Questions tagged [error]

An error is the unwanted operation of an electrical / electronic component or system resulting from malfunctions. Use this tag if you have something that doesn't work as it should, or doesn't work at all.

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9
votes
2answers
909 views

Bad Measuring Equipment?

I was measuring the current through current mirror, when I experienced a problem. But first, I want to mention that I measured this with two ammeters of same manufacturer and same model (Mustool MT826 ...
7
votes
2answers
4k views

Why does my ATtiny13 report wrong device ID?

I am using an Arduino (with ATmega168) as an ISP programmer to program ATtiny13. When I try to do this, avrdude reports: ...
7
votes
2answers
4k views

Accelerometer double integration error

I wanted to use an accelerometer or IMU to measure speed and displacement over a period of about 1 minute or 400m. From this answer I found at stackoverflow, the error propagates at a rate of \$t^2\$ (...
7
votes
1answer
1k views

Occasionally the first byte of data from an SD card SPI read is bad

The device I am developing is an SD card storage add-on to a retro computer, SanDisk Ultra II 1.0 GB SD card in an SD card socket (I have no idea if the brand is significant, it just happens to ...
6
votes
2answers
972 views

What does m% stand for?

What does m% mean? Like in this datasheet from TI at the gain error graphs: http://www.ti.com/lit/ds/symlink/ina149-ep.pdf?&ts=1589388038122 Is it supposed to mean per-cent-mille (10^-5) or per-...
6
votes
2answers
3k views

Green LED: Forward Voltage

Yesterday in lab, we were asked why all of our green LED had large forward voltage than expected. We expected for the forward voltage to be at around 2.1V as according to hf=Egap=eV. Yet, we ...
6
votes
1answer
490 views

DAC to ADC errors

I am testing my setup of MCP4725 DAC connected to MCP3221 ADC. DAC's output is connected to ADC's input. I'm measuring the difference between set values in DAC and measured values in ADC and I'm ...
6
votes
1answer
136 views

Why is the verification of Thevenin's theorem more accurate than that of Superposition theorem?

In my first course on Electrical Engineering, we have an experiment in the Electrical lab that asks us to verify the Thevenin theorem and the Superposition theorem and cross-check our results with our ...
5
votes
3answers
3k views

How to compensate gain and offset errors

I have an analog circuit which has an offset error as well as an gain error. I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <...
5
votes
1answer
498 views

What is the typical RMS noise of a lithium battery?

Take a typical CR2032 battery, if it is not discharging, what is the typical variation in voltage over a short period of time (eg a few seconds or minutes)?
5
votes
2answers
509 views

Why have apparent memory bitflips in non-ECC memory not increased?

Back in the early 2000s I remember asking about why it was so important that servers use ECC memory. The prevailing wisdom at the time was that systems with lots of RAM would be, statistically, more ...
5
votes
3answers
300 views

Problem loading sketch to arduino MiniQ

This is the first time I have used this product (an Arduino-compatible robot) and I'm having some trouble. I've done this on 2 different boards now. I select the serial port, load up the blink sketch....
5
votes
1answer
1k views

How to null op-amp offset in current source?

I have a current source circuit with an op amp and pass transistor. The simplified schematic is this: simulate this circuit – Schematic created using CircuitLab I would like the output to be ...
4
votes
2answers
4k views

Altium error: Open emitter pin and power pin object!

I am new with Altium Designer. I receive the following error: (+12V contains Open emitter pin and power pin object!) Here is the error schematic part: The error is in Pin 4. Any TIPS?
4
votes
3answers
8k views

ICD3err0045 - PIC16F819 Programming

After posting: Programming/Debugging with ICD3 and PIC16F819-I/P I'm still getting the MPLAB error: ICD3Err0045 - You must connect a target device to use MPLAB ICD 3 My Setup (pinout and wireup): ...
4
votes
2answers
3k views

Altium error: Un-connected Pin Constraint

I have a pad in a IC left unconnected. I have set No ERC on that pin in the schematics to suppress of all violations. But I still get "Un-connected Pin Constraint" error in PCB. How can I suppress ...
3
votes
2answers
1k views

