First encounters
In the illustration above, the break-out box is on the left and the hand-held control
unit is on the right.
3.2.2
The hand-held control unit
This portable control unit provides easy access to the seismometer's control
commands, as well as displaying the output velocity and mass position (
i.e.
acceleration) on an analogue meter.
3.2.2.1
Signal meter
The upper section of the HCU contains a simple voltmeter for monitoring various
signals from the instrument.
•
To monitor the low-gain outputs, switch the dial to
V, N/S
or
E/W LOW VEL
according to the component you want to monitor.
•
To monitor the high-gain outputs (on a 40T with that option), switch the dial
to
V, N/S
or
E/W HIGH VEL.
8
Issue F - June 2019
