The Tektronix S-3 sampling head is a plug-in head for use with the 7000 series sampling plug-ins or the Type 3S2, 3S5, and 3S6 samplers.
The plug-in includes a permanently attached 1× probe with the sampling bridge enclosed in the probe. Optional 10× or 100× attenuator tips (010-0364-00, 010-0365-00) provide extended input voltage range; the optional VP-2 voltage pickoff converts it to a 50 Ω feed-through sampling head.
|Rise time||≤350 ps (×10, ≤400 ps; ×100, ≤500 ps)|
|Input impedance||100 kΩ // 2.3 pF (×10, 1 MΩ // 2 pF; ×100, 1 MΩ // 1.7 pF)|
|Maximum signal||2 Vp-p (×10, 20 Vp-p; ×100, 200 Vp-p)|
|Maximum safe input||max. ±100 V, max. sine input 20 Vp-p (×10 or ×100, max. ±350 V, max. sine input 200 Vp-p)|
Differences between S-3 and S-3A
The S-3A sampling head has a 10× improvement in baseline shift due to cable flexing. All other specifications are identical to the ordinary S-3.
The major differences in design involves the gate board in the box part of the probe, but some changes are also made to the circuits in the body of the probe.
Difference between the S-3 and the P6038
The S-3 probe contains a compensated attenuator before the sampling bridge. The P6038 does not. The S-3 probe has a JFET buffer between the holding cap and the probe cable. The P6038 does not. Both use the 152-0368-00 sampling bridge. The sampling pulse is generated by a snap-off diode (152-0368-00).
Repair of Sampling Diodes
Individuals have reported success in replacing the S-3 sampling diodes with Agilent matched pair Schottky diodes.