How to solve Keil compiler 'Error: L6218E: Undefined symbol' on STM32

I am trying to run a simple tutorial (external interrupt example) on my NUCLEO-F746ZG board. I use STM32CubeMx software version 5.2.0 and Keil software version 5.28.0.0 as compiler. I get the ...
3
votes
1answer
17k views

LTspice “could not open library file” for a third party amplifier

I'm trying to use INA129 in LTspice. So first in TI's page I go to Tools & software and under the model download the file called: INA129 PSpice Model (Rev. B).zip In this zip file there are files ...
3
votes
2answers
729 views

How do I measure the error of my ohmmeter

I have to do an Ohmimetro to a college assignment, but I don't know how discover the measure error of my circuit. When we buy a multimeter, the equipment has a measure error calculated by the ...
3
votes
2answers
2k views

How to ensure data integrity when using I2C with a PIC

When master device transfers a piece of data, slave will acknowledge back once the data has been received by slave. So it's not possible to ensure the data integrity by only polling ACK. I ...
3
votes
4answers
1k views

Non-linear error in ADC readings

I am measuring voltages up to 20V with my ATmega2650 MCU (10-bit ADC). I'm using 5V precision voltage reference (LT1021 - 0.05%). Voltage dividers are setup with 1% Panasonic resistors. Vcc->10kOhm-...
3
votes
2answers
3k views

DC-DC boost converter not working as it should

I have been experimenting with DC-DC boost converter design. After I made some calculations in order to obtain a certain output based on certain parameters, I tested the SMPS and saw that it's not ...
3
votes
1answer
3k views

The timing-driven placement phase encountered an error

Could someone explain inexperienced VHDL coder what this error message trying to tell me in simple words? I found a similar question here, but here was no answer to it: ...
3
votes
1answer
1k views

PIC datasheet is unclear on clearing framing error

On the PIC16F1829, FERR reflect the framing error status of the top byte in the two byte serial receive FIFO. Thus, assuming no new bytes arriving with framing ...
3
votes
1answer
127 views

Altium - Change Color of Error Text in HUD

I had this set up on my PC a few weeks ago but lost it when I had to switch computers. I am trying to remember how to change the color of the Online DRC Errors shown in the HUD when hovering over the ...
3
votes
1answer
127 views

VHDL Aggregate on Left Side of Assignment : Error in Simulator

I'm designing a counter with a combinational carry out (not registered). To do this I have a concurrent assignment to create the unregistered sum with carry by extending the unsigned input before ...
3
votes
1answer
106 views

ADC issue - possible non-monotonicity?

My ADC (two of them under test - the Analog Devices AD7676, and the Maxim MAX11108) is a 3 Ms/S SAR. The device is powered and referenced by a precision 3.3V reference device (100mA max). The ...
3
votes
1answer
7k views

How to measure power factor cos phi with an Arduino?

according to How does one measure the power factor? I can measure the power factor (cos phi) by comparing the zero point crossing of Voltage and Current. This is clear. The problem I have is what if ...
3
votes
2answers
9k views

error: avrdude: stk500_getsync(): not in sync: resp=0x00

I'm new in this field and I'm working with ardupilot APM 1 (atmega1280), and I got this error: avrdude: stk500_getsync(): not in sync: resp=0x00 while I was uploading. I've read so many articles ...
3
votes
3answers
5k views

Why does this 7905 giving -12V output?

I made myself a symmetric power supply for my lab projects using several 78xx and 79xx components. The PCB was ready and I was testing it. I saw that 7905 is giving -12V output. (See full image.) (...
3
votes
3answers
766 views

Approximation of a Non Ideal Differentiator

simulate this circuit – Schematic created using CircuitLab The above circuit is a differentiator, the op amp is assumed to be a single pole op amp, that is \$ A=\frac{wt}{s}\$ The transfer ...
2
votes
2answers
1k views

Why is my basic DAC incorrect?

I tried to make a basic R2R digital to analog converter in a simulator. Even with all bits set, I get an output of 4.98V rather than the 5V I would expect. I expected 5V since so many online resources ...
2
votes
1answer
2k views

The CAN bus in this vehicle has only one 120 ohm termination resistance. What problems would this provoke?

