{"product_id":"topdon-usa-bnc-to-4mm-adapter-diagnostic-accessory","title":"Topdon USA BNC to 4mm Adapter Diagnostic Accessory","description":"\u003cdiv class=\"divider\"\u003e\u003cimg src=\"https:\/\/cdn11.bigcommerce.com\/s-ew8kwapfc4\/images\/stencil\/original\/image-manager\/golden-bar.png?t=1681903157\" alt=\"\" width=\"1198\" height=\"8\"\u003e\u003c\/div\u003e \u003cdiv id=\"kd-main-product-feature-container\" class=\"kd-main-product-feature-container\"\u003e \u003cdiv class=\"panel\"\u003e \u003cdiv class=\"kd-product-feature-continer kd-flex-row-2\"\u003e \u003cdiv class=\"kd-prouduct-feature-item kd-prouduct-feature-content\"\u003e \u003ch2\u003eTopdon BNC to 4mm Adapter: The Piece That Makes The Rest Of The Scope Kit Work Together\u003c\/h2\u003e \u003cp\u003eA scope input is a BNC socket. Almost everything a technician actually wants to clip onto a vehicle — breakout leads, probes, an attenuator — terminates in \u003cstrong\u003e4mm\u003c\/strong\u003e connectors. This test lead is the piece that bridges the two: a male BNC at the instrument end, splitting to a pair of \u003cstrong\u003e4mm\u003c\/strong\u003e connectors at the working end, intended to help the Phoenix Scope read a range of signal types.\u003c\/p\u003e \u003cp\u003eIt is the least glamorous item in a scope kit and the one whose absence stops the kit being a kit. Without it you own an instrument and a box of leads that cannot reach each other.\u003c\/p\u003e \u003ch3\u003eThe colour-coding is the feature, not the packaging\u003c\/h3\u003e \u003cp\u003eThe two \u003cstrong\u003e4mm\u003c\/strong\u003e connectors are colour-coded: black is the earth wire and red is the positive pole. That is a small manufacturing decision with an outsized effect on a working day, because polarity on a scope is not like polarity on a multimeter.\u003c\/p\u003e \u003cp\u003eGet it backwards on a meter and you read a negative number, notice immediately, and swap the leads. Get it backwards on a scope and you get a waveform — an inverted one. It has the right amplitude, the right timing and the wrong shape, and it will happily lead a technician to conclude something confident and incorrect about a coil, an injector or a sensor. An adapter that makes the earth connection unmistakable at a glance removes an entire class of quiet errors, particularly for anyone who is not on a scope every day.\u003c\/p\u003e \u003cp\u003eThe manufacturer's guidance is specific about pairing: the red positive connector is the one to run to the 6-way Breakout Leads. Following that convention consistently is what makes a trace reproducible from one session to the next, and reproducibility is most of what makes a scope trustworthy.\u003c\/p\u003e \u003ch3\u003eIt works with the attenuator too\u003c\/h3\u003e \u003cp\u003eThese leads can also be used with the \u003ca href=\"\/products\/topdon-usa-hantek-20-1-attenuator-diagnostic-accessory\"\u003e20:1 attenuator\u003c\/a\u003e, which matters if you are assembling a diagnostic kit rather than buying a single item. The attenuator is what allows fuel injector and primary ignition waveform capture; this adapter is part of how it gets connected. Buying them at the same time avoids the familiar situation of owning both halves of a capability and being unable to join them until the next order arrives.\u003c\/p\u003e \u003ch3\u003eWhat it is, and what it is not\u003c\/h3\u003e \u003cp\u003eBe clear about the category. This is a passive test lead. It does not condition, scale, filter or protect a signal, and it does not extend what your scope is capable of measuring — it changes the shape of the connection and nothing more. If the measurement you are planning needs the signal reduced before it reaches the instrument, the adapter is not the part that does that job.\u003c\/p\u003e \u003cp\u003eIt is also specified here in the context of the Phoenix Scope. If you intend to use it with a different instrument, the connector standard makes that physically plausible and we are not going to claim compatibility we cannot source. Ask us with the instrument named and we will check before you order.\u003c\/p\u003e \u003ch3\u003ePerfect For\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cstrong\u003eWorkshops running a Phoenix Scope\u003c\/strong\u003e that need to connect breakout leads or an attenuator to the instrument.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eTechnicians building a scope kit incrementally\u003c\/strong\u003e, where this is the connecting piece rather than an optional extra.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eMobile diagnosticians\u003c\/strong\u003e who want a spare in the van, because a damaged lead ends the diagnostic part of a call-out entirely.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eTraining environments\u003c\/strong\u003e, where colour-coded polarity saves a great deal of explaining and a great deal of misreading.\u003c\/li\u003e \u003cli\u003e \u003cstrong\u003eAnyone who has already inverted a waveform once\u003c\/strong\u003e and would rather it did not become a habit.