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Fluke 525A User Manual

Temperature/pressure calibrator
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99 Washington Street
Melrose, MA 02176
Fax 781-665-0780
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525A
Temperature/Pressure Calibrator
Users Manual
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Summary of Contents for Fluke 525A

  • Page 1 99 Washington Street Melrose, MA 02176 Fax 781-665-0780 TestEquipmentDepot.com ® 525A Temperature/Pressure Calibrator Users Manual...
  • 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

    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 ..................1-6 Display Error Messages ................
  • Page 4 Extra Space or Tab Characters ............. 4-20 Terminators ..................4-20 Incoming Character Processing............4-21 Response Message Syntax..............4-21 Checking 525A Status ..................4-23 Serial Poll Status Byte (STB) ..............4-24 Service Request (SRQ) Line ..............4-25 Service Request Enable Register (SRE)..........4-26...
  • Page 5 Contents (continued) Programming the STB and SRE ............4-26 Event Status Register (ESR) ..............4-26 Event Status Enable (ESE) Register ............ 4-26 Bit Assignments for the ESR and ESE ..........4-27 Programming the ESR and ESE............4-28 Output Queue ................... 4-28 Error Queue ....................
  • Page 6 525A Users Manual Resistance Specifications, Output ..............7-3 Resistance Specifications, Input..............7-3 Thermocouple Specification, Output and Input ..........7-4 RTD and Thermistor Specification, Output ............ 7-6 RTD and Thermistor Specification, Input ............7-8 Pressure Measurement..................7-10...
  • Page 7 Required Equipment ..................6-4 6-4. TC Temperatures .................... 6-7 6-5. Ohms Output Ranges ..................6-11 6-6. Ohms Ratio Table ................... 6-13 6-7. Replacement Parts................... 6-17 6-8. Fluke 700 SeriesPressure Modules ..............6-18 6-9. Fluke 6100 Series Pressure Modules .............. 6-19...
  • Page 8 525A Users Manual...

  • Page 9: List Of Figures

    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. 1281 Connection Diagram ................6-12 6-8. Connection for Measuring Ohms..............6-14 6-9. Exploded View of the 525A ................6-16...
  • Page 10 525A Users Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com viii...

  • Page 11: Getting Started

    Chapter 1 Getting Started Introduction Your Fluke 525A Temperature/Pressure Calibrator (referred to as “the Calibrator”) is an instrument designed to meet the demands of your process tools calibration workload. In addition to the functions in Table 1-1, the Calibrator has the following features and functions.

  • Page 12: Standard Equipment

    Chapter 6. • 525A Getting Started Guide, Part No. 1601541 • 525A CD-ROM (contains the 525A Users Manual and 525A Getting Started Guide), Part No. 1601552 • Power Cord (120 V cord, Part No.1618621 or 240 V cord, Part No. 769422) •...
  • Page 13 Getting Started Safety Information CAT II equipment is designed to protect against transients from energy-consuming equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and other household appliances. A “WWarning” statement identifies hazardous conditions and actions that could cause bodily harm or death.

  • Page 14: Symbols Used On The Calibrator

    525A 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 NRTL Important Information. Refer to International ON/OFF symbol. the manual.

  • 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. 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX VOLTS TYPE OUTPUT...

  • Page 16: Using The Keys

    525A 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. STBY VOLTS TYPE 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 RTD. Selects the pressure measurement mode. Selects a thermocouple or RTD type.

  • Page 18: Function Keys

    525A Users Manual VOLTS TYPE STBY UNITS OUTPUT INPUT ZERO SHIFT SETUP C / F RECALL AUTOSET RNG LOCK LOCAL • ENTER ajr11f.wmf Figure 1-3. Calibrator Function Keys Table 1-4. Function Keys Name Description RNG LOCK Activates/deactivates the autorange feature of the Calibrator in Voltage source modes.
  • Page 19 Getting Started Getting Acquainted with the Calibrator Table 1-4. Function Keys (cont) Name Description Press J to advance through the LCD Backlight, Interface, and SETUP Address menus. • Use M and O to adjust LCD backlight when the LCD menu is displayed.

  • Page 20: Display Error Messages

    525A Users Manual Table 1-4. Function Keys (cont) Name Description RECALL Used to recall a programmed set point. Press I 2. 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 RS-232 connector is used for serial remote control of the 525A. Figure 1-4. Rear Panel View 1-11...
  • Page 22 525A Users Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 1-12 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 23: Using Output Mode

    When adjusting an output using the M O 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 Temperature Using A Thermocouple

    525A Users Manual Simulating Temperature Using a Thermocouple 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.

