 °C

0.021 °C

0.024 °C

0.030 °C

0.031 °C

0.047 °C

0.050 °C

0.053 °C

0.054 °C

0.062 °C

0.064 °C

0.079 °C

0.023 °C

0.026 °C

0.031 °C

0.035 °C

0.041 °C

0.010 °C

0.013 °C

0.015 °C

0.017 °C

0.022 °C

0.026 °C

0.031 °C

0.033 °C

0.053 °C

0.056 °C

0.060 °C

0.060 °C

0.069 °C

0.071 °C

0.088 °C

0.025 °C

0.028 °C

0.034 °C

0.038 °C

0.045 °C

Precision Process Calibrator

Specifications

RTD Type

Minimum Maximum 90 Days 1 Year

-200 °C
0 °C

Pt 385, 1000 Ω

Ni 120, 120 Ω
Cu 427, 10 Ω

YSI 400

SPRT

[1] 4-wire mode. Uncertainties shown do not include probe uncertainties.
[2] Based on MINCO Application Aid No. 18.

100 °C
300 °C
400 °C

-80 °C 260 °C 0.008 °C 0.009 °C

[2]

-100 °C 260 °C 0.097 °C 0.110 °C
15 °C 50 °C 0.005 °C 0.007 °C

-200 °C 660 °C 0.05 °C 0.06 °C

Range (°C)

0 °C
100 °C
300 °C
400 °C
630 °C

Absolute Uncertainty, tcal ±5 °C, ±(°C)

Output/Input

0.014 °C

0.017 °C

0.022 °C

0.024 °C

0.031 °C

0.015 °C

0.018 °C

0.024 °C

0.026 °C

0.033 °C

[1]

Pressure Measurement Specifications

The Calibrator can accept the Fluke 700 or 525A-P Series pressure modules. Pressure modules connect directly into the
front panel Lemo connector with the Calibrator firmware auto-detecting the type and value of the module you connect.

Range Accuracy and Resolution Units

Determined by the pressure module Determined by the pressure module PSI (pounds per square inch)

in H2O 4 °C (inches of water at 4
degrees Celsius)

in H2O 20 °C (inches of water at 20
degrees Celsius)

in H2O 60 °C (inches of water at 60
degrees Fahrenheit)

cm H2O 4 °C (centimeters of water
at 4 degrees Celsius)

cm H2O 20 °C (centimeters of
water at 20 degrees Celsius)

mm H2O 4 °C (millimeters of water
at 4 degrees Celsius)

mm H2O 20 °C (millimeters of
water at 20 degrees Celsius)

BAR (bars)

mBAR (millibars)

kPa (kilopascals)

MPa (megapascals)
in HG 0 °C (inches of mercury at 0

degrees Celsius)
mm HG 0 °C (millimeters of

mercury at 0 degrees Celsius)

kg/cm2 (kilograms per square
centimeter)

Switch Test Specifications, Isolated Input

Contact Closure Resistance

Excitation Current 27 mA Max

<1 kΩ

9

7526A

Calibration Manual

Maintenance

Clean the Product

Replace a Line Fuse

This section explains typical maintenance and tasks necessary to keep the Product in
service.

Warnings

To prevent possible electrical shock, fire, or personal injury:

• Have an approved technician repair the Product.

• Disconnect the mains power cord before you remove the

Product covers.

• Do not operate the Product with covers removed or the case

open. Hazardous voltage exposure is possible.

• Use only specified replacement parts.

Clean the Product and pressure modules with a soft cloth dampened with water, or mild
soap and water.

The line power fuses and line voltage selector are found in the compartment above the
power switch on the right rear side of the Product. Table shows the correct replacement
fuse for each line voltage setting.

Table 2. Replacement Fuses

Fuse Description Line Voltage Setting

 0.25 A/250 V (SB) 120 V (Operating Range 90 V to 132 V)

 0.125 A/250 V (SB) 240 V (Operating Range 198 V to 264 V)

To ensure safety, use exact replacement only.

To examine or replace a fuse:

1. Disconnect the mains power.

2. Use a flat-head screwdriver to pry up the tab at the base of the line fuse compartment.

Insert the blade into the center slot under the tab. The compartment cover will come
part way out. See Figure 1.

3. Remove the compartment cover. The fuses come out with the compartment cover and

can be examined or replaced.

4. To install the fuse holder, push the compartment cover back into the compartment

until the tab locks in position.

10

Precision Process Calibrator

I

o

Maintenance

Change the Line Voltage

The Product comes from the factory configured for the line voltage applicable for the
country of purchase, or as specified when it is ordered. To verify the line voltage setting,
examine the line voltage indicator on the power line fuse compartment cover.

Make sure that the line voltage selection is set for 120 V for line voltages between 100 V
and 120 V ±10 % about setting. The selector must be set to 240 V for line voltages
between 220 V and 240 V ±10 % about setting.

