Elenco Resistance Substitution Box | Resistance Range From 1Ω To 11, 111 , 110MΩ | 1% Precision: 1Ω-40kΩ- 1 Watt/ 100kΩ- 4MΩ- 1/2 Watt

Introduction: Diagnosing and troubleshooting complex HVAC systems, such as Trane rooftop units, requires precision and accuracy. The Elenco Resistance Substitution Box has gained recognition as an essential tool for HVAC technicians due to its versatility and effectiveness. In this review, we will explore the features, functionality, and benefits of the Elenco Resistance Substitution Box specifically for diagnosing Trane rooftop units. Design and Construction: The Elenco Resistance Substitution Box is built with a sturdy and durable design, making it suitable for the demanding conditions encountered during HVAC diagnostics. It features a compact and portable form factor, with clearly labeled resistance values for easy identification and selection. The box is engineered to withstand regular use and provides reliable performance over an extended period. Resistance Value Selection: The key advantage of the Elenco Resistance Substitution Box lies in its ability to provide a wide range of resistance values. This feature is particularly valuable when diagnosing Trane rooftop units, as it allows technicians to simulate various resistance levels and identify potential issues within the system. The box typically offers a comprehensive selection of resistance values, ensuring compatibility with the requirements of Trane units. Precision and Accuracy: Accurate measurement and substitution of resistances are critical in HVAC diagnostics. The Elenco Resistance Substitution Box excels in providing precise and reliable resistance values, enabling technicians to pinpoint problems accurately. Its high-quality resistors ensure minimal tolerance deviations, resulting in accurate simulations and effective troubleshooting of Trane rooftop units. Ease of Use: The Elenco Resistance Substitution Box is designed to facilitate ease of use, even for technicians with varying levels of experience. The resistance values are clearly labeled on the box, making it straightforward to select and substitute the desired resistance. The box is also equipped with user-friendly controls, allowing technicians to adjust resistance values with ease and efficiency during diagnostic procedures. Versatility and Compatibility: While the Elenco Resistance Substitution Box is highly effective for diagnosing Trane rooftop units, its versatility extends beyond this specific application. The box can be utilized for a wide range of HVAC systems and equipment, making it a valuable tool for technicians working in various settings. Its compatibility with different resistance requirements ensures its usefulness across different HVAC brands and models. Time and Cost Savings: The Elenco Resistance Substitution Box enables technicians to quickly identify and troubleshoot resistance-related issues within Trane rooftop units. By providing a systematic and efficient approach to diagnosis, the box helps reduce the time spent on identifying the root cause of problems. Consequently, it allows for prompt repairs or adjustments, minimizing system downtime and potential revenue loss for commercial or industrial facilities. Reliability and Durability: The Elenco Resistance Substitution Box is constructed with high-quality components that guarantee long-term reliability. It is built to withstand the rigors of daily use and can handle the demanding conditions encountered during HVAC diagnostics. Its durability ensures that technicians can rely on the box for consistent and accurate resistance measurements over time, making it a valuable and dependable tool in their toolkit. Customer Satisfaction: HVAC technicians who have used the Elenco Resistance Substitution Box for Trane rooftop unit diagnosis have expressed high levels of satisfaction. They appreciate its versatility, precision, and ease of use, highlighting its effectiveness in identifying resistance-related issues. The box's compatibility with a wide range of HVAC systems adds to its appeal, making it a worthwhile investment for professionals in the field. Conclusion: The Elenco Resistance Substitution Box stands as an invaluable tool for diagnosing Trane rooftop units and other HVAC systems. Its precise resistance values, ease of use, compatibility, and durability make it an ideal choice for technicians seeking to efficiently troubleshoot and identify resistance-related issues. By investing in the Elenco Resistance Substitution Box, HVAC professionals can streamline their diagnostic procedures

