Internal Sensors |
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| 2 internal accelerometers | Semiconductor dual axis accelerometer with a maximum range of +/-2g and a resolution of 1/256th of a g. Output transferred to processor in digital format guaranteeing exceptionally accurate noise free measurements. Software correction for vehicle roll and pitch.. |
External Inputs |
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| 2 external analogue voltage channels | Both channels are 8 bit resolution (256 level) with a software selectable maximum input of either 5v or 12v, giving a corresponding resolution of 20mV or 47mV respectively. Digital filter ensures excellent low noise response. Input impedance 10k Ohms. |
| digital channel | Schmitt trigger input with software set thresholds. Upper and lower thresholds can be set between 0 to 12v with a resolution slightly less than 8 bit. Input impedance 10k ohm. |
| engine speed input | Custom designed input circuit designed to pickup pulses from the HT (recommended) or low voltage side of the ignition system. Maximum input frequency of 200Hz, which on a 4 cylinder engine gives a maximum possible RPM of 24000rpm, on an 8 cylinder engine 12000rpm. |
| wheel speed input | Optional wheel speed input using reed switch and magnet attached to the wheel. Maximum input rate of 200Hz. For a wheel with a rolling circumference of 2m, this gives a maximum speed of 1440km/h. |
| Trigger for external triggering | Optional external push switch to start logging. This is normally used to start and stop logging from a steering wheel mounted button. |
Data Transfer to PC |
| Transfer from the DL90 to the PC using RS232 at 115200 baud, either in a continuous stream (fast mode) or in 8 byte error checked packets (slower mode which is sometimes required for laptops and slower desktops). In fast mode a 20 minute race takes 55 seconds to download. |
Power Supply |
| 7v-18v power connection, either supplied from the car battery, or via a mains adapter (supplied). Maximum current required approximately 200mA including GPS reciever. |
Sample Rate |
| Fixed 100 times a second for all channels. |
Internal Memory |
| 32 Mbit internal flash memory, enough for a total of 87 minutes of storage. Up to 256 individual runs can be stored at any one time. Flash memory retains it contents for years, even without power. |
Connectors |
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| GPS serial | 9 way male d-type |
| PC serial | 9 way male d-type |
| Power | 2.5 mm short |
| Aux inputs | AMP screw type connector block type |
Physical Specification |
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| Mounting | Either using the supplied aluminum brackets or alternatively blu tac or Velcro for temporary installations work well. |
| Indicators | 3 high brightness LEDS to indicate power, sampling/RPM present, and GPS present/locked |
| Buttons | Power on/off, sample stop/start, GPS bypass mode and memory erase modes available by holding down power button. |
| Weight and Dimensions | 175g, outside maximum dimensions with no connectors plugged in 110mm x 75mm x 30mm. |
| Construction | Black anodized aluminum extrusion, end caps made from 5 layer carbon fibre sheet, CNC cut and screen printed. |