X-cable tension is most accurately measured using a BRECO meter. Should a BRECO meter not be available, the X-cable tension needs to be measured as described under X-Cable Tensioning in this manual.
The specification for x-cable tension is 145 +/- 5Hz (or 10.5+/-0.5 lbs with the force gauge). The x-beam must be 350mm / 13.8" from the center of the X-cable pulley when using the gauge.
Should the cable tension be out of the specified range it needs to be re-tensioned. Use the guidelines outlined in X-Cable Tensioning.