TT1200 Turbine Temperature Test Set
Contents
1. increments Range 0 199 9 MO in 100K ohm increments 2 Accuracy 5 of reading 2 counts 3 Excitation 45V DC nominal 56 101 00920 D CH 3 Nov 7 14 Page 12 of 14 i BARFIELD TT1200 User Manual D Simulated System Resistance 1 Adjustment Range Less than 2 0 ohms to greater than 25 ohms 2 Fixed Setting Less than 0 1 ohm 3 CAPABILITIES A Measures and displays resistance of thermocouples thermocouple rings and system lead circuits B Measures and displays insulation resistance of system wiring and other components C Simulates CH AL thermocouples with or without simulated system lead resistance D Measures and displays values of CH AL thermocouples in terms of degrees Celsius C temperature E Automatically compensates for ambient temperature at test lead connection junction point or indicates this cold junction temperature 56 101 00920 D CH 3 Nov 7 14 Page 13 of 14 i BARFIELD TT1200 User Manual CHAPTER 4 RECEIVING SHIPPING AND STORAGE 1 RECEIVING No special unpacking procedures are necessary It is recommended that factory shipping container and packing materials be retained should it become necessary for any reason to reship the Test Set It is also recommended that the Test Set be carefully inspected for damage If damaged immediately notify both the carrier and manufacturer 2 SHIPPING Use standard delicate electronic equipment packaging procedures when pac2. CD which provides all the readings with associated units and legends for low battery warning BAT and an open thermocouple circuit OPEN H Two battery holders 8 house 4 each AA alkaline cells which provide power for all test set functions The TEMP ADJ control knob 9 a 10 turn potentiometer permits coarse adjustment of the temperature or millivoltage while the FINE control 10 provides exact adjustment of the readings which are displayed on the LCD when the FUNCTION switch is in the IND TEST position J The C MV toggle switch 11 allows the user to configure the test set to display either C or millivoltage when the FUNCTION switch is set to IND TEST or TEMP MEAS positions The center position MV amb_ient comp_ensated provides the operator with a millivoltage display that is based on a reference junction at 0 C The lower position MV may be thought of as a DVM function and provides the user with a display equivalent to having a DVM connected in parallel at the test set s Red and Black clips K The FUNCTION switch 12 a 4 position rotary switch that permits selection of the four principal test functions RESistance MEASure INSulation MEASure INDicator TEST and TEMPerature MEASure m The 1 C 1 C toggle switch 13 allows the user to set the test set s display resolution when the FUNCTION switch is set to IND TEST or TEMP MEAS and C is selected 4 RECERTIFICATION The Test Set P N 101 00920 has a one year r
3. F CONTENTS Contact Information Attention Page Revision Record Maintenance and Repair Information Table of Contents i BARFIELD PAGE CHAPTER 1 GENERAL INFORMATION 1 Purpose of Manual cccccccccccseccecssceeeeeeeeseneeccaeeeseneeeseneescaeeeseaeesseneessaeeeseaeesseeeeesueeeseneeess 1 2 General Description of the Test Set cccccccccccesseeeeneeceeeaeeeeeneeseneeeseaeeeseaeeseeeeessneeeseaeeeas 1 3 Switching Functions sa ca secesecevscacsccescecncecadecacecaceracucezauceiewicieaueeutecensceaccensecancensactecedecnieesccanictaate 2 Ai RECOMIPCATION sisiscstsnstinatinvssniticevscavastinasagasd sa arsubateseesteeeeirbebei eves aE EEEE Eae aar raua aana 4 CHAPTER 2 OPERATION 1 General Operating Instructions ccccsceseceecceessensecesseeeseneseeenseeasseeseensnenaneneseeeeseenenenss 5 2 System Lead Resistance Measurement 2 ccscccecceseceeseeeseeeseeeeseeeseeesneeneeenseeneeneeeeeees 6 3 Thermocouple Resistance Test ProCeCure cccccecssceeseneeeeeeeeeeaeeeesneeeseeeseeeeseneeeenees 7 4 Insulation Testing Procedure a ciiciusncicincsincscrdnuedaiedaondtamesanictuetinctinatenibeunshaastdasattaadeandeaactsantaads 8 5 Indicator Test Procedure With Specified Lead Resistance cccscccseseeeeseeeeseeeees 8 6 Potentiometric or Servoed Indicator Test Procedure Without Lead Resistance 9 7 Temperature Measurement Test Procedure cccccceeeseeseceeee
