{"id":263,"date":"2025-09-30T17:45:36","date_gmt":"2025-09-30T23:45:36","guid":{"rendered":"https:\/\/thesinewave.com\/home\/?page_id=263"},"modified":"2025-10-02T17:20:18","modified_gmt":"2025-10-02T23:20:18","slug":"how-the-t-800-works","status":"publish","type":"page","link":"https:\/\/thesinewave.com\/home\/how-the-t-800-works\/","title":{"rendered":"How the T-800 works"},"content":{"rendered":"\n

The pulser voltage from the T-800 has user selectable outputs of 200V, 400v, 600v, and 800v. It also has a definable pulse width of 65ns to 1275ns to accommodate a wide range of transducer frequencies. Additionally, as you\u2019ll see in scheme 3 below, the pulse repetition rate can be defined from 100Hz to 4KHz when using the internal pulser. For firing schemes 1 and 2 the repetition rate is simply set by the instrument.<\/p>\n\n\n\n

The T-800 works in a pitch\/catch scenario, this can either be in Dual or through transmission.<\/p>\n\n\n\n

Scheme 1:<\/h1>\n\n\n\n

Scheme 1 intercepts the pulse transmission coming from the instrument and going to the probe. The pulser voltage into the T-800 should be no greater than 400v and no less than 50v. It is recommended to just set the instrument pulser voltage to 100v and let the T-800 do the rest.  <\/p>\n\n\n\n

For conventional UT equipment a user would simply connect the transmit jack to the high voltage in on the T-800 and then run another cable to the transmitting probe. The receiving probe is connected normally to the receiver jack. The instrument is set up in a normal fashion; however, the pulse width will be set by the user on the T-800.<\/p>\n\n\n\n

When running a phased array application, we simply wire the connector accordingly, and all else is normal programing for the exam. Again, the pulse width will be set by the user on the T-800.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Scheme 2:<\/h1>\n\n\n\n

Scheme 2 uses the TTL output (encoder) to trigger the T-800 for running a pulse on position (POP) type exam. This is usually a low voltage signal less than 15v. This requires the correct wiring for the instrument you have, which can be found in the owner\u2019s manual.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Scheme 3:<\/h1>\n\n\n\n

Scheme 3 uses the internal pulser inside the T-800 without connecting to a trigger such as scheme 1 and 2. This is accomplished in the following manner.<\/p>\n\n\n\n

The Pulse Repetition Rate (PRR) is on\/off selectable and activated by the user on the T-800. When the PRR is activated, this initiates the internal pulser to fire and also generates a timing signal to sync with the receiver. The instrument uses this timing sequence to correctly generate the signals\/image on the screen.<\/p>\n\n\n\n

It should be noted that some manufacturers\u2019 portable instruments do not have this capability.<\/p>\n\n\n\n

When used in this fashion, the T-800 generates the pulse to the transmitting probe, and the receiving probe returns to the instrument normally. An additional cable is ran from the \u201cTTL Sync Out\u201d to the TTL input on the instrument.<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

The pulser voltage from the T-800 has user selectable outputs of 200V, 400v, 600v, and 800v. It also has a definable pulse width of 65ns to 1275ns to accommodate a wide range of transducer frequencies. Additionally, as you\u2019ll see in scheme 3 below, the pulse repetition rate can be defined from 100Hz to 4KHz when … <\/p>\n

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