Tektronix S-4 Sampling Head

Tektronix Catalog Cost	Low Bid	High Bid	average
$795 (1969-new) $875 (1973) $1290 (1977) $2505 (1982) $2945 (1985) $2500 (1989)	.	.	.
$78.60 3/31/03 #2518954751 lcoppes (untested) (4 bids $50 start) $89.00 3/30/06 #7603489628 nouturnhere (10 bids $5 start) (untested but guaranteed) $79.95 (+~$19 ship) 7/13/07 #290136734384 astglobal-dot-com (1 bid) (tested,functional,returnable)

	Bandwidth : 14 GHz
	Risetime 25 ps
	50 ohms Input Impedance
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The S-4 Sampling Head is a 25 ps risetime unit with a 50 Ohm input impedance, and an equivalent badwidth from DC to 14 GHz. The S-4 can be plugged into the 7S11 or 7S12 Sampling units, or attached by a sampling head extender for remote use. A trigger pickoff within the S-4 provides a trigger signal output from the plug-in unit.

The S4 Sampling Head has a 25 ps risetime, DC to 14GHz, 50 ohm input impedance. Variable DC Offset allows signals between +1 V and -1 V limits to be displayed at 2 mV/div. Displayed noise is >/= 5 mV unsmoothed, 2.5 mV smoothed (includes 90% dots).