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Agilent N8973A, N8974A, N8975A NFA Series Noise Figure Analyzers
Data Sheet
Specifications
Specifications are only valid for the stated operating frequency, and apply over 0 C to +55 C unless otherwise noted. The analyzer will meet its specifications after 2 hours of storage within the operating temperature range, 60 minutes after the analyzer is turned on, with Alignment running. A user calibration is required before corrected measurements can be made.
Frequency
Frequency range1 N8973A N8974A N8975A 10 MHz to 3.0 GHz 10 MHz to 6.7 GHz 10 MHz to 26.5 GHz
Measurement bandwidth (nominal) N8973A, N8974A, N8975A Frequency reference Aging Temperature stability Settability Standard2 < 2 ppm4/year < 6 ppm < 0.5 ppm Opt.1D53 < 0.1 ppm/year < 0.01 ppm < 0.01 ppm 4 MHz, 2 MHz, 1 MHz, 400 kHz, 200 kHz, 100 kHz
Tuning accuracy 5 (start, stop, center, marker) 4 MHz measurement bandwidth (default on all models of noise figure analyzer) Frequency 10 MHz - 3.0 GHz 3.0 GHz - 26.5 GHz Error < reference error + 100 kHz < reference error + 400 kHz
< 4 MHz- measurement bandwidth (functionality not present in N8972A) Frequency 10 MHz - 3.0 GHz 3.0 GHz - 26.5 GHz Error < reference error + 20 kHz < reference error + 20% of measurement bandwidth
1. The N8974A and N8975A models have a mechanical switch fitted. This switch allows the analyzers to change between the 10 MHz to 3.0 GHz and the 3.0 GHz to 6.7 GHz frequency range on the N8974A. On the N8975A, the switch allows the change between the 10 MHz to 3.0 GHz and the 3.0 GHz to 26.5 GHz frequency range. If the current measurement frequency range crosses the 3.0 GHz point, the switch will operate. The mechanical switch has a limited number of cycles over which it is reliable. To maximize the reliable life of the switch, switching over the 3.0 GHz frequency point should be kept to a minimum. 2. Temperature stability on the standard frequency reference is achieved 60 minutes after the analyzer is turned on. 3. Option 1D5 recommended for applications requiring high frequency stability. 4. Parts per million (10-6). 5. Tuning accuracy is dependent on measurement bandwidth.
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Noise figure and gain
Performance is dependent on the ENR1 of the noise source used:
N8973A, N8974A and N8975A
(10 MHz to 3.0 GHz) Noise figure Gain2 Measurement range Instrument uncertainty Measurement range Instrument uncertainty 4-7 dB
Noise source ENR
12-17 dB 20-22 dB 0 to 20 dB < 0.05 dB 0 to 30 dB 0 to 35 dB < 0.05 dB < 0.1 dB -20 to +40 dB < 0.17 dB
N8974A and N8975A
(>3.0 GHz) Noise figure Gain2 Measurement range Instrument uncertainty Measurement range Instrument uncertainty 4-7 dB 0 to 20 dB < 0.15 dB
Noise source ENR
12-17 dB 20-22 dB 0 to 30 dB 0 to 35 dB < 0.15 dB < 0.2 dB -20 to +40 dB < 0.17 dB
For NFA models that either have a serial prefix less than GB4446 or are fitted with the Noise Figure RF board, N8972-60001.
Instrument's own noise figure
Frequency Noise figure Noise figure over a limited temperature range of 23 C 3 C
10 MHz to < 500 MHz 500 MHz to < 2.3 GHz 2.3 GHz to 3.0 GHz > 3.0 GHz to 13.2 GHz > 13.2 GHz to 26.5 GHz
< 4.9 dB + (0.0025 * freq in MHz) < 7.4 dB + (0.00135 * freq in MHz) 4.9 dB + (0.0015 * freq in MHz) < 12.0 dB < 16.0 dB
< 4.4 dB + (0.0025 * freq in MHz) < 5.9 dB + (0.00135 * freq in MHz) < 2.9 dB + (0.0015 * freq in MHz) < 10.5 dB < 12.5 dB
For NFA models that either have a serial prefix greater than GB4446 or are fitted with the Noise Figure RF board, N8972-60101.
Instrument's own noise figure
Frequency Noise figure Noise figure over a limited temperature range of 23 C 3 C
10 MHz to 3.0 GHz > 3.0 GHz to 13.2 GHz > 13.2 GHz to 26.5 GHz
< 4.8 dB + (0.00124 * freq in MHz) < 12.0 dB < 16.0 dB
< 4.4 dB + (0.00117 * freq in MHz) < 10.5 dB < 12.5 dB
1. 2.
Excess noise ratio For measurement bandwidths below 4 MHz, and spacing between measurement points below 3 MHz, gain uncertainty may increase to a maximum of 0.7 dB.
