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11/08/2026 · 0 comments

How to Choose an Oscilloscope in Egypt: Bandwidth, Channels and Budget

Choose bandwidth at roughly five times the fastest signal you need to measure, and treat sample rate as a separate specification. A 100MHz scope does not measure a 100MHz signal accurately — it measures it badly. The five-times rule exists because a square wave contains harmonics well above its stated frequency, and losing those harmonics distorts the shape you are trying to read.Bandwidth: the number that matters mostBandwidth is the frequency at which the scope's own response has fallen by 3dB — about 30% of amplitude. A signal measured at the bandwidth limit will appear smaller and rounder ..

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11/08/2026 · 0 comments

Multimeter vs Oscilloscope: What Each One Actually Tells You

A multimeter tells you a value; an oscilloscope shows you how that value behaves over time. A meter reading 5.0V looks perfect even when the rail is collapsing thousands of times a second, because the meter averages. If a fault is intermittent, noisy or timing-related, only a scope will show it.What a multimeter is genuinely better atDo not read this as "scopes are better". For a large share of everyday work the meter is the right tool and the faster one:Continuity — is this wire broken? A scope cannot answer that faster.Resistance — component values, sensor checks, winding tests.Steady voltag..

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11/08/2026 · 0 comments

Clamp Meters: Measuring Current Without Breaking the Circuit

A clamp meter measures current by sensing the magnetic field around a conductor, so nothing has to be disconnected. To measure current with a standard multimeter you must break the circuit and put the meter in series — impractical and often unsafe on a live installation. The clamp simply opens around the cable.How it works, and the one rule that trips peopleCurrent flowing through a conductor creates a magnetic field around it. The jaws concentrate that field onto a sensor, and the meter converts it to a current reading.The rule that catches everyone: clamp one conductor only. Clamp a two-core..

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11/08/2026 · 0 comments

Thermal Imaging for Electrical Fault Finding

Bad electrical connections get hot before they fail, and a thermal camera sees that heat from a safe distance without touching anything. A loose terminal has resistance; resistance under load produces heat. That heat is visible on an infrared image long before the joint burns, chars its insulation, or causes a fire.What thermal imaging findsLoose terminals — the single most common finding in any distribution board survey.Overloaded circuits — a breaker or cable running hotter than its neighbours under similar load.Phase imbalance — one phase visibly warmer than the other two.Failing components..

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11/08/2026 · 0 comments

Component Testers: Identifying Unknown Parts on the Bench

A component tester identifies an unknown part automatically and measures its key parameters. Connect any two or three legs in any order and it determines whether the part is a resistor, capacitor, inductor, diode, MOSFET or transistor, works out the pinout, and reports the values that matter.Why this saves real timeSalvaged and unmarked parts are a constant in repair work. Marking wears off, packages are ambiguous, and datasheets for older parts can be hard to find.Identifying a transistor manually means working out which leg is base, collector and emitter, determining NPN or PNP, and measurin..

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11/08/2026 · 0 comments

Choosing a Soldering Station: Temperature Control That Matters

Thermal recovery matters more than wattage. A good station holds tip temperature steady when it touches a heat-sinking joint; a cheap iron sags, and you compensate by pressing harder and staying longer — which is what lifts pads and damages components. Wattage is only a rough proxy for that ability.Why an unregulated iron causes damageA plain iron with no feedback heats until its element reaches equilibrium with the air. Touch it to a large ground plane or a thick wire and heat drains away faster than the element replaces it. Tip temperature collapses.The solder stops flowing. The natural resp..

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