Oscillator probe, Oscilloscope Probe
Keywords: oscilloscope probe production
The oscilloscope probe is generally not easy to buy, and the price is also high. A homemade oscilloscope (or other test) probe introduced herein is made of activity pencil restructuring. First, the pencil renovation method Active pencil can choose a plastic pen in the stationery store. The strip of the pen before the transformation and the transformation of the probes shown in Figures 1 and 2, the transformation method is as follows: (1) Unplug the refill control button 8, remove the in-line lead core. (2) Unplug the metal lead catheter 5 from the pen head tapered set 4. (3) Remove the inner casing 2, saw the outer casing 1 according to the position in Fig. 1, and leave a useful portion to see Figure 3. (4) A 2.5 mm hole (as shown in Figure 3) is drilled at 25 mm from the front end 2 (shown in Figure 3) so that the ground is taken out from this well. (5) The front end of the pen head tapered set 4 is a groove of a 0.8 mm deep, so that the wire is hooked when it is tested and embeds it into the groove to prevent sliding.
Second, the cable processing and connection method (1) take a 75Ω video cable having a length of 1m, an outer diameter of 3.5 mm, and the core wire is preferably a copper wire having a single strand diameter of 0.4 mm. (2) Pee the plastic skin at 150 mm from the end surface, and then the inner layer plastic core is applied from the braided isolation layer, as shown in FIG. (3) Pee the inner layer of the inner layer of 25 mm from the root portion, exposed bare copper wire, with a length of about 36 mm and tin, and the rest is cut off, as shown in Figure 4. (4) Put the machined cable head into the inner sleeve 2, the metal isolation layer conductor is taken from the ground hole of the 2, as the grounding line of the test probe, welding a squid clip in its end, and the core line The wire of the inner insulating layer is pushed to the bottom of the inner sleeve 2, and the naked conductor portion is drawn from the head of 2, and the adult ship collet 7 and 2 are tightened, so that the cable core wire is just about 3 mm.
(5) Find a waste gold seal small power triode pin line, with a length of about 23mm, a diameter of 0.3 ~ 0.4mm, which is a gold-plated alloy wire, which is hard and elastic. This wire and the cable core wire are welded in the collet, and the soft plastic tube is 3 sets on the outer casing 1, and then tighten the head cone 4 on the outer sleeve 1, so that the metal is reverating the head 3 ~ 4mm, bend with a hook, as shown in FIG. 2, the hook connected to the measured point as the test. (6) Take a long 85mm long, a heat shrinkable sleeve of 6 to 7 mm, wall thickness is 0.5mm, cover the outside of 2, so that the end face covers the leader lead, the end surface is about 6mm, then the set will The tube portion is uniformly heat on the kerosene lampshade, and the heat shrink tube will close the outer wall of 2 and the cable, as shown in Figure 2. (7) The other end of the cable can be welded to a lotus plug as an input to the oscilloscope, if the input sleeve of the oscilloscope is the Q9 socket, then a lotus and Q9 adapter plug can be connected, and the production process is completed.
Third, the attenuation probe of 10: 1 can be loaded into two voltage resistors in the inner casing 2, as shown in FIG. 5, the resistance is preferably smaller than the patch type. However, such a resistor divider can only measure the low frequency voltage of 1 MHz, and test the high frequency voltage above HF, the capacitance voltage dividing compensator must be set at the same time, otherwise the measurement result is not accurate. When the probe is small because the inner hole cannot be loaded, it is necessary to consider adding an attenuation shield box at the input plug, and can be installed in the 10: 1. In addition, in order to further reduce the interference of the outer stray electromagnetic field, a metal casing can be set outside the probe, the specific production method, and the reader can design it yourself.
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