4. ON AIRCRAFT INDICATORS OF THE D ARSONVAL TYPE MUST NOT BE CONNECTED DURING THIS TEST D ARSONVAL INDICATORS MAY GENERALLY BE RECOGNIZED BY THE ABSENCE OF A MULTI PIN CONNECTOR AND WILL USUALLY HAVE TWO TERMINAL POSTS OR TERMINAL SCREWS E Connect test lead clips to thermocouple leads OBSERVING POLARITY Alumel is negative and connects to the TT1200 BLACK clip Chromel is positive and connects to the TT1200 RED clip F Display will indicate thermocouple temperature directly in C NOTE If the word OPEN is displayed there is an open circuit in the thermocouple or lead wires 56 101 00920 D CH 2 Nov 7 14 Page 11 of 14 i BARFIELD TT1200 User Manual CHAPTER 3 SPECIFICATIONS AND CAPABILITIES 1 PHYSICAL DATA A Height 6 5 in 16 5 cm B Width 9 3 in 23 6 cm C Depth 7 0in 17 8 cm D Weight 5 4 lbs 2 4 kg 2 SPECIFICATIONS A Temperature Measurement 1 Type K CH AL Thermocouple 2 Range 0 to 1200 C certified 50 to 1250 C extended 3 Accuracy Typical measurement error at 25 C ambient less than 0 3 C B Lead Resistance 1 Range 0 19 999 ohms in 0 001 ohm increments Range 0 199 99 ohms in 0 01 ohm increments Range 0 1 9999 K ohms in 0 1 ohm increments Range 0 19 999 K ohms in 1 ohm increments 2 Accuracy 0 05 of reading 2 counts C Insulation 1 Range 0 199 9 ka in 0 1K ohm increments Range 0 1 999 MQ in 1K ohm increments Range 0 19 99 MQ in 10K ohm
5. e leads from system temperature indicator B Carefully connect test lead clips to each of the lead wires insuring a good electrical connection C Set the FUNCTION switch to RES MEAS D Set the RANGE switch to 200 ohm E Setting of 1 C 1 C switch is immaterial F Setting of C MV switch is immaterial G Place ON OFF switch to ON and depress the PTM pushbutton switch H Display will indicate resistance in ohms to within 0 01 ohm Ifa1_ ___is displayed resistance is greater than 199 99 ohms or there is an open circuit 56 101 00920 D CH 2 Nov 7 14 Page 6 of 14 i BARFIELD TT1200 User Manual I Interchange RED and BLACK test clip connections and the display should repeat when the PTM pushbutton is depressed If the reading does not repeat the engine thermocouples may be hot Ref Para 1 D above NOTE Resistance must be within manufacturer s specifications If results are slightly outside limits repeat entire procedure to insure test failure is not due to human error J Place ON OFF switch to OFF disconnect the TT1200 and return aircraft to original configuration 3 THERMOCOUPLE RESISTANCE TEST PROCEDURE A Disconnect thermocouple leads from system temperature indicator B Carefully connect test lead clips to each of the lead wires insuring a good electrical connection C Set the FUNCTION switch to RES MEAS D Setthe RANGE switch to 200 ohm E Setting of 1 C 1 C switch is immaterial F S
6. ecertification requirement Maintenance required by this unit must be performed by qualified technicians in a shop equipped with the necessary tooling and facilities 56 101 00920 D CH 1 Nov 7 14 Page 4 of 14 i BARFIELD TT1200 User Manual CHAPTER 2 OPERATION 1 GENERAL OPERATING INSTRUCTIONS Consult temperature indicator system and or engine manufacturer s instructions for procedures and specifications Read complete TT1200 Operation procedures before attempting to use the TT1200 A Protective Circuits 1 Although the TT1200 has input protection the test set should never be connected to an energized circuit B Preparation For Use 1 Battery Installation Replacement a Using a coin or screwdriver remove the covers from the battery holders located in the upper right corner of the panel Invert the TT1200 so that batteries slide out With the TT1200 upright insert two AA alkaline batteries into each holder with the negative terminals down for all b To check the 4 AA batteries set the FUNCTION switch to RES MEAS the RANGE switch to 20 ohm position and short test lead clips together c Depress the PTM pushbutton switch If BAT is displayed replace the batteries as detailed above C Precautions 1 Do NOT press either pushbutton with test clips connected to the aircraft indicator The current applied may damage the indicator 2 Do NOT connect test clips to an energized circuit Although the TT1200 is
