Rion NA-42, Instruction Manual

Page: 35 / 122

25
Preparations
4. Use the setting ( , ) keys to adjust the sensitivity.
The microphone sensitivity is the value given on the calibration chart
accompanying the microphone (see below).
The preamplifi er loss (caused by static capacitance of microphone and
preamplifi er) is as shown in the table below for various combinations
of microphone and preamplifi er.
Example
1/2-inch condenser microphone UC-52 (sensitivity -32.9 dB) and
preamplifi er NH-17A (loss -0.3):
(-32.9) + (-0.3) = -33.2
The setting is -33.2 (-33.20).
CALIBRATION CHART FOR CONDENSER MICROPHONE UC-52
dB
Open Circuit Sensitivity
-32.9
dB
0dB=1Volt/Pa
22.6
mV/Pa
Cartridge Capacitance:
17.6
pF
Leakage Resistance: > 10
12
at Relative Humidity <85%
Conditions of Tests:
Frequency
1000
Hz
Polarization Voltage:
0
V
Barometric ressur :
765
mmHg
Relative Humidity
50
%
Temperature
25
Frequency Response Characteristics
No.
37564
Date
01-02-03
Signature
0.1 1 10 Hz RP48
20
50 100 200 500 1k 2k 5k 10k 20k 40k
+5
0
-5
-10
-15
The microphone sensitivity
Calibration chart
P
e
UC-27
UC-32P
UC-30
UC-31
UC-33P
UC-26
UC-28
UC-52
UC-53A
UC-29
NH-04 NH-12
NH-06
NH-01 NH-11
NH-17 NH-17A
NH-05
-0.1 -0.4
-0.3
-0.9
-0.4
-0.3
Microphone
Preamplifier
1 inch 1/2 inch 1/4 inch
Unit: dB