Electronic Restoration >> Smoke Damage Restoration For Electronics

In Figure 17, the dashed vertical line represents the typical DC leakage current limit for a 150µF, 6.3V device while the solid vertical line represents the limit for a tantalum polymer device. It's clear that one of these capacitors would not have met the MnO2 limit and Smoke Damage Restoration For Electronics several others are pretty close. This is typical for tantalum polymer capacitors from all manufacturers. 

Tantalum polymer capacitors generally have much higher leakage current than is true for comparable MnO2-based capacitors, Smoke Damage Restoration For Electronics and the median value of the distribution is usually closer to the catalog limit for tantalum polymer capacitors than is true for MnO2-based capacitors. Typical impedance and ESR data for a KEMET 330µF, 6.3V tantalum polymer capacitor appear in the swept-frequency plot of Figure 18. 

This plot was generated with the KEMET-Spice capacitor modeling program that is available without cost to customers. Similar software is available from other manufacturers as well. While the data of Figure 18 are not laboratory-measured data, Smoke Damage Restoration For Electronics they are remarkably similar to such laboratory-measured data.In addition to interactive graphs.

The software can provide numerical values for the discrete components ofan equivalent electronic circuit that behaves very much like the actual capacitors over a wide range of Smoke Damage Restoration For Electronics frequencies. These equivalent circuit models can then be incorporated into a larger computer models of acustomer's circuit to simulate expected capacitor behavior over wide ranges of frequency, temperature, andvoltage. 

These models are typically based on the RC-ladder structure that was schematically described in Figure 5. Generally speaking, Smoke Damage Restoration For Electronics there is little difference in the overall appearance of impedance and ESR graphs for tantalum polymer capacitors and MnO2-based tantalum capacitors, with the exception that the ESR is lower for the tantalum polymer capacitors at frequencies above roughly 1kHz. 

These lower ESR values reflectthe improved conductivity of the polymer cathode material. Near resonance, Smoke Damage Restoration For Electronics the impedance values for tantalum polymer capacitors are lower than for MnO2-based tantalum capacitors, reflecting the lower ESR. However, the impedance away from resonance is essentially similar for both polymer- and MnO2-cathode devices. 

The downward slope of the impedance curve priorto resonance is dominated by the capacitive reactance and Smoke Damage Restoration For Electronics the upward slope after resonance is dominated by inductive reactance. These parameters are similar for both capacitor styles. Figure 19 presents a comparison of the capacitance roll-off behavior of various styles of tantalum capacitors. 

It was stated earlier that less capacitance roll-off is observed Smoke Damage Restoration For Electronics at a given high frequency if theresistance values in the RC-ladder of Figure 5 are lower as would be the case for use of a conductivepolymer cathode having higher conductivity than MnO2. Less capacitance roll-off is also observed if the physical length of the ladder is shortened. 

This is analogous to reduced loss in a short transmission lineversus a longer transmission line fabricated from the same materials. Both of these concepts are validated by the data of Figure 19. The most poorly performing device is the single-anode MnO2-based capacitor which Smoke Damage Restoration For Electronics demonstrates initiation of roll-off slightly above 1kHz. 

If thesingle MnO2-based capacitor element is replaced by three very thin MnO2-based elements connected inparallel, Smoke Damage Restoration For Electronics significant roll-off doesn't occur until frequencies above 10kHz. This demonstrates the beneficialeffect of reducing the length of the RC-ladder structure by making the capacitor elements thinner.

The remaining curve demonstrates the superior performance that is achieved by combining the Smoke Damage Restoration For Electronics benefits of multiple thin capacitor elements with the conductivity enhancement provided by the conducting polymer.It is expected that a single-anode tantalum polymer device would have performed similarly to the multipleanode MnO2 device, but the multiple-anode tantalum polymer capacitor demonstrates clearly superiorperformance. 

For this capacitor, significant roll-off is postponed Smoke Damage Restoration For Electronics until frequencies well above 100kHz. Typical Dielectric Robustness Not all tantalum capacitors from a given lot have similar dielectric robustness. It is not unusual for thebreakdown voltages during rapid charging to vary over a range of 2:1 to 3:1 or more. 

Of course there is not much concern about the devices at the high end of the range, Smoke Damage Restoration For Electronics it is the relatively few at the low end of therange that cause almost all of the problems with turn-on failures.Figure 20 contains dielectric breakdown data collected on large samples of 220µF, 10V, MnO2-basedtantalum capacitors. 

There are 5 curves that represent statistical distributions of breakdown voltage whenlarge samples of capacitors from a randomized population were rapidly charged through various seriesresistances (the resistance includes the capacitor's ESR). Although not specifically pertinent to the topic athand, it is clear from the data that the breakdown voltages are significantly affected by the value of seriesresistance, Smoke Damage Restoration For Electronics this effect can be quantified, and higher series resistance leads to higher breakdown voltages.

