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
| Parameter | Value |
|---|---|
| Display | Dual 4-digit LED displays |
| Monitor Speaker | Built-in speaker with front-panel volume control for audio monitoring of the line |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 / 120 / 220 / 240 VAC (+10%, -13%), 48 to 66 Hz; optional internal rechargeable battery |
| Operating Temperature | 0 to 50 °C |
| Dimensions (W×H×D) | 284 mm × 133 mm × 343 mm |
| Weight | 5.4 kg |
Transmitter
| Parameter | Value |
|---|---|
| Transmitter Frequency Range | 20 Hz to 110 kHz |
| Transmitter Frequency Resolution | 1 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 Steps | 1, 10, 100, 1000, or 10000 Hz |
| Transmitter Fixed Stored Frequencies | 404 Hz, 1004 Hz, 2713 Hz, 2804 Hz |
| Transmitter User-Programmable Frequencies | 4 temporary frequency registers |
| Transmitter Output Level Range | -40 to +13 dBm |
| Transmitter Output Level Resolution | 0.1 dB |
| Transmitter Noise-with-Tone Frequency | 1004 Hz (fixed tone) |
| Transmitter 3-Level Impulse Noise Frequency | 1004 Hz (fixed tone) or quiet terminated (filter dependent) |
| Transmitter Optional P/AR Frequency | Complex 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 Resolution | 1 dB |
Receiver
| Parameter | Value |
|---|---|
| Receiver Frequency Range | 20 Hz to 110 kHz |
| Receiver Level Range | -60 to +13 dBm |
| Receiver Level Resolution | 0.1 dB |
| Receiver Noise-with-Tone Notch Filter Rejection | >50 dB (995 Hz to 1025 Hz) |
| Receiver Noise-with-Tone Range | 10 to 100 dBrn |
| Receiver Signal-to-Noise Ratio Signal Level Range | -40 to +13 dBm |
| Receiver Signal-to-Noise Ratio Range | 10 to 45 dB |
| Receiver 3-Level Impulse Noise Level Range | -40 to +13 dBm |
| Receiver Optional P/AR Range | 0 to 120 P/AR units |
| Receiver Optional P/AR Level Range | -40 to +3 dBm |
| Receiver Optional P/AR Resolution | 1 P/AR unit |
Line Interface
| Parameter | Value |
|---|---|
| Line Termination Impedances | 135, 600, 900 ohms |
| Receiver Bridging Impedance | >50 kohms |
| Loop Holding Current | ≥ 20 mA (typically 24 mA) |
| Line Connectors | WECO 310 (3-pin) jacks for Transmit, Receive, and Dial |
Transmitter Specifications
| Parameter | Value |
|---|---|
| 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 Noise | At least 50 dB below fundamental at 1004 Hz (0 dBm) |
Receiver Specifications
| Parameter | Value |
|---|---|
| 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 Filters | C-Message, 3 kHz Flat, 15 kHz Flat (or Program with Option 003 / 50 kbit with Option 004) |
Impulse Noise Measurement
| Parameter | Value |
|---|---|
| Impulse Noise Dead Time | 125 ms |
| Impulse Noise Count Rate | Maximum 8 counts/second |
| Impulse Noise Timer | 1 to 99 minutes or continuous |
| Impulse Noise Thresholds | Low 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
| Parameter | Value |
|---|---|
| Battery Operation | Up to 5 hours of continuous operation (with Option 001 Battery Pack) |
Inputs & Outputs
| Parameter | Value |
|---|---|
| DC Blocking | Up to 200 Vdc on receiver and transmitter ports |
Power
| Parameter | Value |
|---|---|
| Battery Operating Time | Up to 5 hours (Option 001) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40°C to +75°C (without batteries) |
| Operating Humidity | Up to 95% RH at 40°C |
Receiver Specs
| Parameter | Value |
|---|---|
| Impulse Noise Max Count | 9999 counts |
| Receiver Noise Measurement Range | 0 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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