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Fluke 525B User Manual

Temperature/pressure calibrator
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525B
Temperature/Pressure Calibrator
Users Manual
July 2012
© 2012 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 525B

  • Page 1 525B Temperature/Pressure Calibrator Users Manual July 2012 © 2012 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies.
  • Page 2 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.

  • Page 3: Table Of Contents

    Chapter Title Page Getting Started ................... 1-1 Introduction ...................... 1-1 Contacting Fluke ....................1-1 Standard Equipment ..................1-2 Options and Accessories .................. 1-2 Safety Information ................... 1-2 Getting Acquainted with the Calibrator ............1-5 Input and Output Terminals ..............1-5 Using the Keys ..................
  • Page 4 Extra Space or Tab Characters ............. 4-19 Terminators ..................4-19 Incoming Character Processing ............4-20 Response Message Syntax ..............4-20 Checking 525B Status ..................4-21 Serial Poll Status Byte (STB) ..............4-23 Service Request (SRQ) Line ..............4-23 Service Request Enable Register (SRE) ..........4-24...
  • Page 5 Contents (continued) Programming the STB and SRE ............4-24 Event Status Register (ESR) ..............4-24 Event Status Enable (ESE) Register ............. 4-24 Bit Assignments for the ESR and ESE ..........4-25 Programming the ESR and ESE ............4-26 Output Queue .................... 4-26 Error Queue ....................
  • Page 6 525B Users Manual DC Current Specifications, Output ............7-2 Resistance Specifications, Output ............. 7-3 Resistance Specifications, Input ............... 7-3 Thermocouple Specification, Output and Input ........7-4 RTD and Thermistor Specification, Output ..........7-5 RTD and Thermistor Specification, Input ..........7-6...
  • Page 7 Measuring DC Current..................6-6 6-5. TC Temperatures ..................... 6-7 6-6. Ohms Output Ranges ..................6-10 6-6. Ohms Ratio Table .................... 6-12 6-8. Replacement Parts ................... 6-16 6-9. Fluke 700 SeriesPressure Modules ..............6-17 6-10. Fluke 525A-P Series Pressure Modules ............6-18...
  • Page 8 525B Users Manual...
  • Page 9 Connections for CJC Calibration ..............6-8 6-5. Connections for Measuring TC Input .............. 6-9 6-6. Connection for Measuring Resistance Output ..........6-10 6-7. 8508A/01 Connection Diagram ............... 6-11 6-8. Connection for Measuring Ohms ..............6-13 6-9. Exploded View of the 525B ................6-15...
  • Page 10 525B Users Manual viii...

  • Page 11: Getting Started

    • 5-way binding posts • IEEE 488.2 parallel interface • RS-232 serial interface Contacting Fluke To order accessories or get the location of the nearest Fluke distributor or Service Center, call: • USA: 1-888-99-FLUKE (1-888-993-5853) • Canada: 1-800-36-FLUKE (1-800-363-5853) •...

  • Page 12: Standard Equipment

    Chapter 6. • 525B Getting Started Guide, Part No. 3064079 • 525B CD-ROM (contains the 525B Users Manual and 525B Getting Started Guide), Part No. 3064087 • Power Cord (120 V cord, Part No.1618621 or 240 V cord, Part No. 769422) •...
  • Page 13 Getting Started Safety Information A Warning statement identifies hazardous conditions and actions that could cause bodily harm or death. A Caution statement identifies conditions and actions that could damage the Calibrator or the equipment under test. International symbols used on the Calibrator and in this manual are explained in Table 1-2.
  • Page 14 525B Users Manual Table 1-2. Symbols Used on the Calibrator   Earth ground AC (Alternating Current)   Resistance DC (Direct Current)   Conforms to European Union Pressure directives   Canadian Standards Association, Chassis protective ground ...

  • Page 15: Getting Acquainted With The Calibrator

    Getting Started Getting Acquainted with the Calibrator Getting Acquainted with the Calibrator Input and Output Terminals Figure 1-1 shows the Calibrator input and output terminals and explains their use. VOLTS 100mA MAX VOLTS TYPE OUTPUT STBY 100V MAX UNITS INPUT/OUTPUT 20V PK OUTPUT INPUT...

