54120B

Keysight Technologies (Agilent HP)Mainframe

The Keysight (formerly Agilent / HP) 54120B is a high-performance digitizing oscilloscope mainframe designed for high-speed digital, telecommunications, microwave, and time-domain reflectometry (TDR) measurements. Used in conjunction with HP 54120-series sampling test sets, it offers exceptional stability, precise 12-bit vertical resolution, and fully programmable control via HP-IB.

RF and Microwave Signal Integrity Time Domain Reflectometry

Specifications

General

Parameter	Value
Interfaces	HP-IB (IEEE-488)
Display	9-inch color CRT

Physical

Parameter	Value
Power Supply	115 / 230 V AC (-25% to +15%), 48 to 66 Hz, 200 VA max
Operating Temperature	15°C to 35°C (for full accuracy); 0°C to 55°C (operating limit)
Dimensions (W×H×D)	425.4 mm × 194.3 mm × 563.9 mm

System Performance & Architecture

Parameter	Value
Compatible Test Sets	HP 54121A (20 GHz), HP 54122A (12.4 GHz), HP 54123A (34 GHz), HP 54124A (50 GHz)
Vertical Resolution	12 bits (up to 14 bits with averaging)
Maximum Number of Channels	4 channels (test-set dependent)
Waveform Record Length	501 points or 1024 points (user selectable)

Horizontal System & Timebase

Parameter	Value
Mainframe Time Base Range	10 ps/div to 1 s/div
Time Base Resolution	10 fs (via averaging/interpolation)
System Jitter (RMS)	< 2.5 ps RMS + 5 ppm of delay

Acquisition Modes & Processing

Parameter	Value
Acquisition Modes	Equivalent time sampling, averaging, persistence
Number of Averages	1 to 2048 (selectable in binary steps)
Waveform Math Functions	Addition, subtraction, multiplication, division, integration, differentiation

Measurement & Display Capabilities

Parameter	Value
Automatic Parametric Measurements	Rise time, fall time, frequency, period, positive width, negative width, duty cycle, preshoot, overshoot, Vp-p, Vmax, Vmin, Vtop, Vbase, Vrms, Vmean
Cursor Types	Dual voltage and time cursors with continuous delta readouts

Environmental & Safety

Parameter	Value
Storage Temperature Range	-40°C to +75°C
Operating Humidity	Up to 95% relative humidity at 40°C
Operating Altitude	Up to 4,600 m (15,000 ft)
Calibration Interval	1 year

System Architecture

Parameter	Value
CPU	Motorola 68000
Floating Point Coprocessor	Motorola 68881

Storage

Parameter	Value
Non-Volatile Waveform Memories	4

Triggering

Parameter	Value
Direct Trigger Frequency Range	DC to 2.5 GHz
Direct Trigger Input Impedance	50 Ω (nominal)
Direct Trigger Maximum Input Voltage	±5 V (DC + peak AC)
Direct Trigger Sensitivity (DC to 100 MHz)	40 mV p-p
Direct Trigger Sensitivity (100 MHz to 2.0 GHz)	100 mV p-p
Direct Trigger Sensitivity (2.0 GHz to 2.5 GHz)	200 mV p-p

Timebase

Parameter	Value
Option 001 External Reference Input Frequency	1, 2, 5, or 10 MHz
Option 001 External Reference Input Impedance	50 Ω
Internal Timebase Reference Output Frequency	10 MHz

Connectivity & Output

Parameter	Value
Hardcopy Print Support	HP-GL plotters, HP ThinkJet, QuietJet, and LaserJet printers

General & Environmental

Parameter	Value
Cooling	Forced air by rear-panel fan
Electromagnetic Interference Compliance	FTZ 526/1969, VDE 0871 Level B

Connectivity

Parameter	Value
External Monitor Outputs	4 BNC female connectors (Red, Green, Blue, Sync)
IEEE-488 (HP-IB) Interface Codes	SH1, AH1, T5, TE0, L3, LE0, SR1, RL1, PP1, DC1, DT1, C0, E2

Acquisition

Parameter	Value
Maximum Sampling Rate	100 kHz
A/D Converter Resolution	12 bits

Power

Parameter	Value
Line Voltage Range	90 to 132 V AC / 198 to 264 V AC
Line Frequency Range	48 to 66 Hz
Maximum Power Consumption	200 VA

Technology

Sampling Oscilloscope

Applications

High-speed digital design, time-domain reflectometry (TDR), microwave circuit characterization, and high-speed telecom analysis