Changing Line Fuse

Figure 1. Replace the Line Fuse

gxm009.eps

11

7526A

Calibration Manual

Performance Tests

Required Test Equipment

Warning

To prevent possible electrical shock, fire, or personal injury, do
not perform the performance test procedures unless the
Product is fully assembled.

The performance tests verify the complete operation of the Product and measure the
accuracy of each function against Product specifications. If the Product fails a part of the
test, calibration adjustment or repair is necessary. See “Calibration Adjustment”.

The equipment listed in Table 3 is necessary to do the performance tests and calibration
adjustment.

Table 3. Required Equipment

Equipment Recommended Model Where Used

8-1/2 digit Precision Digital
Multimeter (DMM)

Ohms shorting block

1 Ω Resistance Standard Fluke 742A-1 DC current

Resistance standard, 10 Ω Fluke 742A-10 100 mA source calibration

Resistance standard, 100 Ω Fluke 742A-100

1 KΩ Resistance Standard Fluke 742A-1K Resistance

10 KΩ Resistance Standard Fluke 742A-10K Resistance

Multifunction Calibrator Fluke 5522A DC volts, dc current, resistance

Thermistor probe Fluke5640-D TC CJC calibration

Thermocouple probe

Pressure Module Any Fluke 700 Series Module Pressure

Lead Set 5520A-525A/LEADS Leads Kit Necessary test cables

Precision Thermistor Fluke 5640-D Temperature

Fluke 8508A DC volts, dc current, resistance

Low ohms measure and SPRT
calibration and high ohms
measure calibration

Low ohms measure and SPRT
calibration

Omega E-type thermocouple
probe

TC CJC calibration

12

Thermometer Readout Fluke 1504 Temperature

Dewar Flask with Lid - - - Thermocouple

Characterized Type E
Thermocouple

Banana Jack to Copper TC Mini­connector

Lag bath TC CJC calibration

- - - Thermocouple

- - - Thermocouple

Precision Process Calibrator

Performance Tests

DC Voltage

The dc voltage performance test verifies the accuracy of the Volts Source output from
the front panel of the Product. Verify the measurements shown in Table 4 with a digital
multimeter (DMM).

Table 4. DC Voltage Verification

Range Nominal Value Measured Value

0 V 3.00E-06 3.00E-06

0.035 V 3.88E-06 4.05E-06

100 mV

0.065 V 4.63E-06 4.95E-06

0.1 V 5.50E-06 6.00E-06

0 V 1.00E-05 1.00E-05

0.35 V 1.88E-05 2.05E-05

1.0 V

0.65 V 2.63E-05 2.95E-05

1 V 3.50E-05 4.00E-05

0 V 1.00E-04 1.00E-04

3.5 V 1.88E-04 2.05E-04

10.0 V

6.5 V 2.63E-04 2.95E-04

10 V 3.50E-04 4.00E-04

0 V 1.00E-03 1.00E-03

35 V 1.88E-03 2.05E-03

100.0 V
65 V 2.63E-03 2.95E-03

90-Day

Specification

(V)

1-Year

Specification

(V)

100 V 3.50E-03 4.00E-03

13

7526A

O

Calibration Manual

DC Current

The dc current performance test verifies the accuracy of the current output from the front
panel of the Product. Use the 8508A and the precision shunt to measure the Product
output. Divide the voltage indication from the 8508A by the 742A-1 actual value to
determine the current output. Verify the measurements shown in Table 5. See Figure 2
for connections.

Table 5. DC Current Verification

100 mA

Output

Volt

Current

(I=E/R)

742A-1 Shunt

Value

90-Day

Specification

1-Year

Specification

Direct into
8508A

0.000 mA

Current Input,

1.0 μA 1.0 μA

Autorange

35.000 mA 2.4 μA 2.75 μA

65.000 mA 3.6 μA 4.25 μA

100.000 mA 5 μA 6 μA

7526A

8508A

PRECISION PROCESS CALIBRAT

7526A

Current Shunt

OUTPUT

100V MAX

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

4

W RTD/

INPUT

100mA MAX

HI

LO

HI

LO

RTD/

mA

OUTPUT

HI

LO

SENSE

14

gxm010.eps

Figure 2. DC Current Performance Test Connections

Precision Process Calibrator

Performance Tests

Thermocouple Output

The thermocouple (TC) output performance test verifies the accuracy of the TC output on
the front panel of the Product. Thermocouple mV specifications will be used for this test.
When this test is combined with the cold junction compensation (CJC) test, all functions
of the TC output are checked. The cable necessary to connect the Product to the 8508A
will need to be constructed. The TC mini-connector needs copper-copper (white). With
copper wire, connect the mini-connector to standard banana jacks. See Figure 3 for
connections.

