The Barfield TT-1000A Digital Turbine Temperature Test Set, P/N 101-00901, is a portable, self-contained, and multi-functional device designed for troubleshooting and calibrating aircraft Chromel-Alumel (CH-AL) temperature indicating systems. It offers a range of capabilities for measuring and simulating temperature and resistance, with features engineered for ease of operation and maintenance.
Function Description
The primary function of the TT-1000A is to provide a comprehensive means for testing aircraft temperature indicating systems. This includes:
- Thermocouple and System Resistance Measurement: The device can measure thermocouple and system lead resistances with high accuracy.
- Insulation Measurement: It performs insulation measurements for system wiring and other components.
- Thermocouple Output Simulation: The TT-1000A simulates CH-AL thermocouple outputs, both with and without simulated system lead resistance, allowing for bench testing of indicators.
- Temperature Measurement: It directly measures and displays CH-AL thermocouple values in degrees Celsius (°C).
- Automatic Ambient Temperature Correction: The device automatically compensates for ambient temperature at the test lead connection junction point, or indicates this "cold junction" temperature.
Important Technical Specifications
Physical Data:
- Length: 8.0 inches (20.3 cm)
- Width: 5.5 inches (14.0 cm)
- Height: 5.0 inches (12.7 cm)
- Weight: 4.0 lbs (1.8 kg)
Temperature Measurement:
- Type: K (CH-AL Thermocouple)
- Range:
- 0 to 1000°C certified
- -25 to +1100°C extended
- 0 to 1200°C certified, -25 to +1225°C extended with option D
- Accuracy: Typical measurement error at 25°C ambient is less than ± 1°C.
- NIST Conformity (Test Clip Linearization):
- -25 to -21°C: Less than 2.0°C error
- -20 to 0°C: Less than 1.0°C error
- 0 to 90°C: Less than 0.6°C error
- 91 to 169°C: Less than 1.0°C error
- 170 to 1000°C: Less than 0.6°C error
- 1001 to 1025°C: Less than 1.0°C error
- 1026 to 1050°C: Less than 2.0°C error
- 1051 to 1100°C: Less than 5.0°C error
- Reference Junction Compensation (at Test Clips):
- 0 to 30°C: Less than 0.1°C error
- 31 to 40°C: Less than 0.3°C error
- 41 to 50°C: Less than 0.6°C error
- Error Table (0 to 1000°C at 25°C Ambient):
- Calibration Error: Less than 0.5°C
- Resolution & Repeatability: 1.0
- Total (including Ref. Jct.): 1.5 (+ NIST Conformity)
- Temperature Coefficient: 0.005% of reading per °C
Lead Resistance:
- 20 Ω Range: 0-19.99 Ω in 0.01 Ω increments.
- 200 Ω Range: 0-199.9 Ω in 0.1 Ω increments.
- Accuracy:
- ± 0.1% of reading ± 0.01 Ω (20 Ω Range)
- ± 0.1% of reading ± 0.1 Ω (200 Ω Range)
Insulation:
- Range: 0-1.999 MΩ in 1 kΩ increments.
- Accuracy: ± 3% of reading ± 0.003 MΩ.
- Excitation: 45V DC nominal.
Simulated System Resistance:
- Adjustment Range: Less than 2.0 Ω to greater than 25 Ω.
- Fixed Setting: Less than 0.1 Ω.
Usage Features
The TT-1000A is designed for user-friendliness with several key features:
- Controls:
- ON/OFF Switch (1): Powers all functions.
- TEMP. ADJ. Control Knob (3): A ten-turn potentiometer for precise adjustment of the millivoltage generator, displaying temperatures in °C on the LCD when the FUNCTION switch is in "INDICATOR TEST" position.
- FUNCTION Switch (4): A three-position rotary switch for selecting "RESISTANCE MEASURE", "INDICATOR TEST", and "TEMP. MEASURE".
- PUSH TO MEASURE ACFT. LEAD RES. (BLACK Pushbutton) (5): When depressed with test leads connected to the aircraft system and FUNCTION switch in "RESISTANCE MEASURE", displays system resistance.
- SHORT TEST LEADS AND PUSH TO SET SYSTEM RES. (RED Pushbutton) (6): When depressed with shorted test leads and FUNCTION switch in "RESISTANCE MEASURE", connects the "SYSTEM RES." potentiometer for system resistance adjustment.
- RESISTANCE RANGE Switch (7): A four-position rotary switch for selecting resistance ranges (20 Ω, 200 Ω, 2 MΩ - 0 Ω system resistance) and "BAT" position for monitoring the 45-volt battery.
- SYSTEM RES. Control Knob (8): A ten-turn potentiometer for adjusting simulated system lead resistance from 2 to 25 Ω when test leads are shorted and the RED pushbutton is depressed.
- Display: A large, 0.35 inch (9mm) high characters, 3 1/2 digit Liquid Crystal Display (LCD) with preprogrammed legends.
- Portability: Completely self-contained and easily portable.
- Carrying Case: Fabricated from drawn aluminum for strength, with a lid that automatically turns off the device when closed. It also provides space for test lead storage and includes abridged operating instructions on a placard.
- Battery Check: Includes a "BAT" warning indicating approximately 10% battery life remaining for the six 1.5V batteries. The 45-volt battery for insulation testing can also be checked.
- Hot Engine Testing Precaution: Provides a procedure for accurate resistance measurements on hot engines by taking two measurements with reversed polarity and averaging them.
- Polarity Observation: Emphasizes observing polarity when connecting test leads for indicator and temperature measurements (Alumel is negative, Chromel is positive).
- Voltage Converter: Instructions for connecting a 9 Volt alkaline battery to a Voltage Converter (P/N: 137-08001) to provide 45V output for insulation testing.
Maintenance Features
- Battery Installation/Replacement: Detailed instructions for replacing the six 1.5 volt AA batteries and the 45-volt No. 415 battery, including polarity observation. The "coin" battery has a minimum life expectancy of five years.
- Protective Circuits: Equipped with PCB1 F1 (AGC 1/2A) to protect against overloads through test leads and PCB1 D1 to prevent accidental reverse polarity application during 9-volt battery replacement.
- Service and Repair: The manufacturer does not recommend user maintenance or repair. In case of malfunction, users should contact the manufacturer to obtain a Return Maintenance Authorization (RMA) number and a list of approved repair facilities.
- Warranty: A limited one-year warranty covers defects in material and workmanship under normal use and service. Purchasers must register their product and present proof of original ownership for warranty claims.
- Recertification: The Test Set P/N 101-00901 has a one-year recertification requirement.
- Storage: Recommendations for storage include removing batteries, placing a four-ounce bag of desiccant inside the case, closing and latching the cover, and storing in a cool, dry place.
- Shipping: Recommends retaining factory-shipping container and packing materials for reshipment and inspecting for damage upon receipt.
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