Temperature is a property of a substance related to the amount of heat energy it contains.

learn more… | top users | synonyms

6
votes
5answers
573 views

Where is the cold junction on the commercial thermocouples?

According to all textbooks and articles, a thermocouple must have a cold junction somewhere on the middle of it. But none of the commercial products have a middle point or a marked spot for ...
0
votes
1answer
51 views

How to control the temperature of heating element

I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how ...
4
votes
2answers
68 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
2
votes
1answer
58 views

Implementing an Avalanche Photo Diode Circuit

I am working on a circuit that will make low light measurements in the visible range. The measurements will be of biological samples that are fluorescing. For this application an Avalanche Photo Diode ...
0
votes
0answers
46 views

How does temperature affect the performance of an SMPS?

I have an SMPS (laptop AC adapter) rated for 180 W that is presently operating at capacity. The output seems to be limited by internal resistance, but I can't really tell. I'm trying to get it ...
0
votes
1answer
28 views

High Energy Metal Halide Bulb Heat?

I am building a custom box from wood (around 14 inches by 10 inches by 10 inches) to encase 3 high energy Metal Halide Bulbs (400+ watt each). The box will be opened and closed intermittently, ...
0
votes
1answer
43 views

DH-11 Sensor on a Raspberry Pi & Arduino

I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit: ...
1
vote
2answers
86 views

How can I make the dimensioning of a temperature monitoring circuit?

I need to design a circuit to measure temperatures in the range 15-40 degrees C (this will later be the basis for a regulator of a peltier-element for a fridge). I tried a circuit using the ...
0
votes
0answers
27 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
1
vote
3answers
57 views

Could I use a surface mount thermistor to measure ambient temperature?

I'm working on a project where a device I'm using has this thermistor, a Murata NCP15WF104F03RC, to measure the temperature of the device itself. This is a surface mount thermistor. The implementation ...
0
votes
0answers
30 views

Does a Temperature + PPG integrated sensor exist?

I am trying to measure body's temperature and pulse from the ear (fitting sensors inside of earbuds). Does some kind of temp + PPG sensor exist? It would be great to reduce needed space. I could then ...
3
votes
2answers
217 views

Electronics can fail due to overheating, overvoltage, and mechanical stress. Are there other causes? [closed]

My experience with power electronics failures have generally fallen into three categories: overvoltage, overheating, or mechanical failures. Each might have manifold sub-causes, of course. ...
0
votes
0answers
22 views

What is the temperature vs time relationship for derating soldering iron dwell time?

Another question here involves someone using a 100 W iron to solder electronic components. This is much hotter than required, in my experience. The soldering specs for ICs are typically ...
-1
votes
2answers
51 views

Capacitors - аffected by temperature or not? [duplicate]

Are these capacitors аffected by the temperature changing or not? http://www.cde.com/resources/catalogs/TAS.pdf
0
votes
1answer
37 views

Temperature Coefficient of Capacitance

How can I find the Temperature Coefficient of Capacitance of the following capacitor series: http://www.cde.com/resources/catalogs/TAS.pdf
0
votes
1answer
29 views

How does cold weather affect the electronics

At Why exactly do chips start malfunctioning once they overheat? Sharptooth asked a very nice question about how does overheat affect electronics. That raised me the question of what does cold ...
2
votes
0answers
47 views

How are Operating Temperature Bands Determined?

Manufacturers like Maxim, Altera, and many more seem to adhere to a commonly defined range of temperatures for applications. For instance, Full military (-55°C to +125°C) Automotive (-40°C to ...
0
votes
2answers
158 views

STM32F103RB ADC (pics included) strange values for temperature sensor (LM35)

I've connected one battery/2 batteries (GND and A0) and the measuremet displayed on the com26 port is ok. I've connected the LM35 (The LM35 has 1 celsius degree for 10mV measured value) on the VCC and ...
0
votes
1answer
47 views

Temperature sensor slope explanation

I am looking at an accelerometer(data sheet is BMA280 ) which has capabilities of measuring temperature from -40 to 85 degrees celsius. It also specifies a Temperature Sensor Slope of 0.5K/LSB, where ...
0
votes
1answer
66 views

What is a single conductor temperature sensor called?

