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Thunder Scientific 5A-1MP Owner's Operation And Maintenance Manual

Electronic psychrometer relative humidity and temperature measurement system
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T H U N D E R S C I E N T I F I C C O R P O R AT I O N
MO DEL 5A-1 MP
E LE CTRO NIC P SYCHRO METER
RELATIVE HUMIDITY AND TEMPERATURE
MEASUREMENT SYSTEM
OPERATION AND
MAINTENANCE MANUAL
THUNDER SCIENTIFIC CORPORATION
623 WYOMING BLVD. S.E.
ALBUQUERQUE, NEW MEXICO 87123-3198

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  • Page 1 T H U N D E R S C I E N T I F I C C O R P O R AT I O N MO DEL 5A-1 MP E LE CTRO NIC P SYCHRO METER RELATIVE HUMIDITY AND TEMPERATURE MEASUREMENT SYSTEM OPERATION AND MAINTENANCE MANUAL THUNDER SCIENTIFIC CORPORATION 623 WYOMING BLVD. S.E. ALBUQUERQUE, NEW MEXICO 87123-3198...
  • Page 2 ELECTRONIC PSYCHROMETER MODEL 5A-1MP RELATIVE HUMIDITY AND TEMPERATURE MEASUREMENT SYSTEM OPERATION AND MAINTENANCE MANUAL THUNDER SCIENTIFIC CORPORATION 623 WYOMING BLVD. SE ALBUQUERQUE, NEW MEXICO 87123-3198 WWW.THUNDERSCIENTIFIC.COM...
  • Page 3 5A-1MP Laboratory Reference Psychrometer...

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Section 1 - GENERAL INFORMATION Warranty GENERAL DESCRIPTION................. 1-1 SPECIFICATIONS..................1-2 FEATURES....................1-2 Section 2 - INSTALLATION GENERAL....................2-1 ELECTRICAL..................... 2-1 COMPUTER/PRINTER INTERFACING............2-1 IEEE 488 INTERFACING (OPTIONAL)............ 2-3 Section 3 - OPERATION GENERAL....................3-1 STANDARD OPERATING PROCEDURES..........3-1 3.2.1 Power-up .....................
  • Page 5 Section 5 - RS-232 INTERFACE GENERAL....................5-1 RS-232 PROTOCOL ................... 5-1 INITIALIZING THE HOST TERMINAL OR COMPUTER......5-1 CLEARING THE 5A-1MP I/O BUFFERS............ 5-2 Section 6 - IEEE 488 INTERFACE GENERAL....................6-1 IEEE 488 ADDRESSING................6-1 CLEARING THE 5A-1MP BUFFERS ............6-1 Section 7 - IEEE 488/RS-232 COMMAND REFERENCE GENERAL....................
  • Page 6 WARRANTY Thunder Scientific Corporation warrants each instrument of its manufacture to be free from defect in materials and workmanship. The limit of liability under this warranty is to repair or replace any part thereof which shall within one year after delivery to the original purchaser, and returned by the original purchaser, prove to be defective after examination by Thunder Scientific Corporation.

  • Page 7: General Description

    RS-232 and IEEE 488 links through a series of more than 40 commands. The Model 5A-1MP is a precision laboratory grade instrument, and when operated and handled accordingly, will provide years of excellent service.

  • Page 8: Specifications

    SPECIFICATIONS Relative Humidity (RH) Measurement Range ..................1% to 100% RH Resolution 0.01% RH Guaranteed Accuracy ....................±1% RH Typical Accuracy ....................±0.5% RH Temperature Measurement Range ................0-100°C / 32-212°F Resolution 0.01°C and °F Guaranteed Accuracy .................. ±0.3°C / ±0.5°F Typical Accuracy ..................±0.1°C / ±0.2°F Data Interface Printer Interface ..................Centronics Parallel Computer Interface (standard)..............Bi-directional RS-232...

