Physical specifications
Instrument
| Parameter | Value |
|---|---|
Maximum number of readings1 |
240 million |
External power |
4.5V to 30V |
Communications |
RS-232 |
Clock drift2 |
±60 seconds per year |
Depth rating |
1250m |
Housing material |
Plastic |
Dimensions |
195.8mm × 63.8mm × 78.6mm |
Top curvature, selectable |
Ø220mm or Ø124mm |
Weight (in air) |
0.8kg |
Weight (in water) |
0.17kg |
Displacement |
600cm3 |
1 Each sample can include multiple readings.
2 The realtime clock is not maintained when there is no power.
Power consumption
| Parameter | Value |
|---|---|
≤1Hz sampling |
22.8mJ per sample |
≥2Hz sampling |
46mW |
Sleep power |
180μW |
Typical peak inrush current |
6.6A (15µs duration) |
Startup time
Generally, there is no need to power off RBR instruments. The RBRlegato⁴ will go to sleep after inactivity, consume virtually no power while on standby, and then wake up instantly when required.
If you turn off the instrument, there will be a delay starting up. Furthermore, you will have to wait for at least two minutes before turning it back on.
-
Elapsed startup time from fully discharged state to functional command interpreter: 4s maximum
-
Elapsed power downtime to complete discharge: 120s minimum
|
Ensure that the instrument is fully discharged before resuming the measurements. Power-cycling the unit for less than 120s may leave the board in an unknown state. In addition, the realtime clock may not be maintained over a power cycle. |
External port
The RBRlegato⁴ uses an external MCBH-6-MP connector. It can be used for connecting to an RS-232 underwater extension cable.
External MCBH-6-MP connector pinout
|
Pin No. |
RS-232 |
1 |
Ground |
|
2 |
Power 4.5V to 30V |
|
3 |
Data output from the instrument (Tx) |
|
4 |
Data input into the instrument (Rx) |
|
5 |
N/C |
|
6 |
N/C |