\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eWhat's in the Box\u003c\/h3\u003e \u003cp\u003eThe test lead: one male BNC connector splitting to two \u003cstrong\u003e4mm\u003c\/strong\u003e connectors, colour-coded black for earth and red for positive. Nothing else is stated in the information we hold and nothing else is implied — there is no scope, no breakout lead set and no attenuator included here. If you need a case, a longer lead or printed documentation, ask before ordering and we will confirm what the manufacturer supplies.\u003c\/p\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003ctable\u003e \u003ctbody\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eItem\u003c\/th\u003e \u003ctd\u003eBNC to 4mm adapter test lead\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eInstrument end\u003c\/th\u003e \u003ctd\u003eMale BNC connector\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eWorking end\u003c\/th\u003e \u003ctd\u003eTwo 4mm connectors\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eColour coding\u003c\/th\u003e \u003ctd\u003eBlack — earth wire; red — positive pole\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eIntended pairing\u003c\/th\u003e \u003ctd\u003eRed positive to the 6-way Breakout Leads\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eAlso works with\u003c\/th\u003e \u003ctd\u003eThe 20:1 attenuator\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eDesigned for\u003c\/th\u003e \u003ctd\u003eTopdon Phoenix Scope\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eLead length\u003c\/th\u003e \u003ctd\u003eNot published — ask and we will confirm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth scope=\"row\"\u003eCollection\u003c\/th\u003e \u003ctd\u003eDelivery or warehouse pickup\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch3\u003eWhat we will not guess\u003c\/h3\u003e \u003cp\u003eWe hold no published lead length, cable gauge, insulation rating, bandwidth or voltage rating for this accessory, and we will not estimate any of them. A rating is the kind of number a technician relies on when deciding whether a measurement is safe to make, so an approximate one is worse than an honest blank. Your instrument's documentation states what it expects at its input, and that is the document to work from. Tell us what you are trying to measure and we will check this lead against the manufacturer's documentation before you buy.\u003c\/p\u003e \u003ch3\u003eCertification and compliance\u003c\/h3\u003e \u003cp\u003eNo third-party safety listing or conformity scheme is published for this item in the information we hold, and this page claims none. It is stated rather than left blank because a badge inferred from silence is the hardest to correct later, and because measurement accessories used around energised circuits are exactly the category where an employer, an insurer or a training provider may ask for documented ratings. If yours does, ask us and we will obtain the current manufacturer documentation before you commit.\u003c\/p\u003e \u003ch3\u003eDelivery and pickup\u003c\/h3\u003e \u003cp\u003eThis ships as a small parcel item within the lower 48 states, or you are welcome to collect it from the warehouse. This item ships free, so there is nothing to add at checkout. Open the package on arrival and check the connectors before you sign — a bent BNC shell or a crushed connector is easy to see at the door and hard to claim for once the paperwork says the goods arrived in good order.\u003c\/p\u003e \u003ch3\u003eWarranty\u003c\/h3\u003e \u003cp\u003eTerms and the claim process are published on our \u003ca href=\"https:\/\/mechanicsuperstore.com\/pages\/warranty-claims\"\u003ewarranty claims page\u003c\/a\u003e. No term is printed here because none is stated in the information we hold; ask before ordering and we will confirm the current manufacturer position. If the lead fails, keep it as it is and contact us before cutting, splicing or re-terminating it. A repaired lead cannot be assessed, and on a test lead it also cannot be trusted afterwards — an intermittent joint inside a repair is indistinguishable, on screen, from an intermittent fault in the vehicle.\u003c\/p\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003cdiv class=\"divider\"\u003e\u003cimg src=\"https:\/\/cdn11.bigcommerce.com\/s-ew8kwapfc4\/images\/stencil\/original\/image-manager\/golden-bar.png?t=1681903157\" alt=\"\" width=\"1198\" height=\"8\"\u003e\u003c\/div\u003e \u003cdiv id=\"kd-main-product-downloads-container\" class=\"kd-main-product-downloads-container\"\u003e\u003c\/div\u003e \u003cdiv class=\"divider\"\u003e\u003c\/div\u003e","brand":"TOPDON","offers":[{"title":"Default Title","offer_id":54965169127763,"sku":"BNC4MM","price":13.0,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/progradewarehouse.com\/products\/topdon-usa-bnc-to-4mm-adapter-diagnostic-accessory","provider":"PRO GRADE WAREHOUSE","version":"1.0","type":"link"}