This is a really handy tool to have when needing to do some quick testing and makes figuring out required resistance very easy, and any amount of resistance between 1 ohm and 11 mega-ohms can be dialed in using 28 switches. The claim of 1% tolerance on the resistors inside is generally not an exaggeration. The numbers you get on an ACCURATE multimeter will generally be within spec with a single caveat: with all switches set to off you will still get about a .15 to .25 ohm reading depending on the probes being used. Basically what this means is on the very low ohm settings you will get somewhere between .2 to .4 added to the reading - in the case of mine when I measure 1-100 ohms I usually get about .3 or .4 added if using probes and about a .15 - to .2 when connected with good banana plugs. Once you pass 400 ohms this largely disappears, but just be weary that you need to subtract roughly .25 ohms off the actual reading you are getting in the very low resistance range. Simple math boys and girls - it's not the end of the world. I look at it as a 29th switch to test a multimeter on a very very low ohm resistance. The simple truth is all of decade boxes of this type do this - I have seen many variations of this design cost anywhere between 40 -110 dollars and all of them have the same general 0.25 ohms added without any switches engaged - this box is one of the cheapest and it's every bit as effective as other resistance boxes of this type that cost double or almost triple what this does. Being one of the cheaper versions of this type - this box is not the most strongly constructed in the world but as long as you take care of it - it will work fine. I'm not particularly thrilled by the quality of the banana connectors - but these could easily be replaced with better connectors. They seem to work fine, although I don't know how long they will last before needing to be replaced and/or re-soldered. Time will answer. The switches seem to be of fair quality but it probably would NOT be a good idea to get too rough with them. Overall this is a very useful tool for not a lot of money - I definitely would buy this unit again. I took off one star for the accuracy category because in all fairness the much more expensive (and much larger) decade boxes don't really have this problem. However it's not a deal breaker and certainly good enough for government work (and then some). Recommended.

I tested all switches out upon receipt, and everything worked. This is a low cost box, so it's using cheap slide switches that are all in series when shorting out each resistor that's not being added to the total resistance. That means the more switches that are down, the larger the number of switches in path, which adds a noticeable amount of resistance. The total resistance is going to be higher than just the indicated switch position value if you're only using it for a low number of ohms. If you're using it for low values (say less than 100 ohms), just know to put your ohm meter on it after you find the value that's working best, and see what it actually reads. Anything higher, and the switch contact resistance becomes negligible when added to the total resistance. One very minor annoyance is the layout of the front panel. Better designs put the higher values on the left, so the total resistance reads out in the same left-to-right number format that you would write it down in. So for example, 421 ohms would show the 4(00), 2(0), and 1 switches moved up on the right side. On this unit, you would instead flip switches 1, 2(0), and 4(00) in order on the left side of the unit. Not a huge problem to read the panel and add, it's just that laying it out the other way around would have cost nothing, and been a better way to do it, as many other vendors have chosen to do. Those are minor annoyances for a low cost, hobby grade unit like this. If you really needed better quality, you can get it for 5-10X this price or more in a strictly mechanical unit, or much more for precision or digital controlled options that are out there for professional needs. For my occasional needs at home, this did exactly what I required, and I can always check it with my DMM afterwards for the exact ohm value. Recommended for hobby and experimenters to get the job done without breaking the budget.

It's what I needed, it seems to be doing it's job well.

My device arrived today and checked it out in the lab. I used a DE-5000 LCR meter ( DE-5000 Handheld LCR Meter with accessories with Kelvin probes (which for some silly reason you have to make and can't buy premade), accurate to around 0.01 ohm, to measure it's DC resistance as I toggled each switch. The first thing I noticed is with the resistance set at 0, all switches off, the actual resistance was actually 0.23 ohm. Flipping the 1 ohm switch actually gave 1.23 ohms, a 23% error. The device is made by putting 28 resistors in series, and a switch to short across each one (off position is shorted). The end result is the resistance of 28 closed switches is 0.23 ohms, which is less than 0.01 per switch, about as expected. The resistors used are 1% tolerance, although due to the series switch resistance, values below 23 ohms will not be within 1%. The 1% tolerance variations will also accumulate, so the overall set resistance may or may not be within 1%. Assuming the resistors were exactly their marked values, setting 23 ohms would give 23 ohms + a bit less than 0.23 ohms series switch resistance, for an error of about 1%. A few pretty easy things could have been done for improved low resistance accuracy. Perhaps the easiest would have been to have one additional switch that shorted across a 0.77 ohm resistor, and marked as "1 ohm residual". A variation of this would be to have another terminal with the 0.77 ohm resistor, so if you used the "low resistance" terminals, it would start at 1 ohm plus the selected values. I'm guessing that the cost of one addition switch or terminal, and a 0.77 ohm resistor would not have made a significant price difference in the device. Still another option would have been to add 4 more switches, with 0.1/0.2/0.3/0.4 resistors, which would have allowed you to connect an external ohmmeter and null out the series switch resistance, also extending the range down to about 0.25 ohms, although 4 more switches and resistors would likely cost a bit more. Still, for a few bucks more, it could have been a much more accurate device at low values. For the price, this seems like a very decent device, unless low resistance accuracy is important to you. I personally think I'm going to drill a hole in the faceplate and add another terminal, with a 0.77 ohm (or 1 ohm adjustable) resistor to an existing terminal or maybe just buy a 0.75 ohm resistor like CLAROSTAT RW70UR750F RESISTOR .75 OHM 1 WATT 1% TOL. (Per Piece) (or six 4.7 ohm in parallel=0.78 ohm) and connect it in series when I care about low range accuracy, and know 1 ohm is the minimum resistance. Normal DVM's can't accurately measure much below 1 ohm anyway, so perhaps owning a meter than can measure in this range influences my expectation that 1 ohm at 1% should measure in the range 0.99/1.01, and on this device it measure 1.23 ohms. All resistance substitution boxes with switches will have some intrinsic switch resistance and since we don't have negative resistors, some strategy to account for this error is appropriate. Comparing this device to the much more expensive device like IET LABS RS-201 RESISTANCE DECADE BOX, 0 TO 9999999 OHM , if you read the spec sheet it says the "residual" resistance is <= 0.39 ohms (<= 0.056 ohm per decade). These more expensive devices look like they use a rotary switch per decade, so 7 decades is only 7 switches, vs the 28 switches in this device. If the switch resistance on those expensive devices is similar, then 1 ohm + 0.06 ohm switch resistance is still 6% off, for that other device that costs almost 10x as much. For less than the difference in price between this device, and the IET device, you can buy a Kelvin probe capable LCR meter, and build real Kelvin probes, and buy six 4.7 ohm resistors to compensate for the switch resistance for low resistances. Don't get me wrong, IET makes great products (like they sell my LCR meter). I'm not giving the Elenco Rs-500 five stars because I felt it's low resistance accuracy could have been much better at very little increase in cost.