  • Page 9: Section 2 - Installation

    2.2) and may be connected to a printer and/or computer (Sections 2.2, 2.3, 2.4) for remote data collection and coefficient manipulation (also see Figures 2-1, 2-2, and 2-3). ELECTRICAL Using the 6' power cord provided, connect the 5A-1MP to a 115 VAC, 50/60 Hz, grounded outlet. COMPUTER/PRINTER INTERFACING The RS-232 computer interface shares a connector with the parallel printer interface (refer to Section 8.2 for the specific pinouts).
  • Page 10 (see Figure 2-2). Then plug the RS-232 cable into the unused connector on the printer cable. This connection scheme allows both the printer and computer to communicate with the 5A-1MP simultaneously. Small, Round Serial Cable...

  • Page 11: Ieee 488 Interfacing (Optional)

    IEEE 488 INTERFACING (OPTIONAL) The 5A-1MP may be connected to an IEEE 488 bus via its 24 pin D-type IEEE 488 connector located on the top panel above the computer/printer interface connector (see Figure 2-4). IEEE 488 communication with the 5A-1MP is discussed in Section 8. See Section 8.1 for wiring specifications.

  • Page 12: Section 3 - Operation

    : Due to the use of CMOS circuitry within the 5A-1MP, peripherals such as a printer may be supplying enough power to the 5A-1MP to prevent it from fully cycling down during a power-off sequence. This failure to fully cycle down may cause an invalid power-up sequence.

  • Page 13: Probe Preparation

    Place the probe in the environment to be tested and connect the white power signal cable. If multiple probes were calibrated with this 5A-1MP, ensure that the probe number and cable number match, as they were calibrated from the factory as a set. Connect the other end of the cable to the mating connector on the 5A-1MP.

  • Page 14: Probe # Selection

    3.2.4 Probe # Selection If the 5A-1MP has been supplied with more than one probe, the probe number which is currently connected to the system must be entered so that the appropriate calibration coefficients will be used in all mathematical calculations of Dry Bulb and Wet Bulb temperature.

  • Page 15: Entering The Flow Rate

    Convert the pressure to inches of mercury if required and enter it in the following manner; however, use the appropriate pressure. For example, to enter a pressure of 30.12 inches of mercury, press PRESS. LED's display RH on top, P--1 on bottom. Enables SET mode.

  • Page 16: Enabling/Disabling The Blower

    FLOW ENTER This number only remains valid until changed again from either the keypad, the IEEE 488, or the serial interface, or a cold reset is performed. (Refer to Section 3.2.1, Power-Up). Also, anytime the unit is aspirated by enabling the internal blower motor, the flow rate entered is ignored and all calculations are performed utilizing a preset flow rate determined during factory calibration.

  • Page 17: Displaying Desired Readings

    3.2.9 Displaying Desired Readings With the 5A-1MP in the normal parameter display mode, indicated by a "P" on the leftmost digit of the lower LED display, select the desired display parameter by pressing any of the numeric keys. The keys and associated parameters are listed below:...

  • Page 18: Changing The Time

    The blue text at the top of some of the keys indicates that when using the key, it is the parameter in blue which will be changed. (Refer to Sections 3.2.4-3.2.6, 3.2.10-3.2.14 for use of the SET key). Those keys without blue text have identical SET and DISPLAY parameters.

  • Page 19: Changing The Amount Of Averaging

    The 5A-1MP uses a weighted sum averaging technique where by the currently displayed value is multiplied by n, added to the new value, then the total is divided by n + 1.

  • Page 20: Switching Between °C And °F

    3.2.15 Switching Between °C and °F C / F The 5A-1MP powers up in °F mode. To switch to °C, press the key. The rightmost dot on the lower LED display will illuminate. Return to °F with the same key.

  • Page 21: Enabling The Auto Mode

    (illuminates the second dot) and controls the operation of the blower motor (the first dot). In AUTO mode operation, the 5A-1MP will automatically enable the blower exactly 60 seconds prior to each printout of data which occurs at the specified time interval.

  • Page 22: Section 4 - Maintenance

    Section 4 MAINTENANCE 4.1 PROBE WICK CHANGEOUT INSTRUCTIONS The CK-1 Wick Changeout Kit is provided to easily change wicks in the sensing probe. Wick changes should be performed after approximately 40 hours of operation, or more often, particularly if the instrument is in a dirty environment. A replacement wick supply should be kept on hand and can be ordered from the factory in advance of the need.

