"The ShockLog™ recorder is based on a high performance low power microprocessor with 32k bytes of internal program flash memory and 2M bytes of external flash memory for data storage. 128 k bytes of external Ram memory are used to buffer data before storing it in the non-volatile flash memory.
When it is operating, the processor uses too much power to give a satisfactory battery life so it is kept in a low power sleep mode as much as possible. A very low power clock chip keeps track of the time and date and wakes the processor once every second. The processor wakes up to perform various housekeeping tasks due to these regular alarm calls and returns to sleep again as quickly as possible. The basic housekeeping tasks are:
every second keep track of time
every 5 seconds flash LEDs, read and reset peak hold circuits
every 10 seconds possibly update time slots, transmit monitor message, possibly attach to a PC and do RMS readings
every 1 minute read external humidity, pressure and temperature sensor (if fitted)
every 10 minutes check internal temperature, re-calibrate, and possibly update summary
The primary sensors for the ShockLog™ recorder are its three built-in piezo electric accelerometers. The signals from these are amplified and filtered by several analogue circuits that must remain powered all the time. These analogue circuits are configured by the processor to have the correct gain and response for the ShockLog™ recorder setup chosen by the user. Their outputs are routed to a multi-channel Analogue to Digital converter in the microprocessor. The amplified and filtered signals from all three accelerometers as well as the signal from the external input on connector B is compared with a threshold level (the wake threshold). If the threshold is exceeded the processor will be woken up and will start monitoring the signal levels at the rate of 4096 samples per second. If the level of any of the signals exceeds the warning or alarm thresholds, (and various other conditions are satisfied), the ShockLog™ recorder will start recording an Event.
The processed analogue acceleration signals are also routed to an analogue peak hold system which stores the largest signal seen on each accelerometer. This peak hold system is measured and cleared by the processor every 5 seconds and the data from it is the key input for the Time Slot view of the acceleration data.
The ShockLog™ recorder records acceleration and other environmental data in three ways simultaneously – Summaries , Events and Time Slots . A fixed amount of memory is allocated to each recording method. "
- Condition: Used
- Type: Environemental Monitoring G-force recorder
- Make: Lamerholm
- Series: ShockLog
- Model: RD298
- Part: 29800STF0
- Accessories: nil
- Weight: 0.8kg
Replacement price on this kit is approximately AUD$
The unit is sold with a Works on Arrival Warranty.