Mts DCPD Measurement System Manual de usuario descargar pdf (Pagina 18)

DCPD Measurement System Introduction

The direct current potential drop (DCPD) crack measurement system is paired with an MTS closed-loop

servohydraulic controller. The closed-loop controller provides specimen loading, and data acquisition and

storage. A typical materials test applies a load or force on a specimen to grow the crack. In fatigue crack

growth tests, the load is a dynamic load simulating a material in a rotating or dynamic environment such

as an aircraft engine. In fracture toughness or creep tests the load is static or slowly varying, simulating a

material in other environments such as a pressure vessel.

Theoretically, the DC conditioners found in the MTS controller could supply the constant current and amplify

the electrical potential drop, but these conditioners do not have enough current or amplification for typical

DCPD specimens. Therefore, the DCPD Measurement System electronics provide the current and amplify

the resulting potential drop. Then the high level signal (amplified to a value between 0.1V and 10 V) is

brought into the controller or data logging device.

Component Identification (Rear View)

DescriptionLabelItem

Banana jacks to connect current leads.Current Out1

Local adjustment, Remote connector, and selector switch.Current Set2

The service port is used by MTS personnel for

troubleshooting. It provides a way to measure four things:

Service Port3

supply current, supply voltage, pulse command, and

direction command.

Selector switch to set the gain factor; either X1 or X10.Gain4

Selector switch to set the low pass filter; either 50 Hz or

300 Hz.

LPF5

Cable connector to controller E-Stop. For non-494

controllers, please contact MTS Technical Support.

E-Stop6

18 | DCPD Measurement System

Introduction

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Mts DCPD Measurement System Manual de usuario Pagina 18