7. eeeseeeeeeneeseeeeessneeeesneeess 11 CHAPTER 3 SPECIFICATIONS AND CAPABILITIES 1e Physical Data sna tecascectseqtacetsactnsticalccalsstuaesatickatntatsseasdtububalsabetasebebebanetadetasetadebetabetebetenotanctalecney 12 2 Specifications ee eeeccceccccceneeeceneeceeeeesaeeeeseaeeeeeeeeseaeeeseaeeeseeeeseaeesseaeesseeeseaeesseaeessieeeeeaeeess 12 3 Capabilities eee 13 CHAPTER 4 RECEIVING SHIPPING AND STORAGE 1 ROCCIVIING EET A E 14 2 SNPPIN e a a ene 14 BUN e 14 56 101 00920 D TOC Nov 7 14 Page vii i BARFIELD TT1200 User Manual This page intentionally left blank 56 101 00920 D Blank Nov 7 14 Page viii i BARFIELD TT1200 User Manual CHAPTER 1 GENERAL INFORMATION 1 PURPOSE OF MANUAL A This publication contains the description and the operating procedures for the TT1200 DIGITAL TURBINE TEMPERATURE TEST SET P N 101 00920 Fig 1 Manufactured by BARFIELD INC 4101 NW 29th Street Miami Florida 33142 USA B This manual is developed to address the above Test Set especially designed to test and calibrate Chromel Alumel CH AL temperature indicating systems It contains complete instructions for maintenance inspection testing troubleshooting and calibration of systems installed on aircraft engines 2 GENERAL DESCRIPTION OF THE TEST SET The TT1200 provides the means for quickly troubleshooting aircraft temperature indicating systems It has sufficient sensitivity and accuracy to test thermocoup
8. etting of C MV switch is immaterial G Place ON OFF switch to ON and depress the PTM pushbutton switch H Display will indicate resistance in ohms to within 0 01 ohm Ifa1__ __ is displayed resistance is greater than 199 99 ohms or there is an open circuit I Interchange RED and BLACK test clip connections and the display should repeat when the PTM pushbutton is depressed If the reading does not repeat the engine thermocouples may be hot Ref Para 1 D above NOTE Resistance must be within manufacturer s specifications If results are slightly outside limits repeat entire procedure to insure test failure is not due to human error J Place ON OFF switch to OFF disconnect the TT1200 and return aircraft to original configuration 56 101 00920 D CH 2 Nov 7 14 Page 7 of 14 i BARFIELD TT1200 User Manual 4 INSULATION TESTING PROCEDURE A 9 o m Disconnect one or both leads at system temperature indicator Then connect the BLACK lead clip to ground and the RED lead clip to one or both thermocouple system lead wires Ref engine manufacturers Maintenance Manual for specific hookup Set the FUNCTION switch to INS MEAS Set the RANGE switch to 2M ohm or as desired Setting of 1 C 1 C switch is immaterial Setting of C MV switch is immaterial Place ON OFF switch to ON and depress the PTM pushbutton switch Display will indicate insulation resistance in 1 000 000 s of ohms megohms fa 1 is dis
9. is publication the TT1200 and the aircraft system before performing any test or checks 3 SWITCHING FUNCTIONS Ref Fig 1 A B The ON OFF toggle switch 1 applies power for all functions The RANGE switch 2 a 4 position rotary switch permits selection of the resistance and insulation ranges 200 2002 2KQ and 20KQ for RES MEAS or 200KQ 2Ma 20MQ and 200MQ for INS MEAS The fourth position is also used for 0 ohm system resistance for the IND TEST function The PTM Press To Measure pushbutton 3 when depressed activates the TT1200 excitation and measuring circuitry when the FUNCTION switch is set to the RES MEAS or INS MEAS positions The PTS Press To Set pushbutton 4 when depressed with test leads shorted and the FUNCTION switch in the RES MEAS position connects the SYS RES potentiometer for system resistance adjustment The SYStem RESistance control knob 5 a 10 turn potentiometer used to adjust system lead resistance 2 to 25 ohms when test leads are shorted and the PTS pushbutton is depressed The TEST connector 6 provides the means for connecting the TT1200 s standard leads or specifically designed interface cabling 56 101 00920 D CH 1 Nov 7 14 Page 2 of 14 i BARFIELD TT1200 User Manual 6 WBARFIELD TT1200 FRONT PANEL LAYOUT Figure 1 56 101 00920 D CH 1 Nov 7 14 Page 3 of 14 i BARFIELD TT1200 User Manual G The display 7 is a 4 1 2 digit L
10. king the Test Set for reshipment 3 STORAGE Store in a cool dry place 56 101 00920 D CH 4 Nov 7 14 Page 14 of 14
11. le and system resistance insulation and indicator calibration It features portability simplicity of operation direct reading and multi function versatility A 111200 Features 1 2 4 Specifically designed to meet all requirements for testing aircraft Chromel Alumel CH AL temperature measuring systems and provides an accurate display of thermocouple outputs in degrees Celsius C Thermocouple and lead resistance measurements to 0 001 ohm and insulation measurements up to 200 megohms Simulates thermocouple outputs and system lead resistances from 2 to 25 ohms Completely self contained self monitoring easily portable temperature and resistance measuring and simulating device for all CH AL systems with the capability to bench test indicators 56 101 00920 D CH 1 Nov 7 14 Page 1 of 14 i BARFIELD TT1200 User Manual 5 Human engineered for maximum ease of operation and maintenance with state of the art low battery drain circuitry with automatic ambient test point temperature correction 6 A large 9mm 0 35 high characters 4 1 2 digit Liquid Crystal Display LCD with pre programmed legends 7 Carrying Case features a Fabricated from high impact plastic b Provides a pouch on the rear for test lead storage c The lid contains a placard of abridged operating instructions for the experienced technician NOTE For nonexperienced personnel it is advisable to become familiar with th