  • Page 16: Using The Keys

    525B Users Manual Using the Keys Figure 1-2 shows the Calibrator pushbuttons and Table 1-3 explains their use. Other function keys are shown in Figure 1-3 and described in Table 1-4. VOLTS TYPE STBY UNITS OUTPUT INPUT ZERO SHIFT SETUP...
  • Page 17 Getting Started Getting Acquainted with the Calibrator Table 1-3. Pushbutton Usage Name Description Cycles the Calibrator through Standby and Operate   modes.   Toggles between DC voltage and DC current modes. Toggles between the current thermocouple and current ...
  • Page 18 525B Users Manual STBY VOLTS TYPE UNITS OUTPUT INPUT ZERO SHIFT SETUP C / F RECALL AUTOSET LOCAL RNG LOCK • ENTER fcn11f.eps Figure 1-3. Calibrator Function Keys Table 1-4. Function Keys Name Description  RNG LOCK Activates/deactivates the autorange feature of the Calibrator in ...
  • Page 19 Getting Started Getting Acquainted with the Calibrator Table 1-4. Function Keys (cont) Name Description  SETUP Press  to advance through the LCD Backlight, Interface, and  Address menus. • Use  and  to adjust LCD backlight when the LCD menu is displayed.

  • Page 20: Display Error Messages

    525B Users Manual Table 1-4. Function Keys (cont) Name Description  RECALL Used to recall a programmed set point.  Press  . RECALL SPT # appears on the display. Enter the number of the output setpoint that you want to use. The output will then be programmed to the setpoint you entered.

  • Page 21: Rear Panel View

     Service port used to download new firmware to the Calibrator.  The IEEE-488 connector is a standard parallel interface for operating the 525B in remote control as a talker/listener on the IEEE-488 bus.  The RS-232 connector is used for serial remote control of the 525B.
  • Page 22 525B Users Manual 1-12...

  • Page 23: Using Output Mode

    When adjusting an output using the   keys, the Calibrator will not display or let you enter an out-of-range value. Note The figures is this chapter show how to connect to a Fluke 725 Multifunction Process Calibrator. For other instruments, refer to the users manual for connection instructions.

  • Page 24: Simulating Thermocouple Temperature

    525B Users Manual Simulating Thermocouple Temperature Connect the Calibrator TC input/output to the unit under test (UUT) with thermocouple wire and the appropriate thermocouple mini-connector. Supported TC types are listed in Chapter 7. Figure 2-1 shows this connection. To simulate temperature using a thermocouple (TC): 1.

  • Page 25: Simulating Temperature Using Resistance Temperature Detectors (Rtds)

    Using Output Mode Using Output Mode Simulating Temperature Using Resistance Temperature Detectors (RTDs) RTDs have a characteristic resistance at specific temperatures. The simulated output, then, is a resistance value based on the selected temperature and type of RTD being simulated. To simulate temperature using a resistance temperature detector: 1.

  • Page 26: Simulating Custom Rtd Coefficients

    525B Users Manual Simulating Custom RTD Coefficients The USR_DEF RTD type allows the Calibrator to simulate a custom curve-fit RTD. To enter the coefficients for a custom RTD: 1. Press  to select RTD mode. 2. Press  until you get the display.

  • Page 27: Default Rtd Coefficients

    Using Output Mode Using Output Mode Default RTD Coefficients The USR_DEF function of the calibrator uses the Calendar-Van Dusen equation for outputting and measuring custom RTDs. The C coefficient is only used for the subrange –260 to 0 degrees Celsius. Only the A and B coefficients are needed for the subrange 0 to 630 degrees.

  • Page 28: Entering Custom Standard Platinum Resistance Thermometer (Sprt) Coefficients

    525B Users Manual Entering Custom Standard Platinum Resistance Thermometer (SPRT) Coefficients To enter coefficients for a custom SPRT: 1. Press  to enter RTD mode. 2. Press  until you get the display and press . RTD SPRT and press .

  • Page 29: Output Dc Voltage

    Using Output Mode Using Output Mode Output DC Voltage The Calibrator is a fully programmable precision source of DC voltage from 0 V to 100 V. The Calibrator can only output positive (+) values. To output DC voltage: 1. Connect the Calibrator to the UUT as shown in Figure 2-3. 2.

  • Page 30: Output Resistance

    525B Users Manual Output Resistance To output resistance: 1. Connect the Calibrator to the UUT as shown in Figure 2-4. 2. Press  until RTD mode is selected. 3. If necessary, press   for RTD OUT mode. 4. Press  to select the appropriate ohms output range (400 or 4000 ohms).

  • Page 31: Output Current

    Using Output Mode Output Current Output Current The Calibrator is a fully programmable precision source of DC current from 0 mA to 100 mA. The Calibrator can only output positive (+) values. To output current: 1. Connect the Calibrator to the UUT as shown in Figure 2-5. 2.
  • Page 32 525B Users Manual 2-10...

