Tonghui TH2840 Series - Page 133

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When the test speed is MEDIUM or SLOW, select the value in the top, such as 0.05.
When the test speed is FAST, select the value in the bottom, such as 0.1.
When in the boundary line of the frame, select a smaller value.
The basic measurement accuracy factor A is applicable to test level range of 500mVrms--1.0Vrms.
When exceeding this level range, select the value of A
L
according to Table A, the current basic
measurement accuracy is obtained by calculating A
L
A.
Where, V
s
is test signal voltage.
Table A Level correction factor A
L
Test signal voltage Vs (Vrms)
[50m, 5m]
[200m, 50m)
[500m, 200m)
[1 , 500m )
[10, 1 )
2.5×50mVrms / Vs
2.5
500mVrms / Vs
1
2
Figure B shows the level correction factor A
L
in graphic method according to the data listed in Table
A.
8.3.11.2 Figure B Level correction factor AL curve
Table B Impedance rate factors: K
a
, K
b
Speed
Frequency
K
a
K
b
Medium
Slow
f
m
1.2kHz
msm fVZ
100
)
200
1)(
101
(
3



ms
m
fV
Z
100
)
70
1)(103.0(
9


1.2kHzfm
≤8kHz
)
200
1)(
101
(
3
sm VZ



)
70
1)(101(
9
s
m
V
Z 
