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The pulse-generating switch in the 109 is a mechanical [[mercury switch]], which limits pulse frequency to about 600 Hz. | The pulse-generating switch in the 109 is a mechanical [[mercury switch]], which limits pulse frequency to about 600 Hz. | ||
Moreover, this switch has a relatively short life time (200 hours) — if the operator forgets to shut the 109 down over the weekend and some holidays, the reed switch will need replacement. | Moreover, this switch has a relatively short life time (200 hours) — if the operator forgets to shut the 109 down over the weekend and some holidays, the reed switch will need replacement. [[Media:Component_news_259.pdf|Component News 259, 5 May 1978]] says: | ||
<blockquote> | |||
The most critical usage of mercury reed switches is in Tek's Type 109 Pulse Generator. | |||
(The 109 is used in-house for calibrating virtually all our product lines.) | |||
Unfortunately, there are no plans to replace this instrument line, which is dependent on the 260-0282-01 mercury reed switch | |||
for a 250 ps rise time pulse capability. | |||
To make matters worse, these switches are single-sourced from C. P. Clare, who must import them from Belgium. | |||
We are also having problems obtaining quality parts. | |||
(The raw switch costs approximately $5, but when the cost of rejects and added tooling are figured in , the cost per switch approaches $55.) | |||
</blockquote> | |||
The internal voltage source is adjustable from 0 to 50 V in three ranges (0.5 V, 5 V, 50 V), either positive or negative. | The internal voltage source is adjustable from 0 to 50 V in three ranges (0.5 V, 5 V, 50 V), either positive or negative. | ||