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Fluke 7526A, Calibration Manual

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7526A 

Calibration Manual 

16 

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 

CURRENT

OUTPUT

HI

VOLTS

mA

RTD/

   OUTPUT

HI

LO

HI

LO

LO

TC

SENSE

INPUT/OUTPUT

4W RTD/

    INPUT

20 V PK 

MAX

100 V MAX

100 mA MAX

20 V PK 

MAX

20 V PK 

MAX

PRECISION PROCESS CALIBRATOR

7526A

Mineral Oil
Lag Bath

Dewar Flask
and Cap

HI

Precision

Thermometer

7526A

 

gxm012.eps 

Figure 4. CJC Performance Test Connections 

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. 

Summary of Contents for 7526A

Page 1: ... 2013 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies 7526A Precision Process Calibrator Calibration Manual ...

Page 2: ... 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 caus...

Page 3: ...s 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...

Page 4: ...7526A Calibration Manual ii Step 17 100 V Read Adjustment 33 User Replaceable Parts 34 Accessories 36 ...

Page 5: ...cement 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 ...

Page 6: ...7526A Calibration Manual iv ...

Page 7: ...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 Resistanc...

Page 8: ...7526A Calibration Manual vi ...

Page 9: ...esearch 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 31 40 2675 200 Japan 81 3 6714 3114 Singapore 65 6799 5566 China 86 400 810 3435 Brazil 55 11 3759 7600 A...

Page 10: ...e 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...

Page 11: ...sehold waste Product Category 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 Co...

Page 12: ...A 61010 1 CAN CSA 22 2 No 61010 1 EMC Complies with EN IEC 61326 1 EN IEC 61326 2 1 for controlled EM 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 ...

Page 13: ...of output µV Stability Resolution Maximum Burden 2 90 Days 1 Year 24 hours 1 C ppm of output μV 10 to 75 000 mV 25 2 μV 30 2 μV 5 ppm 2 μV 1 μV 10 Ω 1 All outputs are positive only unless otherwise noted 2 Remote sensing is not provided Output resistance is 1Ω DC Voltage Specifications Isolated Input Ranges Absolute Uncertainty tcal 5 C ppm of reading mV Resolution 0 V to 10 0000 V 50 0 2 100 μV 0...

Page 14: ... mA Thermocouple Specification Output and Input TC Type Range C Absolute Uncertainty tcal 5 C C 1 Output Input Minimum Maximum 90 days 1 Year B 600 C 800 C 1550 C 800 C 1550 C 1820 C 0 35 C 0 28 C 0 21 C 0 35 C 0 28 C 0 22 C C 0 C 1000 C 1800 C 2000 C 1000 C 1800 C 2000 C 2316 C 0 15 C 0 22 C 0 24 C 0 32 C 0 16 C 0 23 C 0 26 C 0 35 C E 250 C 200 C 100 C 0 C 600 C 200 C 100 C 0 C 600 C 1000 C 0 24 ...

Page 15: ... 0 29 C 0 23 C 0 22 C 0 22 C 0 26 C T 250 C 200 C 100 C 0 C 200 C 200 C 100 C 0 C 200 C 400 C 0 34 C 0 14 C 0 09 C 0 07 C 0 06 C 0 35 C 0 16 C 0 11 C 0 09 C 0 09 C U 200 C 0 C 200 C 0 C 200 C 600 C 0 15 C 0 08 C 0 07 C 0 16 C 0 10 C 0 10 C XK 200 C 100 C 0 C 600 C 100 C 0 C 600 C 800 C 0 10 C 0 07 C 0 06 C 0 07 C 0 11 C 0 09 C 0 08 C 0 09 C BP 0 C 200 C 600 C 800 C 1600 C 2000 C 200 C 600 C 800 C ...

Page 16: ...Ω 200 C 80 C 100 C 300 C 400 C 630 C 80 C 100 C 300 C 400 C 630 C 800 C 0 012 C 0 018 C 0 022 C 0 025 C 0 031 C 0 037 C 0 013 C 0 020 C 0 024 C 0 026 C 0 033 C 0 038 C Pt 3926 100 Ω 200 C 80 C 0 C 100 C 300 C 400 C 80 C 0 C 100 C 300 C 400 C 630 C 0 012 C 0 014 C 0 016 C 0 022 C 0 022 C 0 024 C 0 013 C 0 015 C 0 017 C 0 022 C 0 026 C 0 032 C Pt 3916 100 Ω 200 C 190 C 80 C 0 C 100 C 300 C 400 C 600...

Page 17: ...anel 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 ...

Page 18: ...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 ...

Page 19: ...ge 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 ...

Page 20: ...Ohms shorting block Low ohms measure and SPRT calibration and high ohms measure calibration 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 Low ohms measure and SPRT calibration 1 KΩ Resistance Standard Fluke 742A 1K Resistance 10 KΩ Resistance Standard Fluke 742A 10K Resistance Multifunction ...

Page 21: ...ange Nominal Value Measured Value 90 Day Specification V 1 Year Specification V 100 mV 0 V 3 00E 06 3 00E 06 0 035 V 3 88E 06 4 05E 06 0 065 V 4 63E 06 4 95E 06 0 1 V 5 50E 06 6 00E 06 1 0 V 0 V 1 00E 05 1 00E 05 0 35 V 1 88E 05 2 05E 05 0 65 V 2 63E 05 2 95E 05 1 V 3 50E 05 4 00E 05 10 0 V 0 V 1 00E 04 1 00E 04 3 5 V 1 88E 04 2 05E 04 6 5 V 2 63E 04 2 95E 04 10 V 3 50E 04 4 00E 04 100 0 V 0 V 1 0...

