Certain processes have intermittent events which cause high output levels, such as accelerometers producing high acceleration outputs for very short times. In certain situations it would be helpful to know what the peak output or acceleration was, and to get an approximate idea of the time of occurrence. This Peak Hold Unit captures the maximum signal levels regardless of the presence or absence of a trigger event.
In a data acquisition with say a one second sample interval the Peak Hold Unit allows the must faster events to be captured. Using two peak detectors, rapidly occuring signal peaks are captured and then saved until the data acquisition system can get to log those peaks.
This means that a 'slow' data acquisition system can capture events of millisecond duration.
Specifications:
One analogue input, two isolated analogue outputs.
DC supply required - 24 VDC, -5%, +10% at 100 mA max.
Typical step response time - less than 2 mS.
Split rail powered input circuit - input signals from ±100 V down to approx ±100 mV or ±100 mA down to approx ±100 µA. Standard process signal inputs available.
Input impedance standard at 100 kΩ but can be arranged to be 1 MΩ if required.
DC coupled input signal as standard but can be arranged to be AC coupled if required.
Analogue input resolution 0.3% of span.
Input sampling period, approximately 1 mS.
Input trimpot zero and span adjustments.
Galvanic isolation between input, power supply and outputs > 1000 VAC.
Split rail powered output circuit - output signals from ±12 V down to approx ±100 mV.
Output current for voltage output option at 5 mA maximum.
Output current range for current output option from 0 to 22 mA.
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