This vehicle that I've started co-developing is designed with only a 120 termination resistor on the CAN bus. Obviously there should be two of those resistors on two ends of the bus. I will be making ...
2
votes
2answers
298 views

Connecting Custom Metric Part in Eagle

I made a custom library for a 1x3 header with 5mm pitch on Cadsoft Eagle. Since I had to make the pins in metric, I'm having an issue now connected to the 0.1 inch grid that the rest of my schematic ...
2
votes
1answer
2k views

PSPICE - must be 'I' or 'V' error

I'm trying to make a super simple circuit simulation for a class, and I keep getting the same error: ERROR -- Must be 'I' or 'V' Here's the whole log: ...
2
votes
3answers
1k views

getting error from for loops in vhdl

Hi I am trying to use 2 nested for loops in vhdl but I get this error. [Synth 8-561] range expression could not be resolved to a constant [318] I do not understand why this code is not working since ...
2
votes
1answer
1k views

Altium: Rules and Query syntax

I want to set some rules for certain components. These rules are in the minimum solder mask sliver however I'm stuck on the query. So far I've written ...
2
votes
2answers
2k views

How does wiring resistors in series and parallel affect their errors?

In an experiment I am conducting, I am trying to measure low currents by wiring a radio device in series with a small-resistance resistor setup, composed of 9 of 1 ohm +/- 5% resistors in series and ...
2
votes
1answer
3k views

LTSpice divergence between AC analysis and transient analysis for low frequency gain

A simulation is done in LTSpice (version 4.23k) There is an inverter: Fig.1: schematic 1mV small-signal input. AC analysis is run. Low frequency gain (Vout/Vin) is 20.69 dB (10.82 times). ...
2
votes
2answers
366 views

Error reading data through UART using peripheral library in PIC32?

I am trying to receive data using UART. I am using PIC32MX795F512L Micro Controller and using 32 bit peripheral library, so I using functions like putsUART or ReadUART1 Now in the code : ...
2
votes
2answers
45 views

Random Error Waiting Time

Suppose that you have a design that has had an error after running 14, 18, and 20 hours. You're not exactly sure what is causing the error, but you make a change to the design that MIGHT fix it. ...
2
votes
1answer
2k views

Error setting up timer HAL PeriodElapsed Callback STM32F334R8T

I'm trying to create a microsecond delay function using the STMs regular timer. I wanted to set a timer to fire an interrupt every microsecond and then increment a variable in the call back function ...
2
votes
2answers
44 views

Systematic high frequency error in TF measurements

Full disclosure, I've asked a very similar question before which didn't have much success as it was too specific. However I want to try again by restricting the scope of the question. Scenario I'm ...
2
votes
1answer
2k views

Altium error: Net contains multiple output sheet entries

I'm having a hard time with this problem and cannot figure out how to deal with it. As shown in the figure below, ADC[0..2] is going out from A2 and A3 and in to A1: In details: ADC 0 is the ...
2
votes
3answers
952 views

Can probing an EEPROM with a multimeter corrupt the data?

Say there's an EEPROM on a board and you happen to try probing the pin one by one with a multimeter, is there a good chance that the sequence of probing the pins must have overwritten (thus corrupt) ...
2
votes
1answer
2k views

STM32f2xx could not work with maximum frequency

I'm using default configuration (according to UM1061, RCC section) to configure an SMT32F215RG to work with 120MHZ CPU clock. here is my configurations: ...
2
votes
1answer
91 views

Error Amplifier Gain

I was studying the "SG3525" IC and its functions, and I encountered this issue: In the "Error Amplifier" section of the Datasheet, there is a parameter that named "DC trans-conductance" which it is "...
2
votes
1answer
65 views

J-Link programmer in Windows 8 don't work

I use the J-Link programmer in Windows 8. A few days ago, my programmer hanged and the LEDs stayed silent, and I, with the help of the Internet, was again using the SAM-BA software to install the ...
2
votes
2answers
315 views

Altium - Back-Annotation Error

I have re-annotated PCBs and back-annotated the schematics countless times before and never saw this problem. I first make sure that my PCB and my schematic are synchronized and up-to-date. In the ...
2
votes
1answer
732 views

LTSpice: “Can't expand empty subcircuit” error with HC4046 Model

I downloaded the symbol and model for the HC4046 Phase-Locked Loop chip from the Yahoo LTSpice group here: https://groups.yahoo.com/neo/groups/LTspice/files/%20Lib/CD4046/Others%20CD4046/ (You will ...

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