- BEE-D Domain Overview
- Domain 1: Numbering Systems and Conversions
- Domain 2: Block Diagrams - Schematics-Wiring Diagrams
- Domain 3: Test Equipment and Measurements
- Domain 4: Safety Precautions
- Domain 5: Theory of Digital Logic Functions and Circuitry
- How the Domains Show Up on Exam Day
- Mapping the Domains to a Study Schedule
- FAQ
- BEE-D covers exactly five domains, from number systems to safety to logic theory.
- The exam is a proctored, in-person performance assessment on a Nida 130E (or later) trainer.
- You need a 70% passing score and pay a USD 100 fee per certification.
- Hands-on tasks emphasize logic-probe readings, truth tables, gate fault isolation, 555 timers, and flip-flop troubleshooting.
BEE-D Domain Overview
Basic Electricity and Electronics - Digital (BEE-D) is administered by Certifying Technical Employee Competence (CertTEC), a division of SpaceTEC Partners, Inc. Unlike a purely multiple-choice knowledge test, BEE-D is built around a proctored, in-person performance assessment delivered through SPI's online Examination Management System. That format matters because it changes what "studying the domains" actually means: you're not just memorizing facts, you're rehearsing measurements and fault-isolation steps on real test equipment.
CertTEC's published Digital competency topics group everything a candidate must demonstrate into five domains. If you haven't already, it's worth reading our companion piece on what BEE-D is and what the credential actually signifies before diving into domain specifics, since the exam format shapes how each domain is tested.
Domain 1: Numbering Systems and Conversions
Numbering Systems and Conversions
This domain establishes the mathematical language behind every digital circuit you'll troubleshoot on the assessment cards. Candidates must be fluent in converting between systems without a calculator, because these conversions feed directly into truth-table and logic-function work in later domains.
- Binary, octal, decimal, and hexadecimal conversions in both directions
- Binary-coded decimal (BCD) representation
- Addition and subtraction in binary, including two's complement concepts
- Recognizing bit patterns quickly enough to support live troubleshooting under time pressure
Because this domain is foundational, weak recall here tends to slow you down everywhere else on the assessment cards. If you want a fast-reference sheet for these conversions, our BEE-D cheat sheet condenses the most commonly missed conversion patterns onto one page.
Domain 2: Block Diagrams - Schematics-Wiring Diagrams
Block Diagrams - Schematics-Wiring Diagrams
This domain tests your ability to read and interpret the documentation that accompanies any digital circuit board, including the CertTEC assessment circuit cards used during the practical exam. You're expected to trace signal paths, identify components by their schematic symbols, and correlate a wiring diagram to the physical layout of a board.
- Interpreting standard logic-gate and IC schematic symbols
- Tracing signal flow from block diagrams down to component-level wiring
- Cross-referencing pin numbers and connector labels against a wiring diagram
- Using documentation to plan a fault-isolation sequence before touching test equipment
This is one of the domains where candidates who only studied theory get caught off guard, because the performance assessment requires you to physically locate points on a real card, not just answer questions about a diagram on paper.
Domain 3: Test Equipment and Measurements
Test Equipment and Measurements
This is the most hands-on domain and the one most tied to the exam's required equipment list: a multimeter, a function generator, an oscilloscope, and a logic probe used alongside the Nida 130E (or later) trainer. Candidates must know not just how to operate each instrument, but which one is appropriate for a given digital fault.
- Taking accurate logic-probe measurements to identify high, low, and floating states
- Setting up a function generator to inject test signals into a digital circuit
- Reading waveforms on an oscilloscope to spot timing or signal-integrity problems
- Using a multimeter for continuity, resistance, and voltage checks on digital assessment cards
Domain 4: Safety Precautions
Safety Precautions
Because BEE-D is a hands-on, proctored assessment involving live test equipment and energized circuit cards, safety is treated as its own standalone domain rather than a footnote. Proctors expect candidates to demonstrate safe habits automatically, without being prompted.
- Proper handling and grounding procedures around test equipment and digital assessment cards
- Recognizing hazards specific to bench-level electronics work
- Correct setup and shutdown sequences for the oscilloscope, function generator, and multimeter
- General precautions for working near powered circuits during a timed practical exam
Because safety habits are observed throughout the entire practical session rather than tested as a discrete section, sloppy technique in an earlier domain can cost you points here too.
Domain 5: Theory of Digital Logic Functions and Circuitry
Theory of Digital Logic Functions and Circuitry
This domain is the conceptual core of BEE-D. It ties numbering systems (Domain 1) to the physical fault-isolation work you perform with test equipment (Domain 3), and it's where most of the practical troubleshooting tasks on the assessment cards originate.
