The Keysight Technologies (formerly Agilent / HP) 4935A is an industry-standard Transmission Impairment Measuring Set (TIMS) designed for wideband data and voice line testing. It offers comprehensive testing capabilities, covering transmitter and receiver measurements from 20 Hz to 110 kHz.

Specifications

General

ParameterValue
DisplayDual 4-digit LED displays
Monitor SpeakerBuilt-in speaker with front-panel volume control for audio monitoring of the line

Physical

ParameterValue
Power Supply100 / 120 / 220 / 240 VAC (+10%, -13%), 48 to 66 Hz; optional internal rechargeable battery
Operating Temperature0 to 50 °C
Dimensions (W×H×D)284 mm × 133 mm × 343 mm
Weight5.4 kg

Transmitter

ParameterValue
Transmitter Frequency Range20 Hz to 110 kHz
Transmitter Frequency Resolution1 Hz (20 Hz to 9999 Hz), 10 Hz (10.00 kHz to 99.99 kHz), 100 Hz (100.0 kHz to 110.0 kHz)
Transmitter Frequency Steps1, 10, 100, 1000, or 10000 Hz
Transmitter Fixed Stored Frequencies404 Hz, 1004 Hz, 2713 Hz, 2804 Hz
Transmitter User-Programmable Frequencies4 temporary frequency registers
Transmitter Output Level Range-40 to +13 dBm
Transmitter Output Level Resolution0.1 dB
Transmitter Noise-with-Tone Frequency1004 Hz (fixed tone)
Transmitter 3-Level Impulse Noise Frequency1004 Hz (fixed tone) or quiet terminated (filter dependent)
Transmitter Optional P/AR FrequencyComplex pulse train of 16 frequencies between 140 Hz and 3890 Hz
Transmitter Optional P/AR Level Range-40 to 0 dBm
Transmitter Optional P/AR Level Resolution1 dB

Receiver

ParameterValue
Receiver Frequency Range20 Hz to 110 kHz
Receiver Level Range-60 to +13 dBm
Receiver Level Resolution0.1 dB
Receiver Noise-with-Tone Notch Filter Rejection>50 dB (995 Hz to 1025 Hz)
Receiver Noise-with-Tone Range10 to 100 dBrn
Receiver Signal-to-Noise Ratio Signal Level Range-40 to +13 dBm
Receiver Signal-to-Noise Ratio Range10 to 45 dB
Receiver 3-Level Impulse Noise Level Range-40 to +13 dBm
Receiver Optional P/AR Range0 to 120 P/AR units
Receiver Optional P/AR Level Range-40 to +3 dBm
Receiver Optional P/AR Resolution1 P/AR unit

Line Interface

ParameterValue
Line Termination Impedances135, 600, 900 ohms
Receiver Bridging Impedance>50 kohms
Loop Holding Current≥ 20 mA (typically 24 mA)
Line ConnectorsWECO 310 (3-pin) jacks for Transmit, Receive, and Dial

Transmitter Specifications

ParameterValue
Transmitter Frequency Accuracy±0.005%
Transmitter Level Accuracy (1004 Hz)±0.1 dB (at 0 dBm)
Transmitter Level Accuracy (300 Hz to 110 kHz)±0.2 dB (relative to 1004 Hz)
Transmitter Output Distortion and NoiseAt least 50 dB below fundamental at 1004 Hz (0 dBm)

Receiver Specifications

ParameterValue
Receiver Frequency Measurement Accuracy±0.005% of reading ± 1 Hz
Receiver Level Accuracy (1004 Hz)±0.1 dB (from 0 to -40 dBm)
Receiver Level Accuracy (300 Hz to 110 kHz)±0.2 dB (from 0 to -40 dBm)
Receiver Noise FiltersC-Message, 3 kHz Flat, 15 kHz Flat (or Program with Option 003 / 50 kbit with Option 004)

Impulse Noise Measurement

ParameterValue
Impulse Noise Dead Time125 ms
Impulse Noise Count RateMaximum 8 counts/second
Impulse Noise Timer1 to 99 minutes or continuous
Impulse Noise ThresholdsLow threshold selectable from 30 to 109 dBrn in 1 dB steps; Mid threshold is 4 dB above Low, High threshold is 8 dB above Low

Power Options

ParameterValue
Battery OperationUp to 5 hours of continuous operation (with Option 001 Battery Pack)

Inputs & Outputs

ParameterValue
DC BlockingUp to 200 Vdc on receiver and transmitter ports

Power

ParameterValue
Battery Operating TimeUp to 5 hours (Option 001)

Environmental

ParameterValue
Storage Temperature-40°C to +75°C (without batteries)
Operating HumidityUp to 95% RH at 40°C

Receiver Specs

ParameterValue
Impulse Noise Max Count9999 counts
Receiver Noise Measurement Range0 to 97 dBrn (C-message), 10 to 97 dBrn (3 kHz flat), 20 to 97 dBrn (15 kHz flat), 30 to 97 dBrn (50 kbit)
Receiver Noise Accuracy±1 dB (from 10 to 97 dBrn)

Technology

Analog Telecom Testing

Applications

Transmission Impairment Measurement (TIMS)

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