SD-24: Difference between revisions

Latest revision as of 04:14, 8 June 2024

Tektronix SD-24
20 GHz Sampling/TDR Head Tektronix SD-24 Sampling/TDR Head Compatible with 11800-series scopes Produced from 1989 to (?) Manuals Tektronix SD-24 User Manual Tektronix SD-24 Service Manual (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix SD-24 is a dual channel TDR/sampling head with 17.5 ps rise time (equiv. 20 GHz bandwidth) for the 11800 series scopes.

Each channel is also capable of generating a fast rising step for use in Time Domain Reflectometry (TDR). In TDR mode, the acquisition portion of the sampling head monitors the incident step and any reflected energy. The reflected rise time of the TDR step is 35 ps or less. The polarity of each channel's TDR step can be selected independently of the other channel. This allows for differential or common-mode testing of two coupled lines, in addition to the independent testing of isolated lines. The SD-24 can be used to characterize crosstalk by using the TDR step to drive one line while monitoring a second with the other channel.

The "filter" function on the CSA803C/11801C can be used with TDR or crosstalk measurements to characterize a system at a slower rise time.

Picosecond Pulse Labs Application Note AN-2a says:

TEK 11802/SD-24: TEK introduced this new scope in the fall of 1989. It is a completely new design and is not interchangeable with any of the previous "S" series TEK sampling scopes. The TEK design team included: Stan Kaveckis, Agoston Agoston, John Carlson, John Rettig, Jon Lueker and Roy Lewallen. The 11802 is a completely digital mainframe. It can support two SD-24 dual-channel samplers. It is IEEE-488 programmable. The time base accuracy was excellent. The trigger jitter was 2.5 ps RMS.

The SD-24 sampler uses a six-diode sampling bridge similar in concept to the "trapped charge", traveling wave S-4 sampler. The SD-24 is a dual-channel sampler which includes a built-in TDR pulser. The SD-24 sampler is internally terminated in 50 Ohms. The risetime is 17.5 ps as specified. The picosecond domain transient performance was found to track well with waveforms measured on the HYPRES scope. It did show a few extra small (4%) perturbations in the 200 ps to 500 ps region that were not seen on the HYPRES or HP-54121A samplers. After 1 ns, the settling time transient performance was excellent. It was far better than any of the other samplers tested.

Key Specifications

Rise time	17.5 ps
Bandwidth	20 GHz
Sampling repetition rate	100 Hz to 200 kHz
Time coincidence	10 ps between channels
Maximum input voltage	1 V_p-p, 1.6 V_p-p operating, ±3 V non-destructive
Pulser rise time	28 ps
Pulser voltage	250 mV
Input	3.5 mm connectors

Links

Application Notes Referencing SD-24

Document	Title	Authors	Year	Links
85W-8882.pdf	Z-Profile Algorithm		1993	SD-24 • 11801 • 11802 • CSA803

Patents that may apply to SD-24

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 4755742A	Dual channel time domain reflectometer	Agoston Agoston • John Rettig • Stan Kaveckis • John E. Carlson • Andrew E. Finkbeiner	1986-04-30	1988-07-05	Time domain reflectometers • SD-24

Pictures

Thanks to John Larkin, Highland Technology, for the internal photos of the SD-24.

