Guralp Systems CMG-40T - Manual (Page 30)

CMG-40T
Sensor response codes
Sensor Sensor type code Units (V/A)
CMG-5T or 5TD, DC – 100 Hz response
CMG-5_100HZ A
CMG-40T-1 or 6T-1, 1 s – 100 Hz response
CMG-40_1HZ_50HZ V
CMG-40_1S_100HZ V
CMG-40T-1 or 6T-1, 2 s – 100 Hz response
CMG-40_2S_100HZ V
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 handheld control unit
If you prefer, you can inject your own calibration signals into the system
through a handheld 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
40T.
The calibration resistor is placed in series with the transducer. Depending on the
calibration signal source, and the sensitivity of your recording equipment, you
30 Issue A