Rion NA-42, Instruction Manual

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Technical Reference
Extension Cable
After impedance conversion by the preamplifi er, the signal from the micro-
phone is fed through an extension cable to the sound level meter. The fol-
lowing extension cables are available as options.
Although the output impedance of the preamplifi er is low, the cable capaci-
tance introduces an upper limit in measurement frequency and measurement
level, which differs depending on the length of the extension cable.
The correlation between preamplifi er output impedance and upper measure-
ment frequency limit is shown in the fi gure below, and the correlation between
cable capacitance and measurement sound pressure level and measurement
frequency is shown on the next page.
EC-04
EC-04A
EC-04B
2 m
5 m
10 m
EC-04C
EC-04D
EC-04E
Condenser microphone extension cable series EC-04
Length
30 m (reel section) + 5 m (link section)
50 m (reel section) + 5 m (link section)
100 m (reel section) + 5 m (link section)
Length
Model Model
20
50
100
200
500
1 k
2 k
5 k
10 k
1 k 2 k 5 k 10 k 20 k 50 k 100 k 200 k 500 k
0.1 F 500 m
40 nF 200 m
20 nF 100 m
10 nF 50 m
4 nF 20 m
Output
impedance
(
)
Frequency (Hz)
Preamplifi er output impedance and upper measurement frequency limit