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PicoLog 1000 Series User's Guide
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Copyright © 2009 Pico Technology Ltd. All rights reserved.
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Glossary
Accuracy. The closeness between measured values and true values. This is more
usually expressed as the error, as a percentage of full scale, between the measured
value and the true value.
usually expressed as the error, as a percentage of full scale, between the measured
value and the true value.
ADC. Analog to Digital Converter. An ADC samples analog signals and converts them
to digital data for storage and processing. It is an essential component of a data
logger.
to digital data for storage and processing. It is an essential component of a data
logger.
Analog bandwidth. The range of input frequencies over which the measured signal
power is at least half its true value. This corresponds to a drop in amplitude of about
29%.
power is at least half its true value. This corresponds to a drop in amplitude of about
29%.
Duty cycle. For a square wave signal, the proportion of the time that the signal
spends at the high level divided by the period of the signal, expressed as a
percentage. Thus, a symmetrical square wave has a duty cycle of 50%.
spends at the high level divided by the period of the signal, expressed as a
percentage. Thus, a symmetrical square wave has a duty cycle of 50%.
Input impedance. The impedance of the input channels of the logger with the input
disconnected. Impedance is the total opposition (due to resistance, capacitance and
inductance) offered to the flow of an alternating current.
disconnected. Impedance is the total opposition (due to resistance, capacitance and
inductance) offered to the flow of an alternating current.
Linearity. The ideal output of an ADC is a linear function of its analog input.
Linearity is a measure of the worst-case deviation from this ideal characteristic.
Linearity is a measure of the worst-case deviation from this ideal characteristic.
Maximum sampling rate. A figure indicating the maximum number of samples the
ADC is capable of acquiring per second. Maximum sample rates are usually given in S/
s (samples per second.) The higher the sampling rate of the ADC, the more
accurately it can represent the high-frequency details in a signal.
ADC is capable of acquiring per second. Maximum sample rates are usually given in S/
s (samples per second.) The higher the sampling rate of the ADC, the more
accurately it can represent the high-frequency details in a signal.
Overload protection. The maximum voltage that can be applied across the inputs
of the ADC without causing damage to it.
of the ADC without causing damage to it.
PWM. Pulse-width modulation. A way of conveying analog information by means of
a single binary signal. The PWM output from the PicoLog 1000 Series units is a
square wave between 0 volts and +3.3 volts, with variable duty cycle. The average
voltage of the signal is the peak voltage, 3.3 volts, multiplied by the duty cycle. The
signal can be used to control proportional
a single binary signal. The PWM output from the PicoLog 1000 Series units is a
square wave between 0 volts and +3.3 volts, with variable duty cycle. The average
voltage of the signal is the peak voltage, 3.3 volts, multiplied by the duty cycle. The
signal can be used to control proportional
Resolution. A value, in bits, indicating the number of distinct input levels that the
can turn into digital values.
USB. Universal Serial Bus. This is a standard port that enables you to connect
external devices to PCs. A typical USB 1.1 port supports a data transfer rate of 12
megabits per second and is much faster than an RS-232 serial port. A full-speed USB
2.0 port operates at up to 480 megabits per second.
external devices to PCs. A typical USB 1.1 port supports a data transfer rate of 12
megabits per second and is much faster than an RS-232 serial port. A full-speed USB
2.0 port operates at up to 480 megabits per second.
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