Review and technical characteristics of the Mastech MS6812 digital locator tester. Review and technical specifications of Mastech MS6812 digital locator tester Tests and comparisons

The Mastech MS6812 cable tester-router is designed to locate a single wire or cable and trace its route in a cable line without damaging the insulation.
Using the MS6812, you can easily find hidden wiring of electrical and telephone cables, find the location of a broken cable, find the integrity of the wire (ring the cable), detect the tone signal and determine the polarity in the telephone line, as well as determine the line status (Busy, Calling, Idle).
Main functions:

Additional Information

• Checking cable integrity
• Receiving a cable or winding signal (telephone line)
• Determining the status of the telephone line (free, busy, dialing)
• Sends a single solid or double alternating signal to a point on a cable or winding
• Send frequency: 1.5kHz Receive frequency: 100Hz~300kHz
• Receiver output (square wave): single (1500Hz) or dual (1300 - 1500Hz)
• Checking the quality of the cable

Mastech MS6812 is a good assistant for specialists in the installation, maintenance and repair of telephone lines. The cable tester consists of a receiver and a transmitter. The transmitter generates a sinusoidal signal with a frequency of approximately 2 kHz and is equipped with red and black connecting wires and a standard 4-wire telephone cable with plug. The receiver consists of a highly sensitive sensor and an amplifier.
To search for wiring, just turn on the transmitter, connect the black wire to the body or ground, and the red wire to the circuit being tested. The receiver must be brought close to the line being tested; the sound volume will be greatest near the desired conductor. The sound level control in the receiver allows you to increase sensitivity and adjust the device to specific operating conditions. If necessary, you can use headphones; a special jack is provided for this. Power is supplied by a 9V battery.
Main characteristics:

Hello. In my review today, I will talk about the Mastech MS6812 cable tester-router. With its help, you can track how the wire is laid, look for damage in car wiring, network wiring, telephone and computer networks, and also check the condition, integrity and polarity of telephone lines. At the end of the review, you will see improvements to the locator to obtain a two-tone signal at the transmitter output, which makes the search much easier. If you are interested in this, then welcome to cat.

The order was placed on December 6th. On December 11, the store sent the goods by Swedish post and on January 17, I picked it up from the post office - this is the package:

Mastech MS6812 comes in a colorful cardboard box:

On the reverse side of which are the technical characteristics of the tester:

The tester itself is packed in a convenient bag made of thick fabric with a zipper:

In addition to the tester, the kit includes instructions in English:

Instructions

Reverse board:

Let's move on to the transmitter:

There are two LEDs on top of the transmitter.

“CONT”, with changeable color – serves to check the polarity, integrity and status (busy/idle/calling) of the telephone line. This is written in detail in the instructions for the tester.

“TONE” is a flashing LED indicating the TONE mode is on, in which a tone signal from the generator is sent to the wire or line being tested, which is received by the receiver.

On the bottom side of the transmitter there is a battery compartment:

The transmitter, like the receiver, is powered by a Krona battery. Only the transmitter had a dead battery that required replacement, which is strange. When measuring the transmitter consumption in the “OFF” switch position, there is no consumption at all.

On the side there is a switch “CONT” - “OFF” - “TONE”. Accordingly, it switches the transmitter operating modes: telephone line check/off/generator.

The outputs of the transmitter are two “crocodiles” connected to the line under test or an RJ-11 connector, which allows you to connect the transmitter to telephone sockets, and, if adapters are available, to plinths, etc. For example, you can use adapters from the signalman's handset, which I reviewed.

Let's open the transmitter:

The transmitter is built on a base consisting of six “NOT” elements, or inverters:

And, as you can see, on the board, in addition to the operating mode switch, there is another switch. This is a discrete volume switch.

I found a tester diagram on the Internet:

To finalize, we are interested in the transmitter, called a generator in the diagram. There is another microcircuit indicated there, but it’s just an analogue. The Russian analogue is K561LN2. Therefore there is no difference.

Elements DA 1.1 and DA 1.2 are a tone duration generator;

DA 1.3 and DA 1.4 – output stage;

DA 1.5 and DA 1.6 – tone generator.

To modify the tester into a two-tone one, just connect the cathode of the “TONE” LED to DA 1.1:

Now, with this position of the switch, which is not brought out:

We have a two-tone generator, and when the switch is switched, it becomes a single-tone generator. If desired, you can, having found a suitable slider, bring the switch out. But I did not do this, since the two-tone signal is much easier to identify and more convenient to use.

Briefly about how to use the generator. We connect the transmitter crocodiles to the pair being tested; if you need to check one wire, connect the red crocodile to the wire, and the black one to ground (in a car, to ground), while the wires must be de-energized.

Then, depending on what we need to find the ends or a break, we go to the end of the wire, turn on the receiver and, by moving the antenna over the wires, we find the ones we need based on the signal from the generator. To search for a break, we move the antenna along the wire route and watch when the generator signal disappears.

You can also look for hidden 220 volt wiring. To do this, you don’t even need to turn off the power to the wiring and use the transmitter. A receiver is enough. The wiring is quite accurately determined by the 50 Hertz AC background.

Well, about interference on neighboring wires. Here the two-tone generator showed itself just fine. Let me give you an example. Recently it was necessary to issue a number for an old, long unused outlet in a multi-story building. No documentation has been preserved. The pair for the socket leaves the plinths in this bundle of cables:

And finding a pair using the traditional method takes quite a lot of time; you also need to find a regular socket near the telephone socket to connect the generator.

Telephone cables run throughout the building, to the floors, in a common pile with electrical cables, alarms, and data networks.

We connect the transmitter to the telephone socket, and place the receiver antenna over the plinths. The plinth was found instantly. Slowly move the antenna over the pairs of the plinth and find the desired pair. The entire search, along with running around the floors to connect the transmitter, took five minutes.

Thank you for your attention.

The product was provided for writing a review by the store. The review was published in accordance with clause 18 of the Site Rules.