12. nfiguration 6 POTENTIOMETRIC OR SERVOED TYPE INDICATOR TEST PROCEDURE Without Lead Resistance A General 1 The Potentiometric or Servoed indicator as it is generally referred to may be recognized by its multiple pin electrical connector and the requirement of aircraft electrical power to operate 2 Thermocouple lead resistance is not critical with this type of indicator and usually need not be measured B System Lead Resistance Measurement 1 Disconnect aircraft power to indicator Ref Maintenance Manual 2 Disconnect electrical connector at rear of indicator 3 Connect TT1200 leads to probe pins sized to fit chromel and alumel pin sockets of aircraft plug removed from indicator 4 Follow Para 2 System Lead Resistance Test Procedure steps C through H above NOTE Lead resistance is not critical generally in the order of 5 to 100 ohms Ref Maintenance Manual for specific values 56 101 00920 D CH 2 Nov 7 14 Page 9 of 14 t BARFIELD TT1200 User Manual C Thermocouple Resistance Measurement 1 Disconnect aircraft power to indicator Ref Maintenance Manual 2 Follow Para 3 Thermocouple Resistance Test Procedure above D Insulation Testing 1 Disconnect aircraft power to indicator Ref Maintenance Manual 2 Disconnect electrical connector at rear of indicator 3 Follow Para 4 Insulation Testing Procedure steps B thru F above using probe pins at aircraft plug or make connection at e
13. ngine thermocouple terminal blocks E Indicator Test 1 Disconnect aircraft power to indicator Ref Maintenance Manual 2 Disconnect leads from indicator at engine thermocouple terminal block 3 Set the FUNCTION switch to IND TEST 4 Set the RANGE switch to 20 K ohm 0 2 SYS RES 5 Set 1 C 1 C switch as desired 6 Set C MV switch to C or as desired 7 Connect test lead clips to indicator leads OBSERVING POLARITY Alumel is negative and connects to the TT1200 BLACK clip Chromel is positive and connects to the TT1200 RED clip 8 Place aircraft temperature indicating system power to ON 9 Place ON OFF switch to ON 10 Rotate the TEMP ADJ control for desired test points as read on the TT1200 digital display It may be necessary to use the FINE control to achieve the exact settings 11 Compare readings of indicator under test with TT1200 indications NOTE Indicator must agree with TT1200 reading to within manufacturer s specifications 56 101 00920 D CH 2 Nov 7 14 Page 10 of 14 t BARFIELD TT1200 User Manual 12 Place aircraft temperature indicating system power to OFF 13 Place ON OFF switch to OFF disconnect the TT1200 and return aircraft to original configuration 7 TEMPERATURE MEASUREMENT TEST PROCEDURE A Set the FUNCTION switch to TEMP MEAS B Set the RANGE switch to 20 K ohm 0 2 SYS RES C Set 1 C 1 C switch as desired D Set C MV switch to C or as desired CAUTI
14. played resistance is greater than 1 999 megohms or there is an open circuit NOTE Resistance to ground must not be less than manufacturer s specifications Place ON OFF switch to OFF disconnect the TT1200 and return aircraft to original configuration 5 INDICATOR TEST PROCEDURE With Specified Lead Resistance A Set the FUNCTION switch to RES MEAS B Set the RANGE switch to 200 ohm C Place ON OFF switch to ON D Short test lead clips together and depress the PTS pushbutton while adjusting SYS RES control knob for displayed system resistance to be simulated E Set the FUNCTION switch to IND TEST F Set 1 C 1 C switch as desired G Set C MV switch to C or as desired H Disconnect aircraft thermocouple leads from temperature indicator 56 101 00920 D CH 2 Nov 7 14 Page 8 of 14 i BARFIELD TT1200 User Manual 1 Connect test lead clips to indicator terminals OBSERVING POLARITY Alumel is negative and connects to the TT1200 BLACK clip Chromel is positive and connects to the TT1200 RED clip J Set TEMP ADJ control for the desired test temperature as displayed on the digital indicator It may be necessary to use the FINE control to achieve the exact settings K Compare readings of indicator under test with TT 1200 indications NOTE Indicator must agree with TT1200 reading to within manufacturers specifications L Place ON OFF switch to OFF disconnect the TT1200 and return aircraft to original co