  • Page 23: Factory Certification And Recertification

    CONTAMINATED WATER, DO NOT FORCE. THIS WILL BREAK THE SENSOR LEADS, CAUSING EXPENSIVE REPAIR COSTS. IF ALCOHOL DOES NOT LOOSEN THE DEPOSIT, RETURN TO THUNDER SCIENTIFIC FOR REMOVAL. THUNDER SCIENTIFIC IS NOT RESPONSIBLE FOR LEAD BREAKAGE AND/OR SENSOR REPLACEMENT IF SUCH OCCURS.

  • Page 24: Nist Certification And Recertification

    In the case of NIST certification, it is recommended (although not required) that the instrument be sent to Thunder Scientific, so that NIST certification can be performed in conjunction with recommended annual factory calibration service.

  • Page 25: Section 5 - Rs-232 Interface

    For wiring/cabling instructions, refer to Section 2.3. RS-232 PROTOCOL All commands and data sent to and from the 5A-1MP are done so at the following factory preset parameters: Baud Rate: 1200 (Factory selectable from 300-9600)
  • Page 26 After computer or terminal initialization and prior to actual communications between the terminal or computer and the 5A-1MP, the data I/O buffers of the 5A-1MP should be cleared. To clear the I/O buffers from a terminal, send a Control C or ASCII Code 3 (ETX).

