Cable Testers for Audio, DMX, Network and Power: Which One Do You Need?

What a cable tester actually checks, which tester suits XLR, jack, speakON, RJ-45, DMX and HDMI, and where signal-cable testers stop and mains test equipment, which is for qualified electricians, begins.

~9 min read · Updated October 2026 · By the Stage Supply team

In this guide: The short answer · Signal testers vs mains test kit · Audio and multi-cable testers · DMX and RDM testers · HDMI testers · Mains test accessories · Comparison table · Which one for which job · Popular picks · FAQ

The short answer

For most bands, venues and hire stores, one multi-connector cable tester covers the cables most rigs carry: XLR, jack, speakON-type speaker leads and RJ-45 patch leads. The Palmer MCT XLV 2 is that kind of tester. If your work is mostly lighting, add a DMX tool that can also send and read DMX and talk RDM, such as the Elumen8 DT512 or the Chauvet Professional RDM2go. For HDMI in AV installs, a dedicated HDMI analyser like the CYP XA-3P is the right tool.

Mains is a separate subject. Testing power leads, distribution and installations needs proper electrical test instruments and a competent person. The diagnostic and test plugs we sell are accessories for qualified electricians, not a substitute for them.

How to coil, store, inspect and find the intermittent fault is covered in looking after your cables, so this guide sticks to choosing the tester.

Signal-cable testers vs mains test equipment

The products in our test equipment range fall into two groups that do very different jobs.

• Signal-cable testers check low-voltage cables with no power on them: microphone and line leads, speaker leads, DMX, network patch leads, HDMI. You plug both ends of an unplugged cable into the tester and it shows whether each pin connects through from one end to the other. Anyone who handles cables can use one.
• Mains test equipment checks the electrical safety of power leads, appliances, distribution and installations. That is PAT testing and electrical installation testing, done by a competent person with appropriate instruments. Our PAT testing guide for event equipment covers what the law asks for. This guide does not cover how to do it.

A signal-cable tester will not tell you anything about whether a mains lead is safe, and it should never be connected to anything live.

Audio and multi-cable testers

Palmer MCT XLV 2: one box for most connectors

Palmer (part of Adam Hall) lists the MCT XLV 2 as a tester for 11 connector types. The sockets cover 3 and 5-pin XLR male and female, 6.3mm and 3.5mm TRS jack, 4 and 8-pole speaker connectors compatible with speakON, RJ-45, RCA, 5-pin DIN (MIDI), USB-A, USB-B and S-Video.

It has automatic and manual test modes, with two strips of LEDs that Palmer says indicate pin connection and continuity. A pair of probes is included for cables with connectors that have no matching socket, and for checking wiring in studios and installations. It runs on two AA batteries, comes in a powder-coated steel housing (120 x 200 x 40mm, 0.95kg) and ships with a carry bag.

That spread is why it suits a mixed stock of cables. One tester handles mic leads, instrument leads, speaker leads, MIDI and patch leads. For background on the connectors themselves, see pro audio connectors explained; for why a correctly wired balanced lead matters, see balanced vs unbalanced audio.

Network cables: a continuity check, not a certification

An RJ-45 socket on a cable tester checks that each conductor connects through. That catches the common faults on a patch lead or an etherCON cable, such as a broken conductor or a badly crimped plug. It does not measure whether a run meets its Cat 5e or Cat 6 performance rating, which needs a dedicated certifier. For how network cable is used for audio, see audio networking explained.

Palmer MCT DMX: XLR and DMX only

If you only deal in XLR-terminated cable, the Palmer MCT DMX is the simpler choice. Palmer says it tests 3-pin and 5-pin DMX cables for continuity, in automatic mode or with manual selection of pins 1 to 5, and the 3-pin sockets also test XLR microphone cables. LEDs show the pin connection status. It runs on two AA batteries and comes with two L-brackets, so it can be fixed to a bench or wall in a cable store.

DMX and RDM testers

A DMX line can fail even when every cable passes a continuity test, because of a missing terminator, a bad fixture input or a wrong address. A DMX tester that can generate and read DMX lets you test the line and the fixtures, not just the copper. For the basics of DMX lines see DMX explained, and for terminators and 3-pin to 5-pin adaptors see DMX adaptors and terminators.

Elumen8 DT512

The DT512 is a handheld DMX and RDM tester for one universe. It has 5-pin DMX in and out, works as an RDM controller, includes a cable tester for 3-pin XLR cables, and has a MIDI interface. Operation is through a menu on an LCD. Prolight lists four AAA rechargeable batteries and a 9V DC, 500mA power supply, and a weight of 0.28kg.

Chauvet Professional RDM2go

The RDM2go is a palm-sized DMX/RDM tool. Chauvet lists fixture addressing and testing over RDM, DMX snapshot recording and playback, data monitoring and a cable integrity check, shown on an OLED display. It also addresses Chauvet Iluminarc IP fixtures that have no onboard display. The connector is 5-pin XLR, with two 3-to-5-pin adaptors included. A built-in lithium-ion battery gives about 8 hours and charges over micro USB.

