The Tektronix SD26 is a dual-channel, 20 GHz equivalent bandwidth sampling head designed for high-performance signal acquisition in Tektronix 11800 Series and CSA803 Series mainframes. It offers the same acquisition performance as the SD24 but without the TDR step generators, making it ideal for high-speed electrical sampling and measurement applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Proprietary internal mainframe interface connector |
| Display | None (utilizes mainframe display) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered directly from mainframe |
| Operating Temperature | 0 °C to +50 °C |
| Dimensions (W×H×D) | 25.4 mm × 73.6 mm × 91.4 mm |
| Weight | 0.155 kg |
Vertical System
| Parameter | Value |
|---|---|
| Number of Channels | 2 |
| Equivalent Bandwidth | 20 GHz (typical) |
| Rise Time | 17.5 ps |
| Maximum Sample Repetition Rate | 200 kHz |
| Displayed Noise (Unity Dot Response, Maximum) | 1.2 mV |
| Displayed Noise (Unity Dot Response, Typical) | 750 µV |
| Displayed Noise (With Smoothing, Maximum) | 550 µV |
| Displayed Noise (With Smoothing, Typical) | 350 µV |
| Dot Transient Response Accuracy | ±5% for signals up to 0.5 Vp-p (after calibration at operating temperature) |
| Dot Transient Response Range | Adjustable to unity for signals up to 1.0 Vp-p |
| Aberrations (10 ns to 20 ps before step) | ±3% or less (typical) |
| Aberrations (<300 ps after step) | +10%, -5% or less (typical) |
| Aberrations (300 ps to 5 ns after step) | ±3% or less (typical) |
| Aberrations (5 ns to 100 ns) | ±1% or less (typical) |
| Aberrations (elsewhere) | ±0.5% or less (typical) |
Input Characteristics
| Parameter | Value |
|---|---|
| Input Impedance | 50 Ohm ±0.5 Ohm |
| Maximum Safe Input Voltage | ±3 V |
| Input Connector Type | 3.5 mm Female (SMA compatible) |
Mainframe Compatibility
| Parameter | Value |
|---|---|
| Supported Mainframes | Tektronix 11801, 11802, CSA803 series |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 °C to +75 °C |
| Operating Altitude | 4,570 m (15,000 ft) |
| Non-Operating Altitude | 15,240 m (50,000 ft) |
Performance
| Parameter | Value |
|---|---|
| Channel-to-Channel Isolation | ≥ 34 dB at 20 GHz |
| Nominal Delay | 1.9 ns |
| Loop-Through Reflection Coefficient (within 150 ps of step) | ≤5% |
| Loop-Through Reflection Coefficient (elsewhere) | ≤2% |
| Loop-Through Insertion Loss (DC to 10 GHz) | ≤1.0 dB |
| Loop-Through Insertion Loss (10 GHz to 20 GHz) | ≤2.0 dB |
| Offset Range | ±1.0 V |
Technology
Equivalent-Time Electrical Sampling
Applications
High-Speed Electrical Signal Analysis