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

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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.

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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.

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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

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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]

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