  • Page 33: Using Input Mode

    Fluke 700 and 525A-P series pressure modules. Note The figures in this chapter show how to connect to a Fluke 725 Multifunction Process Calibrator. For other instruments, refer to their users manual for connection instructions.

  • Page 34: Measuring Temperature Using Thermocouples

    525B Users Manual MULTIFUNCTION CALIBRATOR VOLTS 100mA MAX V mA ZERO LOOP OUTPUT STBY VOLTS TYPE V mA 100V MAX UNITS MEAS SOURCE ° ° INPUT/OUTPUT 20V PK OUTPUT INPUT ZERO STORE SHIFT 100% SETUP 4W RTD SETUP C / F...
  • Page 35 Using Input Mode Using Input Mode To measure temperature using a thermocouple: 1. Attach the thermocouple leads to the TC input/output connector as shown in Figure 3-2. One pin is wider than the other. Do not attempt to force the plug in the wrong polarization.

  • Page 36: Thermocouple Zero Calibration

    525B Users Manual Thermocouple Zero Calibration To obtain the optimum measurement accuracy, you must perform a zero calibration when operating the Calibrator outside of the ambient temperature range of 18 ºC to 28 ºC. The zero calibration must be performed with the Calibrator thermally stable at the ambient temperature of operation.

  • Page 37: Measuring Temperature Using Resistance Temperature Detectors (Rtds)

    Using Input Mode Using Input Mode Measuring Temperature Using Resistance Temperature Detectors (RTDs) You must use a 4-wire connection to achieve the Calibrator accuracy specifications. To measure the RTD output from an instrument: 1. Connect the Calibrator to the instrument you want to measure as shown in Figure 3-3.
  • Page 38 525B Users Manual 4. Press  to select the desired RTD type. You can toggle between ºC and ºF temperature units by pressing  . VOLTS 100mA MAX VOLTS TYPE OUTPUT STBY 100V MAX UNITS INPUT/OUTPUT 20V PK OUTPUT INPUT...

  • Page 39: Entering And Using Custom Rtds

    Using Input Mode Using Input Mode Entering and Using Custom RTDs The USR_DEF RTD type allows the Calibrator to simulate a custom curve-fit RTD. To enter the coefficients for custom RTDs: 1. Press  to select RTD mode. 2. Press  until you get the display.

  • Page 40: Default Rtd Coefficients

    525B Users Manual Default RTD Coefficients The USR_DEF function of the calibrator uses the Calendar-Van Dusen equation for outputting and measuring custom RTDs. The C coefficient is only used for the subrange –260 to 0 degrees Celsius. Only the A and B coefficients are needed for the subrange 0 to 630 degrees.

  • Page 41: Entering Custom Sprt Coefficients

    Using Input Mode Using Input Mode Entering Custom SPRT Coefficients To enter coefficients for a custom SPRT: 1. Press  to enter RTD mode. 2. If necessary, press   for RTD IN mode. 3. Press  until you get the display and press .

  • Page 42: Measuring Pressure

    Users Manual Measuring Pressure Many ranges and types of pressure modules are available from Fluke. See “Accessories” in Chapter 6 of this manual for a complete list of supported pressure modules. Before you use a pressure module, read its instruction sheet. Pressure modules vary in use, media, and accuracy.

  • Page 43: Remote Operation

    (PC) equipped with one or more IEEE- 488 ports. You can write your own computer programs for system operation using the command set, or you can purchase optional Fluke calibration software MET/CAL. Typical IEEE-488 configurations are shown in Figure 4-3. The configuration showing the PC with two IEEE-488 ports is used with MET/CAL, which prefers UUTs on a separate IEEE-488 port.

  • Page 44: Setting Up The Rs-232 Port For Remote Control

    -based language such as Visual Basic, or run optional ® Windows -based Fluke software such as MET/CAL. The RS-232 cable length for the port should not exceed 15 meters (50 feet), although longer cable lengths are permitted if the load capacitance measured at a connection point (including signal terminator) does not exceed 2500 pF.
  • Page 45 1. Select Start->Programs->Accessories->Hyperterminal->Hyper Terminal. 2. Enter 525B for Name:, and select OK. 3. Select PC serial port which 525B is connected to (from drop-down list), for Connect using: and select OK 4. Select the following setting and then select OK:...
  • Page 46 525B Users Manual SERIAL FROM HOST COM Port Port 525B Calibrator Controller System for a UUT without a remote port. SERIAL FROM HOST RS-232 COM Port COM Port Port Port 525B Calibrator Controller System for a UUT with an RS-232 port (via PC).

