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
iii Figures Figure 1 Connecting a four-wire probe . . . . . . . . . . . . . . . . . . . . . . 12 Figure 2 12 V DC power source polarity . . . . . . . . . . . . . . . . . . . . . 13 Figure 3 1504 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 4 1504 Back Panel . . . ....
Page 6 - Tables; Table 2
iv Tables Table1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1 Table 2 Typical Values for Thermistor Coefficients . . . . . . . . . . . . . . . 20 Table 3 Setting Coefficients a, b, and c . . . . . . . . . . . . . . . . . . . . . . 21 Table 4 Setting Coefficients a, b,...
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 10 - Cautions; Authorized Service Centers
1.2.2 Cautions To avoid possible damage to the instrument, follow these guidelines. DO NOT change the values of the calibration constants from the factory set values unless you are recalibrating the instrument. The correct setting of theseparameters is important to the safety and proper operation of...
Page 15 - Environmental Conditions; The instrument operates safely under the following conditions:
Communications RS-232 serial standard, IEEE-488 (GPIB) optional, Conforms to IEEE-488.1, Capability: AH1, SH1, T6, L4, DC1 Operating TemperatureRange Full accuracy: 13°C to 33°CAbsolute: 0°C to 55°C AC Power 115 VAC (±10%), 50/60 Hz, 10 W, nominal 1 A maximum230 VAC (±10%), 50/60 Hz, 10 W (optional)...
Page 16 - Unpacking
4 Quick Start This section briefly explains the basics of setting up and operating your 1504thermometer 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 that...
Page 17 - DC Power Option
to pins 4 and 5. (Pins 1 and 5 source current and pins 2 and 4 sense the poten-tial.) If a shield wire is present it should be connected to pin 3. A two-wire probe can also be used with the 1504. It is connected by attachingone wire to both pins 1 and 2 of the plug and the other wire to both pins 4 ...
Page 18 - Certain precautions must be observed with the battery and
ductor is positive and the inside is negative. When operating in DC mode, theAC power switch on the rear panel is not functional. The optional 9313 Battery Pack, available from Hart Scientific, can be used asa portable power source for the 1504. It includes a 1.2 amp-hr 12V sealedlead-acid battery, ...
Page 19 - The DC power option includes a low voltage indicator. The low
NOTE: The DC power option includes a low voltage indicator. The low voltage indicator needs to be plugged into the instrument with the batteryoption plugged in to the low voltage indicator. The low voltage indicatorlight illuminates when the voltage drops below a safe operating range. Theinstrument ...
Page 20 - Front Panel Buttons
5 Parts and Controls 5.1 Front Panel Buttons See Figure 3. 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 21 - Rear Panel; Serial Port
5.2 Rear Panel See Figure 4 . 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 22 - Selecting Units; Menu Lockout; Enter
6 General Operation This section explains basic operation of the 1504 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 al...
Page 24 - Setting the Probe Characterization Type; ProbE; Setting the Characterization Coefficients
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 1504 can measure temperature accurately it must know how to cal-culate temperature from the resistance of the sensor. You must enter...
Page 25 - Steinhart-Hart Characterization; r T K
E -04 Increase or decrease the exponent using the U and D buttons. Once the ex- ponent is correct, press Enter to store it. 6.4.3 Steinhart-Hart Characterization Thermistors are most often characterized using the Steinhart-Hart equation: r T K exp B B T B T B T o ( [ ])[ ] [ ] Ω = + + + − − − 1 1 2 ...
Page 26 - The RTD conversion uses the Callendar-Van Dusen equation:; The coefficients
b=4.6354171E03, c=-1.2531030E05, and d=-6.2365913E06. Set the 1504 pa-rameters with values from the certificate as follows. Example 2: A thermistor’s calibration certificate gives coefficients a=-4.2501569E00,b=3.8997001E03, and c=-1.4225654E07. Set the 1504 parameters with valuesfrom the certificat...
Page 27 - Testing the coefficients; Probe; tESt; Filtering; Sample; SA Par; Power Saver
[ ] ( ) ( ) ( ) [ ] r t C R At B R At Bt C t t t t ° = + + + + + − ≥< ⎧ ⎨ ⎩⎪ 0 2 0 2 3 1 1 100 0 0 The A, B, and C coefficients can be converted to α, δ , and β coefficients using the following formulas: α δ β = + = − + = − + A B A B C A B 100 100 100 1 10 100 8 6.4.5 Testing the coefficients The...
Page 28 - PO SA
play as an indication that the 1504 is still operating. Pressing any button on thefront panel restores the display. You can program the power saver to activate af-ter a specified period of time from 5 minutes to 60 minutes in intervals of 5minutes. You can also disable the power saver feature comple...
Page 29 - Serial Interface; Setting the Baud Rate; SErIAL
7 Digital Communications Interface Remote communications allows an external device, such as a computer, to com-municate with the 1504 to obtain measurement data and control its operation.Communication is accomplished with various commands issued to the 1504through the RS-232 port or optional IEEE-48...
Page 30 - Automatic Transmission of Measurements; SA PEr; Time Stamp and System Clock; CLOC
7.1.2 Automatic Transmission of Measurements The 1504 can be programmed to automatically send measurements to a remoteprinter 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 parameter. The display will brief...
Page 31 - 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 32 - Setting the Address; 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 1504 is 22 but can be changed if necessary. The IEEE-488 ad-dress of the 1504 is set within the Comm menu after the serial linefeed param- eter. (This menu option will not appear if t...
Page 34 - Reading Temperature; The syntax of the response is as follows:; Automatically transmitting measurements
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 35 - The system clock is set in 24-hour format using the command:; Probe Characterization Commands; The following commands relate to reading measurement data.; Selecting the Characterization; for the Callendar-Van Dusen characterization
SA=5:00<EOS> sets the sample period to 5 minutes SA=1:00:00<EOS> sets the sample period to 1 hour 7.3.1.3 Selecting the Unit of Measurement The selected unit is used in displaying measurements on the front panel and inreading measurements from the communications interfaces. The following...
Page 36 - Testing the Characterization; Sample Commands; The following commands ralate to the measurement process.; Setting the Filter; Communication Commands; The following commands relate to external communications.
B n =<value><EOS> sets b 0 , b 1 , b 2 , or b 3 for the thermistor characterization. n is a number from 0 to 3. 7.3.2.2 Testing the Characterization The following command can be used to test the probe characterization: CO=<value><EOS> returns a temperature calculated from res...
Page 37 - Calibration Commands; The following commands are used in calibrating the instrument.; Entering the Password
7.3.4.1 Setting the Duplex Mode When the RS-232 duplex mode is set to FULL all commands received by the1504 from the RS-232 port are echoed back. Setting the mode to HALF dis-ables the echo. The duplex mode can be set remotely using the commands: DU=F<EOS> sets duplex to full DU=H<EOS> s...
Page 38 - Setting the Serial Number; Other Commands; Instrument Identification
7.3.5.4 Setting the Serial Number The following command is used to set the serial number of the 1504: *SN=<value><EOS> sets the instrument’s serial number 7.3.6 Other Commands Remaining commands are described below. 7.3.6.1 Instrument Identification The following command returns the mode...
Page 39 - Accessing the Calibration Parameters
8 Calibration Procedure The 1504 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 , 10 k Ω , and 100 k Ω . Three calibration pa- rameters determine the correction functi...
Page 42 - Troubleshooting
10 Troubleshooting In case you run into difficulty while operating the 1504, 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 R...
Page 43 - 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...
