TEK SD14 Sampling Head

Features

The SD-14 is a dual-channel, 3 GHz probe sampler designed for high-impedance signal acquisition where a 50 Ohm acquisition system is not the optimal solution. The SD-14 is ideal for high-speed device characterization such as ECL, CMOS, ACL and GaAs testing. The 100 kilohm input impedance and 0.5 pF capacitance results in very low loading of the device under test. The 7 V dynamic range and ±3.5 V offset range, makes the SD-14 suitable for testing all digital logic families as well as most analog circuits.

The SD-14 consists of two samplers, each attached at the end of a 1.0 meter cable for easy circuit probing. The modular architecture of the CSA 803C/11801C enables the use of extended samplers, bringing a new level of performance to sampling scopes. In conjunction with the 11801C and SM-11 multi-channel unit, it is possible to configure up to 136 channels of high-impedance, high-bandwidth acquisition with measurement accuracy approaching 140 ps.

SD-14 Option 01 adds a longer probe tip, two probe-to-ECB (etched circuit board) adapters, and two probe-to-SMB adapters. These ease probing of plated holes (as found in Outboards for IC testers) and semi-permanent connections.

• 100 kilohm, 0.5 pF Typical
• 7 V p-p Dynamic Range
• 3 GHz Bandwidth
• ECL, CMOS, ACL GaAs Device Characterization

Specifications

Acquisition System - SD-14, SD-22, SD-24, SD-26: dual channel; SD-20, SD-32: single channel.

Rise Time - SD-14: 140 ps; SD-20, SD-24, SD-26: 17.5 ps; SD-22: 28 ps, all from 10% to 90%.

Bandwidth - 3 GHz (typical) for the SD-14; 20 GHz for the SD-20, SD-24, and SD-26; 12.5 GHz for the SD-22; 50 GHz for the SD-32.

Dynamic Range - 1 V p-p within a ±1.6 V range for the SD-20, SD-22, SD-24, SD-32; 7 V p-p within a ±3.5 V offset range for the SD-14.

Dot Transient Response - Accuracy after calibration at operating temperature is ±5% for signals up to 0.5 V p-p. Adjustable to unity for signals up to 1.0 V p-p.

Input Impedance - SD-22, SD-24, SD-26, SD-32: 50 Ohm ±0.5 Ohm. SD-14 is 100 kilohm and 0.5 pF (0.55 pF for Option 01). SD-20 is not terminated and not rated.

Displayed Noise -

Aberrations (typical) (SD-20, SD-22, SD-24, SD-26 only) - The following are acquisition aberrations. 10 ns to 20 ps before step: ±3% or less. <300 ps after step: +10%, -5% or less. 300 ps to 5 ns after step: ±3% or less. 300 ps to 5 ns after step: ±4 or less (SD-20 only). 5 ns to 100 ns after step: ±1% or less. Elsewhere: ±0.5% or less.

Aberrations (typical) (SD-14 only) - <1.5 ns after step: +12%, -25%, 1.5 ns to 4 ns after step: +1%, -3%, 4 ns to 30 ns after step: ±2%. Elsewhere: ±1%.

Maximum Input Voltage - ±3 V. SD-14: ±15 V; SD-32: ±2 V.

Isolation Between Channels - 1% p-p voltage transmission from the channel driven by the 067-1338-00, to the quiescent channel.

Time Coincidence Between Channels - 10 ps accuracy; <0.2 ps/°C stability.

Displayed Rise Time.

Incident - 28 ps typical, 10% to 90%, at +250 mV or -250 mV output, elsewhere ±1%.

Reflected - 35 ps or less, 10% to 90%, at +250 mV or -250 mV output.

TDR Step Amplitude - Adjustable to ±250 mV (polarity of either step may be inverted).

Time Coincidence Between TDR steps - Adjustable to less than 1 ps.

Source Resistance - 50 Ohm ±0.5 Ohm.

Aberrations (at ±250 mV amplitude) - The following are TDR aberrations. 10 ns to 20 ps before step: ±3% or less. <300 ps after step: +10%, -5% or less. 300 ps to 5 ns after step: ±3% or less. Elsewhere: ±1% or less.

(11801C, CSA 803C, SD-Series Heads)

Temperature - Operating: 0°C to +50°C; nonoperating: -40°C to +75°C.

Altitude, Vibration, Shock, Bench Handling - Operating and nonoperating: meets MIL-T-28800C, Type III, Class 5.

Electromagnetic Compatibility (not SD-14) - Meets the following requirements of MIL-STD-461C: CE-03 Pt 4 Curve 1, CS-01 Pt 7, CS-02 Pt 4, CS-06 Pt 5, RE-02 Pt 7, RS-01 Pt 4, RS-02 Pt 5, RS-03 Pt 7 (limited to 1 GHz). Meets FCC Part 15, subpart J, Class A. For Germany: Meets VDE 0871/6.78 Class B. (Not all for SD-14.)

Humidity - To 95% RH at up to 50°C.

Input Signal - Frequency range is 1 to 20 GHz. Stable synchronization on signals of at least 100 mV p-p, as measured separately into 50 Ohm, 5 V p-p max.

Input Characteristics - 50 Ohm SMA (3 mm) connector. Open termination paralleled by 1 pF.

Trigger Output - Approximately 200 mV into 50 Ohm. Jitter is 6 ps rms or less with signals from 5 to 20 GHz; 7 ps rms or less with signals from 1 to 5 GHz. Kickout at signal input is 180 mV peak; kickout occurs between successive samples.