Questions tagged [instrumentation]

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37 views

What is the reason behind different pot resistance in such instruments?

Is there any advantage of using 10k vane to 1k or vice versa? An example of such instruments: https://www.windspeed.co.uk/ws/index.php?option=displaypage&Itemid=59&op=page&SubMenu=
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0answers
11 views

Reducing errors in 3-wire PT100 RTD measurement using a Keysight 34461A DMM

I have a 3-wire PT100 RTD with 1.5 m long cables, which I want to measure with a Keysight 34461A DMM. This DMM has a temperature measurement mode for use with RTDs. Aside from bundled probes, I have ...
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0answers
31 views

Potential issues with mounting tiny PCB directly to piezo transducer?

I am designing a very small signal conditioning daughterboard with the intent of mounting it directly underneath a cylindrical piezoelectric force device/"sensor" to rectify and filter the ...
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1answer
39 views

What is RF switch used for in a lab equipment? [closed]

I'm only familiar with scopes, DMMs and a little spectrum analyzers. But I couldn't understand what an "RF switch" is used for particularly in a characterization lab. Can you give an example of its ...
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2answers
76 views

4 - 20 ma current loop, Short circuit isolator

I am trying to design a short circuit isolator, for 4 - 20 ma current loop based intruder alarm system.The below system,identify short circuit in sensing line and sensor activation(closing 1 k in line)...
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2answers
49 views

How are in practice input output impedance measured of a prototype circuit?

When an analogue circuit like an audio IC or an ADC for instance is implemented, is there a dedicated instrument/device which measure the input output impedance of the circuit or one has to perform ...
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3answers
309 views

A question about instrumentation

I have a 1kN force transducer which can output (through an amplifier) +/-10V for +/-1kN nominal force range and I sample it with a DAQ device which is 24-bit and has +/-10V range. The overall noise ...
5
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2answers
58 views

Gain-Phase measurement without dedicated equipment

I was wondering if it is possible to make Gain-Phase measurements without dedicated equipment like the venerable HP4194A or a more modern Bode 100. As far as I understand, a Gain-Phase analyser is a ...
1
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1answer
37 views

How to do multichannel ADC data logging

I need to build a system to monitor several (around ~20) voltages over several days. The ~20 voltages need to be measured differentially. Something which could in theory be accomplishes with 3 of ...
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0answers
13 views

Inamp to Measure LiFePO4 Battery Voltage

I know there are a few posts regarding the best way to measure battery voltage but I didn't see any that were focused on the most precise method possible. I am designing a battery analyzer to measure ...
3
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1answer
38 views

Is there some kind of standard of modbus input register?

As the title said, based on your experience, is there a such thing? If no, which are the most commonly used? for example in a sensor, the input registers as follows: ...
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0answers
21 views

Error Propagation and Analysis on a experiment due to Voltmeter Constraints

I got a situation: at the moment I am unable to access both channels for Keithley 2182A nanovoltmeter using LabVIEW. However, for some odd reason, while I cannot access the channels at once, LabVIEW ...
2
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1answer
40 views

Error Analysis due to Voltmeter Constraints

I got a situation: at the moment I am unable to access both channels for Keithley 2182A nanovoltmeter using LabVIEW. However, for some odd reason, while I cannot access the channels at once, LabVIEW ...
1
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0answers
35 views

How to read instrument's range graph

I have an Agilent 4980 LCR meter and in its manual it has several graphs indicating the effective measurement ranges for each scale, like the one below: How to read such a graph to be sure that the ...
2
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5answers
298 views

Choosing a digital oscilloscope for a self learner [closed]

I'm about to start a course about electronic interfaces. My intention is to learn to debug hardware by doing measurements etc. with oscilloscopes and multimeters. According to the course, the ...
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2answers
93 views

exceeding an analog ammeter printed scale

I have a ~$10 DC ammeter I mail ordered however long ago, on the display is printed Dagatron 7203 and on the lower right side of display is an upside down U ...
19
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13answers
8k views

Why only sine waves?

I have already read a few EE texts where a sine wave is often seen. Why is the sine wave often used as a test function for a circuit or a system? Why don't we use any other signal instead of sine? ...
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0answers
24 views

Can these SPICE models be used to compare single ended versus 4-20mA current signals?

