Chapter 2. Overview

The Güralp Certis is a compact, low-power, medium-motion seismometer suitable for surface and post-hole applications. No locking or centring is required and the instrument is capable of operation over a wide range of angles, up to 90° from the vertical. An innovative digital feedback system permits both analogue and digital* outputs. The output is flat to velocity at frequencies up to 100 Hertz with a long-period corner which can be adjusted* between 1 second and 120 seconds. State-of-health information, response parameters and calibration figures are all available digitally*. The compact, stainless-steel body provides environmental protection to IP68 and includes a convenient lifting-hook on the top, alongside the single connector, an engraved arrow to indicate the direction which should face North and a bubble-level.

The Certis stands 112 mm high and is 80 mm wide. The illustration below is actual size:

The industry-standard, analogue, 40 V peak-to-peak, differential output is suitable for use with a wide variety of digitisers. For best results, however, we recommend the Güralp Minimus series. Using a Minimus, Minimus+ or Minimus2 digitiser with the Certis unlocks the features marked with asterisks above.