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A thermographer measures a surface temperature of 85°C on a motor with an assumed emissivity of 0.95. The actual surface is bare aluminum with an emissivity of 0.05. The reflected temperature is 22°C. What is the most accurate statement about this measurement?

The reading is accurate because the camera is calibrated to 85°C

The apparent temperature is heavily influenced by reflected ambient radiation, making 85°C unreliable

Aluminum emissivity of 0.05 means the reading will be 5% lower than actual

Reflected temperature compensation has no effect when emissivity is set correctly

to track

2026 Statistics

Key Facts: ITC Level II Exam

ΔT >35°C vs. Reference

NETA ATS

40%

Minimum Load for Electrical IR

Industry Standard

0.98

Water Emissivity (8–14 µm)

ITC Reference

10°C

Min ΔT for Building Envelope

ASHRAE

5 params

Required Camera Parameters

ITC Level II

$595

Exam Fee

Infraspection Institute

The Certified Infrared Thermographer Level II certification from ITC / Infraspection Institute validates advanced quantitative IR thermography competency. Level II thermographers apply emissivity correction (reference emitter, tape, paint, and direct methods), measure reflected apparent temperature, correct for IR window transmittance, and classify findings per NETA ATS (P1–P4), ISO 18434-1, and ASHRAE guidelines. They also perform trending and baseline comparison, supervise Level I inspectors, and produce complete inspection reports with severity classifications and corrective action recommendations.

Sample ITC Level II Practice Questions

Try these sample questions to test your ITC Level II exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A thermographer measures a surface temperature of 85°C on a motor with an assumed emissivity of 0.95. The actual surface is bare aluminum with an emissivity of 0.05. The reflected temperature is 22°C. What is the most accurate statement about this measurement?

A.The reading is accurate because the camera is calibrated to 85°C

B.The apparent temperature is heavily influenced by reflected ambient radiation, making 85°C unreliable

C.Aluminum emissivity of 0.05 means the reading will be 5% lower than actual

D.Reflected temperature compensation has no effect when emissivity is set correctly

Explanation: With very low emissivity (0.05), 95% of the camera's signal comes from reflected energy rather than the object's own emission. The 85°C reading is dominated by reflected sources, not the aluminum surface temperature. This is why polished metals require emissivity correction or an alternate technique such as applying tape or paint to create a known-emissivity patch.

2Which emissivity correction method is MOST appropriate when you cannot touch or coat the surface being inspected?

A.Reference emitter method using black tape applied to the surface

B.Contact thermometer method to establish a reference temperature

C.Reflected apparent temperature (RAT) compensation using a crumpled foil reflector

D.Increasing camera emissivity to 1.0 and subtracting reflected temperature mathematically

Explanation: The reflected apparent temperature (RAT) method using a crumpled aluminum foil reflector pointed away from radiant sources can be performed without touching the surface. A foil reflector with very low emissivity approximates a perfect reflector; its apparent temperature, when pointed at the background radiation, gives the reflected temperature needed for proper compensation. This is standard ITC Level II technique for surfaces that cannot be coated or touched.

3A Level II thermographer is inspecting electrical switchgear through a polycarbonate IR window rated at 80% transmittance in the 8–14 µm band. The camera measures 68°C on a busbar. What correction must be applied?

A.No correction needed; the window rating accounts for all losses

B.Divide the measured temperature by 0.80 to get the true temperature

C.Set the camera's transmittance parameter to 0.80 so the camera compensates automatically

D.Increase the measured temperature by 20% to compensate for window losses

Explanation: Modern IR cameras include a transmittance (tau) parameter specifically for inspections through IR windows or other partially transparent media. Setting transmittance to 0.80 causes the camera's thermal model to account for the 20% energy attenuation, yielding a compensated temperature reading. Simply dividing or adding percentages to temperature values is mathematically incorrect because temperature is not linearly proportional to radiance.

4According to the NETA ATS standard for electrical equipment, a temperature difference of 35°C above a similar component under similar load is classified as:

A.Priority 4 — monitor at next scheduled inspection

B.Priority 3 — schedule repair within 30 days

C.Priority 2 — repair within 24 hours or next maintenance window

D.Priority 1 — remove from service immediately

Explanation: NETA ATS severity criteria classify temperature differences (ΔT compared to a reference component under similar load): ΔT 1–10°C = Priority 4 (monitor), ΔT 11–20°C = Priority 3 (watch), ΔT 21–35°C = Priority 2 (scheduled repair), and ΔT > 35°C = Priority 1 (immediate action/remove from service). A 35°C differential meets the threshold for immediate action per NETA ATS.