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Characteristic1 noise figure at 23 C 3 C (10 MHz to 3.0 GHz) For NFA models that have either a serial prefix of GB4446 or greater or are fitted with Noise Figure RF board, N8972-60101.
Characteristic1 noise figure at 23 C 3 C (3.0 GHz to 26.5 GHz)
Maximum external gain between noise source output and RF input2 > 65 dB Averaging Up to 999 measurement results Jitter3 Jitter with no averaging4 5 dB Y-factor standard deviation < 0.1 dB
1. 2. 3. 4.
Characteristic values are met or bettered by 90% of instruments with 90% confidence. Subject to maximum operating input power. Specified for a 4 MHz measurement bandwidth. Jitter in noise figure is equivalent to jitter in Y-factor to within 10% for ENR > 14 dB and F < 4 dB. At minimum smoothing, jitter can limit accuracy; the small jitter at high smoothing does not. For true Gaussian noise, jitter reduces with increased averaging typically by a factor of 1/(number of averages).
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RF input
Connector N8973A N female, 50 nominal N8974A, N8975A APC 3.5 (m), 50 nominal (ESD sensitive) SWR (50 reference) For NFA models that have either a serial prefix less than GB4446 or are fitted with Noise Figure RF board, N8972-60001. 10 MHz to 500 MHz Input VSWR Test Record 1.6:1 500 MHz to 1000 MHz 1.8:1 1000 MHz to 1500 MHz 1.9:1 1500 MHz to 3000 MHz 1.8:1 3000 MHz to 6700 MHz 1.3:1 6700 MHz to 20000 MHz 2.1:1 20000 MHz to 26500 MHz 2.4:1
For NFA models that have either a serial prefix of GB4446 or greater or are fitted with Noise Figure RF board, N8972-60101. 10 MHz to 500 MHz to 1.5 GHz to 3 GHz to 500 MHz 1.5 GHz 3 GHz 6.7 GHz SWR < 1.5:1 < 1.7:1 < 1.8:1 < 1.3:1 6.7 GHz to 20 GHz to 20 GHz 26.5 GHz < 2.1:1 < 2.4:1
Characteristic1 SWR at 23 C 3 C (10 MHz to 3.0 GHz) For NFA models that have either a serial prefix of GB4446 or greater or are fitted with Noise Figure RF board, N8972-60101.
1.
Characteristic values are met or bettered by 90% of instruments with 90% confidence.
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Characteristic1 SWR at 23 C 3 C (3.0 Ghz to 26.5 Ghz)
Maximum operating input power2 -10 dBm Maximum protected input level 20 Vdc; +15 dBm peak (or average) at RF
1. 2.
Characteristic values are met or bettered by 90% of instruments with 90% confidence. This is the total wide-band noise power. Contributing factors are: Noise source ENR, external gain, noise figure and bandwidth (including DUT).
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Measurement
Sweep Number of points Setting Sweep trigger Measurement speed1 (nominal) N8973A ( 10 MHz to 3.0 GHz) N8974A ( 10 MHz to 3.0 GHz) N8974A ( 3.0 GHz to 6.7 GHz) N8975A ( 10 MHz to 3.0 GHz) N8975A ( 3.0 GHz to 26.5 GHz) Modes Amplifier Downconverter in DUT 8 averages < 50 ms/measurement 8 averages < 50 ms/measurement < 70 ms/measurement < 50 ms/measurement < 70 ms/measurement 64 averages < 42 ms/measurement 64 averages < 42 ms/measurement < 50 ms/measurement < 42 ms/measurement < 50 ms/measurement 2 to 401, or fixed frequency Start/stop, center/span, Frequency list of up to 401 points Continuous or single
Upconverter in DUT
System downconverter
Loss compensation
SNS Series noise source
With fixed or variable IF. Instrument capable of controlling an external LO via dedicated 'LO GPIB' connector With fixed or variable IF. Instrument capable of controlling an external LO via dedicated 'LO GPIB' connector Allows the use of an external downconverting mixer as part of the measurement system. Instrument capable of controlling an external LO via dedicated 'LO GPIB' connector Table of values vs. frequency for losses between noise source and DUT, and between DUT and analyzer ENR tables automatic upload. Continuous upload of Tcold
1. 2.
Corrected Noise Figure and Gain measured on a 3 dB pad with a repetitive sweep of 101 points from 600 MHz to 1.0 GHz with a 4 MHz measurement bandwidth. Corrected Noise Figure and Gain measured on a 3 dB pad with a repetitive sweep of 101 points from 4.0 GHz to 6 GHz with a 4 MHz measurement bandwidth.
