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FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
EXHIBIT 7.
MEASUREMENT UNCERTAINTY
The measurement uncertainties stated were calculated in accordance with the requirements of NIST Technical Note 1297
and NIS 81 (1994)
7.1.
LINE CONDUCTED EMISSION MEASUREMENT UNCERTAINTY
CONTRIBUTION
(Line Conducted)
EMI Receiver specification
LISN coupling specification
Cable and Input Transient Limiter calibration
Mismatch: Receiver VRC
Γ
LISN VRC
Uncertainty limits 20Log(1+
System repeatability
Repeatability of EUT
Combined standard uncertainty
Expanded uncertainty U
Sample Calculation for Measurement Accuracy in 450 kHz to 30 MHz Band:
√
∑
√
m
2
u
(y) =
u
(y) = +
(1.5
c
i
I=1
U = 2u
(y) = + 2.6 dB
c
ULTRATECH GROUP OF LABS
3000 Bristol Circle, Oakville, Ontario, Canada L6H 6G4
Tel. #: 905-829-1570, Fax. #: 905-829-8050, Email: vhk.ultratech@sympatico.ca, Website: http://www.ultratech-labs.com
•
Assessed by ITI (UK) Competent Body, NVLAP (USA) Accreditation Body & ACA/AUSTEL (Australia)
•
Accredited by Industry Canada (Canada) under ACC-LAB (Europe/Canada MRA)
•
Recognized/Listed by FCC (USA )
•
All test results contained in this engineering test report are traceable to National Institute of Standards and Technology (NIST)
Γ
= 0.03
1
= 0.8(9 kHz) 0.2 (30 MHz)
R
Γ
Γ
)
1
R
2
2
2
+ 1.5
)/3+ (0.5/2)
+ (0.05/2)
PROBABILITY
DISTRIBUTION
Rectangular
Rectangular
Normal (k=2)
U-Shaped
Std. deviation
--
Normal
Normal (k=2)
2
2
+0.35
= + 1.30 dB
FCC ID: MXF-WL211F
UNCERTAINTY (dB)
9-150 kHz
0.15-30 MHz
+1.5
+1.5
+1.5
+1.5
+0.3
+0.5
+0.2
+0.3
+0.2
+0.05
--
--
+1.25
+1.30
+2.50
+2.60
File #: GTT-013FTX
March 17, 2000
Page 63
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