  • Page 47: Rs-232 Interface Overview

    Figure 4-3 shows typical IEEE-488 remote control connections. A PC equipped with an IEEE-488 interface controls the Calibrator. Compatible software for IEEE-488 operation, MET/CAL, may be purchased from Fluke. When using the IEEE-488 remote control interface, there are two restrictions: 1.
  • Page 48 525B Users Manual IEEE-488 Port IEEE-488 Port 525B Calibrator Controller System for a UUT without a remote port. 525B Calibrator Controller System for a UUT with an IEEE-488 remote port. RS-232 COM Port Port 525B Calibrator Controller System for a UUT with an RS-232 remote port.

  • Page 49: Ieee-488 Port Setup Procedure

    Figure 4-4. Testing the IEEE-488 Port It is beyond the scope of this manual to describe how to test the 525B IEEE-488 interface in general because Windows is not provided by default with an application to exercise a device attached to an IEEE-488 interface card. However if MET/CAL has been purchased, the following steps may be performed to verify that the 525B IEEE-488 interface is functioning properly.

  • Page 50: Changing Between Remote And Local Operation

    You can only enter the Local with Lockout State by sending the IEEE- 488 GTL (Go to Local) message when the 525B is in remote with lockout. Remote State When the Calibrator is placed in remote, either via RS-232 REMOTE command, or via IEEE-488 asserting the REN line, it enters the remote state.

  • Page 51: Remote With Lockout State

    Remote with Lockout State When the Calibrator is placed in lockout, either via RS-232 LOCKOUT command, or via the IEEE-488 message LLO, the 525B front panel controls are totally locked out. The top line of the display changes to: REM.

  • Page 52: Ieee-488 Interface Overview

    525B Users Manual IEEE-488 Interface Overview The IEEE-488 parallel interface sends commands as data and receives measurements and messages as data. The maximum data exchange rate is 1 Mbyte, with a maximum distance of 20 meters for the sum length of the connecting cables.
  • Page 53 Remote Operation IEEE-488 Interface Overview Type M - Multiline U - Uniline Class AC - Addressed Command DD - Device Dependent AD - Address (Talk or listen) HS - Handshake UC - Universal Command SE - Secondary ST - Status Other B1, B2, etc.
  • Page 54 525B Users Manual Table 4-4 IEEE-488 Remote Message Coding (continued) MESSAGE DATA HAND- DESCRIPTION SHAKE MANAGEMENT MESSAGE NAME Parallel Poll Configure M AC Parallel Poll Enable M SE B4 B3 B2 B1 Parallel Poll Disable M SE B4 B3 B2 B1...

  • Page 55: Using Commands

    Remote Operation Using Commands Using Commands Communications between the controller and the Calibrator consists of commands, queries, and interface messages. Although the commands are based on the 488.2 standard, they can be used on either the IEEE-488 or RS-232 interface, except for a few specialized RS-232 commands described in “Commands for RS-232 Only.”...

  • Page 56: Query Commands

    525B Users Manual Query Commands Query commands request information, which is returned as the command executes, or placed in a buffer until requested. An example of a query, which always ends with a question mark, is, RANGE? returning the Calibrator dc voltage output range.
  • Page 57 Trigger a TC measurement and put the reading in the output buffer. Trigger Go To Local Transfer control of the 525B from one of the remote states to one of the local states. (See Table 4-2) Local Lockout Transfers remote/local control of the 525B. (See Table 4-2) Interface Clear A control line that sets the interface to a quiescent state.

  • Page 58: Compound Commands

    Refer to “Checking 525B Status” for details. Status Byte The status byte is what the 525B sends when it responds to a serial poll (interface message SPE). Compound Commands A compound command is two or more commands in a single command line. For...

  • Page 59: Sequential Commands

    For example, OUT 1 V ; *WAI You can also use the status commands *OPC and *OPC? to detect completion of overlapped commands. (See “Checking 525B Status.”) Sequential Commands Commands that execute immediately are called sequential commands.

  • Page 60: Command Syntax

    525B Users Manual Command Syntax The following syntax rules apply to all the remote commands. Information about syntax of response messages is also given. Parameter Syntax Rules Table 4-8 lists the units accepted in command parameters and used in responses.

  • Page 61: Extra Space Or Tab Characters

    Remote Operation Using Commands General Rules The general rules for parameter usage is as follows: 1. Numeric parameters may have up 15 significant digits and their exponents can be in the range ± -1.0E ± -20. 2. Including too many or too few parameters causes a command error. 3.

