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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
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
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.
Warning
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
• Carefull
• Use the Pro
supplied by the Product can be compromised.
• Use this Product indoors onl
• Examine the case before you use
cracks or missing plastic. Carefully look at the insulation
around the terminals.
• Use onl
the voltage and plug configuration in your country and rated
for the Product.
• Replace the mains pow
or if the insulation shows signs of wear.
• Make sure the ground conductor in the mains po
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.
ad all instructions.
y re
duct only as
y the mains power cord a
specified, or the protection
y.
er cord if
the Product. Look for
nd connector approved for
the insulation is damaged
Product.
r cord is
we
2
• 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
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 incorrectl
Do not use and disable the Product if it is damaged.
•
more than the rated voltage, between
y.
the
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]
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