What is a conductive temperature probe called? They're relatively massy metal rods (5-8mm thick, 5-15cm long) that have a single conductor (NOT 2 conductor wire) to connect to the thermostat. The ...
1
vote
1answer
115 views

What is the formula for Nichrome

Having no knowledge of electricals, I am interested in learning the applications of Nichrome. I understand it has swg ratings. But what I am looking for is a formula that can calculate a particular ...
0
votes
1answer
49 views

Typical Resistance Temperature Coefficient Variance between a reel of same value resistors

I have a resistor divider, I'm interested calculating the drift of the divider over temperature and if possible minimizing it. I was wondering if both resistors in the divider have the same value ...
0
votes
0answers
43 views

IR temperature Sensor reading ambient temperature in a room

I bought a product that has a IR temperature sensor and I want to receive a "good quality" ambient reading of a room. I have an idea how to use the IR sensor for the ambient, even though it would be ...
1
vote
1answer
81 views

1-wire humidity sensor with ID

I've created a temperature monitoring system using multiple DS18B20 temperature sensors and now I want to add some humidity sensors to it. The problem is that I cant find any 1-wire humidity or ...
1
vote
1answer
73 views

Two transistor temperature sensor

Background I was considering making a temperature sensor from some NPN transistors. I read the Wikipedia page on Silicon Bandgap Temperature Sensors (can't use more than 2 links...) and this piece ...
0
votes
1answer
84 views

Anyone may suggest a temperature sensor technology that will work to a max of 200ºC?

Cheapest sensor technology as possible, up to +- 5ºC or 5% of accuracy. Better if it doesn't need complex (and costly) additional circuits.
0
votes
1answer
79 views

Temperatures for replacing BGA chip?

Newbie here who is going to try his hand at replacing a BGA chip on a laptop motherboard. I have ordered a new chip: NVIDIA G84-950-A2, and want to confirm some temperatures. Based on some ...
0
votes
0answers
47 views

Temperature Sensor Circuits problems (circuit and schematics pics included)

Just finished soldering this college project and tested for shorts with multimeter. All good in that region. The problem is the output at room temp is reading 3.5V ish which corresponds to over 40 ...
0
votes
3answers
106 views

RTD sensors and the mystery of Voltage Vs Current sources

Alright folks, I know there are a decent number of threads about RTD sensors (resistance thermometers. most associated with platinum type ones) Let me first assure you then hopefully show you that ...
0
votes
2answers
96 views

PT100 calibration

If I take (say) a class B PT100 sensor with a stated absolute accuracy of +/- 0.3 deg and calibrate it with a freezing/boiling chemical at (say) 50 deg will that make it inherently more accurate when ...
0
votes
0answers
33 views

DHT11 remote sensing — which resistor?

According to the DHT11 data sheet here: http://www.micropik.com/PDF/dht11.pdf, on wire runs longer than 20m, one should use a 'different' pull-up resistor from Data to VCC. What should the value be, ...
1
vote
1answer
86 views

What ppm/K correspondes to?

I have precision resistor 10 ohm and 5ppm/K. Does it mean that on delta 1K it will jump up/down 5 ppm of 1 ohm or 5ppm of resistor value - 10 ohms? I think that it corresponds to resistor value. But ...
0
votes
1answer
65 views

Temperature calibration for MCP9808 [closed]

Reading a lot, I have found nothing about calibration for the MCP9808. I have read the datasheet and understand that the chip converts the temperature to Celsius. The given accuracy in the datsheet is ...
0
votes
1answer
29 views

DS18B20 temperature interpretation

I have a problem interpretting the temperature reading of a DS18B20 chip. There is a certain situation I am not abble to resolve. This is the example temp table for the chip from the datasheet: an ...
1
vote
0answers
83 views

Microchip 9808 temperature sensor - Incorrect calculation result

I am using a Microchip MCP9808 I2C temperature sensor (https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-sensor-guide/overview). I'm having problems being able to calculate the ...
41
votes
9answers
6k views

Why do electronics have a low temperature limit?