  • Page 27: Clearing The 5A-1Mp I/O Buffers

    The command in error is simply ignored. IEEE 488 ADDRESSING All 5A-1MP'S are initially set to an IEEE 488 address of 5 when originally shipped and during factory calibration/recalibration. The address is not hardware selectable, but is software selectable, and may be changed to any value between 0 and 9.
  • Page 28 5A-1MP, and additional characters are simply ignored. Note also that each command ends with either a questions mark (?), (when requesting data from the 5A-1MP), or an equal sign (=) followed by data (when sending data to the 5A- 1MP).
  • Page 29 Misc Control AUTO BLOWer DEGRees DISPlay RESEt RESTore SAVE Calibration Parameters DRYOhms WETOhms DZERo DSPAn DLINearity WZERo WSPAn WLINearity DOZEro DOSPan DOLInearity WOZEro WOSPan WOLInearity RS-232 Parameters ECHO IEEE 488 Parameters ADDRess...
  • Page 30 COMPLETE ALPHABETICAL COMMAND LISTING Command Parameters Description ADDRess IEEE 488 interface device selection address AUTO ON, OFF Set/Read AUTO mode status AVERage Numeric Set/Read amount of averaging BLOWer ON, OFF Set/Read blower motor status DATE mm/dd Set/Read date DEGRees C, F Set/Read temperature scale DISPlay Set/Read display parameter...
  • Page 31 ADDRess ADDR=n changes the address of the 5A-1MP on the IEEE 488 bus. (factory default = 5) When entering the address number n, only the first digit following the equal sign is checked, and must be between 0 and 9 inclusive. Any change of address is automatically stored in non-volatile memory.
  • Page 32 With AUTO mode enabled, the printer cannot be disabled by either the keypad or the PRINter command. Line 110 asks for the current auto mode status. The 5A-1MP responds with ON, followed by a carriage return. Line 120 accepts the word ON from the IBM serial input buffer.
  • Page 33 With AUTO mode enabled, the printer cannot be disabled by either the keypad or the PRINter command. Line 110 asks for the current AUTO mode status. The 5A-1MP interprets the command and waits with the ON response. Line 120 retrieves the response ON from the 5A-1MP.
  • Page 34 AVERage AVER=number sets internal averaging to the specified number. The power-up (power-up default=0) default value is 0, and reasonable values are between 0 (no averaging) and 100 (lots of averaging). Negative values should not be used. Both standard and scientific notation are accepted. AVER? returns the numeric value of the currently specified averaging amount.
  • Page 35 ________________________________________________________________________ IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "AVER = 5" !Set it to 5 directly. X = 4 This way works too, OUTPUT 705; "aver ="; X !and sets it to 4. OUTPUT 705; "AVERAGE - 1.080E1"!This makes it 10.8. OUTPUT 705;...
  • Page 36 (after about 1 second), and the leftmost dot on the lower LED display goes out. If AUTO mode is enabled, the blower will not turn off if the 5A-1MP is within 1 minute of printing a reading. With AUTO=ON and INTErvals get to 1 minute (00:01), the blower will not turn off at all and the BLOW=OFF command is ignored by the 5A-1MP.
  • Page 37 Line 1020 checks the status and ensures that if AUTO mode is ON, it is shut OFF by line 2000, along with the blower motor. Line 1030 shuts the BLOWer motor OFF, only if AUTO mode is OFF. TERMINAL Example (assuming ECHO is ON): BLOWER? This is the power-up default.
  • Page 38 Line 200 sets the date using the Date function of BASICA. The date$ function gives the date as mm/dd/yyyy, but the 5A-1MP uses only the mm/dd portion of the string. Lines 210-230 retrieve the new 5A-1MP date and display it alongside the IBM date. The monitor shows (as an example)
  • Page 39 DATE=07/04/1776 Independence Day. DATE? 07/04 Always ignores the year. IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "DATE?" !Ask for Date. ENTER 705; D$ !Read it in. DISP D$ !Display on computer screen. OUTPUT 705; "DATE = 12-31; TIME = 23:59:59" !Happy New Year! ________________________________________________________________________ RELATED COMMANDS: TIME...
  • Page 40 C, regardless of the setting of the DEGR command. The DEGR command affects only the LED display and printer. IBM BASICA Example (assuming com1 is initialized and 5A-1MP ECHO is OFF ): PRINT #1, "DEGR=C" 'Put printer/display in °C.
  • Page 41 IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "DEGREES = F" !Put printer/disp in •F. OUTPUT 705; "DEGR = C?" !Change and verify in same command. ENTER 705: A$ !Read in "F". DISP A$ !Displays F. 7-14...
  • Page 42 (0-9) which corresponds to the currently displaying parameter. (See parameter list above). IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "DISP=1" 'Display RH on upper LED, P--1 on lower LED.