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

    5. Use the numeric keypad to enter the desired output value and press J. You can also adjust the output value by pressing M O. Press L N to select a different digit to modify. 6. Press A to activate output. MULTIFUNCTION CALIBRATOR 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX V mA...

  • Page 26: Simulating Custom Rtd Coefficients

    525A 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 C to select RTD mode. 2. Press E 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

    525A Users Manual Entering Custom Standard Platinum Resistance Thermometer (SPRT) Coefficients To enter coefficients for a custom SPRT 1. Press C to enter RTD mode. 2. Press E until you get the display and press J. RTD SPRT and press J.

  • Page 29: Output Dc Voltage

    4. Press A to activate output. Note For safety purposes, the Calibrator resets to standby when output is set to 30 V or greater. MULTIFUNCTION CALIBRATOR 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX V mA ZERO...

  • Page 30: Output Resistance

    525A Users Manual Output Resistance To output resistance 1. Connect the Calibrator to the UUT as shown in Figure 2-4. 2. Press C until RTD mode is selected. 3. If necessary, press I 7 for RTD OUT mode. 4. Press E to select the appropriate ohms output range (400 or 4000 ohms).

  • Page 31: Output Current

    4. Press A activate output. Note If OVER LOAD appears on the display you may not have a completed circuit loop. When the circuit is complete, the message will disappear. MULTIFUNCTION CALIBRATOR 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX V mA ZERO...
  • Page 32 525A Users Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 2-10 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 33: Using Input Mode

    Fluke 700 and 6100 series pressure modules. 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 34: Measuring Temperature Using Thermocouples

    525A Users Manual MULTIFUNCTION CALIBRATOR 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX V mA ZERO LOOP VOLTS TYPE OUTPUT STBY 100V MAX UNITS V mA MEAS SOURCE ˚ ˚ INPUT/OUTPUT 20V PK OUTPUT INPUT ZERO SHIFT STORE 100% SETUP...
  • Page 35 3. If necessary, press I 8 to place the Calibrator in TC IN mode. 4. Press E to select the desired TC type. You can toggle between ºC and ºF temperature units by pressing I 6. MULTIFUNCTION CALIBRATOR 525A 100 A MA 100V MA 100% R CA ajr07f.eps...

  • Page 36: Thermocouple Zero Calibration

    525A 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 18ºC to 28ºC. 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)

    3. If necessary, press I 8 to put the Calibrator in RTD IN mode. 4. Press E to select the desired RTD type. You can toggle between ºC and ºF temperature units by pressing I 6. MULTIFUNCTION CALIBRATOR 525A TEMPERATURE / PRESSURE CALIBRATOR VOLTS 100mA MAX V mA...
  • Page 38 525A Users Manual To measure temperature using an RTD probe 1. Connect an RTD probe to the Calibrator as shown in Figure 3-4. 2. Press C to select the RTD mode. 3. If necessary, press I 8 to put the Calibrator in RTD IN mode.

  • 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 C to select RTD mode. 2. Press E until you get the display.

  • Page 40: Default Rtd Coefficients

    525A 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 C to enter RTD mode. 2. If necessary, press I 7 for RTD IN mode. 3. Press E until you get the display and press J.

  • 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 525A for Name:, and select OK. 3. Select PC serial port which 525A is connected to (from drop-down list), for Connect using: and select OK 4. Select the following setting and then select OK:...
  • Page 46 525A Users Manual SERIAL FROM HOST COM Port Port 525A Calibrator Controller System for a UUT without a remote port. SERIAL FROM HOST RS-232 COM Port COM Port Port Port 525A Calibrator Controller System for a UUT with an RS-232 port (via PC).

  • Page 47: Rs-232 Interface Overview

    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. Number of Devices A maximum of 15 devices can be connected in a single IEEE-488 bus system.
  • Page 48 525A Users Manual IEEE-488 Port IEEE-488 Port 525A Calibrator Controller System for a UUT without a remote port. 525A Calibrator Controller System for a UUT with an IEEE-488 remote port. RS-232 COM Port Port 525A 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 525A 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...

  • 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 525A 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 525A front panel controls are totally locked out. The top line of the display changes to: REM.

