Page 3 - Table of Contents
Table of Contents 1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . ...
Page 5 - Figures; Figure 1
iii Figures Figure 1 Connecting a four-wire probe . . . . . . . . . . . . . . . . . . . . . . 12 Figure 2 1502A Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 3 1502A Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 4 Parameter Menu Structur...
Page 6 - Tables
iv Tables Table1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1 Table 2 Matching Certificate Values to 1502A ITS-90 Coefficients . . . . . . . 18 Table 3 Setting Coefficients Rtpw, a8, b8, a4, and b4 . . . . . . . . . . . . . . 19 Table 4 Setting Coefficients Rtpw, a5, ...
Page 7 - Symbols Used
1 Before You Start 1.1 Symbols Used Table 1 lists the symbols that may be used on the instrument or in this manual and the meaning of each symbol. Symbol Description AC (Alternating Current) AC-DC Battery Complies with European Union Directives DC (Direct Current) Double Insulated Electric Shock Fus...
Page 8 - Safety Information; The following definitions apply to the terms “Warning” and “Caution”.; Warnings; use this unit for any application other than calibration work.; DO NOT; use this unit in environments other than those listed in the user's; DO NOT; use this instrument in combination with any probe to measure the
Symbol Description On Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re-fers to the level of Impulse Withstand Voltage protection provided. Equipment ofOVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied fromthe fixed installa...
Page 9 - To avoid possible burn hazards, follow these guidelines.; Cautions; overheat probes beyond their recommended temperature range.; allow the probe hub or wires to be exposed to excessive
Before initial use, or after transport, or after storage in humid or semi-humidenvironments, or anytime the instrument has not been energized for more than10 days, the instrument needs to be energized for a "dry-out" period of 2 hoursbefore it can be assumed to meet all of the safety require...
Page 10 - Authorized Service Centers
Keep the probe wires clean and away from fluids. 1.3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinateservice on your Hart product: Fluke Corporation, Hart Scientific Division 799 E. Utah Valley Drive American Fork, UT 84003-9775 USA Phone: +1.80...
Page 11 - Fluke South East Asia Pte Ltd.
Fluke South East Asia Pte Ltd. Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace #03-16 The Comtech (Lobby D) 118502 SINGAPORE Phone: +65 6799-5588 Telefax: +65 6799-5588 E-mail: [email protected] When contacting these Service Centers for support, please have the followinginformati...
Page 14 - Environmental Conditions; The instrument operates safely under the following conditions:
Weight 2.2 lb. (1.0 kg) Safety OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 perIEC 1010-1 1 Accuracy specifications apply within the recommended operating temperature range. Accuracy limits are increased by a factor of the temperature coefficient outside this range. 2 Short-term accura...
Page 15 - Unpacking; Power
4 Quick Start This section briefly explains the basics of setting up and operating your 1502Athermometer readout. 4.1 Unpacking Unpack the thermometer carefully and inspect it for any damage that may haveoccurred during shipment. If there is shipping damage, notify the carrierimmediately. Verify tha...
Page 17 - Front Panel Buttons
5 Parts and Controls 5.1 Front Panel Buttons See Figure 2. The front panel buttons are used to select units of measurement, access operat-ing parameters, and alter operating parameters. The function of each button isas follows: C/Probe —This button selects units of degrees Celsius. In conjunction wi...
Page 18 - Rear Panel; Serial Port
5.2 Rear Panel See Figure 3 . Serial Port - The DB-9 connector is for interfacing the thermometer to a com- puter or terminal with serial RS-232 communications. Probe Connector - At the rear of the thermometer is the probe connector. The probe must be connected for operation. Power Switch - The powe...
Page 19 - Selecting Units; Menu Lockout
6 General Operation This section explains basic operation of the 1502A Thermometer. 6.1 Selecting Units Temperature can be displayed in degrees Celsius (indicated with “ C ”), degrees Fahrenheit (indicated with “ F ”), or Kelvin (indicated with “ A ” for absolute). The resistance of the sensor can a...
Page 21 - Setting the Probe Characterization Type; Probe; Probe
when all the digits are correct. If the password is entered correctly the first pa-rameter in the menu will appear. 6.4 Selecting the Probe Characterization Before the 1502A can measure temperature accurately it must know how to cal-culate temperature from the resistance of the sensor. You must sele...
Page 22 - ITS-90 PRT and Coefficients; tional Temperature Scale of 1990
digit will flash. Use the U and D buttons to change a digit. Once the sign and digits are correct, press Enter to accept the number. If you decide to cancel any changes you have made, you may do so by pressing the Ω / Exit button. This will immediately skip to the next coefficient. If the coefficien...
Page 25 - tESt
6.4.5 IPTS-68 Conversion The IPTS-68 characterization converts resistance to temperature according tothe International Practical Temperature Scale of 1968. The applicable coeffi-cients are R 0 (“ r0 ”), α (“ ALPHA ”), δ (“ dELtA ”), a 4 (“ A4 ”), and c 4 (“ C4 ”). You can also select the temperature...