I want to compare the environmental or common mode interference effect to current vs voltage signals by using two different transducer types current and voltage respectively. Below I compare two ...
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2answers
60 views

Instrumentation Amplifier Reference Node - Integrator vs Buffer

When looking at INA topologies (lets take AD8220 for example) I see examples of integrator or buffered resistor dividers used. What are the disadvantages of using an integrator? Both typologies ...
7
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1answer
176 views

Purpose of resistor across op-amp inputs

The following (from TI app note slaa414a) is an active bias-T that sums the AC and DC inputs to drive a load for the purpose of testing PSRR. What does the 100 Ohm resistor across the inputs do? Both ...
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1answer
48 views

How to obtain a high precision mV signal within a specific interval using a variable resistor?

I want to design a circuit which outputs a signal ranging from 0-70 mV using a variable resistor ranging from 80.51 Ohm - 183.05 Ohm and a supply voltage of 12 V. My idea so far has been to make a ...
2
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2answers
49 views

Questions regarding DC-DC converters powering transducers

Several of these transducers requires isolation as recommended here in their manual: The transducer models are uni-polar 0-10V output which require 24VDC power supplies. So at the moment there is a ...
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1answer
38 views

polarised condensor microphone

Sir/Madam, Kindly explain how is the following equation derived for the polarised condenser microphone? The output voltage V0 fed from the microphone to the preamplifier will be how is it derived? ...
2
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1answer
101 views

How to extract the switching noise component for this signal data?

A servo accelerometer when powered by batteries has a clean output, but when used with this SMPS supply its output seems like have switching artifacts from the power supply(the datasheet says its ...
1
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1answer
58 views

measuring ac voltage drop across a resistor with a solenoid in series with it

I wanted to measure the phase difference between the current (magnetic field due to the solenoid) and the system response. I am doing this by measuring the voltage drop across the resistor in series ...
-1
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1answer
43 views

Custom Test Fixture for LCR meter

I've designed and built a custom test fixture (based on Keysight's 16047A) to be able to measure multiple pin capacitors. When testing it to compare both fixtures (the custom and the original), I ...
1
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1answer
161 views

Instrumentation Amplifier Connection Problem

I am trying to build a circuit capable of measuring ECG signals following the scheme attached. Since AD623 was out of stock, i ended up buying something like this: https://www.arduino-tech.com/cjmcu-...
3
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3answers
135 views

Microvolt to milivolt/volt amplifier with common components

Suppose one has access to common components and gear only : basic milivolt multimeter, badly regulated supply, linear regulators, 1% resistors, common BJT/FET, voltage references like LM431 or zener ...
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0answers
174 views

measure 4-20 mA and also power from loop powered

we know to give a command to an actuator in instrumentation we use 4-20 mA loop power. for reading this 4-20 mA I used the circuit below.so the problem is if my circuit only consumes 3mA, how should ...
1
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1answer
32 views

Measurement range versus calibration in electronic instrumentation

I need to monitor temperature between -15°C and +40°C. The transducer(Pt100 probe and R/I transmitter) can measure between -25°C to 72°C. But I need the temperature transducer to be calibrated by an ...
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1answer
112 views

Definition of \$ \frac{mm}{Ampere}\$ (unit of current sensitivity)?

I want to know how \$ \frac{mm}{Ampere}\$ (which is the unit of current sensitivity of PMMC instruments) is defined? i.e, How \$ mm \$ is defined in terms of \$ degrees\$ ? For eg.: \$ \frac{rad}{...
0
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1answer
99 views

Questions about grounding points for an analog signal transmission

I'm planning to implement the following circuit I have drawn. But because there is no SPICE for such components I couldn't verify or test any overall workings. From left to right I will first ...
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2answers
298 views

Using a fully differential amplifier as a differential ADC driver

Regarding my previous question, I decided to use a “fully differential amplifier” to obtain a voltage gain of 10. The source and ADC are also differential. The source is unipolar and its output ...
0
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2answers
42 views

measuring resistance on hv transformer

I need to verify the resistance on a HV transformer that receives 208v single phase through terminal 1 and 2, or 240v through terminal 1 and 3 and delivers 4000v through terminal 4. As per the ...
5
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4answers
1k views

Why do LCR meter manufacturers give the details of measurement frequency to us?