5When setting up a camera for an outdoor inspection on a cold day (ambient 5°C), which parameters must the thermographer enter to ensure accurate temperature measurement?

A.Object emissivity only — ambient temperature is irrelevant for outdoor scenes

B.Object emissivity, reflected apparent temperature, atmospheric temperature, relative humidity, and distance

C.Object emissivity and reflected apparent temperature only

D.Atmospheric temperature and relative humidity only, since emissivity is typically 1.0 outdoors

Explanation: Accurate quantitative thermal measurement requires all five camera parameters: (1) object emissivity, (2) reflected apparent temperature (background radiation), (3) atmospheric temperature (affects path attenuation), (4) relative humidity (water vapor absorbs IR), and (5) distance (determines path length). On cold, humid days all five matter — humid atmospheres absorb more IR, and cold backgrounds create significant reflected temperature errors on lower-emissivity surfaces.

6A thermographer uses the reference emitter method to determine emissivity of a painted pipe. A piece of black tape is applied to the pipe, and after thermal equilibration the tape reads 48°C while the adjacent bare pipe reads 51°C. The emissivity of the pipe surface is approximately:

A.0.72

B.0.85

C.0.94

D.Cannot be determined without knowing camera FOV

Explanation: In the reference emitter method, the tape (emissivity ~0.95) is used to establish actual surface temperature. The camera emissivity is then adjusted until the adjacent unadjusted-emissivity pipe reading matches the tape temperature. Iterative adjustment to match 48°C on both regions yields the pipe emissivity. For a painted surface showing ~3°C apparent difference, the computed emissivity typically falls in the 0.85–0.92 range. The closest standard answer for typical industrial paint on steel is 0.85.

7ISO 18434-1 defines severity criteria for rotating machinery based on absolute surface temperatures. Which temperature zone typically triggers immediate corrective action for bearing housings?

A.Surface temperature above 40°C

B.Surface temperature above 60°C

C.Surface temperature above 80°C

D.Temperature increase of more than 10°C above baseline trend

Explanation: ISO 18434-1 for condition monitoring of rotating machinery classifies bearing housing temperatures in zones: Zone A (<60°C) = normal, Zone B (60–80°C) = monitor, Zone C (80–100°C) = investigate/schedule repair, Zone D (>100°C) = immediate action. However, many practitioners use 80°C as the threshold where action becomes urgent, and a temperature exceeding 80°C in absolute terms typically triggers corrective action protocols. Context and baseline trending are also applied.

8A thermographer is comparing two thermal images of the same circuit breaker taken six months apart. The first image shows a 12°C differential; the current image shows a 28°C differential under the same load conditions. The BEST interpretation is:

A.The camera calibration has drifted and the images are not comparable

B.The fault is progressing and the component should be elevated to a higher priority

C.The change is within normal measurement uncertainty and can be disregarded

D.The fault has stabilized since 28°C does not exceed the 35°C Priority 1 threshold

Explanation: Trending is a core Level II skill. A change from 12°C to 28°C ΔT under identical load conditions over six months indicates a progressing fault — the rate of deterioration is accelerating. Even though 28°C has not crossed the NETA 35°C Priority 1 threshold, the trend toward increasing severity warrants elevation in priority and potentially shortening the re-inspection interval. Trending is often more diagnostic than a single snapshot.

9What is the primary purpose of establishing a thermal baseline for electrical switchgear?

A.To document the camera model and settings for the inspection record

B.To provide a reference against which future inspections can detect changes indicating developing faults

C.To determine the ambient temperature at time of inspection

D.To satisfy OSHA requirements for infrared inspection records

Explanation: A thermal baseline documents the normal thermal signature of equipment under known load conditions. Future inspections compare against this baseline to detect temperature increases, pattern changes, or new anomalies that may indicate developing electrical or mechanical faults. Baselines are especially valuable for equipment types where absolute temperatures vary widely by design, making trend comparison more reliable than absolute thresholds alone.

10Which of the following emissivity values is MOST accurate for polished stainless steel?

A.0.05–0.10

B.0.12–0.18

C.0.45–0.60

D.0.85–0.95

Explanation: Polished stainless steel has an emissivity in the range of approximately 0.10–0.16 in the 8–14 µm thermal IR band. This puts it in the low-emissivity category typical of polished metals. Emissivity varies by surface condition — oxidized or bead-blasted stainless can reach 0.3–0.6, while polished mirror-finish stainless is 0.10–0.18. Level II thermographers must know these ranges to choose appropriate measurement methods.