1. Push  and then  to select TC output.

2. Push  until mV/°C shows on the display.

3. Output the mV values listed in Table 6.

Table 6. TC mV Test

Nominal Voltage 90-Day Specification 1-Year Specification

-10.000 mV 3.125 μV 3.15 μV

15.000 mV 3.375 μV 3.45 μV

35.000 mv 3.750 μV 3.90 μV

55.000 mV 4.250 μV 4.50 μV

75.000 mV 4.750 μV 5.10 μV

8508A

7526A

VOLTS

OUTPUT

100V MAX

20V PK

MAX

4

CURRENT

20V PK

MAX

7526A

PRECISION PROCESS CALIBRATOR

mA

100mA MAX

HI

HI

LO

W RTD/

INPUT

HI

LO

HI

LO

SENSE

RTD/

OUTPUT

TC

INPUT/OUTPUT

20V PK

MAX

Figure 3. Thermocouple Output Performance Test Connections

gxm011.eps

15

7526A

Calibration Manual

CJC (Cold Junction Compensation)

The CJC performance test verifies the accuracy of the cold junction compensation of the
Product. Connect a Type-E thermocouple to the TC terminals on the Product. Immerse
the thermocouple and a precision thermometer in a mineral oil lag bath. See Figure 4 for
connections.

1. Push  then  to switch to TC input.

2. Push  then  to turn on the internal junction. XCJC is not shown when the

internal junction is used.

3. Push  until Type E is shown on the display.

Make sure that the indications of the Product and the precision thermometer are within
the Type-E specifications:

• 90-Day specification is 0.06 °C

• 1-Year specification is 0.08 °C

7526A

OUTPUT

100V MAX

20V PK

MAX

CURRENT

20V PK

MAX

PRECISION PROCESS CALIBRATOR

7526A

VOLTS

100mA MAX

HI

LO

4

W RTD/

INPUT

HI

LO

RTD/

mA

OUTPUT

HI

HI

LO

SENSE

TC

INPUT/OUTPUT

20V PK

MAX

Figure 4. CJC Performance Test Connections

Precision

Thermometer

Dewar Flask
and Cap

Mineral Oil
Lag Bath

gxm012.eps

16

Note

Typical Type-E thermocouples do not have specifications accurate enough
to be used as a standard. To maintain a good test uncertainty ratio (TUR),
a characterized Type-J thermocouple can be used.

Precision Process Calibrator

CURRENT

OUTPUT

HI

VOLTS

mA

RTD/

OUTPUT

HI

LO

HI

LO

LO

TC

SENSE

INPUT/OUTPUT

4

W RTD/

INPUT

20V PK

MAX

100 V MA X

100 mA MAX

20V PK

MAX

20V PK

MAX

PRECISION PROCESS CALIBRATOR

7526A

Performance Tests

Thermocouple Input

The TC input performance test verifies the accuracy of the TC input. Push  and then
 on the Product to set the Product to TC input. All Product conditions will be the

same as the Thermocouple Output test mode (CJC off, mV/ °C). Set the 5522A to the mV
values listed in Table 6. See Figure 5 for connections.

Calibrator

5522A

CALIBRATOR

Figure 5. TC Input Performance Test Connections

7526A

HI

gxm013.eps

17

7526A

Calibration Manual

Ohms Output

The ohms output performance test verifies the accuracy of the ohms output from the front
of the Product. Use the DMM to measure the ohms output. Apply the values shown in
Table 7. See Figure 6 for connections.

Note

Make sure the sense wires from the 8508A are on the bottom of the
stackable leads.

Push to select the 400 Ω, then the 4000 Ω range.

Note

The 8508A should be set to the 2 k
400

Ω

range. After the 1000 Ω measurement, the 8508A should be set to the

20 k

Ω

range with loI off. To prevent an overload, the 8508A must be in the

“loI” (low current mode) to measure 5

Ω

range when you measure the 7526A

Ω

in the 4 kΩ range.