15. provided with protective devices not all damaging potentials can be made completely safe 3 Allow sufficient time for test clips to stabilize to the temperature of the terminals to which they are connected for temperature tests 4 Measure system and thermocouple resistance with a cold engine for greatest accuracy 56 101 00920 D CH 2 Nov 7 14 Page 5 of 14 i BARFIELD TT1200 User Manual 5 To conserve battery power place ON OFF switch to OFF when the test set is not in use 6 BAT warning displayed indicates about 10 battery life of the batteries remain and they should be replaced D Hot Engine Testing A hot engine will cause thermocouples to generate a small potential which will produce errors in measured resistance values This effect is inherent in any type resistance measuring instrument The effect can be circumvented by taking two measurements the first with test leads connected in one polarity and then reversing the lead connections for the second measurement The true value is equal to the average of the two readings i e add the two readings and divide by two The two readings must be taken in quick succession so that the thermocouple temperature will be the same for both readings If the thermocouples are too hot the readings will be too far from nominal to provide sufficient accuracy In such a case wait for the engine to cool further 2 SYSTEM LEAD RESISTANCE TEST PROCEDURE A Disconnect thermocoupl
16. t BARFIELD 711200 Turbine Temperature Test Set USER INSTRUCTION MANUAL BARFIELD M N TT1200 56 101 00920 Revision D November 7 2014 BARFIELD INC Corporate Headquarters 4101 Northwest 29th Street Miami Florida 33142 www barfieldinc com Email gsesales barfieldinc com Copyright 2014 Barfield Inc All Rights Reserved i BARFIELD TT1200 User Manual CONTACT INFORMATION Users are requested to notify the manufacturer of any discrepancy omission or error found in this manual Inquiries should include specific questions and reference the publication title number chapter page figure paragraph and effective date 56 101 00920 D Nov 7 14 Please send comments to TECHNICAL CUSTOMER SUPPORT GSTE BARFIELD INC P O BOX 025367 MIAMI FL 33102 5367 USA Telephone 305 894 5400 800 321 1039 Fax 305 894 5401 Email gsesales barfieldinc com Contact Page ii i BARFIELD TT1200 User Manual ATTENTION Although every effort has been made to provide the end user of this equipment with the most current and accurate information it may be necessary to revise this manual in the future Please be sure to complete and return the enclosed OWNER WARRANTY REGISTRATION CARD to Barfield in order to validate the warranty and to ensure that you will receive updated information when published You MUST have your name and address on file at Barfield as a registered user of this equipment to be able to ob
17. tain the service covered by the warranty Visit the company website http barfieldinc com for publication updates Please send the Registration Card to Barfield Inc P O Box 025367 Miami FL 33102 5367 USA 56 101 00920 D Attention Nov 7 14 Page iii i BARFIELD TT1200 User Manual REVISION RECORD REV ECO REV DATE DESCRIPTION OF CHANGE A N A Jan 24 1995 Initial Release B _ Oct 20 2000 ae a Option A Revised Table of C 260 00729 Sep 15 2008 Updated Company Logo and Format D 260 01059 Nov 7 2014 Updated Barfield logo 56 101 00920 D Nov 7 14 REV Page iv t BARFIELD TT1200 User Manual MAINTENANCE AND REPAIR INFORMATION The manufacturer of this equipment does not recommend the user to attempt any maintenance or repair In case of malfunction contact the manufacturer to obtain the list of approved repair facilities worldwide ensuring that this equipment will be serviced using proper procedures and certified instruments BARFIELD PRODUCT SUPPORT DIVISION Shipping Address Telephone 305 894 5400 Barfield Inc 800 321 1039 4101 NW 29th Street Miami Florida 33142 Fax 305 894 5401 USA Mailing Address Barfield Inc P O Box 025367 Miami FL 33102 5367 USA 56 101 00920 D Maint Nov 7 14 Page v i BARFIELD TT1200 User Manual This page intentionally left blank 56 101 00920 D Blank Nov 7 14 Page vi TT1200 User Manual TABLE O
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