  • Page 43 Line 230 increments the display to the next number. The MOD(10) causes 9+1 to equal 0 rather than 10. TERMINAL Example (assuming ECHO is ON): DISP? Power-on default value, the time. DISPLAY=8 Show date on LED display. DISP=2 Show Dewpoint temperature on LED display. DISP? Verify.
  • Page 44 DLIN? returns the LINEARITY coefficient of the Dry Bulb temperature formula of the currently selected probe. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "DLIN?" 'Read current value. INPUT #1, A$ OLD.NUM=VAL(A$)
  • Page 45 ENTER 705; X DISP X !Display it. RELATED COMMANDS: DSPAn DZERo PROBE RESTore SAVE 7-18...
  • Page 46 RESTore and SAVE commands to alter non-volatile memory. DOLI? returns the LINEARITY coefficient of the Dry Bulb ohms formula. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "DOLI?" 'Read current value. INPUT #1, A$ OLD.OHM.LIN=VAL (A$) 'Convert to numeric.
  • Page 47 ________________________________________________________________________ RELATED COMMANDS: DOSPan DOZEro RESTore SAVE 7-20...
  • Page 48 DOSPan (Dry Ohms Span Coefficient) DOSP=number is used during factory calibration only, and temporarily changes the SPAN coefficient of the Dry Bulb ohms formula. (Refer to DOLI command). DOSP? returns the SPAN coefficient of the Dry Bulb ohms formula. IBM BASICA Example (Refer to DOLI command). TERMINAL Example (Refer to DOLI command).
  • Page 49 DOZEro (Dry Ohms Zero Coefficient) DOZE=number is used during factory calibration only, and temporarily changes the ZERO coefficient of the Dry Bulb ohms formula. (Refer to DOLI command). DOZE? returns the ZERO coefficient of the Dry Bulb ohms formula. IBM BASICA Example (Refer to DOLI command). TERMINAL Example (Refer to DOLI command).
  • Page 50 All temperatures are returned in degrees C only regardless of the status returned by the DEGR? command. Temperatures are also returned in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): A$="DP?" 'Want dewpoint. GOSUB 200 'Go request it.
  • Page 51 Saturation Vapor Pressure in inches of mercury. All saturation vapor pressures are returned in inches of mercury in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "DPSV?" 'Request DP SVP value.
  • Page 52 All ohms values are returned in 8 digit scientific notation. Values returned should be between 440 and 690 Ω. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "DRYO?" 'Request value. INPUT #1, A$ 'Read it in.
  • Page 53 DRYSvp (Dry Bulb Saturation Vapor Pressure) DRYS? returns the current Saturation Vapor Pressure at the Dry Bulb temperature in inches of mercury. All saturation vapor pressures are returned in inches of mercury in 8 digit scientific notation. IBM BASICA Example (Refer to DPSV command). TERMINAL Example (Refer to DPSV command).
  • Page 54 DRYTemp (Dry Bulb Temperature) DRYT? returns the current Dry Bulb temperature. All temperatures are returned in degrees centigrade, in 8 digit scientific notation. IBM BASICA Example (Refer to DP command). TERMINAL Example (Refer to DP command). ________________________________________________________________________ IEEE 488 Example (Refer to DP command). 7-27...
  • Page 55 DSPAn (Dry Bulb Span Coefficient) DSPA=number is used during factory calibration, and temporarily changes the SPAN coefficient of the Dry Bulb temperature formula. The number stored is valid until power is removed, the RESET=C command is used, the PROBe command is used, the probe number is set or changed from the keypad, or a cold reset is executed from the keypad.
  • Page 56 DZERo (Dry Bulb Zero Coefficient) DZER=number is used during factory calibration, and temporarily changes the SPAN coefficient of the Dry Bulb temperature formula. The number stored is valid until power is removed, the RESET=C command is used, the PROB=n command is used, the probe number is set or changed form the keypad, or a cold reset is executed from the keypad.
  • Page 57 ON or OFF, depending on the status. If ECHO is ON, a line feed character is also sent following ON «CR». IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): OPEN "COM1"9600,n,8,2,cs,cd,ds,rs" as #1 'Init com port.
  • Page 58 TERMINAL Example (assuming ECHO is ON): ECHO? Power-on default mode. ECHO=OFF Turn it off. ›››› Information is overwritten because no line feeds. Executing ECHO=ON restores normal operation. 7-31...
  • Page 59 Note: Refer to RESTore and SAVE commands to alter the default in non-volatile memory. ENDL? returns C, L, CL, or LC, depending on the present setting. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1 "ENDLINE?" 'Get present setting. INPUT #1, A$ 'A$="C", "L", "CL", or "LC".
