HP 4944A Transmission Impairment Test Set

About This Item
Acquired from the US Government. Actual item from lot is shown, unit powers. Used pull, inspected thoroughly. Only what is shown is included.


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DESCRIPTION

Further Information
The 4944A Transmission Impairment Measuring Set (TIMS) measures analog parameters on voice bandwidth data circuits. This unit tests loss, message circuit noise, noise-with-tone, signal-to-noise ratio, impulse noise, envelope delay distortion, and nonlinear distortion tariffed for C- and D-conditioned leased data lines. The 4944A comes equipped with master-slave capabilities, allowing use on 4-wire circuits. This unit also comes with an automatic, comprehensive self-checking capability. The transmitter frequency range is from 200Hz to 3950Hz with a resolution of 1Hz. The transmitter level range is from +10 dBm to -40 dBm with a resolution of 0.1 dBm. The receiver frequency range covers 200Hz to 4100Hz with a resolution of 1Hz. The receiver level range is from +10 dBm to -69.9 dBm with a resolution of 0.1 dBm. The transmitter impedances are 600-ohms and 900-ohms nominal. The receiver terminating impedances are 600-ohms and 900-ohms. This unit comes with weighting filters C-message or 3kHz flat, and notch filter (>50 dB rejection from 995Hz to 1025Hz). The impulse noise threshold range is from 30 dBrn to 109 dBrn.

• The transmitter frequency range is from 200Hz to 3950Hz with a resolution of 1Hz.
• The transmitter level range is from +10 dBm to -40 dBm with a resolution of 0.1 dBm.
• The receiver frequency range covers 200Hz to 4100Hz with a resolution of 1Hz.
• The receiver level range is from +10 dBm to -69.9 dBm with a resolution of 0.1 dBm. The transmitter impedances are 600-ohms and 900-ohms nominal.
• The receiver terminating impedances are 600-ohms and 900-ohms.
• This unit comes with weighting filters C-message or 3kHz flat, and notch filter (>50 dB rejection from 995Hz to 1025Hz).
• The impulse noise threshold range is from 30 dBrn to 109 dBrn

Measures All Parameters for C & D Conditioned Channels

The 4944A TIMS measures all parameters including nonlinear distortion, tariffed for C- and D-conditioned leased data lines. Non-linear distortion is measured using the four tone intermodulation distortion technique. This technique is licensed under Hekimian Laboratories, Inc. Patent No. 3862380. The 4944A TIMS computes the 2nd and 3rd order products and automatically corrects the readings for noise.  Applications for the 4944A TIMS include circuit routining, circuit troubleshooting and installation testing. The portable 4944A is designed for both field service use and test center use.

OPTIONS
• Option 010 = Interface Bus (HPIB)