Tonghui TH2827 Series - Page 79

TH2827 Series Operation Manual Chapter 7 Command Reference
73
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 ) [2 , 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.
Figure B Level correction factor A
L
curve
Table B Impedance rate factor: K
a
, K
b
Speed Frequency Ka Kb
Medium
Slow
fm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 

8kHzfm
150kHz
)
70
1)(103(
9
s
m
V
Z 
