Keysight 33502A 2-Channel 50 Vpp Isolated Amplifier (Pre-Owned)

Key Features At A Glance

• Maximum output level ±25 Vpk (50 Vpp) per channel — two independent channels
• Isolated analog front end floats ±42 Vpk to earth for ground-referenced or floating measurements
• THD+N < 0.01% at 10 kHz, 40 Vpp output (for loads >250 Ω and <400 pF capacitance per datasheet)
• Full-power bandwidth 100 kHz at 50 Vpp; small-signal bandwidth >300 kHz (-3 dB)
• Slew rate >20 V/µs minimum; output drive 200 mA maximum
• Programmable input path: gain of 5x, bypass (1x), or off — switchable without recabling
• Independently configurable input coupling (AC/DC) and input impedance (50 Ω / 1 MΩ)
• LAN (LXI Class-C) and USB 2.0 interfaces standard; SCPI-1994.0 and IEEE-488.2 command compatibility

The Keysight 33502A is a dual-channel isolated amplifier designed to extend the output capability of function and arbitrary waveform generators. It provides a fixed non-inverting gain of 5x with up to ±25 Vpk (50 Vpp) output per channel, paired with a fully isolated analog front end that floats ±42 Vpk relative to earth ground. The 33502A is positioned as a companion instrument for function generators where higher voltage output and low distortion are both required from the same signal path.

Per the datasheet, the 33502A is compatible with existing Keysight function/arbitrary waveform generators including the 33120A, 33210A, 33220A, and 33250A, and can also amplify signals from non-Keysight function and arbitrary waveform generators. The instrument is intended for applications where a generator's native output range is insufficient for the device under test, and where signal fidelity through the amplification stage matters — for example, when driving loads that require higher voltage swing while preserving the waveform integrity of the source generator.

Brand Heritage

Keysight Technologies was formed in 2014 as a spin-off from Agilent Technologies, which itself was spun off from Hewlett-Packard's test and measurement business in 1999. Instruments in the Keysight 335xx function generator and amplifier product family — including the 33502A — carry the engineering lineage of the HP and Agilent function/arbitrary waveform generator product lines that preceded them.

Product Core & Specifications

Feature	Characteristics
General
Number of channels	2
Channel to channel ground connection	Not connected in BYPASS ON. Connected with both channels OFF or in Gain of 5x
Floating Voltage	± 42 Vpk to earth
Input Coupling
AC coupling	Programmable
DC coupling	Default, programmable
Input Impedance
1 MΩ	Default, programmable
50 Ω	Programmable
Input voltage range
Maximum voltage range	± 5 Vpk for gain of 5x, ± 30 Vpk for bypass
Damage level	± 10 Vpk for 50 Ω input; ± 35 Vpk for 1 MΩ input
Input path	Programmable gain of 5x, bypass (1x), or off state
Input gain 5x	5x, Fixed, Non-inverting
Gain accuracy	± 0.1% @ 1 kHz
Flatness DC coupling	0.1%: dc - 10 kHz; 1%: dc - 40 kHz; 5%: dc - 100 kHz
Flatness AC coupling	0.1%: 30 Hz - 10 kHz; 1%: 10 Hz - 40 kHz; 5%: 3 Hz - 100 kHz
Small signal bandwidth	> 300 kHz (–3 dB)
Full power bandwidth	100 kHz @ 50 Vpp output
Input bypass
Bandwidth for 50 Ω system	> 300 MHz (–3 dB)
Maximum current	0.2 Apk
Noise
Input referred noise	< 40 nV/rt-Hz @ 1 kHz
Output configuration and specification
Output current	200 mA (150 mA for continuous output from -8 V to +8 V)
DC output resistance	< 2 Ω
Max output level	± 25 Vpk
Output DC offset	< 10 mV
Output slew rate	> 20 V/µs
THD + N	< 0.01% @ 10 kHz, 40 Vpp
Aberrations	< 5% for waveforms with < 3 V input step or non slewing output
Transition time (Final value ± 1% of step size)	2.5 µSec + 50 nSec/volt of output step
Channel to channel isolation for gains of 5x	> 75 dB
Capacitive Load for no oscillation	< 1 nF
Output protection	Continuous short circuit protection. Thermal overload shutdown. Over temperature status flag.
General characteristics
Power supply	100 V / 120 V / 220 V / 240 V ± 10%
Power line frequency	50–60 Hz ± 10%; 400 Hz ± 10%
Power consumption	100 VA peak (typical value depends on configuration and load)
Operating environment	Full accuracy for 0 to 55 °C; Full accuracy to 80% R.H. at 40 °C Non-condensing
Storage temperature	–40 to 70 °C
Operating altitude	Up to 3000 m
Bench Dimensions (W x H x D)	261.2 mm x 103.8 mm x 303.2 mm
Weight	3.1 kg (6.8 lbs)
Acoustic noise	Normal operating mode: SPL 35 dB(A)
Display	4.3" Color TFT WQVGA (480 x 272), LED backlight
Remote interfaces	10/100 Mbit LAN, USB 2.0 Standard
Language	SCPI – 1994.0, IEEE–488.2
LXI compliance	LXI Class C, Version 1.0

Important: Input damage levels: ±10 Vpk for 50 Ω input selection; ±35 Vpk for 1 MΩ input selection. Maximum input voltage range for the gain-of-5x path is ±5 Vpk; for bypass path, ±30 Vpk. Bandwidth, slew rate, THD+N, aberration, and transition time specifications apply for loads greater than 250 Ω and less than 400 pF of capacitance.Important: Flatness, small-signal bandwidth, full-power bandwidth, max output level, output slew rate, THD+N, aberrations, and transition time specifications apply for all loads > 250 ohms and < 400 pF of capacitance.Important: Gain accuracy is measured with ≥ 1 MΩ load and 1 MΩ input selection.Important: Damage levels: do not exceed ± 10 Vpk on the 50 Ω input or ± 35 Vpk on the 1 MΩ input.Important: Output isolation floats ± 42 Vpk to earth — do not exceed this limit between the amplifier output and earth ground.Recommended pairing: the datasheet states compatibility with Keysight function/arbitrary waveform generators including the 33120A, 33210A, 33220A, and 33250A. The 33502A is designed to be driven by these generators (or by non-Keysight function/arbitrary generators) when the application requires higher output voltage swing or lower distortion than the source generator alone provides.

About this used unit

• Warranty included
• Functional verification included
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.