  • Page 62: Incoming Character Processing

    525B Users Manual IEEE-488 Interface The Calibrator sends the ASCII character Carriage Return with the EOI control line held high as the terminator for response messages. The calibrator recognizes the following as terminators when encountered in incoming data: • ASCII CR character •...

  • Page 63: Checking 525B Status

    Remote Operation Checking 525B Status Table 4-10. Response Data Types Data Type Description Integer Integers for some controllers or computers are decimal numbers in the range -32768 to 32768. Responses in this range are labeled Integer. Example: *ESE 123; *ESE?
  • Page 64 525B Users Manual Each status register and queue has a summary bit in the Serial Poll Status Byte. Enable registers are used to mask various bits in the status registers and generate summary bits in the Serial Poll Status Byte. For IEEE-488 interface operation, the Service Request Enable Register is used to assert the SRQ control line on detection of any status condition or conditions the programmer chooses.

  • Page 65: Serial Poll Status Byte (Stb)

    Set to 1 when one or more ESR bits are 1. Message available. The MAV bit is set to 1 whenever data is available in the 525B’s IEEE-488 interface output buffer.

  • Page 66: Service Request Enable Register (Sre)

    525B Users Manual Service Request Enable Register (SRE) The Service Request Enable Register (SRE) enables or masks the bits of the Serial Poll Status Byte. The SRE is cleared at power up. Refer to Figure 4-6 for the bit functions.

  • Page 67: Bit Assignments For The Esr And Ese

    Device-dependent error. An error related to a device-dependent command has occurred. Query error. The 525B was addressed to talk when no response data was available or appropriate, or when the controller failed to retrieve data on the output queue. Operation complete. All commands previous to reception of a *OPC c ommand have been executed, and the interface is ready to accept another message.

  • Page 68: Programming The Esr And Ese

    525B Users Manual Programming the ESR and ESE To read the contents of the ESR, send the remote command, *ESR?. The ESR is cleared (set to 0) every time it is read. To read the contents of the ESE, send the remote command, *ESE?.
  • Page 69 Remote Operation Checking 525B Status IEEE-488 The Calibrator treats the EOI IEEE-488 control line as a separate data byte and inserts it into the input buffer if it is encountered as part of a message terminator. Input buffer operation is transparent to the program running on the controller.
  • Page 70 525B Users Manual 4-28...

  • Page 71: Remote Commands

    Chapter 5 Remote Commands Introduction Remote commands duplicate activities that can be initiated from the front panel in local operation. Following the summary table is a complete alphabetical listing of all commands complete with protocol details. Separate headings in the alphabetical listing provide the parameters and responses, plus an example for each command.

  • Page 72: External Connection Commands

    525B Users Manual Common Commands (continued) Command Description *OPT? Returns a list of the installed hardware and software options. *RST Resets the state of the instrument to the power-up state. This command holds off execution of subsequent commands until it is complete.

  • Page 73: Output Commands

    Remote Commands Command Summary by Function Output Commands Command Description FUNC? Returns the present output, measurement, or calibration function. OPER Activates the Calibrator output if it is in standby. OPER? Returns the operate/standby setting. Sets the output of the Calibrator. OUT? Returns the output amplitude of the Calibrator.

  • Page 74: Status Commands

    Number Class Description Error queue overflow. OPER or STBY was received when the 525B is in Measure mode or TC Source mode. A non-numeric entry was received in a field that should contain a numeric entry. The numeric field exceeds 10 characters.