Page 22: ...nts 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 0 000 mA Direct into 8508A Current Input Autorange 1 0 μA 1 0 μA 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 CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO SENSE 4W RTD INPUT 20V PK MAX 100V ...

Page 23: ...hite 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...

Page 24: ...wn 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 CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO TC SENSE INPUT OUTPUT 4W RTD INPUT 20V PK MAX 100V MAX 100mA MAX 20V PK MAX 20V PK MAX PRECISION PROCESS CALIBRATOR 7526A Mineral Oil Lag Bath Dewar Flask...

Page 25: ...ons 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 CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO TC SENSE INPUT OUTPUT 4W RTD INPUT 20V PK MAX 100V MAX 100mA MAX 20V PK MAX 20V PK MAX PRECISION PROCESS CALIBRATOR 7526A 5522A CALIBRATOR HI 7526A Calibrator gxm013 eps Figure 5 TC Input Performanc...

Page 26: ...hould be set to the 20 kΩ range with loI off To prevent an overload the 8508A must be in the loI low current mode to measure 5 Ω in the 4 kΩ range CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO TC SENSE INPUT OUTPUT 4W RTD INPUT 20V PK MAX 100V MAX 100mA MAX 20V PK MAX 20V PK MAX PRECISION PROCESS CALIBRATOR 7526A HI 8508A 7526A gxm014 eps Figure 6 Resistance Output Performance Test Connecti...

Page 27: ...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 TRIG 5V PK MAX REAR INPUT CURRENT FUSE F 1 6AH 5x20mm IEC127 INPUT 2 WIRE HI LO GU 3A PK MAX 920V PK MAX 1420V PK MAX LO HI CALIBRATION SENSE 4 WIRE E...

Page 28: ...fter the 400 Ω test change the 7526A to the 4000 Ω range Table 8 Ohms Ratio Table Range 742A Value Ω Ratio 5522A Actual Value Ω 7526A Reading 90 Day Specification 1 Year Specification 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...

Page 29: ...e 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 CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO SENSE 4W RTD INPUT 20V PK MAX 100V MAX ...

Page 30: ...e module connector Make sure that the Product reads pressure See Figure 9 for connections CURRENT OUTPUT HI VOLTS mA RTD OUTPUT HI LO HI LO LO TC SENSE INPUT OUTPUT 4W RTD INPUT 20V PK MAX 100V MAX 100mA MAX 20V PK MAX 20V PK MAX PRECISION PROCESS CALIBRATOR 7526A HI RANGE 15 100 PSIG BURST PRESSURE 300 PSIG MAX TORQUE SEE MANUAL L H PRESSURE MODULE 700PD6 1 7 bar 7526A Pressure Module gxm017 eps ...

Page 31: ...ct Verify the measurements listed in Table 9 See Figure 10 for connections Table 9 Isolated DC Voltage Range Nominal Value Measured Value Deviation Specification 10 0 V 0 V 0 0002 V 2 500 V 0 0003 V 5 000 V 0 0005 V 10 000 V 0 0007 V 100 0 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 20 V PK MAX HI INPUT LO Press for VOLTS mA Press and Hold for SwitchTest SwitchTest Reset LOO...

Page 32: ...lated DC Current 50 mA Input 8508A Reading Specification 0 000 mA 0 0010 mA 25 000 mA 0 0035 mA 50 000 mA 0 0060 mA 5522A CALIBRATOR 20 V PK MAX HI INPUT LO Press for VOLTS mA Press and Hold for SwitchTest SwitchTest Reset LOOP HART PWR VOLTS mA SW TEST 7526A Calibrator 8508A gxm019 eps Figure 11 Isolated DC Current Performance Test Connections Isolated Loop Power 1 Connect a 1 kΩ 1 1 W resistor a...

Page 33: ...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 Non...

Page 34: ...ust 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 don...

Page 35: ...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 ...

Page 36: ...V PK MAX 20V PK MAX PRECISION PROCESS CALIBRATOR 7526A 7526A 8508A gxm021 eps 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 Pr...

Page 37: ...d 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 CURRENT OUTP...

Page 38: ...justment 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 ran...

Page 39: ...d 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 ...

Page 40: ...nt 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 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 acc...

Page 41: ...nt 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 ...

Page 42: ...85271 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 S...

Page 43: ...PUT 20V PK MAX 100V MAX 100mA MAX 20V PK MAX 20V PK MAX SET RECALL LOCAL EXP AUTOSET INPUT OUTPUT ZERO RNG LOCK C F CJC DISPLAY HI LO PressandHold forSwitchTest SwitchTest Reset INPUT 20V PK MAX 100V MAX PRECISION PROCESS CALIBRATOR 7526A 2 3 2x 4 5 6 11 12 13 10 15 7 8 2x 9 4x 2x 6x 6x 20x 1 14 gxm027 eps Figure 18 User Replaceable Parts ...

Page 44: ...ke Calibration section Table 12 Accessories Fluke Part Number Description 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 ...

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