Apart from condensation why do electronic components usually have a low temperature limit? For example my laptop says something along the lines of -10 °C to 75 °C temperature while in use. I can ...
0
votes
0answers
30 views

Average two probes

I have a MASH Tun that I have two 10 ohm thermoristor type temperature probes. THese have two wires (one a ground) I have a small PID (BCS 462) type device that used to be able to average the two ...
0
votes
0answers
194 views

Safe temperature range for 18650 battery - powerful flashlight

There are many powerful flashlights, some of them have just one 18650 li-ion cell, 10W LED and they are very small. I have read few tests, I watched few video tests on YouTube and looks like some ...
0
votes
1answer
74 views

Temperature compensation accelerometer and cross axis sensitivity calibration

I'm trying to compensate a 3-axis MEMS accelerometer for temperature. I can access a climate chamber where the device can be rotated in ONE axis. There is another place where I can rotate two axis, ...
0
votes
1answer
91 views

All capacitors leaking on Emotiva PSU? [closed]

I've just opened the top of my XPA-2 amplifier and had a huge surprise: it seems like almost ALL of the caps are leaking from the bottom. Not just the main PSU caps, but smaller ones on PSU PCB and ...
1
vote
3answers
135 views

How much power can a thin wire handle before heating too much?

If I have a copper wire 25um in diameter and 3mm long, and I'm running AC current through it at 3GHz, how can I calculate how much it heats up given a power and duration? The wire is immersed in oil ...
2
votes
1answer
82 views

How can I mount a DS18B20 tempreature sensor to a large heatsink?

I want to monitor the temperature of a large peltier element's heatsink to control a fan. I think I'm going to use a DS18B20. The 3 pin TO-92 looks like it's plastic, so I'm already worried about low ...
0
votes
2answers
112 views

Temperature Sensor Verilog

Hello I have been working on an analog temperature sensor TMP36 and I am trying to get the temperature and display it on the NEXYS3 SSD. I am aware the NEXYS3 does not have an analog pin and I built ...
0
votes
1answer
48 views

DS18B20 temp sensor IC

DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application. But in datasheet its mentioned that its ...
1
vote
1answer
88 views

PIC operating temperature… “industrial” vs. “extended”

I am shopping for a PIC micro-controller for use in an automotive application. I noticed that PICs are offered in both "industrial" and "extended" temperature ranges ([-40C to +85C] vs [-40 to +125]). ...
-1
votes
1answer
62 views

Digital temperature detector

I am using LM95071 temp detector IC for temp sensing. Link for datasheet: http://www.ti.com/lit/ds/snis137d/snis137d.pdf Its a digital temp detector, it will show equivalent ADC count. But where we ...
0
votes
0answers
93 views

temperature compensation circuit using AD8515

Can I use AD8515 op-amp as temperature compensation circuit for pressure sensor? The picture shows how I intend to use it.
0
votes
2answers
72 views

PT100 sampling and accuracy

How accurate can I get temperature measurements if I repeatedly sample the data from a PT100 sensor. [Assuming I have a 16 bit converter]? What are the limits on accuracy and repeatability? Does the ...
1
vote
2answers
86 views

LM1084, should I leave the copper area connected to the TAB floating? [duplicate]

I am using the LM1084 in a DDPAK package as a 5V USB voltage regulator on 4-layer board. The TAB of the package is internaly connected to pin 2 (OUTPUT). I am not sure what to do with the copper ...
1
vote
3answers
171 views

How to make the hottest CPU temperature?

Besides just running an infinite loop, are there any tricks (like maybe cache misses?) to making a CPU as hot as possible? This could be architecture specific or not.