  • Page 75: Remote Command Listing

    The command string buffer overflowed. The serial output buffer overflowed. The output overloaded. 525B is out of tolerance. This error is set after a failed initialization or a failed *TST?. 525B has a ADC failure. This error is set after a failed initialization or a failed *TST?.
  • Page 76 525B Users Manual IEEE-488 RS-232 Sequential Overlapped *CLS (Clear Status command) Clears the ESR, the error queue, and the RQS bit in the status byte. This command terminates pending operation complete commands (*OPC or *OPC?). Parameter: (None) Example: *CLS Clear the ESR, the error queue, and the RQS bit in the status byte.
  • Page 77 Remote Commands Remote Command Listing *ESR? IEEE-488 RS-232 Sequential Overlapped (Event Status Register query) Returns the contents of the Event Status Register (ESR) and clears the register. (See Event Status Register (ESR)” in Chapter 4.) Response: <value> (decimal equivalent of the ESR byte, 0 to 255) Example: *ESR? returns 189 Returns decimal 189 (binary 00111101) when bits 5 (CME), 4 (EXE), 3 (DDE),...
  • Page 78 2. Model number 3. Serial number (always 0) 4. Firmware revision levels for the main, front panel, and inguard CPUs. Example: *IDN? returns FLUKE,525B,0,1.2 Returns Fluke manufacturer, model 525B, serial number 0, firmware version 1.2. LOCAL IEEE-488 RS-232 Sequential Overlapped...
  • Page 79 Remote Commands Remote Command Listing Set bit 0 of the Event Status Register to 1 when all pending device operations are done. *OPC? IEEE-488 RS-232 Sequential Overlapped (Operations Complete query) Returns a 1 after all pending operations are complete. This command causes program execution to pause until operations are complete.
  • Page 80 525B Users Manual IEEE-488 RS-232 Sequential Overlapped (Output command) Sets the output of the Calibrator and establishes a new reference point for the error mode. To source or measure a temperature, select the desired sensor and sensor parameters first. (See the TSENS_TYPE, RTD_TYPE, and TC_TYPE commands.)
  • Page 81 (Indefinite ASCII) A message containing four fields separated by commas as follows: 1. Manufacturer 2. Model number 3. Serial number 4. Firmware revision (0) Example: FLUKE,700P05,9467502,0 PRES_MEAS IEEE-488 RS-232 Sequential Overlapped (Pressure Measurement mode command) Changes the operating mode to pressure measurement.
  • Page 82 525B Users Manual PRES_UNIT? IEEE-488 RS-232 Sequential Overlapped (Pressure Units query) Returns the pressure display units. Responses: (pounds per square inch) (inches of water at 4 degrees Celsius) INH2O4C (inches of water at 20 degrees Celsius) INH2O20C (centimeters of water at 4 degrees Celsius)
  • Page 83 Remote Commands Remote Command Listing IEEE-488 RS-232 Sequential Overlapped RANGELCK? (Range command) Returns the RANGELOCK state 1 for ON or 0 for OFF. Parameter: (None) IEEE-488 RS-232 Sequential Overlapped REMOTE (Remote command) Places the Calibrator into the remote state. This command duplicates the IEEE-488 REN (Remote Enable) message.
  • Page 84 525B Users Manual RTD_MEAS IEEE-488 RS-232 Sequential Overlapped (RTD Measure command) Selects the measure RTD mode. Parameters: CEL (Celsius) (optional) (Fahrenheit) (optional) Example: RTD_MEAS CEL Measure the RTD temperature that is attached to the Calibrator RTD terminals, in Celsius. RTD_TYPE...
  • Page 85 Remote Commands Remote Command Listing RTD_TYPE? IEEE-488 RS-232 Sequential Overlapped (Resistance Temperature Detector Type query) Returns the Resistance Temperature Detector (RTD) type used for RTD temperature simulations. (100-ohm RTD, curve α=0.00385 ohms/ohm/°C) Responses: PT385_100 (200-ohm RTD, curve α=0.00385 ohms/ohm/°C) PT385_200 (500-ohm RTD, curve α=0.00385 ohms/ohm/°C) PT385_500 PT385_1000 (1000-ohm RTD, curve α=0.0038 ohms/ohm/°C)
  • Page 86 525B Users Manual *SRE? IEEE-488 RS-232 Sequential Overlapped (Service Request Enable query) Returns the byte in the Service Request Enable (SRE). Response: <value> (the decimal equivalent of the SRE byte, 0 to 191) Example: *SRE? returns 48 Returns 48 when bits 4 (MAV), and 5 (ESR) are enabled.
  • Page 87 Remote Commands Remote Command Listing TC_REF IEEE-488 RS-232 Sequential Overlapped (Thermocouple Reference command) Sets whether the internal temperature sensor (INT) or an external reference value (EXT) is used for Thermocouple (TC) outputs and measurements. The Calibrator retains the TC reference setting until power off or reset.
  • Page 88 525B Users Manual (1 mV/°C linear output) Example: TC_TYPE J Set the thermocouple type for simulating a temperature output to a J-type thermocouple. TC_TYPE? IEEE-488 RS-232 Sequential Overlapped (Thermocouple Type query) Returns the Thermocouple (TC) temperature sensor type. When the thermocouple type is changed while simulating a temperature output, the temperature is changed to 0 °C.
  • Page 89 Remote Commands Remote Command Listing TSENS_TYPE? IEEE-488 RS-232 Sequential Overlapped (Temperature Sensor Type query) Returns the temperature sensor type thermocouple (TC) or Resistance Temperature Detector (RTD) for temperature measurements. Responses: (Thermocouple) (Resistance Temperature Detector) Example: TSENS_TYPE? returns TC Returns TC when the temperature sensor type is a thermocouple. *TST? IEEE-488 RS-232...
  • Page 90 525B Users Manual *WAI IEEE-488 RS-232 Sequential Overlapped (Wait-to-Continue command) Prevents further remote commands from being executed until all previous remote commands have been executed. For example, if you send an OUT command, you can cause the Calibrator to wait until the output has settled before continuing on to the next command if you follow OUT with a *WAI command.