About the ITC Level II Exam

The ITC / Infraspection Institute Level II Certified Infrared Thermographer exam tests advanced quantitative thermography skills including precise temperature measurement with emissivity correction, severity classification per NETA ATS and ISO 18434 standards, trending analysis, and QA/QC of Level I inspector work.

Questions

100 scored questions

Time Limit

3 hours

Passing Score

75%

Exam Fee

$595 (Infrared Training Center (ITC) / Infraspection Institute)

ITC Level II Exam Content Outline

25%

Emissivity Correction & Measurement Setup

Reference emitter, tape, paint, and direct methods; reflected apparent temperature; IR window transmittance; camera parameter setup

20%

Severity Classification Standards

NETA ATS Priority 1–4 criteria, ISO 18434-1 rotating machinery zones, ASHRAE building envelope ΔT requirements

20%

Data Analysis & Pattern Interpretation

Electrical fault patterns, mechanical defect signatures, building envelope anomalies, steam system inspection

15%

Trending & Baseline Comparison

Establishing baselines, rate-of-change analysis, trend escalation criteria, multi-year data analysis

10%

QA/QC of Level I Work

Parameter verification, equipment identification review, coverage completeness, finding reclassification

10%

Reporting Standards & Professional Ethics

Report content requirements, image documentation, professional ethics, client communication

How to Pass the ITC Level II Exam

What You Need to Know

Passing score: 75%
Exam length: 100 questions
Time limit: 3 hours
Exam fee: $595

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ITC Level II Study Tips from Top Performers

1Memorize NETA ATS Priority 1–4 ΔT thresholds: P4=1–10°C, P3=11–20°C, P2=21–35°C, P1=>35°C

2Know emissivity ranges by material: polished metals 0.05–0.15, oxidized metals 0.30–0.80, paints/plastics/water 0.85–0.98

3Practice all four emissivity correction methods — tape, paint, RAT foil reflector, and direct

4Understand that all five camera parameters must be correct: emissivity, RAT, atmospheric temp, RH, and distance

5Review ASHRAE minimum 10°C ΔT for building envelope and flat roof inspection protocols

6Know the Level II QA/QC responsibilities: parameter verification, equipment ID, coverage completeness, and reclassification

Frequently Asked Questions

What is the ITC Level II thermographer exam?

The ITC (Infrared Training Center) / Infraspection Institute Level II Certified Infrared Thermographer exam validates advanced quantitative IR thermography skills. Level II thermographers must demonstrate mastery of emissivity correction methods, severity classification per NETA ATS and ISO 18434-1 standards, trending and baseline analysis, and QA/QC review of Level I work. The exam covers electrical, mechanical, and building envelope thermography applications.

What emissivity correction methods are tested at Level II?

Level II exams cover four emissivity correction methods: (1) Reference emitter — applying tape or paint and iterating camera emissivity until surfaces read the same; (2) Contact thermometer — measuring true temperature and back-calculating emissivity; (3) Reflected apparent temperature (RAT) — using a crumpled foil reflector to measure background radiation without touching the surface; and (4) Direct measurement using camera software with published emissivity tables. Polished metals (ε=0.05–0.15), oxidized metals (ε=0.30–0.80), and paints/plastics (ε=0.85–0.95) are key material groups.

What are the NETA ATS severity criteria for electrical thermography?

NETA ATS classifies electrical anomalies by temperature difference (ΔT) vs. a similar reference component under similar load: Priority 4 (ΔT 1–10°C) = monitor at next inspection; Priority 3 (ΔT 11–20°C) = schedule repair at next outage; Priority 2 (ΔT 21–35°C) = repair before next maintenance or within 24 hours; Priority 1 (ΔT >35°C) = immediate action, consider de-energizing. Minimum load for valid electrical IR inspection is 40% of rated capacity.

How does Level II differ from Level I thermography certification?

Level I thermographers perform qualitative or limited quantitative scanning under supervision. Level II adds: full quantitative temperature measurement with emissivity and atmospheric corrections, severity classification against NETA/ISO/ASHRAE standards, trending and baseline comparison across multiple inspections, QA/QC review and sign-off authority for Level I data, and authorship of complete formal inspection reports with corrective action recommendations.

What does the ITC Level II exam cover for building envelope thermography?

Building envelope topics include ASHRAE minimum ΔT of 10°C (18°F) interior-exterior for meaningful wall inspections, interior mode during heating season for insulation defect detection, flat roof inspection protocols (1–4 hours post-sunset, wind <15 mph per ASTM C1153), air infiltration detection using blower door combined with IR, thermal bridging through structural framing, and interpretation of warm/cool pattern signatures for moisture, air leakage, and insulation defects.