Activity pencils can be used in stationery stores to buy plastic pens. The shape of the pen before the transformation and the shape of the modified probe are shown in Figure 1 and Figure 2. The transformation method is as follows:
(1) Unplug the refill control button 8 and remove the lead core from the pen.
(2) The metal lead conduit 5 is pulled out from the tapered sleeve 4 of the pen.
(3) Take out the inner sleeve 2, and saw the outer sleeve 1 at the position shown in Fig. 1, leaving a useful part as shown in Fig. 3.
(4) A 2.5 mm hole (shown in Figure 3) is drilled 25 mm from the front end of the inner sleeve 2 so that the ground wire is led out from the hole.
(5) The front end of the tapered sleeve 4 is a groove of 0.8 mm deep so as to hook the wire and insert it into the groove during the test to prevent slippage.
(1) Take a 75Ω video cable with a length of 1m and an outer diameter of 3.5mm. The core wire is preferably a single copper wire with a diameter of 0.4mm.
(2) Peel off the plastic skin at 150 mm from the end face, and then pass the root of the inner core of the plastic core from the braided separator, as shown in Fig. 4.
(3) Peel off the inner plastic cladding layer 25mm away from the root, expose the bare copper wire, take about 36mm long and apply tin, and cut off the rest, as shown in Figure 4.
(4) Insert the processed cable head into the inner sleeve 2, and the metal isolation layer conductor is taken out from the grounding hole of the 2, as a grounding wire of the test probe, and a squid clip is welded at the end thereof, and the core wire is provided with The wires of the inner insulating layer are pushed to the bottom of the inner sleeve 2, the bare conductor portion is taken out from the head of the 2, and the threaded clamps 7 and 2 are tightened to tighten the thread, so that the cable core just protrudes from the chuck by about 3 mm.
(5) Find a pinned wire of a small gold-powered triode with a length of about 23 mm and a diameter of 0.3-0.4 mm. It is a gold-plated alloy wire that is hard and flexible. The wire and the cable core are welded to the exposed bare conductor of the chuck, and the soft plastic tube 3 is first placed on the outer sleeve 1, and then the tapered sleeve 4 is screwed on the outer sleeve 1 to expose the wire to the tip 3 ~4mm, and then bent into a hook with a needle-nosed pliers, as shown in Figure 2, as a hook connected to the point to be measured during the test.
(6) Take a heat shrinkable sleeve of 85mm length, inner diameter of 6~7mm and wall thickness of 0.5mm, and cover the outer surface of 2, so that the end face covers the ground lead hole, the end face is about 6mm from the center of the hole, and then the sleeve The tube portion is evenly heated on the kerosene lamp cover, and the heat-shrink tube will be in close contact with the outer wall of the cable 2, as shown in FIG.
(7) The other end of the cable can be soldered with a lotus plug as the input terminal for plugging in with the oscilloscope. If the input socket of the oscilloscope is a Q9 socket, a lotus and Q9 adapter plug can be connected.
Completed.
Two voltage dividing resistors can be placed in the inner sleeve 2, as shown in Fig. 5, and the resistor is preferably small in size. However, this resistor divider can only measure low frequency voltage below 1MHz. When testing high frequency voltage above HF, the capacitor divider compensator must be set at the same time, otherwise the measurement result is not accurate. In the probe, the inner hole is too small to be loaded. If necessary, consider adding an attenuation shielding box to the input plug. A 10:1 resistor-capacitor voltage divider can be installed. In addition, in order to further reduce the interference of external stray electromagnetic fields, a metal sleeve can be placed outside the probe. The specific manufacturing method can be designed by the reader.
Outdoor led screen Kiosk as led poster is a very effective, eye-catching medium which can be fabricated as per the requirement of the application. A outdoor led poster or led screen kiosk in a standee with has an in-built player connected to the screens which can be updated from any remote location by using digital signage software. This medium can be used to welcome guests, advertise products as well as disseminate important information relevant to its viewers.
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