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar 2 |
+{{Plugin Sidebar
-title=Tektronix SD-24 |
+|manufacturer=Tektronix
-summary = 20 GHz Sampling/TDR Head |
+|series=11800-series scopes
-series=[[11800-series scopes]] |
+|type=SD-24
-image= sd24-front.jpg |
+|summary=20 GHz Sampling/TDR Head
-caption=Tektronix SD-24 Sampling/TDR Head |
+|image=SD-24 8.jpg
-introduced = 1989 |
+|caption=Tektronix SD-24 Sampling/TDR Head
-discontinued = (?) |
+|introduced=1989
-manuals=[http://w140.com/tektronix_sd24_tdr_sampling_head_service_manual.pdf Tektronix SD-24 Service Manual (PDF)]
+|discontinued=(?)
-[http://w140.com/tektronix_sd24_tdr_sampling_head_user_manual.pdf Tektronix SD-24 User Manual (PDF)]
+|designers=Agoston Agoston
+|manuals=
+* [[Media:070-7052-02.pdf|Tektronix SD-24 User Manual]]
+* [[Media:070-7053-01.pdf|Tektronix SD-24 Service Manual]]
 }}
+The '''Tektronix SD-24''' is a dual channel TDR/sampling head with 17.5 ps rise time (equiv. 20 GHz bandwidth) for the 11800 series scopes.
-The '''Tektronix SD-24''' is a dual channel TDR/Sampling Head with 17.5 ps rise time (equiv. 20 GHz bandwidth) for the 11800 series scopes.
 Each channel is also capable of generating a fast rising step for use in Time Domain Reflectometry (TDR). In TDR mode, the acquisition portion of the sampling head monitors the incident step and any reflected energy. The reflected rise time of the TDR step is 35 ps or less. The polarity of each channel's TDR step can be selected independently of the other channel. This allows for differential or common-mode testing of two coupled lines, in addition to the independent testing of isolated lines. The SD-24 can be used to characterize crosstalk by using the TDR step to drive one line while monitoring a second with the other channel.
@@ Line 19: / Line 21: @@
 Picosecond Pulse Labs Application Note AN-2a says:
 <blockquote>
-TEK [[11802]]/SD-24: TEK introduced this new scope in the
+TEK [[11802]]/SD-24: TEK introduced this new scope in the fall of 1989.
-fall of 1989. It is a completely new design and is not
+It is a completely new design and is not interchangeable with any of the previous "S" series TEK sampling scopes.
-interchangeable with any of the previous "S" series TEK
+The TEK design team included: [[Stan Kaveckis]], [[Agoston Agoston]], [[John Carlson]], [[John Rettig]], [[Jon Lueker]] and [[Roy Lewallen]].
-sampling scopes. The TEK design team included: Stan
+The [[11802]] is a completely digital mainframe. It can support two SD-24 dual-channel samplers. It is IEEE-488 programmable.
-Kaveckis, [[Agoston Agoston]], John Carlson, John Rettig,
+The time base accuracy was excellent. The trigger jitter was 2.5 ps RMS.
-Jon Lucker and Roy Lewallen. The 11802 is a completely
-digital mainframe. It can support two SD-24 dual-channel
-samplers. It is IEEE- 488 programmable. The time base
-accuracy was excellent. The trigger jitter was 2.5 ps rms.
 </blockquote>
 <blockquote>
-The SD-24 sampler uses a six-diode sampling bridge similar
+The SD-24 sampler uses a six-diode sampling bridge similar in concept to the "trapped charge", traveling wave [[S-4]] sampler.
-in concept to the "trapped charge", traveling wave [[S-4]]
+The SD-24 is a dual-channel sampler which includes a built-in TDR pulser. The SD-24 sampler is internally terminated in 50 Ohms.
-sampler. The SD-24 is a dual-channel sampler which
+The risetime is 17.5 ps as specified. The picosecond domain transient performance was found to track well with waveforms measured on the HYPRES scope.
-includes a built-in TDR pulser. The SD-24 sampler is
+It did show a few extra small (4%) perturbations in the 200 ps to 500 ps region that were not seen on the HYPRES or HP-54121A samplers.
-internally terminated in 50 Ohms. The risetime is 17.5 ps as
+After 1 ns, the settling time transient performance was excellent. It was far better than any of the other samplers tested.
-specified. The picosecond domain transient performance
-was found to track well with waveforms measured on the
-HYPRES scope. It did show a few extra small (4%)
-perturbations in the 200 ps to 500 ps region that were not
-seen on the HYPRES or HP-54121A samplers. After 1 ns,
-the settling time transient performance was excellent. It was
-far better than any of the other samplers tested.
 </blockquote>
@@ Line 52: / Line 43: @@
 {{Spec | Pulser rise time | 28 ps }}
 {{Spec | Pulser voltage | 250 mV }}
-{{Spec | Input | [[3.5 mm connector]] }}
+{{Spec | Input | [[3.5 mm connector]]s }}
 {{EndSpecs}}
+==Links==
+{{Documents|Link=SD-24|Class=Application Note}}
+{{PatentLinks|SD-24}}
 ==Pictures==
 <gallery>
+SD-24 8.jpg
+sd24-front.jpg
 Tek sd-24.jpg
 SD24 1.jpg