  • Page 91: Maintaining The Calibrator

    Chapter 6 Maintaining the Calibrator Maintenance Cleaning the Calibrator Warning To avoid personal injury or damage to the Calibrator, use only the specified replacement parts and do not allow water into the case. Caution To avoid damaging the case, do not use solvents or abrasive cleaners.

  • Page 92: Changing Line Voltage

    525B Users Manual To check or replace a fuse: 1. Disconnect line power. 2. Using the blade of a standard screwdriver, pry the tab at the base of the line fuse compartment. The compartment cover will pop part way out.
  • Page 93 Maintaining the Calibrator Maintenance 6. Verify you are using the appropriate fuse for the selected line voltage (See Table 6-1) and reinstall the fuse compartment by pushing it in until the tab locks in place. Line voltage indicator Changing line fuse Line fuse compartment Rotate to change...

  • Page 94: Performance Tests

    Fluke 742A-1K Resistance Resistance standard Fluke 742A-10K Resistance Multifunction calibrator Fluke 5520A Resistance Pressure module Any Fluke 700 series module Pressure Lead set 5520A — 525A Leads kit Provide test cables Precision thermometer ASTM56C Measure temperature Dewar flask with lid...

  • Page 95: Testing Dc Voltage

    Maintaining the Calibrator Performance Tests Testing DC Voltage The DC voltage amplitude accuracy test verifies the accuracy of DC voltage at the 525B calibrator front panel Volts Source output. Verify the measurements listed in Table 6-3. Table 6-3. Measuring DC Voltage Nominal Measured 90 Day Spec.

  • Page 96: Testing Dc Current

    Users Manual Testing DC Current Use the 8508A and the precision shunt to measure the 525B output as shown in Figure 6-2. Take the Voltage reading from the 8508A and divide it by the 742A-1 actual value to determine the current output. Verify the measurements listed in Table 6-4.

  • Page 97: Testing Thermocouple Output

    CJC test all functions of the TC output will have been checked. Typically, the cable needed to connect the 525B to the 8508A will need to be fabricated. The TC Mini-Connector will need Copper-Copper (White). Using Copper wire, connect the Mini-Connector to standard Banana Jacks.

  • Page 98: Testing Cjc (Cold Junction Compensation)

    The test setup is shown in Figure 6-4. Verify that the readings of the 525B and the precision thermometer are within the Type-J specifications: 90-day specification is 0.14 °C •...

  • Page 99: Testing Thermocouple Input

    Performance Tests Testing Thermocouple Input Set the 525B to TC input by pressing  . All 525B conditions will be the same as the Thermocouple Output test, CJC off, mV/°C mode. Connect the 525B to the 5520A as shown in Figure 6-5. Set the 5520A to the mV values listed in Table 6-5.

  • Page 100: Testing Ohms Output

    525B Users Manual Testing Ohms Output Use the precision DMM to measure the resistance output as shown in Figure 6-6 and Table 6-6. Note The 8508A must be in the “loI” (low current mode) when measuring 5 ohms in the 4 K ohm range or an overload will occur.

  • Page 101: Testing Ohms Input

    Maintaining the Calibrator Performance Tests Testing Ohms Input Before measuring ohms input, you need to “characterize” the ohms output of a 5520A. To achieve the needed accuracy, the 8508A will be used as a transfer standard and the 742A will be used as the reference standard. To find the true value of the 5520A output, use the ratio input function of the 8508A located on the front and rear panels.
  • Page 102 4. Move the 525B 4W RTD Ohm input to the output of the 5520A. 5. Output the same nominal values and note the 525B readings in the 525B reading column. 6. Subtract the actual 5520A value from the 525B reading and ensure that it is within the specified tolerance. 6-12...

  • Page 103: Testing Pressure Modules

    Testing Pressure Modules The Fluke 700 and 525A-P series pressure modules are calibrated separately from the 525B. The calibration follows the pressure module, so only a performance test is needed. Connect any of the Fluke 700 and 525A-P series pressure modules to the pressure module connector.

