Guralp-systems CMG-5T Manuel d'utilisateur Page 1

CMG-5TTriaxial AccelerometerOperator's guidePart No. MAN-050-0001Designed and manufactured byGüralp Systems Limited3 Midas House, Calleva ParkAld

CMG-5Tdifferential outputs with low gain and another pair with high (around × 10) gain.Optionally, the second gain block can be configured at the fact

Operator's GuideThe primary gain block of the 5T is normally set at × 1 (unity). If higher sensitivity is required, the gain of the instrument ca

CMG-5T3 CalibrationThe 5T is supplied with a comprehensive calibration document, and it should not normally be necessary to calibrate it yourself. How

Operator's GuideIn this diagram a Güralp digitizer is being used to inject a calibration signal into the sensor. This can be either a sine wave,

CMG-5T2. Select the calibration channel corresponding to the instrument, make any other choices you require, and click Inj

Operator's GuideThe Ampl Cursors button will now be displaying a value, which is the strength of the returning sign

CMG-5Tdigitizer should be double this: 693,944 counts. All Güralp Systems sensors use balanced differential outputs.The actual signal at the digitiz

Operator's Guide4 Inside the 5TThe 5T unit is constructed of hard-anodised aluminium with “O” rings throughout, ensuring a completely waterproof

CMG-5TThe mass and the capacitor plates are energised by a two-phase transformer driver, forming a differential capacito

Operator's GuideThe sensor transfer functionMost users of seismometers find it convenient to consider the sensor as a “black box”, which produces

CMG-5TTable of Contents1 Introduction...32

CMG-5TIn this equation zn are the roots of the numerator polynomial, giving the zeros of the transfer function, and pm are the roots of the denominato

Operator's Guide5 Calibration informationEvery CMG-5T is supplied with a comprehensive calibration pack detailing the characteris

CMG-5T6 Connector pinouts6.1 5Ts with high gain output optionThe 5T sensor has a single connector for both power and signal output. The following deta

Operator's Guide6.2 5T high pass filter output optionThe following table applies if the second amplification stage is being used to provide

CMG-5T7 SpecificationsOutputs and responseLow gain output options 2g, 1g, 0.5g, 0.1g Corresponding high gain outputs0.2g, 0.1g, 0.05g, 0.01g Dynamic

Operator's Guide8 Revision history1009-12-14 E Revised calibration section and new “internals”diagram.2009-10-05 D Additional connector

Operator's Guide1 IntroductionThe CMG-5T accelerometer is a three-axis strong-motion force-feedback accelerometer in a sealed case.

CMG-5Tfrequency pass band is flat to acceleration from DC to 100 Hz (although other low pass corners from 50 Hz

Operator's Guide2 Installation2.1 Unpacking and packingThe CMG-5T accelerometer is delivered in a single cardboard box with foam rubber lining. T

CMG-5T• The central hole for the main fixing bolt; and• The serial number. If you need to request the sensor production history, you will need to quot

Operator's GuideIf the performance so far has been as expected, the instrument may be assumed to be in working order and you may proceed to insta

CMG-5T1. Prepare a quick-setting cement/sand mixture, and pour it into the hole.2. “Puddle” the cement by vibrating it until it is fully liquefied, al

Operator's Guide1. Remove the screwed cover protecting the level adjusters. The cavity contains three adjustment screws, which are arranged as sh