The Counter Timer/Trigger Option 06 and Counter Timer/Trigger with Word Recognizer Option 09 add the following four capabilities to the Tektronix 2445 and 2465 Oscilloscope 1. Precision time-interval measurement. 2. Event and frequency counting. 3. Deiay-by-events triggering. 4. Logic triggering. The 17-bit Word Recognizer Probe of Option 09 extends the capabilities of these functions. The functions described in this manual which use the Word Recognizer require the Word Recognizer Option 09 and the 17-bit Word Recognizer Probe The Counter Timer/Trigger and Counter Timer/Trigger with Word Recognizer options use the 2445 and 2465 alphanumeric crt readout to display configuration menus and function results. The Oscilloscope operators manual should be consulted for operating information regarding the 2445 and 2465 instruments. The operation and specifications of functions not described in this manual remain unchanged. in addition to the standard instrument’s standard Accessories the following standard Accessories are provided with each instrument containing the 2445 2465 Option 06 Counter Timer/Trigger: 1 2445 2465 Option 06 and Option 09 Counter Timer/Trigger and Word Recognizer Operators Manual. 1 2445 2465 Option 06 and Option 09 Counter Timer/Trigger and Word Recognizer Reference Card 1 2445 2465 Option 06 and Option 09 Counter Timer/Trigger and Word Recognizer Reference Guide Each instrument containing the Word Recognizer is provided with the following standard Accessories in addition to those mentioned for the Counter Timer/Trigger: 1 P6407 Word Recognizer Probe package. The following optional accessory is also available for these options: 1 2445 2465 Option 06 and Option 09 Counter Timer/Trigger and Word Recognizer Service Manual