Atec Agilent-355C User Manual

HP 355C/D VHF Attenuators

dc to 1 GHz

Technical Specifications

Features and Applications

Description

Precision attenuation from dc to 1000 MHz is available with these Hewlett-Packard attenuators. Model 355C provides 0 to 12 dB in 1-dB steps and Model 355D provides 0 to 120 dB in 10-dB steps. Standard 355C’s and D’s are equipped with BNC connectors. Units can be coupled together with a standard UG-491A/U male-to-male BNC adapter . Option 001 Type N connector 355’s are ideally suited for applications such as receiver testing where minimum leakage is important. Option 001 355’s may be couple together with the HP 1250-0778 Type N maleto-male adapter (UG-57B/U). Using the 355C and 355D in series provides precision The

•Broad frequency coverage, dc to 1000 megahertz

•Low insertion loss

•Low SWR and negligible leakage

•Measure gain, attenuation, frequency response

•Broaden usefulness of present equipment

•Calibrate signal sources

attenuation in 1-dB steps from 0 to 132 dB. Also, these attenuators may be connected with either terminal as input or output.

Basic Design

A departure from the usual attenuator design has resulted in an accurate, compact, and rugged attenuator with low insertion loss and low SWR. Error is reduced to a minimum on all steps. Attenuator sections are inserted and removed by camactuated microswitches which keep lead lengths short. This novel system minimizes stray capacitances and inductances and extends the upper frequency limit of the HP 355 attenuators to 1000 MHz. In addition, the phase shift is kept at a minimum.

electrical length for the 355 C/D is approximately 60 cm at 0 dB (no sections engaged). For each section engaged, the electrical length decreases approximately 2 cm.

In addition, the design provides a rugged, compact unit in which the component parts are rigidly positioned and well shielded so that neither stray pickup nor signal leakage is a problem. The 355 attenuators are available for either bench or panel mounting (Option 003). To enable the attenuator to be panel mounted, the shaft has been extended

0.18 in. and the casting drilled

and tapped for (4) 6-32 screws. Remotely programmable units are also available under model numbers 355E and 355F.

Specifications

Model 355C

Attenuation: 12 dB in 1-dB steps. Frequency Range: DC to 1000 MHz. Overall Accuracy: ±0.1 dB at 1000 MHz; ± 0.25 dB dc, to 500 MHz;

± 0.35 dB, dc to 1000 MHz.

Model 355D

Attenuation: 120 dB in 10-dB steps. Frequency Range: DC to 1000 MHz. Overall Accuracy: ± 0.3 dB to 120 dB at 1000 Hz; ± 1.5 dB to 90 dB below

1000 MHz; ± 3 dB to 120 dB below 1000 MHz.

For Both Models

Impedance: 50 ohms nominal. Power Handling Capability: 0.5 watt average, 350 watts peak. Maximum SWR (input and output): 1.2 below 250 MHz; 1.3 below 500 MHz;

1.5 below 1000 MHz.

Maximum Insertion Loss (insertion loss at 0 dB): 0.20 dB + 2.30 dB/GHz. Dimensions (maximum envelope, bench or panel mount): 152 x 71 x 69 mm

(6 in. long, 2

/16 in. wide, 211/16. high).

Weight (bench or panel mount): net, 0.7 kg (1

/2 lb); shipping, 1.4 kg (3 lb).

Option 001: HP 355C, 355D Type-N Connectors Option 003: HP 355C, 355D Panel Mounting Capability Option 005: HP 355C, 355D TNC Connectors

For more information on HewlettPackard Test and Measurement products, applications, or services, please call your local HewlettPackard sales office. A current listing is available via the Worldwide Web through AccessHP at http://www.hp.com. If you do not have access to the internet please contact one of the HP centers listed below and they will direct you to your nearest HP representative.

United States:

Hewlett-Packard Company Test and Measurement Organization 5301 Stevens Creek Blvd. Bldg. 51L-SC Santa Clara, CA 95052-8059 1 800 452 4844

Canada:

Hewlett-Packard Canada Ltd. 5150 Spectrum Way Mississauga, Ontario L4W 5G1 (905) 206 4725

Europe:

Hewlett-Packard European Marketing Centre P.O. Box 999 1180 AZ Amstelveen The Netherlands

Japan:

Hewlett-Packard Japan Ltd. Measurement Assistance Center 9-1, Takakura-Cho, Hachioji-Shi, Tokyo 192, Japan Tel: (81-426) 56-7832 Fax: (81-426) 56-7840

Latin America:

Hewlett-Packard Latin American Region Headquarters 5200 Blue Lagoon Drive, 9th Floor Miami, Florida 33126, U.S.A. (305) 267 4245/4220

Australia/New Zealand:

Hewlett-Packard Australia Ltd. 31-41 Joseph Street Blackburn, Victoria 3130, Australia 1 800 629 485

Asia Pacific:

Hewlett-Packard Asia Pacific Ltd. 17-21/F Shell Tower, Times Square, 1 Matheson Street, Causeway Bay, Hong Kong Fax: (852) 2506 9285