  • Page 60 IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "ENDL?" !Get present setting. ENTER 705; A$ !A$ = "C", "L", "CL", or "LC". OUTPUT 705; "ENDLINE = CL" !Sends carriage return - linefeed after each printed line. ______________________________________________________________________________________ RELATED COMMANDS: PRINt RESTore SAVE...
  • Page 61 The number returned is in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1 "AUTO=OFF" 'Ensures auto and blower are off.
  • Page 62 1.0000000E+02 OK, it's 100 SLPM. AUTO? Make sure auto and blower are OFF. BLOW? If it's on, then let's turn it OFF. BLOW=OFF Now 100 SLPM will be used in RH calcs. IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705;...
  • Page 63 (Refer to HEADer command). FORM? returns either ON or OFF, depending on the present status. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "FORM=OF" 'Only need first 2 letters in "OFF". PRINT #1, "FORM?"...
  • Page 64 ENTER 705; A$ !A$ = "ON" or "OFF". DISP "Formfeeds are "; A$ !Display status on screen. OUTPUT 705; "FORM = ON; HEAD=ON" !Turn form feeds ON, turn header ON. ________________________________________________________________________ RELATED COMMANDS: HEADer PRINt RESTore SAVE 7-37...
  • Page 65 HEADer HEAD=ON causes the printer to print a column heading at the top of each (factory default) page. If FORM=OFF has been executed, the header may occur anywhere on the page since the printer is not advancing to the top of each new page. With HEADer enabled, a new header is also printed each time the printer is re-enabled from either the keypad or the PRINt =ON command.
  • Page 66 It is returned in the format hh:mm where hh is in hours and mm is in minutes. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "INTERVAL=00:05" 'Set print interval to 5 minutes.
  • Page 67 ________________________________________________________________________ RELATED COMMANDS: AUTO PRINt 7-40...
  • Page 68 The number returned is an integer in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "LINE?" 'Get # of lines per page.
  • Page 69 ________________________________________________________________________ RELATED COMMANDS: FORMfeed HEADer PRINt RESTore SAVE 7-42...
  • Page 70 It is returned in inches of mercury in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): INPUT "WHAT IS THE CURRENT BARO 'Get current pressure from operator.
  • Page 71 ________________________________________________________________________ RELATED COMMANDS: RESTore SAVE 7-44...
  • Page 72 PRIN? returns either ON or OFF, depending on the current status. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "PRINT=NOW" 'Print once immediately. PRINT #1, "PRIN=ON"...
  • Page 73 PRIN=OFF Try turning it off. PRINT? Verify. Can't do it with auto ON. AUTO=OFF Disable auto. PRIN? Check. AUTO=OFF disables printer, too. IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "PRINT = NOW" !Print 1 line now. OUTPUT 705; "PRINTER?" !Get status.
  • Page 74 PROB? returns 1, 2, 3, or 4, depending on which probe has been set as active. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): INPUT "PLEASE INSTALL PROBE 3. 'Prompt a change. HIT ENTER WHEN READY", A$ PRINT #1, "PROB=3"...
  • Page 75 IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "PROBE?" !Get probe #. ENTER 705; Pn DISP "5A-1MP IS SET TO PROBE #"; Pn !Display it. INPUT "WHICH PROBE IS INSTALLED?", Pn !Ask user which one. OUTPUT 705; "PROBE = "; Pn !Tell 5A-1MP.
  • Page 76 All parameters are restored to their power-up default conditions, and communications buffers are cleared. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): 1000 PRINT #1, "RESET=COLD" 'Restore default parameters (including ECHO=ON).
  • Page 77 End of Line = Carriage return only Lines/page = 60 Pressure restores to 29.92 "Hg IEEE 488 Address restores to 5. ________________________________________________________________________ IBM BASICA Example (assuming COM1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "REST=5A1MP" 'Purge memory, restore pre-calibration coefficients, etc.
  • Page 78 ________________________________________________________________________ IEEE 488 Example (HP Rocky Mountain BASIC syntax): OUTPUT 705; "REST=5A1MP" !Purge memory, restore pre-cal coefficients, etc. ______________________________________________________________________________________ RELATED COMMANDS: SAVE 7-51...
  • Page 79 (Refer to PRESsure and FLOW commands). Relative humidity is returned in 8 digit scientific notation. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "RH?" 'Get RH. INPUT #1, A$ PRINT "RELATIVE HUMIDITY IS ";A$;"%"...
  • Page 80 (see PROBe command). The password, 5A1MP, is required in order to prevent accidental alteration of non- volatile memory. ________________________________________________________________________ IBM BASICA Example (assuming COM1 initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "PROB=1" 'Set Probe 1 PRINT #1, "DZERO?"...
