Hello,

I am currently working with a Lloyd Instruments TA1 texture analyzer using NEXYGEN Plus software to perform a two-cycle Texture Profile Analysis (TPA) on soft cheese samples.

My main issue is that the probe only completes the first compression cycle and then does not return to zero or initiate the second cycle. I have tried:

• Switching control between Extension and Load,
• Adjusting preload (1–5 N),
• Changing test speeds (60–100 mm/min),
• Enabling “Return to zero” and adding delay between cycles,
• Running dry tests without a sample (which work fine).

Despite these attempts, with the actual food samples the probe does not perform the second compression cycle.

Sample details: Rectangular block cheese, 450 mm height, ~95 mm width, 120 mm thickness. Probe: thin glass probe.

My question: Has anyone worked with TA1 (NEXYGEN Plus) for Cycling Test / TPA?

• What settings for Test Limits and Cycling Limits did you find effective?
• Do you recommend controlling by extension or by load for soft cheese samples?
• Any advice to ensure the probe returns and the second cycle starts correctly?

Any shared experience, screenshots, or example profiles would be highly appreciated.

Thank you!