Instruction manual

SI-MT/SI-MKB/SI-HTB

WORLD PRECISION IN STRU MENTS

the motor so that the sarcomere length is held constant while trying to study true

isometric contractions

• Bypass–In this mode, the Constant Load Module is completely bypassed.

Bypass Motor Command

received from

LabTrax 8/16

Command sent

to Linear Motor

To use Bypass Mode, send a continuous voltage of at least 3.0V from one of the ana-

log or digital outputs of the LabTrax 8/16 to the CL Bypass inputs of the SI-COLUB.

In this mode, the motor is moved by connecting the analog position protocol output

of the LabTrax 8/16 to the Bypass MOT CMD of the module. The signal in the posi-

tion protocol programmed by MDAC will drive the motor when the MOT POS CMD

OUT is connected to the Position In of the SI-MOTDB Motor Controller.

IMPORTANT NOTE: THE SI-COLUB unit can only be used on tonically contracting muscle

tissue (for example, during a tetanic contraction). For equivalent experiments in cardiac

muscle and skeletal twitch contractions, the AFTERLOAD unit is needed. Contact WPI for

further information.

Force Step Dial

Restretch Potentiometer (Restretch)

External Command Toggle Switch (EXT CMD/CL)

Slack Potentiometer (Slack)

Stretch Control Knob

Capture BNC (CAPTURE)

Alternate Feedback BNC (ALT FB)

Bypass Motor Command BNC (BYPASS MOT CMD)

Motor Position Command Output BNC (MOT POS CMD OUT)

Constant Load Bypass BNC (CL BYPASS)

Constant Load Command BNC (CL CMD)

Fig. 19 The SI-COLU Constant Load Module can be used to switch from an isometric to an

isotonic contraction by engaging a feedback around a reduced constant measured force.