How to record mass-locking and unlocking operations

If you suspect problems with mass operations - unlocking, centring and locking - of Güralp 3-series instruments, Güralp support may request that you send GCF recordings illustrating the problem. These pages describe the sequences of actions required in order to make an effective, complete recording of these operations.

There are two versions of these instructions: choose the appropriate set below:

Minimus
Minimus+
Minimus₂
Minimus Lite

If you are using a Minimus, Minimus+, Minimus₂ or Minimus Lite digitiser as the recording device for your suspect instrument, click here to access the appropriate instructions.

CD24
DM24
3TD(E)
3ESPCD(E)

If:

you are testing a digital instrument containing a CD24 or DM24 digitiser, such as a 3TD, 3TDE, 3ESPCD or 3ESPCDE; or
you are using a CD24 or DM24 digitiser (including DM24SxEAMs) as the recording device for your suspect instrument;

then click here to access the appropriate instructions.

If you do not know which instructions to follow, please contact for advice.