Work it out.
Calculators
Ohm's law and power
Ohms lov · effektloven
Two resistors – series or parallel
Seriekobling · parallelkobling
DPMO and yield (soldering quality)
IPC-9261
Stencil aperture – area ratio and aspect ratio
IPC-7525
Solder paste – deposited solder volume per stencil aperture
SAC305-legering — producentdata (tjek datablad)
Reflow profile – heating and cooling time
IPC/JEDEC J-STD-020E
Time above liquidus – from belt speed
IPC/JEDEC J-STD-020E (blyfri TAL 60–150 s)
Moisture sensitivity (MSL) – remaining floor life
IPC/JEDEC J-STD-033
Ionic cleanliness – ROSE test contamination
IPC-6012E / IPC-TM-650 2.3.25
ESD wrist strap – resistance test (pass/fail)
ANSI/ESD S20.20 + S1.1 (håndledsrem)
Components back on the tape reel
EIA-481 (komponent-pitch på carrier tape)
Cable resistance and voltage drop
Ledningsfysik (kobbers resistivitet, materialehåndbogsværdi)
RC time constant – charging/discharging a capacitor
Kredsløbsteori (RC-kredsløb)
Voltage divider with two resistors
Kredsløbsteori (spændingsdeler)
Series resistor for LED
Kredsløbsteori (Ohms lov anvendt på LED)
Tools that work in all subjects
Whatever your programme is called, these tools calculate the same — Pythagoras, area, percentages and units are not tied to one trade.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.