The tag has no wiki summary.

learn more… | top users | synonyms

2
votes
0answers
76 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated ...
0
votes
2answers
106 views

Using a trimmer pot to output a percentage of voltage

I am trying to do a project where I am getting two (or more) voltages and averaging them all out. Then I would like to use a trimmer pot to adjust the voltage by a percentage, basically as a ...
1
vote
3answers
85 views

Calibrating the output voltage

I have a device which has a 16 bit D/A converter which through an analog linear circuit generates an output voltage between -1V and 1V. I have 32 of such channels on my device. simulate this ...
2
votes
0answers
248 views

How to calibrate a Kill A Watt meter and understand its hidden service menu [closed]

I found a hidden menu within the Kill A Watt P4400 meter, which is accessed by holding down the Volt and Hz buttons. Although I rendered my meter unable to measure accurately because of my futzing ...
2
votes
2answers
116 views

Calibration and trapping the CPU

The following code is meant for MSP430. Can somebody help me what is the purpose of trapping the CPU? How will the program proceed if the CPU is trapped there? ...
3
votes
2answers
627 views

Temperature compensation of LSM303DLHC accelerometer / magnetometer

ST Microelectronics makes the LSM303XXXX, a popular range of 3-axis accelerometer / magnetometer sensors that are used on Arduino breakout boards, etc. The older LSM303DLH sensor has been replaced ...
0
votes
0answers
60 views

neat ear detection of chirping and defective components

one more question for today. as told, we have complications regarding AC supplies (220volts) therefore all PSU units likely fail in several ways. most of them start chirping at some undetectable ...
4
votes
1answer
200 views

How to calibrate an optical particle sensor (Mie scattering)

I have a very simple sensor that basically emits infrared light (1 micron wavelength in the infrared range). The light scatters off particles whose diameter is of the same order of magnitude as the ...
7
votes
2answers
391 views

Where can I send my 0.005% 1 PPM tempco calibration resistors to find out their “true” value?

edit: putting this at the top because people keep answering questions I didn't ask: Where can I get this done cheaply by a place that is hobbyist friendly? I don't even know where to look. I imagine ...
1
vote
1answer
297 views

PIC18F26K80 ADC calibration using Bandgap

The PIC18F26K80 errata sheet mentions that the ADC has an offset error as high as 25 bits and discusses one workaround copied from the errata here: A/D Offset The A/D may have high offset error, up ...
1
vote
3answers
243 views

Does calibration involve fixing electronics or mechanical part?

My question is not 100% related to electronics design but it might be because I don't know the answer. I'm writing a simple research on anemometer calibration. The thing is all the resources I found ...
6
votes
1answer
103 views

Torque measurement device calibration

I don't know if I'm at the right place to ask this question but here is my trouble : I'm trying to find a good way of calibrating a electronic device used to measure small torques (0 -> 25 mNm). ...
0
votes
0answers
164 views

industrial water quality sensor, with analog 4-20 ma output. slope and zero point values?

Hello I have an industrial water quality sensor that measures chlorine. the sensor has an analog output of current (classic 4-20mA). The sensor is already calibrated and shows the right value of ...
4
votes
2answers
2k views

How to calculate a correction factor for two sensors

Suppose one has two sensors placed in the same environment (thus should be reading the same environmental data). But not being perfect instruments, there is a discrepancy between the two sets of ...
6
votes
2answers
442 views

How often should I have to set oscilloscope probe's capacitance?

I got a new Owon SDS7102 oscilloscope and I'm using the included oscilloscope probes with it. The manual says that the proper calibration procedure is to let the oscilloscope work at constant ...
9
votes
3answers
2k views

How do you Calibrate 32.768kHz crystal for PIC24 RTCC

I'm trying to figure out the best method for PIC24 RTCC crystal calibration. Their application note states two methods: using a lookup table and using a reference system clock. According to them the ...
1
vote
2answers
156 views

Calibration of reading of current measuring cicuit

Ok ,I'm making a small current meter device I was able to take the voltage coming from a "shunt resistance " which is a current transducer that gives me an specific analog signal that proportional to ...
8
votes
1answer
2k views

Magnetometer ∞ shaped calibration

In mobile phones and other devices using a 3-axis electronic compass, a ∞/8/S shaped movement is used to calibrate the magnetometer as shown in these videos. Why is this movement performed, what is ...
19
votes
2answers
3k views

Magnetometer dynamic calibration

I am working on a Magnetometer AK8975 being a part of an IMU. Which seems to be very tricky for me. This chip gives a 3D vector as output describing earth's magnetic field at any place on earth or ...
2
votes
2answers
1k views

Confusing oscilloscope calibration signal

EDIT: See last paragraph I recently got a cheap 2-channel oscilloscope (Hitachi V-212). Judging from the "calibration not required" sticker on the front, it's been beaten up and/or neglegted (by the ...
3
votes
2answers
786 views

Network Analyzer HP 8752A Calibration

How can I do a two-port response calibration to measure S-parameters (Reflection and Transmission) for an HP 8752A Network Analyzer? The DUT (two coils, one in air and one in salt-water) is ...
2
votes
1answer
165 views

Precision calibration tools

What "affordable" voltage and current calibrations tools are available? I'm specifically looking for Voltage (and preferably current) metering 0.05% Accuracy minimum (preferably 0.01%) 14 bit+ ...
5
votes
4answers
6k views

How to calibrate a temperature sensor

I am using an LM35 temperature sensor, which produces an output of 10.0 mV/°C. My circuit will handle temperatures up to around 90C What can I do to check the LM35 output, and maybe fine tune it for ...
2
votes
3answers
644 views

What Ways to Calibrate a Multimeter?

How can one calibrate a multimeter, like a UT61E or any other multimeter in the 50 ~200 $ pricemark, when one does NOT have an expensive FLUKE nor a friend who has a FLUKE)
7
votes
3answers
662 views

How viable is it to just use 1% resistors and calibrate out the error?

At the moment, I use 0.1% resistors to get accurate voltage measurement through a voltage divider. However, the cost is high, so I was thinking of using 0.5% or 1% resistors and calibrating out the ...
9
votes
2answers
1k views

How to calibrate multimeters?

Without buying an expensive calibration tool, how can I accurately calibrate my multimeters?