HP 346 Broadband Noise Source Family

The ideal companion to Hewlett-Packard's noise figure meters and systems is the HP 346 family of noise sources. Since they are broadband, they eliminate the necessity for several sources at different frequency bands. Each source has individually calibrated ENR values at specific frequencies. The calibration is printed on its label for easy loading into the HP 8970B. The low SWR of each noise source reduces a major source of measurement uncertainty reflections of test signals. In addition, the variety of available connectors reduces the need for degrading accuracy with connector adapters. The HP 346 family of noise sources are designed for a broad range of measurement applications. The HP 346C covers the broadest frequency range10 MHz to 26.5 GHz. The high ENR, low SWR, and variety of connectors makes the HP 346B a general-purpose noise source. The HP 346A is designed especially for accurate characterization of input impedance-sensitive devices such as GaAsFETs and UHF amplifiers. Its very small change in re flection coefficient (<0.01) from ON to OFF minimizes errors when measuring noise figure and gain as a function of input impedance.

This product family includes

HP 346A Noise Source, 10 MHz to 18 GHz, 6 dB ENR

HP 346B Noise Source, 10 MHz to 18 GHz

HP 346C Noise Source, 10 MHz to 26.5 GHz

[ Features ]

Broadband 10 MHz to 26.5 GHz
Individually calibrated ENR values
Low SWR

[ Specifications ]

Frequency Range
HP 346 A/B:			10 MHz to 18 GHz
HP 346C:			10 MHz to 26.5 GHz

Excess Noise Ratio (ENR) Limits
HP 346A:			5 to 7 dB
HP 346B:			14 to 16 dB
HP 346C:
	10 MHz to 12 MHz:	12 to 16 dB
	12 to 26.5 GHz:		14 to 17 dB

Maximum SWR (reflection coefficient) On and Off
HP 346A/B
	10 to 30 MHz:		1.3 (0.13)
	30 to 5000 MHz		1.15 (0.07)
	5 to 18 GHz		1.25 (0.11)
HP 346C
	10 MHz to 18 GHz	1.25 (0.11)
	18 to 26.5 GHz		1.35 (0.15)

Power Required:			28 ±1 Vdc

Dimensions
Size:				21 mm W x l40 mm H x 30 mm D
				(0.8 in x 5.5 in x l.2 in)
Weight
	Net:			0.108 kg (3.5 oz)
	Shipping:		0.5 kg (1 lb)

Standard Connector:		APC 3.5 (male)

[ Key Literature ]

If you do not have the Adobe Acrobat Reader necessary for viewing PDF documentation, download your free Acrobat Reader now.

[ Ordering ]

HP 346A Noise Source Opt 001 Type-N (male) Connector Opt 002 APC-7 Connector Opt 004 Type-N (female) Connector Opt 910 Extra Operating Manual Opt W30 Extended Repair Service Opt W32 Calibration Service HP 346B Noise Source Opt 001 Type-N (male) Connector Opt 002 APC-7 Connector Opt 004 Type-N (female) Connector Opt HO1 High ENR Opt H42 DBS Noise Source Opt 910 Extra Operating Manual Opt W30 Extended Repair Service Opt W32 Calibration Service HP 346C Noise Source Opt 910 Extra Operating Manual Opt W30 Extended Repair Service Opt W32 Calibration Service

[ Assistance ]

To help you make the right product choices

Local Sales Office

Related product groups available online:

Noise Figure Meters