7526A

400 Ω

8508A

OUTPUT

100 V MA X

20V PK

MAX

CURRENT

20V PK

MAX

PRECISION PROCESS CALIBRATOR

7526A

VOLTS

HI

LO

4

W RTD/

INPUT

HI

LO

mA

100 mA MAX

HI

HI

LO

SENSE

RTD/

OUTPUT

TC

INPUT/OUTPUT

20V PK

MAX

gxm014.eps

Figure 6. Resistance Output Performance Test Connections

Table 7. Ohms Output Ranges

Range Output 90-Day Specification 1-Year Specification

5 Ω 0.012 Ω 0.015 Ω

100 Ω 0.012 Ω 0.015 Ω

200 Ω 0.012 Ω 0.015 Ω

18

4000 Ω

300 Ω 0.012 Ω 0.015 Ω

400 Ω 0.012 Ω 0.015 Ω

5 Ω 0.25 Ω 0.30 Ω

1000 Ω 0.25 Ω 0.30 Ω

2000 Ω 0.25 Ω 0.30 Ω

3000 Ω 0.25 Ω 0.30 Ω

4000 Ω 0.25 Ω 0.30 Ω

Precision Process Calibrator

Performance Tests

Ohms Input

The ohms input performance test verifies the ohms input on the front of the Product.
Before an ohms input is measured, the ohms output of a 5522A must be “characterized”.
To get the necessary accuracy, the 8508A is used as a transfer standard and the 742A is
used as the reference standard. To find the true value of the 5522A output, use the ratio
input function of the 8508A. This is located on the front and rear panels. Connect the
742A to the front terminal and connect the 5522A to the rear terminals. Use four-wire
measure for both. See Figure 7 for connections.

8508A Front 8508A Rear

SENSE (4 WIRE )

INPUT (2 WIRE)

TRIG

5V PK MAX

ENABLE

DISABLE

CALIBRATION

REAR INPUT
CURRENT
FUSE.
F 1.6AH
5x20mm
IEC127

HI

LO

A

1420V

PK MAX

3A PK MAX

CAT I @ 1000V

PK MAX

HI

LO

GU

920V

Hi

Hi

Lo

Sense Hi

Sense Lo

742A

Lo

Sense Hi

Sense Lo

5520A

gxm015.eps

Figure 7. Ohms Input Performance Test Connections

19

7526A

Calibration Manual

Use the 742A-1K for the 400 Ω range. Use the 742A-10K for the 4 KΩ range. For more
information about how to use the ratio mode, see the 8508A Operators Manual. Note the
ratio indication on the 8508A in Table 8. Use the formula: (742A actual value/ratio
indication x 100 = actual 5522A actual value). Start with the 7526A in the 400 Ω range.
After the 400 Ω test, change the 7526A to the 4000 Ω range.

Table 8. Ohms Ratio Table

742A

Range

0 Ω 0.0035 Ω 0.004 Ω

25 Ω 0.004 Ω 0.0045 Ω

75 Ω 0.005 Ω 0.0055 Ω

95 Ω 0.0054 Ω 0.0059 Ω

100 Ω 0.0055 Ω 0.0060 Ω

105 Ω 0.0056 Ω 0.0061 Ω

150 Ω 0.0065 Ω 0.007 Ω

300 Ω 0.0095 Ω 0.010 Ω

400 Ω 0.0115 Ω 0.012 Ω

0 Ω 0.035 Ω 0.04 Ω

250 Ω 0.04 Ω 0.045 Ω

750 Ω 0.05 Ω 0.055 Ω

1000 Ω 0.055 Ω 0.06 Ω

1500 Ω 0.065 Ω 0.07 Ω

Value

(Ω)

Ratio

5522A
Actual

Value (Ω)

7526A

Reading

90-Day

Specification

1-Year

Specification

20

2000 Ω 0.075 Ω 0.08 Ω

3000 Ω 0.095 Ω 0.10 Ω

4000 Ω 0.115 Ω 0.12 Ω

Precision Process Calibrator

O

Performance Tests

To test the ohm input:

1. Apply a four-wire short to the Product 4W RTD/Ω input.

2. For the first test, set the Product to the 400 Ω range.

3. For the second test, connect the Product 4W RTD/Ω input to the output of the 5522A

as shown in Figure 8.

4. Set the Product to the 400 Ω range. Note the indication in Table 8.

5. Set the Product to the 4000 Ω range after the 400 Ω test. Note the indication in

Table 8.

6. Output the same nominal values and note the Product indication in the 7526A

Reading column of Table 8.

7. Subtract the 5522A Actual Value from the 7526A Reading and ensure that it is

within the specified tolerance.

Calibrator

CALIBRATOR

5522A

Figure 8. Ohms Measurement Performance Test Connections

OUTPUT

100 V MA X

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

7526A

7526A

HI

LO

4

W RTD/

INPUT

HI

LO

PRECISION PROCESS CALIBRAT

RTD/

mA

100 mA MAX

OUTPUT

HI

LO

SENSE

gxm016.eps

21

7526A

Calibration Manual

Pressure Modules

The Fluke 700 and 525A-P series pressure modules are calibrated separately from the
Product. Only a performance test is necessary. Connect any of the Fluke 700 and 525A-P
series pressure modules to the pressure module connector. Make sure that the Product
reads pressure. See Figure 9 for connections.

