What are the sweep time capabilities of these analyzers?

Both the Advantest U3641 and Advantest U3661 can sweep as fast as 50 µs in zero span mode. For non-zero spans, the U3641 has a sweep time range of 50 ms to 1000 s, while the U3661 covers a range from 20 ms to 1000 s.

Does the U3641 offer narrow resolution bandwidths?

Yes. While the standard resolution bandwidth of the Advantest U3641 starts at 1 kHz, optional 100 Hz and 300 Hz RBW filters can be added for high-selectivity measurements.

Advantest U3600 Series Spectrum Analyzers

2 models with full specifications from Advantest.

The Advantest U3600 series consists of portable, lightweight spectrum analyzers developed for field installation, service, and maintenance of modern communication equipment. Built with a highly mobile form factor, these instruments share key architectural elements, including a 6-inch color TFT display and an adaptable three-way power system. By supporting AC line voltage, external DC, or a rechargeable battery pack, the series ensures operational readiness in remote or demanding environments. The family is represented by two primary instruments: the Advantest U3641, which covers RF frequencies up to 3 GHz, and the Advantest U3661, which extends measurement capabilities into the microwave region up to 26.5 GHz.

Frequency Range: 9 kHz to 26.5 GHz (series maximum)
Display Size: 6-inch TFT Color LCD
Power Sources: AC Line, External DC, or Battery Pack
Operating Temperature: 0 to 50 °C

Models in this series

Model	Type	Dimensions (W×H×D)	Display	External Trigger Input
U3641	*misc	291 mm × 148 mm × 330 mm	6-inch TFT color LCD	BNC female, TTL level
U3661	*misc	291 mm × 177 mm × 331 mm (without handle and feet)	6-inch active matrix color TFT LCD	TTL level, BNC female

Shared Architecture and Portability Features

Both models in the U3600 series are housed in compact enclosures designed to withstand field operation. They share an operating temperature range of 0 to 50 °C and feature a frequency reference temperature stability of ±5 ppm within this range, alongside an aging rate of ±2 ppm per year.

For power flexibility, both units can run off standard AC mains or an optional battery pack. For external DC operation, the Advantest U3641 accepts 11 to 17 VDC (consuming 45 W or less), while the Advantest U3661 accepts +10 to +16 VDC. Each instrument also features a 6-inch color TFT LCD screen for clear visualization in diverse lighting conditions and includes PCMCIA memory card slots and RS-232 interfaces for data logging and system integration.

Advantest U3641 RF Spectrum Analyzer

The Advantest U3641 is optimized for lower-frequency RF systems, offering a frequency range of 9 kHz to 3 GHz. It is particularly well-suited for standard communication infrastructure maintenance.

Frequency Span: 50 kHz to 3 GHz, plus Zero Span.
Bandwidth Control: Standard resolution bandwidth (RBW) from 1 kHz to 1 MHz in a 1-3 sequence, with optional narrower filters of 100 Hz and 300 Hz. Video bandwidth (VBW) ranges from 10 Hz to 1 MHz.
Sensitivity and Range: Measurement range extends from -117 dBm to +30 dBm with the preamplifier off, and down to -135 dBm with the internal preamplifier active. The maximum safe input level is +30 dBm with at least 10 dB of attenuation.
Connectivity: Equipped with two PCMCIA slots (Type I/II), RS-232, and optional GPIB.

Advantest U3661 Microwave Spectrum Analyzer

For applications requiring higher frequency limits, the Advantest U3661 expands coverage from 9 kHz up to 26.5 GHz. This makes it suitable for microwave links, satellite communications, and laboratory-grade analysis in a portable frame.

Frequency Span: 50 kHz to 26.5 GHz, plus Zero Span.
Phase Noise: Features sideband noise performance of -100 dBc/Hz or less at a 10 kHz offset.
Bandwidth Control: Standard RBW ranges from 1 kHz to 3 MHz in a 1-3 sequence, with VBW also adjustable up to 3 MHz.
Level and Attenuation: Features an integrated 0 to 50 dB input attenuator adjustable in 10 dB steps, with a reference level range from -64 dBm to +30 dBm.
Connectivity: Standard GPIB, RS-232, and PCMCIA interfaces are built directly into the unit.

Frequently asked questions

What are the sweep time capabilities of these analyzers?: Both the Advantest U3641 and Advantest U3661 can sweep as fast as 50 µs in zero span mode. For non-zero spans, the U3641 has a sweep time range of 50 ms to 1000 s, while the U3661 covers a range from 20 ms to 1000 s.
Does the U3641 offer narrow resolution bandwidths?: Yes. While the standard resolution bandwidth of the Advantest U3641 starts at 1 kHz, optional 100 Hz and 300 Hz RBW filters can be added for high-selectivity measurements.