Güralp CMG-3ESP, Руководство оператора

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CMG-3ESP Calibrating the 3ESP
Sensor Sensor type code
Units
(V/A)
CMG-40T-1 or 6T-1,
10 s – 100 Hz response
CMG-40_10S_100HZ V
CMG-40, 20 s – 50 Hz response
CMG-40_20S_50HZ V
CMG-40, 30 s – 50 Hz response
CMG-40_30S_50HZ V
CMG-3T or 3ESP, 30 s – 50 Hz response
CMG-3_30S_50HZ V
CMG-40, 60 s – 50 Hz response
CMG-40_60S_50HZ V
CMG-3T or 3ESP, 60 s – 50 Hz response
CMG-3_60S_50HZ V
CMG-3T or 3ESP, 100 s – 50 Hz response
CMG-3_100S_50HZ V
CMG-3T or 3ESP, 120 s – 50 Hz response
CMG-3_120S_50HZ V
CMG-3T, 360 s – 50 Hz response
CMG-3_360S_50HZ V
CMG-3TB or 3V / 3ESP borehole,
30 s – 50 Hz response
CMG-3B_30S_50HZ V
CMG-3TB or 3V / 3ESP borehole,
100 s – 50 Hz response
CMG-3B_100S_50HZ V
CMG-3TB or 3V / 3ESP borehole,
120 s – 50 Hz response
CMG-3B_120S_50HZ V
4.4 Calibration with a hand-held control unit
If you prefer, you can inject your own calibration signals into the system through a
hand-held control unit. The unit includes a switch which activates the calibration
relay in the seismometer, and 4 mm banana sockets for an external signal source.
As above, the equivalent input velocity for a sinusoidal calibration signal is given by
v
=
V /
2 π
f R K
where V is the peak-to-peak voltage of the calibration signal, f is the signal
frequency,
R
is the magnitude of the calibration resistor and
K
is the feedback coil
constant.
R
and
K
are both given on the calibration sheet supplied with the 3ESP.
The calibration resistor is placed in series with the transducer. Depending on the
calibration signal source, and the sensitivity of your recording equipment, you may
need to increase
R by adding further resistors to the circuit.
4.5 The coil constant
The feedback coil constant K is measured at the time of manufacture, and printed on
the calibration sheet. Using this value will give good results at the time of
installation. However, it may change over time.
MAN-ESP-0001 26 Issue G - February 2016