7526A

Pressure Module

PRECISION PROCESS CALIBRATOR

OUTPUT

100V MAX

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

7526A

HI

4

HI

LO

W RTD/

INPUT

HI

LO

mA

100mA MAX

LO

SENSE

RTD/

OUTPUT

HI

INPUT/OUTPUT

MAX TORQUE, SEE MANUAL

700PD6

LH

PRESSURE MODULE

RANGE

-15/+100 PSIG

-1/+7 bar

BURST PRESSURE 300 PSIG

TC

20V PK

MAX

Figure 9. Pressure Module Performance Test Connections

gxm017.eps

22

Precision Process Calibrator

20 V PK

MAX

HI

INPUT

LO

Press for

VOLTS/mA

Press and Hold

for Switch Test

Switch Test

Reset

LOOP

HART

PWR

VOLTS/mA

SW TEST

Performance Tests

Isolated DC Voltage

The isolated dc voltage performance test verifies the accuracy of the isolated dc voltage
source output from the front panel of the Product. Connect the 5522A Normal HI and LO
to the Product Isolated input HI and LO jacks located on the right side of the Product.
Verify the measurements listed in Table 9. See Figure 10 for connections.

Table 9. Isolated DC Voltage

Range Nominal Value Measured Value Deviation % Specification

0 V 0.0002 V

10.0 V

100.0 V

2.500 V 0.0003 V

5.000 V 0.0005 V

10.000 V 0.0007 V

0 V 0.002 V

25 V 0.003 V

50 V 0.005 V

75 V 0.006 V

100 V 0.007 V

7526ACalibrator

CALIBRATOR

5522A

gxm018.eps

Figure 10. Isolated DC Voltage Performance Test Connections

23

7526A

20 V PK

MAX

HI

INPUT

LO

Press for

VOLTS/mA

Press and Hold

for Switch Test

Switch Test

Reset

LOOP

HART

PWR

VOLTS/mA

SW TEST

Calibration Manual

Isolated DC Current

0.000 mA 0.0010 mA

25.000 mA 0.0035 mA

50.000 mA 0.0060 mA

The isolated dc current performance test verifies the accuracy of the isolated dc current
source output from the front panel of the Product. Connect 5522A Normal HI to the
Product Isolated Input LO. Connect the Product Isolated input HI to 8508A input A.
Connect 8508A Input LO to 5522A Normal LO. Use the 8508A to measure the 5522A
output as shown in Figure 2. Take the dc current indication from the 8508A as the
applied current. Verify the measurements listed in Table 10. See Figure 11 for
connections.

Table 10. Isolated DC Current

50 mA Input 8508A Reading Specification

7526A

Calibrator

5522A

Figure 11. Isolated DC Current Performance Test Connections

Isolated Loop Power

1. Connect a 1 kΩ, 1%, 1 W resistor across Isolated Input HI and LO.

CALIBRATOR

8508A

gxm019.eps

24

2. Set Isolated input to mA.

3. Push L. The upper ISO display shows 24 mA LPWR. The indication on the ISO

lower display must be between 26.300 mA to 21.500 mA to pass.

4. Push . The indication must be between 21.336 mA to 17.104 mA to pass.

The verification procedure is complete. If any steps did not pass, adjustment or repair is
necessary.

Precision Process Calibrator

Calibration Adjustment

Calibration Adjustment

The Product features electronic calibration adjustment. There are no mechanical
adjustments. Calibration adjustment is done with the case closed through the serial
communications port that sends and receives commands and readings with a RS232
interface.

The adjustment procedure for resistance measure is flexible to allow for the use of fixed
resistors. See Table 3 for the required equipment.

Initiate Communication

Terminal communications can be set up with terminal communication software on a
personal computer (PC). Connect a 9-pin null modem cable to the RS232 connector on
the back of the Product. Connect the other end of the cable to the PC/PC serial port. An
adapter may be necessary for terminals that use 25 pin “D” serial connectors. A terminal
program, such as Windows HyperTerminal, can be used in the PC. The terminal settings
must be set as follows:

• Bits per second: 9600

• Data bits: 8

• Parity: None

• Stop bits: 1

• Flow control: None

• Local echo: on

Starting Adjustment Mode

The Product temperature must be stable before calibration adjustments are done. Make
sure the Product has warmed up for a minimum of 30 minutes. To start the calibration
mode, use the PC terminal program to send the CAL_START command.

The PC shows:

Calibration is password protected

Enter Password:

Correctly enter the password with the PC keyboard. The password is 525.

25

7526A

Calibration Manual

The PC shows the calibration adjustment steps:

Calibration Menu

1: 100 mV Source

2: 1 V Source

3: 10 V Source

4: 100 V Source

5: 100 mA Source

6: Hi Ohms Source

7: Low Ohms Source

8: Hi Ohms Measure

9: 1K Ohms Measure

10: Low Ohms Measure

11: 100 Ohms Measure

12: TC SOURCE

13: TC READ

14: TC CJC

15: mA Read

16: 10V Read

17: 100V Read

18: Exit

Enter Selection:

Adjustment Sequence

Calibration adjustment is a menu-driven process. Fluke Calibration recommends that
calibration be done in the order specified by the menu. However, each step is independent
and can be performed separately if necessary, with the exception of the TC function. The
TC calibration adjustment must be done in the order shown in the menu (steps 1-18). TC
read uses the internal source mode and it must be adjusted after TC source. Do not source
with an external instrument for TC read. Connect a DMM and adjust the output to the
necessary value with the PC keyboard.