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Display
Type Output format Display channels Number of markers Limit lines Display units Noise figure Gain Y-factor Effective noise temperature Phot Pcold 17 cm color LCD panel Graphical, table of values, or meter mode 2 4 per display channel Upper and lower for each of 2 channels Noise figure (F dB), or as a ratio (F) Gain (G dB), or as a ratio (G) Y-factor (Y dB) or as a ratio (Y) Effective input noise temperature in Kelvin, C, F Relative power density in dB or as a ratio Relative power density in dB or as a ratio
Connectivity
GPIB LO GPIB Serial Printer IEEE-488 bus connector IEEE-488 bus connector dedicated to local oscillator control (SCPI or custom command set) RS-232, 9-pin D-Sub male 25-pin parallel D-Sub female, for connection with IEEE 1284 cable to a PCL3 or PCL5 compatible printer 15-pin mini D-Sub female1 +15 Vdc, -12.6 Vdc at 150 mA max. 50 nominal BNC (f), > 0 dBm 50 nominal BNC (f), -15 to +10 dBm 50 -type BNC (f) On: 28.0 V 0.1 V at up to 60mA peak Off: < 1 V For use with Agilent Technologies' SNS Series noise sources
VGA output Probe power (nominal) 10 MHz Ref out 10 MHz Ref in BNC noise source drive output Connector type Output voltage SNS noise source connector
1.
31.5 kHz horizontal, 60 Hz vertical sync rates, non-interlaced, analog RGB 640 x 480.
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General specifications
Data storage (nominal) Internal drive Floppy disk Power requirements On (line 1) 30 traces, states or ENR tables 30 traces, states or ENR tables 90 to 132 V rms, 47 to 440 Hz 195 to 250 V rms, 47 to 66 Hz Power consumption< 300 W <5W 222mm(H) x 410mm(D) x 375mm(W) 222mm(H) x 515mm(D) x 409mm(W)
Standby (line 0) Dimensions Without handle With handle (max)
Weight (typical, without options) N8973A 15.5 kg (34.2 lbs.) N8974A 17.5 kg (38.61 lbs.) N8975A 17.5 kg (38.61 lbs.) Audible noise < 42 dBa pressure and < 5.0 bels power (ISODP7779) Temperature range Operating Storage Humidity range Operating Altitude range Operating 0 C to +55 C -40 C to +70 C Up to 95% relative humidity to 40 C (non-condensing) to 4,600 meters
Calibration interval 1-year minimum recommended
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Electromagnetic Compatibility This product conforms with the protection requirements of European Council Directive 89/336/EEC for Electromagnetic Compatibility (EMC). The conformity assessment requirements have been met using the technical construction file route to compliance, using EMC test specifications EN 55011:1991 (Group 1, Class A) and EN 50082-1:1992. In order to preserve the EMC performance of the product, any cable which becomes worn or damaged must be replaced with the same type and specification.
Radio-Frequency Electromagnetic Field Immunity When a 3 Vm-1 radio-frequency electromagnetic field is applied to the noise figure analyzer according to IEC 61000-4-3:1995, degradation of performance may be observed. When the frequency of the incident filed matches the frequency of a measured noise figure or gain, the values displayed will deviate from those expected. This phenomenon will only affect that specific frequency, and the analyzer will continue to perform to specification at all other frequency sample points. The noise figure analyzer may be unable to calibrate a chosen frequency sample point, if the frequency matches that of an incident electromagnetic field.1
1. Radiated immunity testing. When tested at 3 V/m, according to IEC 801-3/1984, the displayed average noise level will be within specifications over the full immunity test frequency range of 27 MHz to 500 MHz except at the immunity test frequencies of 223.5714 MHz +/- selected resolution bandwidth, and 437.1429 MHz +/- selected resolution bandwidth, where the displayed average noise level can be up to -45 dBm. When the noise figure analyzer tuned frequency is identical to these immunity test frequencies, the measurements could be corrupted and there may be signals of up to -70 dBm displayed on the screen.
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For further information
Key literature:
Please visit the Agilent noise figure analysis web site for on-line access to literature or contact your local Agilent sales office or representative. Noise Figure Analyzers - NFA Series - Brochure, literature number 5980-0166E Noise Figure Analyzers - NFA Series - Configuration Guide, literature number 5980-0163E Fundamentals of RF and Microwave Noise Figure Measurements, Application Note 57-1, literature number 5952-8255E Noise Figure Measurement Accuracy, Application Note 57-2, literature number 5952-3706E 10 Hints for Making Successful Noise Figure Measurements; Application Note 57-3, literature number 5980-0288E
Key web resources:
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www.agilent.com/find/aerospace
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Revised: May 7, 2007
Product specifications and descriptions in this document subject to change without notice. (c) Agilent Technologies, Inc. 2001- 2007 Printed in USA, November 5, 2007 5980-0164E

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