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The Tektronix 1L5 is a low-frequency spectrum analyzer for 500-series | The Tektronix 1L5 is a low-frequency spectrum analyzer for [[500-series scopes]]. | ||
Its center frequency is set on a trio of rotary switches and can range from 50Hz to | |||
990kHz. Minimum resolution bandwidth is 10Hz. It has a 1 meg input resistance. | |||
Type 1L5 was sold from 1967 or 1968 until the end of the classic plugin scope | |||
line after 1974. Not particularly well calibrated in either frequency, bandwidth, | |||
or amplitude, it was no match for HP's 141T/8556A/8552B combination as performance | |||
was concerned, but it was a small fraction of the price. | |||
Although Type 1L5 can operate in any classic plugin scope*, it is by far the | |||
most useful in the Type [[549]] storage mainframe, where it's possible to | |||
sweep slowly and take advantage of the narrower resolution bandwidths. | |||
<nowiki>*</nowiki> 531/535/541/545 need a wiring mod to alleviate a | |||
vertical amp instability. |
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