When you want to purchase a DMM, more probably you don't see at what frequency the DMM you considered would work, but in the situation you're considering to purchase an LCR meter, manufacturers give ...
1
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2answers
78 views

Problem understanding impedance measurement device accuracy format

I am reading the datasheet of an impedance measurement device. Its accuracy is listed as '±0.4% rdg. ±8 dgt.'. What does 'rdg.' and 'dgt.' mean? And how should I interpret the accuracy? The device is ...
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2answers
55 views

Signal response and settling time graph analysis

I have come across a datasheet of an instrumentation amplifier. I have a difficulty in understanding the signal response vs settling time graphs. Can someone please explain figure 28(page 10) of the ...
4
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3answers
460 views

How to make repeatable Op-amp amplifier circuit

I did a simple op-amp based 100X gain single ended circuit. I tried to order 100 IC's and manufactured them. But found that out of 100 only 60 devices have same and expected baseline. What could be ...
0
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1answer
86 views

Trouble with instrumentation and simulation of the common-mode response of a filter

I have been struggling to obtain the Bode plot of common-mode response of a filter. I first simulated it using LTspice, then I used a USB network analyzer. Both do not match each other and to the ...
1
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2answers
1k views

For SCPI programming in python, Is it necessary to install a NI-VISA back-end if you are trying to iterface with a non-National Instruments device? [closed]

[background/context] hello, I am trying to learn to automate measurement devices using SCPI commands, but instead of using Labview I decided to go with python. I have played around with SCPI commands ...
0
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2answers
83 views

Appearing voltage when connecting different grounds

We have designed instrumentation equipment. When several instrumentation units are connected their grounds must be connected. The first proposal was to connect the GNDs by cascade topology. But we ...
2
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3answers
2k views

LM324 instrumentation amplifier gain and offset problem

I want to translate a Pt100 RTD to a 0-10V range, to be read by a PLC. I designed a circuit (instrumentation amplifier) using the LM324 op-amp. It is powered using a single 12V supply.The resistor ...
0
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1answer
392 views

How does the Zoom ADC exactly zoom in (Practically)?

I am trying to understand the actual working of this specific Zoom ADC (diagram below), which is a 2-Step ADC with coarse (SAR) ADC and a fine (Sigma-Delta) ADC. I understand it theoritically but ...
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0answers
318 views

Measuring current using ACS 712 with NI DAQ 9215

I am trying to measure current from Ignition coil(12V, 4.5A). i used arduino to measure current. And it worked good. And i connected the ACS712 signal pin to NI DAQ 9215. At zero current the output ...
1
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1answer
511 views

Problem encountered while amplifying load cell signal with LM358

I have an S-type load cell to measure weight up to 100 Kg. Its datasheet mentions 3mV/V against full range and excitation voltage. When no weight is applied, the voltage is 9.9 mV (Excitation is 10 V)...
1
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1answer
54 views

Using a scope for an instrumentation and mains earth

When I make a measurement using a scope and observe transducer voltage output on the scope screen, I want to eliminate the noise as much as possible which is due to device and scope coupling or common ...
1
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1answer
67 views

UPS for 1.1kW system [closed]

We have 3 motors each 0.37kW, they are now running on mains power, sometimes mains power cutoffs/fails, in that case we want the motors keep running. The motors are controlled by a PLC which do not ...
0
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3answers
86 views

How to measure tilt on a dynamic device?

I'm trying to instrument a vehicle component. I want to measure a component's angle during a drive cycle. The component has a single degree of freedom, it has a fixed axis. I'm trying to figure out ...
0
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1answer
53 views

Testing short in circuit

I think it is a very simple test to perform, but I do not know the correct equipment for this. I just have a basic LED circuit, resistor before LED, but I want to test a short in parallel with the ...
1
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0answers
60 views

How to measure gasoline:oil ratio for 2-stroke motor?

For some reason I am obsessed with instrumenting my small fishing boat. I'd like to have a continuous measurement of the gasoline:oil ratio in both my main (70HP) motor and kicker (7.5HP); I have a ...