  • Page 52: Ieee-488 Interface Overview

    525A 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: Ieee-488 Remote Message Coding

    Remote Operation IEEE-488 Interface Overview The IEEE-488 interface is based on the IEEE Standards 488.1 and 488.2. For detailed information, refer to the IEEE-488.1 and IEEE-488.2 standards. IEEE-488.1 IEEE-488.1 is the hardware portion of the interface. The parallel signal lines are divided into eight lines for the data bus, three lines for the handshake, and five lines for bus management.
  • Page 54 525A Users Manual Table 4-4 IEEE-488 Remote Message Coding (continued) MESSAGE DATA HAND- DESCRIPTION SHAKE MANAGEMENT MESSAGE NAME Data Valid U HS Device Clear M UC U ST End Of String M DD B8 B7 B6 B5 B4 B3 B2 B1...

  • Page 55: Using Commands

    Remote Operation Using Commands Table 4-4 IEEE-488 Remote Message Coding (continued) MESSAGE DATA HAND- DESCRIPTION SHAKE MANAGEMENT MESSAGE NAME Ready For Data U HS Request For Service U ST Secondary Command Group M SE Selected Device Clear M AC Serial Poll Disable M UC Serial Poll Enable M UC...

  • Page 56: Types Of Commands

    525A Users Manual RS-232 Mode The RS-232 mode is used when the Calibrator is operated by terminal or computer program. In this mode, requested information is returned by query, and interface messages are queued and returned by command. Types of Commands The commands for the Calibrator can be grouped into one or more categories, depending on how they function.
  • Page 57 Remote Operation Using Commands An important thing to note about interface messages is that unlike device- dependent and common commands, interface messages are not sent literally (in a direct way). For example, when you send a device-dependent query to the Calibrator, the controller automatically sends the interface message MTA (My Talk Address).

  • Page 58: Ieee-488 Interface Messages (Received)

    Trigger a TC measurement and put the reading in the output buffer. Trigger Go To Local Transfer control of the 525A from one of the remote states to one of the local states. (See Table 4-2) Local Lockout Transfers remote/local control of the 525A. (See Table 4-2) Interface Clear A control line that sets the interface to a quiescent state.

  • Page 59: Compound Commands

    Refer to “Checking 525A Status” for details. Status Byte The status byte is what the 525A 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 60: 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 525A Status.”) Sequential Commands Commands that execute immediately are called sequential commands.

  • Page 61: Command Syntax

    Remote Operation Using Commands 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. All commands and units may be entered in upper or lower case.

  • Page 62: Extra Space Or Tab Characters

    525A Users Manual 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.

  • Page 63: Incoming Character Processing

    Remote Operation Using Commands 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 64: Response Data Types

    This type of response is always a keyword. Response Example: OUT 1V; FUNC? Data (CRD) Returns: Indefinite Any ASCII characters followed by EOM. Queries with this type of response MUST ASCII (IAD) be the last Query in a program message. Example: *IDN? Returns: FLUKE,525A,<serial number>,<firmware version> 4-22...

  • Page 65: Checking 525A Status

    Remote Operation Checking 525A Status Checking 525A Status You have access to status registers, enable registers, and queues in the Calibrator to indicate various conditions in the instrument as shown in Figure 4-5. Some registers and queues are defined by the IEEE-488.2 standard. The rest are specific to the Calibrator.

  • Page 66: Serial Poll Status Byte (Stb)

    525A Users Manual Serial Poll Status Byte (STB) The Calibrator sends the serial poll status byte (STB) when it responds to a serial poll. This byte is cleared (set to 0) when the power is turned on. The STB byte is defined as shown in Figure 4-5.

  • Page 67: Service Request (Srq) Line

    Requesting service. The RQS bit is set to 1 whenever bits ESB, MAV, EAV, or ISCB change from 0 to 1 and are enabled (1) in the SRE. When RQS is 1, the 525A asserts the SRQ control line on the IEEE-488 interface. You can do a serial poll to read this bit to see if the 525A is the source of an SRQ.

