Barfield TT1000A and TT1200A – Side-by-Side Specs and Feature Breakdown
If your shop supports turbine temperature indicating systems (Chromel-Alumel / K-type thermocouple), the Barfield TT1000A and Barfield TT1200A are two of the most common go-to test sets. Both are built for aircraft turbine temperature system testing, but the TT1200A was designed as the “next-generation” option with expanded ranges, finer resolution, and more functions for newer indicators and modern maintenance workflows.
Below is a practical, side-by-side comparison to help you decide which model fits your maintenance requirements.
Quick takeaway
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Choose the TT1000A if you mainly need solid, portable turbine temp testing for common use cases (temperature, basic lead resistance, basic insulation) and you want a simpler unit.
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Choose the TT1200A if you need higher certified range, much higher insulation measurement capability, finer resistance/temperature resolution, and extra features that help with newer digital/glass cockpit indicators and documentation.
Comparison table 1: At-a-glance specs
| Category |
Barfield TT1000A |
Barfield TT1200A |
| Primary use |
Turbine temperature system test set (K-type / Chromel-Alumel) |
Turbine temperature system test set (K-type / Chromel-Alumel), expanded capabilities |
| Certified temp range |
0 to 1000°C (certified) |
0 to 1300°C (certified) |
| Extended temp range |
-60 to 1160°C (extended) |
-50 to 1372°C (extended) |
| Temp accuracy (typ @ 25°C) |
< ±1°C |
< ±0.5°C (spec sheet also lists ±0.3°C typ @ 25°C for temp measurement) |
| Temp resolution |
1°C |
0.1°C or 1°C (selectable) |
| Resistance measurement ranges |
20Ω, 200Ω |
20Ω, 200Ω, 2kΩ, 20kΩ |
| Minimum resistance resolution |
0.01Ω (20Ω range) |
0.001Ω (20Ω range) |
| Insulation measurement capability |
Up to ~1.999 MΩ |
Up to ~200 MΩ |
| Insulation excitation |
45 VDC nominal |
45 VDC |
| Power |
Battery powered |
Battery powered (common “C” cells) |
| Dimensions |
8.0" L × 5.5" W × 5.0" H |
11.0" W × 10.0" D × 7.0" H |
| Weight |
4.0 lb |
7.3 lb |
Where the numbers come from: TT1000A physical and measurement specs are documented in the TT1000A instruction manual; TT1200A specs and dimensions are listed in the TT1200A specification sheet; certified/extended range and comparative accuracy are summarized in Barfield’s turbine temperature specifications sheet.
Comparison table 2: Detailed measurement ranges and resolution
| Measurement |
TT1000A |
TT1200A |
| Temperature |
0–1000°C certified; -60–1160°C extended |
0–1300°C certified; -50–1372°C extended |
| Resistance – low range |
0–19.99Ω in 0.01Ω increments |
0–19.999Ω in 0.001Ω increments |
| Resistance – mid range |
0–199.9Ω in 0.1Ω increments |
0–199.99Ω in 0.01Ω increments |
| Resistance – higher ranges |
N/A |
0–1.9999kΩ (2k range); 0–19.999kΩ (20k range) |
| Insulation – lower ranges |
0–1.999 MΩ in 1kΩ increments |
0–199.9kΩ; 0–1.999MΩ; 0–19.99MΩ; 0–200MΩ |
| Insulation excitation |
45 VDC nominal |
45 VDC |
| Operating temp |
0 to 50°C (per spec sheet) |
-10 to 50°C (per spec sheet) |
These measurement/range differences are the biggest reason many shops upgrade: more resistance ranges, far higher insulation measurement ceiling, and finer resolution for more precise troubleshooting.
Feature breakdown: what changes in real-world maintenance?
1) Higher certified range + higher extended range
If you support newer indicators or demanding turbine temp checks, the TT1200A’s 1300°C certified and 1372°C extended range can matter—especially when you want headroom for certain indicators, checks, or troubleshooting scenarios.
2) Insulation testing: the TT1200A is in a different league
A common decision point: TT1000A tops out around ~2 MΩ, while the TT1200A goes up to ~200 MΩ. That difference is huge when you’re trying to isolate wiring insulation breakdown, leakage paths, or intermittent faults that don’t show up at low ranges.
3) Better resolution for deeper troubleshooting
When you need to spot subtle changes in lead resistance or verify very small resistive differences, the TT1200A’s 0.001Ω resolution (low range) can help you catch issues earlier or confirm repairs more confidently.
4) Modern usability and workflow features (TT1200A)
The TT1200A spec sheet highlights a microprocessor-based design, backlit alphanumeric display with prompts, calibration date display with alerts, display hold, and °C/°F/millivoltage displays—all geared toward faster testing and fewer operator mistakes, especially in the field.
Which one should you buy?
TT1000A is usually the right fit if:
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You mainly need standard turbine temp testing and basic checks
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You want a lighter unit (4 lb) for frequent carry/use
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Your maintenance scope doesn’t require high insulation ranges or ultra-fine resolution
TT1200A is usually the right fit if:
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You want more capability in one unit (more resistance ranges + far higher insulation range)
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You support newer digital/glass cockpit indicators and want modern usability features
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You want better long-term flexibility for mixed fleets and deeper troubleshooting
Get the right Barfield test set from AvionTEq
If you’re deciding between the Barfield TT1000A and TT1200A, AvionTEq can help you match the right unit to your aircraft, indicators, and maintenance workflow.
Visit www.avionteq.com to request a quote, check availability, or get support for sales, calibration, repair, and rental options for Barfield turbine temperature test sets.