  • Page 104: Service Center Calibration Or Repair

    Service Center. Fluke assumes no responsibility for damage in transit. The Fluke 525B Calibrator covered by the warranty will be promptly repaired or replaced (at Fluke’s option) and returned to you at no charge. For more information about warranty terms, refer to the Warranty provided earlier in this manual.

  • Page 105: Replacement Parts

    Maintaining the Calibrator Replacement Parts Replacement Parts Replacement parts are shown in Figure 6-9. Table 6-8 provides a description and part number of each replacement part. fcn20f.eps Figure 6-9. Exploded View of the 525B 6-15...
  • Page 106 525B Users Manual Table 6-8. Replacement Parts Item Description Part Number Decal, Front Panel 1601576 Fuse Drawer 1617918  Fuse, 0.25 A/250 V (fast for 120 V operation) 1645311  Fuse, 0.125 A/250 V (fast for 240 V operation) 1645327...

  • Page 107: Accessories

    For more information about these accessories and their prices, contact your Fluke representative. Y525 Rack Mount Kit The Y525 rack mount kit provides all the hardware needed to mount the 525B on an equipment rack. Instructions are provided in the kit. 5520A – 525A Test Lead Kit The optional 5520A –...
  • Page 108 525B Users Manual Table 6-8 Fluke 700 Series Pressure Modules (continued) Fluke Model Number Range Type and Media Fluke-700PA4 0 to 15 psi absolute, wet Fluke-700PA5 0 to 30 psi absolute, wet Fluke-700PA6 0 to 100 psi absolute, wet Fluke-700PV3...

  • Page 109: Specifications

    Chapter 7 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 interface ..........RS-232, IEEE-488 (GPIB) Temperature performance Operating ............

  • Page 110: Electrical Specifications

    525B Users Manual Electrical Specifications DC Voltage Specifications, Output Absolute Uncertainty, tcal ± 5 °C Stability Maximum ± (ppm of output + μV) Ranges Resolution Burden 24 hours, ± 1 °C 90 days 1 year ± (ppm of output + μV) 1 μV...

  • Page 111: Resistance Specifications, Output

    Specifications Electrical Specifications Resistance Specifications, Output Absolute Uncertainty tcal ± 5°C, ± Ω Ranges Resolution Allowable Current 90 days 1 year 5 to 400.00 Ω 0.001 Ω 0.012 0.015 1 to 3 mA 0.01 Ω 100 μA to 1 mA 0.25 5 to 4.0000 kΩ...

  • Page 112: Thermocouple Specification, Output And Input

    525B Users Manual Thermocouple Specification, Output and Input Absolute Uncertainty tcal ± 5 °C, ± (°C) Range (°C) TC Type Output/Input Minimum Maximum 90 days 1 year 600 °C 800 °C 0.42 °C 0.46 °C 800 °C 1000 °C 0.39 °C 0.39 °C...

  • Page 113: Rtd And Thermistor Specification, Output

    Specifications Electrical Specifications RTD and Thermistor Specification, Output Absolute Uncertainty Range (°C) tcal ± 5 °C, ± (°C) RTD Type Minimum Maximum 90 days 1 year -200 °C -80 °C 0.03 °C 0.04 °C -80 °C 0 °C 0.04 °C 0.05 °C 0 °C 100 °C...

  • Page 114: Rtd And Thermistor Specification, Input

    525B Users Manual RTD and Thermistor Specification, Output (cont.) Absolute Uncertainty Range (°C) tcal ± 5 °C, ± (°C) RTD Type Minimum Maximum 90 days 1 year Cu 427, 10 Ω -100 °C 260 °C 0.30 °C 0.38 °C 15 °C 50 °C...
  • Page 115 Specifications Electrical Specifications RTD and Thermistor Specification, Input (cont.) Absolute Uncertainty Range (°C) tcal ± 5 °C, ± (°C) RTD Type Minimum Maximum 90 days 1 year -200 °C -80 °C 0.007 °C 0.008 °C -80 °C 0 °C 0.019 °C 0.020 °C 0 °C 100 °C...

  • Page 116: Pressure Measurement

    Users Manual Pressure Measurement The Calibrator can accept either the Fluke 700 or 525A-P series pressure modules. Pressure modules plug directly into the front panel Lemo connector with the Calibrator firmware autodetecting the type and value of the module you are attaching.

This manual is also suitable for:

525b/a0

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