  • Page 68: Service Request Enable Register (Sre)

    525A 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 69: Bit Assignments For The Esr And Ese

    Device-dependent error. An error related to a device-dependent command has occurred. Query error. The 525A 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 70: Programming The Esr And Ese

    525A 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 71 Remote Operation Checking 525A 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 72 525A Users Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 4-30 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 73: 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 74: External Connection Commands

    525A 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 75: 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 76: Status Commands

    Number Class Description Error queue overflow. OPER or STBY was received when the 525A 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 77: Remote Command Listing

    The command string buffer overflowed. The serial output buffer overflowed. The output overloaded. 525A is out of tolerance. This error is set after a failed initialization or a failed *TST?. 525A has a ADC failure. This error is set after a failed initialization or a failed *TST?.
  • Page 78 525A 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 79 1. Manufacturer 2. Model number 3. Serial number (always 0) 4. Firmware revision levels for the main, front panel, and inguard CPUs. Example: *IDN? returns FLUKE,525A,0,1.2 Returns Fluke manufacturer, model 525A, serial number 0, firmware version 1.2.
  • Page 80 525A Users Manual LOCAL IEEE-488 RS-232 Sequential Overlapped (Local command) Puts the Calibrator into the local state, clearing the remote state (see the REMOTE command) and front panel lockout (see the LOCKOUT command). This command duplicates setting the IEEE-488 REN line to false.
  • Page 81 Remote Commands Remote Command Listing *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. (See *WAI.) Response: (all operations are complete) Example: *OPC? returns 1 Returns 1 when all pending operations are complete.
  • Page 82 525A 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 83 (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 84 525A 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 85 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 86 525A 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 87 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 88 525A 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 89 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 90 525A Users Manual TC_TYPE IEEE-488 RS-232 Sequential Overlapped (Thermocouple Type command) Sets the Thermocouple (TC) temperature sensor type. The TC type is used when the output is set to a temperature value with the OUT command and the temperature sensor type is set to TC with the TSENS_TYPE command.
  • Page 91 Remote Commands Remote Command Listing 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. Responses: (B-type thermocouple) (C-type thermocouple) (E-type thermocouple) (J-type thermocouple)
  • Page 92 525A Users Manual 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.
  • Page 93 Remote Commands Remote Command Listing *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 94 525A Users Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 5-22 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 95: Maintaining The Calibrator

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

  • Page 96: Changing Line Voltage

    525A 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 97 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 98: Performance Tests

    DC Current Resistance standard 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...

  • Page 99: 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 525A calibrator front panel Volts Source output. Nominal Measured 90 Day Spec. One Year Range Value (V) Value Deviation % Spec.

  • Page 100: Testing Dc Current

    Users Manual Testing DC Current Use the Wavetek 1281 and the precision shunt to measure the 525A output as shown in Figure 6-2 . Take the Voltage reading from the Wavetek 1281 and divide it by the 742A-1 actual value.

  • Page 101: Testing Thermocouple Output

    “Cu” for copper and copper. Connect the mini-connector to the front of the 525A TC input/output connector and the other end to the Wavetek 1281 DC voltage input. See Figure 6-3 for a connection diagram. Output the simulated thermocouple temperatures listed in Table 6.4.

  • Page 102: Cjc (Cold Junction Compensation) Calibration

    525A Users Manual CJC (cold junction compensation) Calibration Connect a Type-J thermocouple to the TC terminals on the Calibrator, and immerse the thermocouple and a precision thermometer in a mineral oil lag bath. The test setup is shown in Figure 6-4. Verify the reading of the thermometer and the Calibrator are within the thermocouple specifications listed in Chapter 7.

  • Page 103: Testing Thermocouple Input

    XCJC on the display indicates that the CJU is turned off. The mini-connector will have the designation “Cu” for copper and copper. Connect the mini-connector to the front of the 525A TC input/output connector and the other end to the 5520A DC voltage output. See Figure 6-5. Output the simulated thermocouple temperatures listed in Table 6-4.

  • Page 104: Testing Ohms Output

    525A Users Manual Testing Ohms Output Use the precision DMM to measure the resistance output. Figure 6-6 shows the four-wire connections. Set the DMM to the “TRU OHMS” setting. See the 1281 Operators Manual for information on using the “TRU OHM” setting.

  • Page 105: Ohms Output Ranges

    Maintaining the Calibrator Performance Tests Table 6-5. Ohms Output Ranges Range (Ω) Output (Ω) 1 Year (Ω) 0.03 0.03 0.03 0.03 4000 1000 2000 3000 4000 6-11...

  • Page 106: Testing Ohms Input

    525A Users Manual Testing Ohms Input Before measuring ohms input, you need to “characterize” the ohms output of a 5520A. To achieve the needed accuracy, the Wavetek 1281 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, the ratio input function of the Wavetek 1281 will be used.

  • Page 107: Ohms Ratio Table

    0 ohm value. Use the formula (742A actual value/ratio indication * 100 = actual 5520A value) and enter that ohm value into the 5520A actual value column. Table 6-6. Ohms Ratio Table 742A Value 5520A Actual Range (Ω) (Ω) Ratio Value (Ω) 525A Reading Spec. 0.002 0.006 0.01 0.014 0.018 4000 0.02 1000 0.06...