I used this to simulate a temperature probe and calibrate the ADJUNC board on my Tuttnauer EZ-10 autoclave. It worked perfectly.

The Elenco RS-500 Resistor Substitution Box work as advertised. It is easy to set the resistor values for use in testing electronic circuits. In the box are two items: The resistor substitution box and an instruction manual. The resistor substitution box is actually smaller than the description indicates (7 x 5 x 3 inches). I measured its dimensions as 5.75 x 3.75” x 2 inches. The box is made of plastic and has four rubber feet on the bottom. The included instruction manual in English, which describes the device, its operation and components inside well. The resistors measured within 1% tolerance as described. The binding post connectors can accommodate spade lugs, bare wires and banana plugs. This latter feature makes it easy to use common “banana plug” cable for connections to test circuits. (See the photos which show me connecting my own banana plug cables to the box.) The resistors are set up with values in increasing value decades (1s, 10s, 100s, 1,000s 10,000s, 100,000s, and 1,000,000s) from left to right. The box may be set to any value from 0 Ohms to 11,111,110 Ohms. Resistor values are 1x, 2x, 3x, 4x which provide values from “0” to “10” of the decade by turning the slide switch(es) associated with the desired value(s) up to the “IN” position. (In any decade, “0” is all switches “OUT. To select any other value, turn switches to “IN” and add the values.) After a few minutes, I found it very easy to set any desired value for the substitution. In my testing, I was able to set resistor values for my testing and changed as needed for more testing quickly. Bottom Line: The Elena RS-500 resistor Substitution Box appears to be built well and it performs exactly as it is described.

This resistance box is almost essential if you’re servicing a piece of electronics that has a fried small resistor and you have no schematic. To use it, you start with high resistance placed in the circuit as substitute for the burnt component then reduce the substituted value until your device states working. If you have several burnt resistors-well ya might be screwed. Its always best to have a circuit schematic. Anyway, this box works pretty well for the price. I could have used heavier resistors in the box. At one point i detected smoke from the box. That means the resistors are too low on the wattage rating. Thats my one complaint on this box is - the resistor wattage needs to be Higher in value. But if course, thats more money. So ya get what ya pay for. All in all its a good value for the money. I recommend it IF you’re not working with high wattage requirements.

Works very well for diagnosis of wires in automobiles. I have used it for diagnisis of airbag wire, coolant temp sensor etc.

Often when calibrating a multimeter I need known resistances from 1 Ohm to 10 M Ohm and this provides an excellent fit for that requirement . It saves hours of faffing around measuring and sorting 1% resistors trying to get 6 digits of precision when the heat from your fingers can move the resistance by hundreds of counts. I use a 7.5 digit meter and set the required resistance using this box in a few seconds. It’s a real time saver and the accuracy of the resistances is closer to .1% than 1% which makes things easier.

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This is a smart device. I used to have one like this, self-made, but it took much more space. I found it useful in many different applications from vehicle troubleshooting to precision electronics projects.

Una manera fácil de hacer pruebas de resistencias y escoger el valor que se requiera