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Questions tagged [instrumentation]

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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
48 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 ...
0
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2answers
18 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
436 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
48 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 ...
0
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2answers
30 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
51 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 ...
1
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3answers
187 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
91 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 ...
0
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1answer
78 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 ...
0
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1answer
85 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)...
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1answer
47 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
52 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
67 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
votes
1answer
42 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
59 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 ...
0
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1answer
248 views

Derivation of the transfer function of a instrumentation amplifier

I've just been really frustrated because I've been trying to understand this information online about how the transfer function of an instrumentation amplifier is derived. It would be really helpful ...
1
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3answers
331 views

Current Transformer (CT) and Potential Transformer (PT) Sensors - How to Measure Electrical Power Usage?

I am not from Electrical Engineering background and so, does not have much idea about how energy power meters work. I want to measure electrical power usage of a three-phase induction motor. So, I ...
1
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1answer
70 views

How to shield a battery powered instrumentation with USB interface?

I would like to ask for advice on shielding the following setup. I have a measurement target sitting inside a Faraday cage, connected through a shielded cable to a measurement circuit. The cable ...
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2answers
147 views

op amp DC gain drop

I got a really simple circuit, it is a voltage follower in cascade with an inverting amplifier. The input of the voltage follower is a current to voltage converter, measuring nanoamperes with a 1 M ...
0
votes
1answer
62 views

How to obtain current-voltage trace using a picoammeter?

I am designing a probe where ions will finally impinge a metallic collector. The collector is connected to a picoammeter to measure the collected current. How can I finally obtain a current-voltage ...
0
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2answers
106 views

Need help with instrumentation amp behaviour

I was wondering if someone could help me understand why this instrumentation amp isn't working the way I think it should. The amp is an INA155. My intention is that at if a voltage (positive or ...
0
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1answer
87 views

Higher Order Filters

I am designing a signal conditioning circuit to remove all frequency under 20Hz for some EMG measurement. I have several questions about the circuit design: For the instrumentation amplifier, should ...
3
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2answers
791 views

ECG circuit Pre amplifier

I am in the process of designing an ECG circuit to detect heartbeat abnormalities. I have two question regarding the AD8220 datasheet: What is the function of the 2.2pF, 10pF capacitor, 10k, 15k ...
0
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1answer
42 views

A question about max TTL input of a converter device

I have a programmable f/I converter which can be modified for various types of inputs and outputs. They have also a more detailed manual. I read them and learned how to configure and set this device. ...
1
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1answer
141 views

What does it actually mean by that a transducer has good dynamic response?

One of the basic requirements of a transducer is that it has good dynamic response. I am having trouble understanding the meaning. My textbook says: The output of the transducer should be faithful ...
0
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2answers
145 views

Proportional control of 0-12 V DC power source with 0-5 V DC analog signal

I am taking an instrumentation class and for our final project we are modeling a ventilated barn, to do this we want to vary the speed of a 12 V DC 0.35 Amp fan. To control the fan we are sending a 0-...
0
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2answers
30 views

Transmitter max output when checking ohms in parallel

To make my question simple and easy to understand I am giving an example below. I have an RTD (platinum 100) which change resistance with increase in temperature, for checking that rtd is showing ...
1
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2answers
227 views

Is there any analog meter with the needle capable of a full revolution?

Is there any analog meter with the needle capable of a full revolution? I have always seen only instruments where the needle can rotate only a fraction of 360 degrees, for example in the following ...
0
votes
3answers
426 views

Sensor with TTL digital output

I'm working with a position sensor (Correvit Aqua L-350 by the manufacturer Corrsys-Datron) that gives me 0 to 5 V pulses everytime a distance (which I can choose on its software) is swept. User ...
0
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1answer
82 views

A question about common mode voltage protection of a device

This datalogger manual has a warning about excessive commonmode voltage on its 5th page. ...data acquisition device you have purchased and are about to use is NOT an ISOLATED product. This means ...
3
votes
3answers
816 views

4 Wire Strain Gauge to 2 Wire Conversion/Connection

I have the WK-06-12BT-350 ohm WK125BT Strain gauge from Vishay the Gauge comes equipped with 4 wires ( High endurance lead wires). The following document describes a similar gauge: Strain Gauge is it ...
0
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0answers
220 views

Whats a N (+,N,-) terminal on battery connection to UPS?