For a value of total series resistance of 0.35Ω, Smoke Damage Restoration For Electronics it is seen that the breakdown voltages range from 8V to 26Vor 0.8 to 2.6 times rated voltage, a range of 3.25:1. This is fairly typical performance for MnO2-based tantalum capacitors. Had these capacitors been 100% surge current tested at full rated voltage duringproduction testing, probably none of the capacitors would have failed below rated voltage. 

This wouldhave tightened the range to 2.6:1. In contrast, Smoke Damage Restoration For Electronics Sanyo provided similarly-collected breakdown data for some 150µF, 10V tantalum polymercapacitors. These data appear in Figure 21 and are generally representative of 10V tantalum polymercapacitors.The external series resistance was 0.33Ω and it is estimated that the ESR of the capacitors was roughly 20mΩ. 

Thus the total series resistance was approximately 0.35Ω, the same total series resistance as wasused to generate the 0.35Ω MnO2-based curve of Figure 20. The range of breakdown voltages is 1.75 to 2.6 times rated voltage, Smoke Damage Restoration For Electronics or roughly 1.5:1. This is a much smaller spread of breakdown voltages than wasseen for the MnO2-based tantalum capacitors in Figure 20. 

It is common that the range of breakdownvoltages for tantalum polymer capacitors is smaller than observed for MnO2-based devices Smoke Damage Restoration For Electronics and that the firstbreakdown occurs at much higher voltage. The first significant observation is that both styles of capacitors had maximum breakdown voltage of 2.6 times rated voltage. 

While this exact agreement is probably coincidental, the similarity of the values is note worthy, Smoke Damage Restoration For Electronics and likely represents the existence of an upper limit to dielectric robustness that is related to the dielectric formation voltage (likely to be in the neighborhood of 3 times rated voltage).

Mold Removal Products

Molds are tiny microscopic organisms that digest organic matter and reproduce by releasing spores. Molds are a type of fungi and there are over 100,000 species. In nature, mold helps decompose or break-down leaves, wood and other plant debris. Molds become a problem when they go where they are not w  read more..

Lead Paint Exposure To Iron Workers

Field measurements using a tape measure of 12 of the cuts revealed that the paint was stripped back an average of 1.15 (range of 0.5 to 4.0 inches) inches from the cut line (based on 69 measurements taken). After hot cutting, Lead Paint Removal Lead Paint Exposure To Iron Workers burned paint provided visual evidence that stripping was insuffi  read more..

Leaking Shower Caused Wet Carpet

Molds are types of fungi that are found everywhere. Molds reproduce by means of tiny spores; the spores are invisible to the naked eye and float through outdoor and indoor air. Mold may begin growing indoors when mold spores land on Water Damage Leaking Shower Caused Wet Carpet surfaces that are wet. 

  read more..

Smoke Damage

The fire combustion process when wood is burned is never quite complete and the Odor Control Smoke Damage from a wood burnt fire usually will contain a dark brown or black substance which has a very unpleasant odor. This tar looking substance is called creosote and is found almost anywhere in a wood house fir  read more..

Methamphetamine Cleanup

Each week an average of 300 unlawful methamphetamine laboratories are found across the United States. After law enforcement intercede, a hazardous mess still remains. From cocaine to methamphetamine, each week an average of around 300 laboratories intended to make methamphetamines are found a  read more..

Lead Paint Removal Programs

Employers must instruct each physician not to reveal to the employer in writing or in any other way his or her findings, laboratory results, or diagnoses which are felt to be unrelated to occupational lead exposure. They must also instruct each physician to advise the employee of any occupationally   read more..

Flood Damage

When a flood passes through an area the damage that they can leave could be tremendous, if Electronic Restoration Flood Damage have entered a building containing state-of-the-art electronic equipment. These pieces of equipment will need to be thoroughly dried, gone through having all of the circuit boards and other electri  read more..

Put A Moisture Barrier In The Crawl Space Under A

To further separate the conditions in the crawl space from those of the outside, mechanical drying systems such as a stand-alone dehumidifier should be used (Dastur et al. 2005). All water discharge from appliances should be terminated to the outside or to a sealed sump. Crawl Space Drying Put A Moisture Barrier In The Crawl Space Under A All kitchen a  read more..

Odor Control

Say Tenant Move Out Cleanup Odor Control out and did not inform you and it's been a couple of weeks. In that time animals of moved in and started living in your rental. How do you get them out of the walls and attic now that they've taken up residence there. Call a professional restoration company dealing with animal remova  read more..

Lead Disclosure

All renters who live in Lead Paint Removal Lead Disclosure buildings that were built before 1978 must be provided two copies of the Tenant Lead Law Notification and Tenant Certification Form. If any of the following official papers exist for the rental, renters must also be provided a copy of those as well. Lead exam  read more..