Exit the calibration mode at any time by typing 18.

Steps 1 through 4: DC mV and DC V Source Adjustment

Voltage output adjustment is done for four distinct ranges. Each range can be adjusted
separately with menu selections 1 through 4. The adjustment of each range uses the same
procedure and is done in two parts. The first part sets the zero and span values. The
second part fine-adjusts the zero, span, and adjusts the linearity if necessary. See Table 3
for the test equipment used for this procedure.

Connect the Product volts HI and LO to the DMM input. Set the DMM to measure
dc volts. See Figure 12 for connections.

26

Precision Process Calibrator

O

Calibration Adjustment

7526A

8508A

PRECISION PROCESS CALIBRATOR

7526A

RTD/

mA

OUTPUT

HI

LO

SENSE

gxm020.eps

OUTPUT

100V MAX

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

4

W RTD/

INPUT

100mA MAX

HI

LO

HI

LO

Figure 12. DC Volts Source Performance Test Connections

Enter 2 on the PC to choose the 1 V source calibration.

The value for the first calibration point (approximately 0 V) will be sourced by the
Product. When the output is stable, type the value shown on the DMM. After the value is
entered, the value for the second calibration point (approximately 1 V) will be sourced by
Product. Type the new value to complete the 1 V source calibration.

Step 5: 100 mA Source - DC Current Source Adjustment

The dc current output adjustment uses similar calibration steps to the voltage source
calibration. The adjustment is done in two parts. The first part sets the zero and span
values. The second part fine adjusts the zero, span and the linearity if necessary. Table 3
for the test equipment used for this procedure. See Figure 13 for connections.

742A

8508A

Figure 13. High and Low Ohms Adjustment Connections

OUTPUT

100 V MA X

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

7526A

4

W RTD/

INPUT

HI

LO

HI

LO

7526A

PRECISION PROCESS CALIBRAT

RTD/

mA

100 mA MAX

OUTPUT

HI

LO

SENSE

gxm023.eps

The voltage is measured across a 10 Ω shunt resistor instead of measuring current
directly. Readings from the DMM must be converted to mA (multiplied by 100) before
they can be entered with the PC. Set the DMM to read DC Volts.

27

7526A

Calibration Manual

Steps 6 and 7: Hi Ohms Source and Low Ohms Source Adjustment

Enter 5 on the PC. The calibration procedure for current output is similar to voltage
output except there is only one range and the voltage is measured across a 10 Ω shunt
resistor instead of a direct current measurement. Readings from the DMM must be
converted to mA (multiplied by 100) before they can be entered on the PC.

When the 5 Ω - 4000 Ω output range (high ohms source) is calibrated, the Product
outputs two calibration points. After the output becomes stable, the values are entered at
the PC. See Table 3 for the test equipment used for this procedure. See Figure 14 for
connections.

7526A

8508A

PRECISION PROCESS CALIBRATOR

7526A

RTD/

mA

OUTPUT

HI

LO

SENSE

INPUT/OUTPUT

OUTPUT

100V MAX

20V PK

MAX

CURRENT

20V PK

MAX

VOLTS

4

W RTD/

INPUT

100mA MAX

HI

LO

HI

LO

Figure 14. Hi Ohms Source and Low Ohms Source Adjustment Connections

It is important that the sense leads be on the bottom of the stack on the Product ohms
source jacks.

1. Set the DMM to measure 4-wire ohms.

2. The calibration of the 5 Ω - 4000 Ω output range (high ohms source) is similar to the

voltage source calibration. The Product outputs two calibration points. After the
output becomes stable, enter the values on the PC.

TC

20V PK

MAX

gxm021.eps

28

It is recommended to lock the DMM in the proper range (first range greater than
4000 Ω). The maximum excitation current of the DMM is 1 mA.

3. Enter the ohms shown on the DMM at the PC. The Product sources the maximum

value.

4. Enter the ohms shown on the DMM at the PC. After the value has been entered for

the second calibration point you will return to the main calibration menu.
The calibration of the 5 Ω - 400 Ω output range (low ohms source) is similar. The

maximum excitation current of the DMM is 3 mA.

Precision Process Calibrator

O

0

1

2

45

7

8

/

+

OPR

STBY

5522A

CALIBRATOR

Calibration Adjustment

Steps 8 through 11: 100 Ohms Measure, Resistance Measure Adjustment

The ohms measure calibration adjustment allows the use of a medium-quality resistor
decade in conjunction with a good-quality DMM by using flexible calibration points.
This way, if resistance standards are not available, the resistor decade can be set to 1 K,
the actual value of the DMM value can be read (1002.45 Ω for example), and this value
can be entered when asked for 1000 Ω.

