Keysight N8973B User Manual

Keysight NFA Series Noise Figure Analyzers Service Guide 35
Overview
Service Equipment You Will Need
Step Attenuator Loss Characterization
The step attenuator combination should have each attenuator setting
characterized by a metrology lab at 50 MHz. The following tables show which
sections of the 10 dB and 1 dB step attenuators are utilized for each attenuator
setting. The tables also list the Allowable Uncertainty for each attenuator
setting. The interconnect cable should NEVER be disconnected once the loss
characterization is performed.
Table 1-2 1 dB Step Attenuator
Nominal Attenuation
(dB)
Attenuator Section Allowable Uncertainty
(dB)
#1
(1 dB)
#2
(2 dB)
#3
(4 dB)
#4
(4 dB)
0 Off Off Off Off 0 (Reference)
1 On Off Off Off < 0.005
2 Off On Off Off < 0.005
3 On On Off Off < 0.005
4 Off Off
On
a
Off < 0.005
5OnOff
On Off < 0.005
6OffOn
On Off < 0.005
7OnOn
On Off < 0.005
8 Off Off On On < 0.005
9 On Off On On < 0.005
a. TME requires that Section 3 be characterized.
Table 1-3 10 dB Step Attenuator
Nominal Attenuation
(dB)
Attenuator Section Allowable Uncertainty
(dB)
#1
(10 dB)
#2
(20 dB)
#3
(40 dB)
#4
(40 dB)
0 Off Off Off Off 0 (Reference)
10 On Off Off Off < 0.010
20 Off On Off Off < 0.015
30 On On Off Off < 0.020
40 Off Off
On
a
Off < 0.025
50 On Off
On Off < 0.030

Keysight N8973B Specifications

General

Brand	Keysight
Model	N8973B
Category	Measuring Instruments
Language	English