  • Page 108: Testing Pressure Modules

    525A Users Manual First apply a four wire short to the 525A 4W RTD Ohm input. Set the 525A to the 400 ohm range. Note the reading. Set the 525A to the 4000 ohm range. Note the reading. Move the 525A 4W RTD Ohm input to the output of the 5520A. Output the same nominal values and note the 525A readings in the 525A reading column.

  • Page 109: Service Center Calibration Or Repair

    Service Center. Fluke assumes no responsibility for damage in transit. The Fluke 525A 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 110: Replacement Parts

    525A Users Manual Replacement Parts Replacement parts are shown in Figure 6-9. Table 6-9 provides a description and part number of each replacement part. ajr20f.eps Figure 6-9. Exploded View of the 525A 6-16...

  • Page 111: Replacement Parts

    Maintaining the Calibrator Replacement Parts Table 6-7. Replacement Parts Item Description Part Number Decal, Front Panel 1601576 Fuse Drawer 1617918 W Fuse, 0.25 A/250 V (fast for 120 V operation) 1645311 W Fuse, 0.125 A/250 V (fast for 240 V operation) 1645327 Output Block 1601601...

  • Page 112: 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 525A on an equipment rack. Instructions are provided in the kit. 5520A – 525A Test Lead Kit The optional test lead kit, 5520A –...

  • Page 113: Fluke 6100 Series Pressure Modules

    Maintaining the Calibrator Accessories 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 0 to –...
  • Page 114 525A Users Manual 6-20 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 115: 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 Optional interface IEEE-488 (GPIB) 0 °C to 50 °C Temperature performance...

  • Page 116: Dc Voltage Specifications, Output

    525A Users Manual DC Voltage Specifications, Output Absolute Uncertainty, tcal ±5 °C ± (ppm of output +µV) Stability 24 hours, ±1 °C Maximum ± (ppm of output +µV) Burden Ranges Resolution 90 days 1 year 1 µV 0 to 100.000 mV...

  • Page 117: Dc Current Specifications, Output

    Specifications DC Current Specifications, Output DC Current Specifications, Output Absolute Uncertainty, Maximum Maximum tcal ±5 °C ± (ppm of output +µA) Compliance Inductive Ranges Resolution Voltage Load 90 days 1 year 1 µA 100 µH 0 to 100.000 mA 10 V 1.

  • Page 118: Thermocouple Specification, Output And Input

    525A Users Manual Thermocouple Specification, Output and Input Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (° C) Output/Input TC Type 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 119 Specifications Thermocouple Specification, Output and Input Thermocouple Specification, Output and Input (continued) Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (° C) Output/Input TC Type Minimum Maximum 90 days 1 year 0 °C 250 °C 0.58 °C 0.58 °C 250 °C 400 °C 0.34 °C 0.35 °C...

  • Page 120: Rtd And Thermistor Specification, Output

    525A Users Manual RTD and Thermistor Specification, Output Absolute Uncertainty tcal ±5 °C, ±(°C) Range (° C) RTD Type Minimum Maximum 90 days 1 year Pt 385, 100 Ω –200 °C –80 °C 0.06 °C 0.07 °C –80 °C 0 °C 0.08 °C...
  • Page 121 Specifications RTD and Thermistor Specification, Output RTD and Thermistor Specification, Output (continued) Absolute Uncertainty tcal ±5 °C, ±(°C) Range (° C) RTD Type Minimum Maximum 90 days 1 year Pt 385, 1000 Ω –200 °C –80 °C 0.06 °C 0.07 °C –80 °C 0 °C 0.06 °C...

  • Page 122: Rtd And Thermistor Specification, Input

    525A Users Manual RTD and Thermistor Specification, Input Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (° C) RTD Type Minimum Maximum 90 days 1 year Pt 385, 100 Ω –200 °C –80 °C 0.031 °C 0.012 °C –80 °C 0 °C 0.018 °C...
  • Page 123 Specifications RTD and Thermistor Specification, Input RTD and Thermistor Specification, Input (continued) Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (° C) RTD Type Minimum Maximum 90 days 1 year Pt 385, 500 Ω –200 °C –80 °C 0.046 °C 0.047 °C –80 °C 0 °C 0.049 °C...

  • Page 124: Pressure Measurement

    Users Manual Pressure Measurement The Calibrator can accept either the Fluke 700 or 6100 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.

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