You can use a resistor decade box, adjustable in 25 Ω to 4000 Ω range, to cover all of the
values that are requested (maximum 5 % tolerance):

• 25 Ω

• 50 Ω

• 100 Ω

• 200 Ω

• 400 Ω

• 1000 Ω

• 2000 Ω

• 4000 Ω

The subsequent procedure uses the Fluke 5522 for ohms source to adjust the Product
reading. See Table 3 for the test equipment used for this procedure. See Figure 15 for
connections.

Calibrator

OUTPUT

100 V MA X

20V PK

CURRENT

20V PK

7526A

PRECISION PROCESS CALIBRAT

7526A

VOLTS

MAX

MAX

4

W RTD/

INPUT

LO

LO

HI

HI

mA

100 mA MAX

Figure 15. 100 Ohms Measure, Resistance Measurement Adjustment Connections

HI

LO

SENSE

RTD/

OUTPUT

gxm024.eps

29

7526A

Calibration Manual

Step 12: TC SOURCE, TC mV Source Adjustment

This adjustment procedure requests approximately:

• 1000 Ω

• 2000 Ω

• 4000 Ω

The actual value used must be entered.

1. For the 0 Ω connection, connect a short to the 4 terminals for 4W RTD/Ω.

2. For the 5522A connections, see Figure 15 for connections.

3. Follow the steps in the menu.

4. Use the 5522A to enter 4000 Ω (nominal) and enter the actual value calculated as

described above.

5. Repeat for all calibration points.

The adjustment of the TC Source output range is similar to the first part of the voltage
source calibration. Use the test leads and a DMM for this procedure.

Use a copper TC mini-plug cable with low thermal EMF jacks on the other end to
connect the Product to the DMM. Make sure the polarity is correct. Set the DMM to read
dc volts.

Enter 12 at the PC. The calibration of the TC source output range is similar to the first
part of the voltage source calibration. The Product outputs two calibration points, after
the output becomes stable, enter the values on the PC.

After the mV reading on the DMM is entered, you are prompted to enter the second
calibration point.

30

Precision Process Calibrator

Calibration Adjustment

Step 13: TC Read, TC mV Measure Adjustment

The adjustment of the TC source output range is similar to the first part of the voltage
source calibration. The Product outputs two adjustment points. After the output becomes
stable, the values can be entered at the PC. Use the test leads and a DMM for this
procedure.

Use a copper TC mini-plug cable with low thermal EMF jacks on the other end to
connect the Product to the DMM. Make sure the polarity is correct. Set the DMM to read
dc volts.

Enter 13 on the PC. The calibration of the TC read input range is based on the TC source.
Make sure that TC source is calibrated first.

The Product sources 5 calibration points:

• -10 mV

• 15 mV

• 40 mV

• 65 mV

• 75 mV

For each test point, push 8 and 2 on the PC to adjust the output if necessary. Use the
8508A indication to monitor this voltage. After the output is within 1 μV of the necessary
value, push ENTER on the PC to go to the next calibration point.

Step 14: TC Cold Junction Temperature (TC CJC) Adjustment

The Calibration of the thermocouple cold junction temperature (TC CJC) is a critical part
of the adjustment process. It is important that the thermocouple junction be completely
stable. Use the precision thermometer, E thermocouple probe, lag bath, and thermistor
probe for this procedure. See Figure 4 for connections.

The precision thermometer probe must already be in the lag bath along with the E
thermocouple probe. Plug the mini-plug on the E thermocouple probe into the TC jack on
the Product.

Enter 14 at the PC

. It is important that the thermocouple junction be completely stable.

After the TC junction is stable, enter the temperature from the temperature reference.

Push ENTER on the PC to return to the calibration menu.

Step 15: mA Read Adjustment

Connect 5522A mA source jacks to Product isolated jacks and add the 742A-1 resistance
standard in series. Use the sense jacks of the resistor to monitor the voltage drop on the
resistor with the 8508A DMM. See Table 3 for the test equipment used for this
procedure.

Connect 5522A mA source jacks to the Product isolated jacks and add the 742A-1
resistance standard in series. Use the sense jacks of the resistor standard to monitor the
voltage drop on the resistor with the 8508A DMM. See Table 3 for the test equipment
used for this procedure. See Figure 16 for connections.

31

7526A

20 V PK

MAX

HI

INPUT

LO

Press for

VOLTS/mA

Press and Hold
for Switch Test

Switch Test

Reset

LOOP

HART

PWR

VOLTS/mA

SW TEST

0

1

2

45

7

8

/

+

OPR

STBY

5522A

CALIBRATOR

Calibration Manual

7526A5522A

742A

Figure 16. mA Read Adjustment Connections

Enter 15 at the PC. Source five calibration points from the 5522A:

• 0 mA

• 13 mA

• 26 mA

• 39 mA

• 52mA

For each calibration point adjust the current for the maximum accuracy with the DMM
indication as feedback. Push ENTER on the PC when stable to go to the next calibration
point.