Page 26 - Filtering; SA Par; Setting the Current; CurrEnt; Power Saver; PO SA
Compare this temperature with the temperatures listed on the probe calibrationreport to verify that the coefficients you entered are correct. 6.5 Filtering While measuring temperature, the readings may appear to vary. This may bedue to actual variations in temperature or electrical noise internal to...
Page 27 - Serial Interface; Comm; press the; Comm
7 Digital Communications Interface Remote communications allows an external device, such as a computer, to com-municate with the 1502A to obtain measurement data and control its operation.Communication is accomplished with various commands issued to the 1502Athrough the RS-232 port or optional IEEE-...
Page 28 - Automatic Transmission of Measurements; SA PEr; Time Stamp and System Clock; CLOC
7.1.2 Automatic Transmission of Measurements The 1502A can be programmed to automatically send measurements to a re-mote printer or terminal. The transmission interval is set using the “ SA PEr ” sample period parameter. This is set in the Comm menu after the baud rate pa- rameter. The display will ...
Page 29 - Duplex Mode and Linefeed
to the time stamp parameter. The display will briefly show “ ti Sta ” then the time stamp state which is either ON or OFF. Use the U and D buttons to change the state and press Enter . ON enables transmission of the time stamp and OFF disables it. The time stamp can also be set using the “ST” commun...
Page 30 - Setting the Address; SErIAL; IEEE; Setting the Termination Character; Time Stamp; Remote Commands; Measurement Commands
7.2.1 Setting the Address The IEEE-488 bus requires that each device has a unique address. The defaultaddress of the 1502A is 22 but can be changed if necessary. The IEEE-488 ad-dress of the 1502A is set within the Comm menu after the serial linefeed pa- rameter. (This menu option will not appear if...
Page 32 - Reading Temperature; The syntax of the response is as follows:
7.3.1.1 Reading Temperature The most recent temperature measurement can be read using the followingcommand: T<EOS> reads the most recent measurement The syntax of the response is as follows: t:_nnnn.nnn_u or t:_nnnn.nnn_u_hh:mm:ss The _’s represent space characters. The n’s represent the digit...
Page 33 - The system clock is set in 24-hour format using the command:; Probe Characterization Commands; The following commands relate to reading measurement data.
7.3.1.2 Automatically Transmitting Measurements By setting the sample period, the 1502A can be programmed to automaticallytransmit measurements from the RS-232 port at specified intervals. The sampleperiod can be set remotely using the commands: SA=[[hh:]mm:]ss<EOS> sets the sample period SA=0...
Page 34 - Sample Commands
7.3.2.1 Selecting the Characterization The following commands can be used to select the probe characterization andcoefficients: P=90<EOS> selects the ITS-90 characterization P=68<EOS> selects the IPTS-68 characterization P=R<EOS> or P=S<EOS> selects the standard Callendar-Van...
Page 35 - Communication Commands; The following commands relate to external communications.; Setting the Duplex Mode
7.3.3.1 Setting the Filter The filter helps to reduce variations in the measurements. The filter can be setremotely using the command: FI=<value><EOS> sets the filter time constant FI=0<EOS> disables the filter The value is the filter time constant in seconds. It must be between 0 ...
Page 36 - Calibration Commands; The following commands are used in calibrating the instrument.; Entering the Password; The following command is used to set the serial number of the 1502A:; Other Commands; Remaining commands are described below.; Instrument Identification
LF=OF<EOS> disables linefeed 7.3.5 Calibration Commands The following commands are used in calibrating the instrument. 7.3.5.1 Entering the Password In order to set the calibration parameters the password must be issued first. Thefollowing command enables access to the calibration parameters: ...
Page 37 - Reading a List of Commands
ver. mmmmm,v.vv The m ’s represent digits of the model number. The v ’s represent the digits of the firmware version number. As an example, if the version number was 1.10the response would be “ver.1502A,1.10". The following IEEE-488.2 and SCPI compatible command can be used to readthe manufactur...
Page 38 - does not affect the correction at 100; Accessing the Calibration Parameters
8 Calibration Procedure The 1502A uses a three-point calibration scheme with a quadratic polynomialcorrection function to maintain the accuracy of its resistance measurement. Thethree calibration points are at 0 Ω , 100 Ω , and 400 Ω . Three calibration pa- rameters determine the correction function...
Page 41 - Troubleshooting
10 Troubleshooting In case you run into difficulty while operating the 1502A, this section providessome suggestions that may help you solve the problem. Below are several situa-tions that may arise followed by possible causes of the problem and suggestedactions you might take. Incorrect Temperature ...
Page 42 - CE Comments; EMC Directive; Electrical equipment for
• Stem conduction error. The problem may be that the actual temperature of the sensor is not what you expect. This is often the result of stem con-duction where heat flowing through the stem of the probe to ambient af-fects the temperature of the probe. It is very important that immersionprobes be i...