We have a 3 phase ABB powerline series in our site, and we are installing it. In connecting external batteries to the UPS, 4 terminals are given +,N,- and PE. I understand +,- and PE, but for what "N"...
0
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1answer
178 views

LabView drivers for Keithley 6487. where to find documentation?

I have to set up a program for measuring the IV characteristics of some components using LabView. At the time of writing I'm studying the basics of the G language (LabView programming language) for ...
0
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0answers
477 views

Current Sensor Difference Amplifier

I am trying to use this equation for difference amplifier to sense a max current of 75 mA. However in my circuit I have no R4 so which equation should I use?
0
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1answer
126 views

Current Sensor Callibration

I want to measure a low current (from 0 to 75mA) using the attached schemtaic for ACS712. The ACS712 sensitivity is 185mv and I want to use the max gain of 47 to input vout to a microcontroller(0-...
0
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1answer
296 views

Relation between internal resistance and chosen scale on analog/digital voltmeter/ammeter

On Introductory Circuit Analysis of Boylestad I found out the following about the relation of internal resistance of a multimeter with the scale choosen on the instrument. Analog voltmeter: internal ...
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0answers
1k views

Drive a 50-Ohm load from a logic gate

I have a device that I'm trying to send a trigger too, it has a 50\$\Omega\$ termination and suggests a pulse between 2-5 volts, ~1\$\mu\$s width. The way things are set up, the trigger needs to come ...
1
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1answer
83 views

Conductivity monitoring to detect integrity loss of glass coating of steel

I have an application where the integrity of the glass lining of a glass coated steel vessel needs to be monitored. In theory, once the integrity is lost anywhere there ought to be contact between ...
3
votes
2answers
64 views

Instrumentation: Measurement Noise

I have a Tektronix DPO2014 and I'm trying to get a feel for what I can expect in terms of precision and accuracy performance on a clean and stable voltage. I'd like to be able to accurately and ...
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0answers
735 views

two opamp instrumentation amplifier

I was looking for some instrumentation amplifier, and I've been catched by this one: The part number is LT1002. In the caption it's written: Gain = R4/R3 * [1 + 1/2*(R2/R1 + R3/R4) + (R2+R3)/R5]. ...
0
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1answer
103 views

Is there a professional field/classification for people who do test-engineering?

Through my career so far, I have always done work involving developing software to test electronics. This has involved writing diagnostics in embedded C/C++ for ARM controller, and even such high ...
0
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2answers
270 views

Surge protection for control and instrumentation signals (C&I)

While studying Weidmuller's surge protection catalogue for control and instrumentation signals, I got really confused so that I can't easily explain my question.Is surge protection for analogue ...
3
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2answers
268 views

Active resistor for gain Control for reference pin in instrumentation op amp

I'm using an instrumentation amplifier (AD8421 from analog device) to amplify very small signals in magnitude from 20uV to 500uV max. the problem I have with this is that the signals might have some ...
0
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0answers
607 views

Strain Gauges Calculation and maximum life

EDITED: Following the mentioned datasheets in the comment I will post an explanation and some answers for correction. I am having trouble calculating, theoretically, the characteristics of a given ...
3
votes
2answers
494 views

Reading an Analog Voltage Waveform with a Programmable Scope

I am trying to automate the use of a Tektronix TBS 1052B digital oscilloscope in order to get the waveform for an analog voltage signal. Or in other words, get a number of voltage measurement samples ...
0
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2answers
412 views

Reading a number of voltage samples with Fluke 8845A

This question is for anyone familiar with Fluke's 884XA-series meters. I am looking to measure voltages with the Fluke 8845A meter. What I would like to do is measure a specified number of samples at ...
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2answers
271 views

Why does the regulated voltage go down?

I have designed this simple analog temperature transmitter. Specifically, this is a 2-wires loop-powered transmitter. The circuit is intended to measure temperatures from -50 to 400 °C. The first ...
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2answers
1k views

AD620: AC Input Generating DC Output

I've been using the AD620 to offset and scale up a tiny AC signal for my project. The AD620 is set up in the following way: Rg= 6.8kOhms (between pins 1 and 8) Vin = 0.123V rms AC signal (pins 2 and ...
0
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2answers
108 views

Technique to trigger oscilloscope on peak to peak value

I have a 4.5Khz bi-phasic square wave signal that ramps down from an amplitude of 20v peak to peak to 0v over 500ms. I would like to trigger in the middle of that amplitude ramp to 0v in order to zoom ...