Step 16: 10 V Read Adjustment

Connect 5522A V source jacks to 7526A isolated jacks. Use the 8508A DMM to monitor
the voltage.

8508A

gxm026.eps

32

Enter 16 on the PC. Source three calibration points from the 5522A:

• 0 V

• 5 V

• 10 V

For each calibration point, adjust the voltage for the maximum accuracy. Use the DMM
indication as feedback. Push ENTER on the PC when stable to go to the next calibration
point. See Table 3 for the test equipment used for this procedure. See Figure 17 for the
connections.

Precision Process Calibrator

100 V PK

MAX

HI

INPUT

LO

Press for

VOLTS/mA

Press and Hold

for Switch Test

Switch Test

Reset

LOOP

HART

PWR

VOLTS/mA

SW TEST

Calibration Adjustment

7526A

Calibrator

CALIBRATOR

5522A

8508A

Figure 17. 10 V Read Adjustment Connections

Step 17: 100 V Read Adjustment

Use the test equipment shown in Table 3. Connect the 5522A V source jacks to the
Product isolated jacks. Use the 8508A DMM to monitor the voltage. See Figure 17 for
the connections.

Enter 17 on the PC. Source three calibration points from 5522A:

• 0 V

• 50 V

• 100 V

For each calibration point, adjust the voltage for the maximum accuracy. Use the DMM
indication as feedback. Push ENTER on the PC when stable to go to the next calibration
point.

Calibration is complete. Enter 18 at the PC to exit calibration mode.

gxm022.eps

33

7526A

Calibration Manual

User-Replaceable Parts

User-replaceable parts are listed in Table 11 and shown in Figure 18. To get parts and
accessories, see the “Contact Fluke Calibration” section.

Table 11. User-Replaceable Parts

Item

Number

Fluke Part Number Description Quantity

 4285232 7526A Chassis, Base and Top 1
 295105 Allen Head Screw 20
 3693680 Chassis Cap 2
 3468883 Chassis Handles with Grip 2
 4285267 7526A Front Panel Decal 1
 4285271 7526A Keypad 1
 886382 Red 5-Way Binding Post 6
 886379 Black 5-Way Binding Post 6
 868786 Plastic Feet 4
 152165 #6 X 3/8 in. Screw, PH 1
 1601078 Programming Door 1
 1645311 Fuse, (1/4A), Fuse for 120 VAC (nominal) 2
 1645327 Fuse, (1/8A), Fuse for 240 VAC (nominal) 2
 448092 Jack Screw RS232 Conn 1
 102889 Binding Head Thumbscrew 1

Not Shown 320093 Flathead Screw 10

Not Shown 859939 #8 Washer, Low Thermal 28

Not Shown 850334 8-32 Nut, Low Thermal 24

Not Shown 1640305 Nylock Nut 6-32 5

Not Shown 1618621 Line Cord, 3 COND 1

Not Shown 4181286 7526A Manual CD-Rom 1

Not Shown 4218030 7526A Getting Started 1

 To ensure safety, use exact replacement only.

34

Precision Process Calibrator

User-Replaceable Parts

1

32x

2

20x

5

7526A

PRECISION PROCESS CALIBRATOR

VOLTS

mA

1

00

RT

mA MAX

D

/

O

U

T
P

UT

HI

HI

OUTPUT

1
0

0
V MAX

LO

2

0

V
P

K

LO

2x

4

MAX

CURRENT

2

0
V PK
MAX

TC

OUTPUT

INPU

4

W RT

D/

INP

UT

HI

SENSE

LO

INPUT

T/
OUTPUT

20

V PK

MAX

ZERO

DISPLAY

C / FCJC

SET

RECALL

AUTOSET

RNG LOCK

LOCAL

EXP

Press and Hold
for Switch Test

Switch Test

Reset

HI

INPU

T

1

0

0
V MAX

LO

20

V

P
K

MAX

6

94x

6x

7

6x

8

2x

15

10

11

14

12 13

gxm027.eps

Figure 18. User-Replaceable Parts

35

7526A

Calibration Manual

Accessories

1622027 Fluke Y7526A Rack Mount Kit

946470 RS43, RS232 Null Modem Cable

7526A-CASE Carrying Case

1618621 120 V Line Cord (US Plug)

769422 240 V Line Cord (Schuko Plug)

658641 240 V Line Cord (Australian Plug)

769448 240 V Line Cord (Swiss Plug)

769455 240 V Line Cord (UK Plug)

Accessories for the product are shown in Table 12. To get parts and accessories, see the
“Contact Fluke Calibration” section.

Table 12. Accessories

Fluke Part Number Description

36