  • Page 81 ________________________________________________________________________ AFFECTED COMMANDS: DOZEro DOSPan DOLInearity WOZEro WOSPan WOLInearity DZERo DSPAn DLINearity WZERo WSPAn WLINearity HEADer FORMfeeds ENDLine LINEs PRESsure 7-54...
  • Page 82 BASIC. Note that seconds are optional and will default to:00 if not specified. TIME? returns the time in hh:mm:ss format. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "TIME="; TIME$ 'Synchronize to IBM clock. PRINT #1, "TIME?"...
  • Page 83 ________________________________________________________________________ RELATED COMMANDS: DATE 7-56...
  • Page 84 Wet Bulb in ohms. All ohms values are returned in 8 digit scientific notation. Values should be between 440 and 690 Ω. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "WETO?" 'Request value.
  • Page 85 WETSvp (Wet Bulb Saturation Vapor Pressure) WETS? returns the current Saturation Vapor Pressure at the Wet Bulb temperature, in inches of mercury. All saturation vapor pressures are returned in inches of mercury in 8 digit scientific notation. IBM BASICA Example (Refer to DPSV command). TERMINAL Example (Refer to DPSV command).
  • Page 86 WETTemp (Wet Bulb Temperature) WETT? returns the current Wet Bulb temperature. All temperatures are returned in degrees centigrade, in 8 digit scientific notation. IBM BASICA Example (Refer to DP command). TERMINAL Example (Refer to DP command). ________________________________________________________________________ IEEE 488 Example (Refer to DP command). 7-59...
  • Page 87 RESTore and SAVE commands to alter non-volatile memory. WLIN? returns the LINEARITY coefficient of the Wet Bulb temperature formula of the currently selected probe. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "WLIN?" 'Read current value. INPUT #1, A$ OLD.NUM=VAL(A$)
  • Page 88 OUTPUT 705; "WLINEARITY?" !Get value. ENTER 705; x L = .000087654321 !Change value. OUTPUT 705; "WLIN="; L ________________________________________________________________________ RELATED COMMANDS: WSPAn WZERo PROBe RESTore SAVE 7-61...
  • Page 89 Refer to the RESTore and SAVE commands to alter non- volatile memory. WOLI? returns the LINEARITY coefficient of the Wet Bulb ohms formula. IBM BASICA Example (assuming com1 is initialized to #1 and 5A-1MP ECHO is OFF): PRINT #1, "WOLI?" 'Read current value. INPUT #1, A$ OLD.OHM.LIN=VAL (A$) PRINT #1, "WOLI=7.7827037E-5?"...
  • Page 90 ENTER 705; W3 ________________________________________________________________________ RELATED COMMANDS: WOSPan WOZEro RESTore SAVE 7-63...
  • Page 91 WOSPan (Wet Ohms Span Coefficient) WOSP=number is used during factory calibration only, and temporarily changes the SPAN coefficient of the Wet Bulb ohms formula. (Refer to WOLI command). WOSP? returns the SPAN coefficient of the Wet Bulb ohms formula. IBM BASICA Example (Refer to WOLI command). TERMINAL Example (Refer to WOLI command).
  • Page 92 WOZEro (Wet Ohms Zero Coefficient) WOZE=number is used during factory calibration only, and temporarily changes the ZERO coefficient of the Wet Bulb ohms formula. (Refer to WOLI command). WOZE? returns the ZERO coefficient of the Wet Bulb ohms formula. IBM BASICA Example (Refer to WOLI command). TERMINAL Example (Refer to WOLI command).
  • Page 93 WSPAn (Wet Bulb Span Coefficient) WSPA=number is used during factory calibration, and temporarily changes the SPAN coefficient of the Wet Bulb temperature formula. The number stored is valid until power is removed, the RESET=C command is used, the PROB=n command is used, the probe number is set or changed from the keypad, or a cold reset is executed from the keypad.
  • Page 94 WZERo (Wet Bulb Zero Coefficient) WZER=number is used during factory calibration, and temporarily changes the ZERO coefficient of the Wet Bulb temperature formula. The number stored is valid until power is removed, the RESET=C command is used, the PROB=n command is used, the probe number is set or changed from the keypad, or a cold reset is executed from the keypad.
  • Page 95 The connection for the RS-232 communications port and the Centronics parallel printer port are combined into a single DB25 connector on the 5A-1MP instrument panel. Although this connector has the appearance of a standard RS-232C receptacle, it is not wired in an RS-232 format.
  • Page 96 IEEE 488 CONNECTOR The IEEE 488 interface uses a standard IEEE 488 cable to connect the 5A-1MP to a computer. The following is a list of the connector pins and their functions. IEEE 488 CONNECTOR FUNCTION DIO1 DIO2 DIO3 DIO4...

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