Electrical Troubleshooter vs OT Toolbox

This app is a simple utility/game for learning electrical troubleshooting with a voltmeter. A voltmeter is one of the most valuable tools that an electrical troubleshooter can use. This is because most electrical problems are loose connection (open circuits), shorted devices or operator errors (no electrical problems). There are ten circuits in each game. Each circuit consist of an "Open", "Short" or "NoProblem". Solve the problems of the ten circuits with the fewest number of tries and shortest amount of time. If you do well, you receive the prestigious certification of a "5 Star Troubleshooter". Are you a 5 Star Electrical Troubleshooter?

OT Toolbox is a compact collection of practical tools for automation, controls engineering, commissioning, maintenance, and industrial service. Instead of searching through formulas, tables, and separate apps, keep essential OT calculations organized in one place – directly on your iPhone and without an account. NETWORKING AND INDUSTRIAL COMMUNICATION • IPv4 subnet calculator with network, broadcast, host range, and wildcard • IP comparison plus CIDR and subnet-mask conversion • IP planning, device inventory, and port reference • PROFINET device-name validation • OPC UA endpoint builder • Data-rate, transfer-time, and Ethernet frame-budget calculations SIGNALS AND INSTRUMENTATION • Linear scaling for analog values and PLC raw values • 4–20 mA troubleshooting, loop budgeting, and measurement-error estimation • PT100 resistance and temperature conversion • PT100 lead-wire error estimation • RC low-pass and ADC resolution calculations PLC, DATA, AND MODBUS • Binary, decimal, and hexadecimal conversion • Bit masks and two's-complement representation • Modbus address and FLOAT32 data conversion • Register-block planning and RTU timing • PLC time formats, watchdog sizing, memory demand, and cycle-load analysis ELECTRICAL AND ENERGY • Ohm's law plus active, apparent, and reactive power • Voltage drop and cable losses • 24 V DC power-supply sizing with reserve • UPS runtime and capacitor backup estimation • Energy consumption and operating-cost calculations DRIVES AND PNEUMATICS • Motor speed, motor torque, and gearbox calculations • Encoder resolution, positioning accuracy, and conveyor speed • Drive ramps and braking energy • Air consumption, cylinder force, and valve-island reserve SERVICE AND PRODUCTION • Unit, time, and cycle-time conversion • OEE and MTBF/MTTR availability • Maintenance-interval forecasting • Guidance calculation for safety distance • Formula reference for recurring tasks BUILT FOR DAILY FIELD WORK Clear field labels, units, and contextual help show exactly what to enter. Favorites, history, and templates bring frequently used tools back quickly. Colleague Mode presents results clearly and makes technical calculations easier to share. PRIVACY WITHOUT FRICTION Technical inputs stay locally on your device. No account, no tracking, and no ads. A selection of core tools is available for free. OT Toolbox Pro permanently unlocks advanced calculators and productivity features with one in-app purchase – no subscription. Important: Results are calculation aids. Manufacturer documentation, applicable standards, safety requirements, and review by qualified professionals always take priority.