City Theatrical DMXcat

The DMXcat is a small interface that connects to the DMX line through a 5-pin female XLR lead and talks to a phone over Bluetooth LE. The phone apps do the work: a DMX controller for a full universe, a fixture controller with a built-in fixture library, an RDM controller, a DMX tester, and a DIP switch calculator. The Android version adds an RF spectrum analyser and a light meter. It is rechargeable over micro USB, has a built-in torch, and City Theatrical lists a 5-pin male-to-male turnaround adaptor in the box. There is a belt pouch to suit.

Choose the DMXcat if you want fixture profiles and control from your phone. Choose the DT512 or RDM2go if you want a standalone tool with its own screen, with a built-in cable check.

HDMI testers

HDMI faults often look like source or display problems, so installers use an analyser that can stand in for either end. CYP makes three products in our range:

• CYP XA-3P. HDMI 2.0a with HDCP 1.4 and 2.2. Modes are system analysing, cable testing, pattern generation and EDID management. The cable test checks whether a cable can pass up to 18Gbps, with 5V and hot-plug detection. It runs from its battery or over USB.
• CYP XA-8P. HDMI 2.1 pattern generator and analyser for 8K sources, up to 40Gbps. CYP does not list a cable test mode for it. It runs on a lithium-ion battery (not included) or a USB-C supply.
• CYP XA-FAK. An installer kit in a hard case: an XA-3P, an HDMI repeater, an EDID manager, and 1m and 2m Ultra High Speed HDMI cables.

For when HDMI is the wrong cable for the run in the first place, see HDMI vs SDI for live events.

Mains test accessories (qualified electricians only)

Our test equipment category also holds accessories for electrical testing on event power. They are listed here so you can tell them apart from the cable testers above. Design, installation and testing of electrical systems is for a competent person. We do not give testing procedures.

• PCE CEE diagnostic plugs. The 16A 3P+E and 32A 3P+N+E versions are rated 400V and fit CEE (EN 60309-2) sockets. PCE’s manual lists rotating field, phase conductor, neutral conductor and protective earth checks, shown on LEDs (the 16A 3P+E has no neutral pole). PCE’s own wording is clear: “For qualified electricians use only” and “Only for temporary usage allowed”.
• Elumen8 CEEform test plugs. Plugs from 16A to 125A, such as the 16A 3P+N+E, 32A 3P+N+E, 63A 3P+N+E and 125A 3P+N+E. They are accessories for an electrician’s own test instrument, not testers in their own right.
• Elumen8 Powerlock test plugs. Single-pole plugs for each of L1, L2, L3, neutral and earth, for the same purpose on Powerlock outlets.
• Elumen8 Socapex test plug. The 19-pin Socapex test plug has shrouded, touchproof terminals for the test leads of a multifunction tester and a rotary selector switch, which Prolight says lets each circuit be tested individually without disconnecting the leads.

For background on the connectors and systems these fit, see event power distribution explained and Socapex explained.

Comparison table

Specifications below are from each manufacturer’s published information.

Which one for which job

• Band or small PA with a box of mixed leads: the Palmer MCT XLV 2. One tester covers mic, jack, speaker, MIDI and patch leads.
• Hire store or cable workshop doing XLR and DMX: the Palmer MCT DMX fixed to the bench, with an MCT XLV 2 for everything else.
• Lighting tech fault-finding on site: a DMX/RDM tool, the DT512 or RDM2go as a standalone unit, or the DMXcat if you prefer working from a phone.
• AV installer: the CYP XA-3P for HDMI 2.0 and cable testing, or the XA-FAK kit for spares as well.
• Electrician testing event distribution: the CEE diagnostic plugs and Elumen8 test plugs, used with your own test instruments.

A tester also earns its place in the show case. Our spares kit guide covers what else goes with it.

Popular picks from the shop

Frequently asked questions

What does a cable tester check?

A signal-cable tester checks continuity: that each pin of an unpowered cable connects through to the other end, with LEDs or a display showing the result. Some DMX tools, such as the Elumen8 DT512 and Chauvet RDM2go, also send and read DMX and RDM so you can test fixtures as well as cables.

Can one tester do XLR, jack, speakON and network cables?

Yes. The Palmer MCT XLV 2 has sockets for XLR, 6.3mm and 3.5mm jack, 4 and 8-pole speakON-compatible connectors, RJ-45, RCA, DIN/MIDI, USB and S-Video, plus probes for anything else.

Do I need a special tester for DMX cable?

For continuity, no: DMX uses XLR connectors, so an XLR tester such as the Palmer MCT DMX will check 3 and 5-pin DMX leads. A DMX/RDM tester adds the ability to check the data line and the fixtures on it, which a continuity tester cannot.

Can I test a network cable with an audio cable tester?

If it has an RJ-45 socket, it can check that each conductor connects through, which finds broken conductors and bad crimps. It cannot certify that the cable meets its Cat 5e or Cat 6 rating.

Can a cable tester PAT test a power lead?

No. A signal-cable tester is not a mains test instrument. PAT testing and electrical installation testing need appropriate instruments and a competent person; see our PAT testing guide for what applies to event equipment.