- Truth-table construction and analysis for basic and combinational logic gates
- Logic-gate identification and fault isolation on live circuit cards
- 555 timer circuit operation and common failure symptoms
- D-type and JK flip-flop behavior, clocking, and troubleshooting
- Applying Boolean logic concepts to predict expected outputs before measuring
Candidates consistently report that Domain 5 requires the most bench repetition, since flip-flop and 555 timer faults can present with subtle symptoms that are easy to misdiagnose under time pressure. For a broader sense of how difficult this domain feels relative to the others, see how hard the BEE-D exam really is.
How the Domains Show Up on Exam Day
All five domains converge into a single proctored, in-person performance assessment rather than five separate tests. You'll work with two CertTEC assessment circuit cards per discipline, a Nida 130E or later trainer, a multimeter, a function generator, and an oscilloscope. The exam specifications behind this structure come from SPI's catalog, revised March 1, 2025, and follow CertTEC's published Digital competency topics.
| Exam Detail | Specification |
|---|---|
| Certifying body | CertTEC, a division of SpaceTEC Partners, Inc. |
| Format | Proctored, in-person performance assessment via SPI's Examination Management System |
| Passing score | 70% |
| Exam fee | USD 100 per certification |
| Certification validity | 3 years |
| Core equipment | Two assessment circuit cards, Nida 130E+ trainer, multimeter, function generator, oscilloscope |
To pass, you need a 70% score across the performance assessment, which is documented in detail in our BEE-D passing score breakdown. If you're still confirming eligibility routes - relevant training or work experience, a related military rating, or graduation from a relevant college or technical-school program - our BEE-D requirements guide walks through each path. Registration logistics and testing windows are covered separately in our BEE-D exam dates guide.
Key Takeaway
Because the exam is performance-based, memorizing domain definitions isn't enough - you need repeated hands-on time with a multimeter, function generator, oscilloscope, and logic probe before test day.
Mapping the Domains to a Study Schedule
A domain-aware schedule beats generic review because it respects the dependency chain: Domain 1 feeds Domain 5, and Domains 2 and 3 feed the practical fault-isolation work tested throughout the assessment. Here's one way to sequence four weeks of preparation around the five domains.
Domains 1 & 2
- Drill binary/octal/decimal/hex conversions until automatic
- Practice reading block diagrams and wiring diagrams against sample schematics
Domain 3
- Get hands-on time with a multimeter, function generator, and oscilloscope
- Practice logic-probe readings on a Nida-style trainer if available
Domain 5
- Build and analyze truth tables for common gate combinations
- Rehearse 555 timer and D-type/JK flip-flop fault-isolation scenarios
Domain 4 & Full Review
- Review safety procedures for equipment setup, grounding, and shutdown
- Run a full mock performance assessment combining all five domains
For a more complete walkthrough of preparation strategy beyond scheduling, see our BEE-D study guide, and check what the BEE-D pass rate data shows to calibrate how much practice time is realistic for your background.
Who Uses These Five Domains on the Job
Employers who hire for digital electronics maintenance and technician roles look for the exact skills these five domains describe: reading schematics, taking accurate measurements, isolating faults in logic circuitry, and following safety procedures around live equipment. If you're weighing whether the credential is worth pursuing given your career goals, our analysis of whether BEE-D certification is worth it and our BEE-D salary guide both dig into how these domain skills translate into job qualifications. You can also browse BEE-D-related job paths to see how the domains map to real postings.
Before you commit to the fee, it's worth understanding the full cost picture, including renewal options. Our BEE-D certification cost breakdown covers the USD 100 exam fee alongside renewal paths - verified employment for at least 12 of the preceding 36 months (USD 10 for an emailed certificate, USD 25 for a mailed copy), at least 18 Alternate Recertification Credits (USD 15), or an equivalent knowledge exam (USD 50).
Frequently Asked Questions
Five: Numbering Systems and Conversions, Block Diagrams - Schematics-Wiring Diagrams, Test Equipment and Measurements, Safety Precautions, and Theory of Digital Logic Functions and Circuitry.
BEE-D is delivered as a proctored, in-person performance assessment through SPI's online Examination Management System, not a standard multiple-choice test. You demonstrate skills directly on assessment circuit cards using a Nida 130E or later trainer.
Many candidates find Theory of Digital Logic Functions and Circuitry the most demanding, since it requires hands-on fluency with truth tables, 555 timers, and D-type/JK flip-flop troubleshooting rather than pure recall.
Get comfortable with a multimeter, function generator, oscilloscope, and logic probe, since these are the required instruments used alongside the Nida 130E (or later) trainer during the assessment.
BEE-D certification is valid for 3 years, after which you can renew through verified work experience, Alternate Recertification Credits, or an equivalent knowledge exam.