AD CONVERTERS:
Living in an analogue world
We live in an analogue world. All phenomena happen directly or indirectly in time domain.
Sensors measure events in these phenomena very accurately and almost instantaneously as a continuous function of time.
AD CONVERTERS:
Living in an analogue world
Computers live in a digital world. All peripherals that come after sensors in processing data measured are computer based. Hence the need to transfer from continuous (Analogue) to discrete (Digital) presents itself.
A device AD Converter (ADC) samples some discrete values at predetermined frequencies as shown below;
The continuous (Analogue) signal is represented with a green colored line while the discrete samples are indicated by the blue vertical lines.
In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal. A common example is the conversion of a sound wave (a continuous signal) to a sequence of samples (a discrete-time signal).
A sample is a value or set of values at a point in time. A sampler is a subsystem or operation that extracts samples from a continuous signal. A theoretical ideal sampler produces samples equivalent to the instantaneous value of the continuous signal at the desired points.
Successful sampling process allows the accurate retrieval of the original signal from the sequence of samples obtained.
This Month's SPECIALS
MODEL i100
Strain Gage Bridge Simulator
Our popular i100 hand held simulator generates precise mV/V signals to help develop, “troubleshoot,” and calibrate strain gage signal conditioners, instruments, signal processors, and data loggers.
Accuracy is ± 0.03%, temperature effects are 6 ppm/F, and zero balance is 0.0004 mV/V. Resistance of the i100 simulator is equivalent to a 350-ohm bridge. The i100 has 8 switch selectable output steps. Also, a Vernier knob is provided to allow the user to continuously adjust the output from –2 to + 2 mV/V. A convenient switch provides true reverse polarity. Connection to the i100 is made through either a PT style connector or 4 color-coded spring-loaded test clips. All critical internal contacts are gold plated. The i100 is compatible with AC carrier or DC strain gage signal conditioner electronics.
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