VEMCO – VR100 Receiver Operating Manual – Page 16
2.2.11 Clear VR100 Memory
When 100 % of the log memory is full, the memory must be erased before more events can be logged. The
memory is erased from either the Event Log screen (described below) or from within the PC software, but
the
memory should only be erased after the log has been copied to a computer
(see the software manual
for details).
To erase memory using the VR100, from the Main menu on the VR100:
1.
Select Config (right selection button).
2.
Press “5” on the keypad.
3.
Press the right selection button to erase the data. It’s strongly recommended that data be loaded to a
computer using the VR100HS software
before
the memory is erased.
4.
Confirm the erasure of the data by pressing the button identified in the confirmation window.
Erasing the event log will only erase the events that have occurred to the VR100 receiver and not the
channel settings or the sensor tag information.
2.2.12 Using Signal Strength and Gain when tracking
When tracking a tag using the VR100 and a directional hydrophone (the VH110 for example), the signal
strength will increase as the hydrophone approaches the tag. The gain must be set to manual (“M” appears
in the Monitor screen – see section 4.2) during this procedure.
When the signal strength bar graph is near full scale, the manual gain should be reduced so meter
variations will indicate transmitter direction as the hydrophone is turned. If the signal level indicator is at
the bottom of the scale, the gain should be increased to detect meter variations.
IMPORTANT: The signal strength reading is a relative measure of the voltage level present at the
receiver input (0dB = minimum measureable voltage, 105dB = full scale voltage). It is strictly a
relative measure of signal strength and
cannot
be used to measure the output power of a transmitter
in terms of dB re 1uPa @ 1m.
