BRUEL & KJAER 2221 - Recording with the Compander Unit

Example: Leq RANGE "65-125 dB" and INPUT ATT. "30 dB" gives a recording range of 90-
125 dB (125 dB being the higher limit of the measuring range).
4.2.2.
Recording with the Compander Unit
22
Connect the cable AO 0173 to DIRECT INPUT of the relevant channel of the Compander
Unit.
1. Set the controls of the 2221 /22 as follows:
FUNCTION: "Leq"
Leq RANGE: "65-125"
MODE: "Run"
POWER: "On"
2. Set the controls of the recording channel of the Tape Recorder as follows:
INPUT SWITCH: "Lin."
COMPANDER MODE: see 7005/06 Instruction Manual
INPUT ATTENUATOR: "0, 1 V"
METER-MONITOR SWITCH: to the corresponding channel
3. Fit the Sound Level Source over the microphone and start the Source. Record this
signal for reference.
The record range obtained depends on the Leq RANGE setting on the Sound Level Meter
and of the INPUT ATT. setting on the Compander Unit. See Table 4.2.
INPUT ATT.
Leq RANGE
Type 2221/22
Type 7005/06
25-85 45-105 65-125 85-145
0,1V
25-60
45-80 65-100 85- 120
(53,8) (73,8) (93,8) (113,8)
1V
25-80 45- 100
65-120 85-140
(73,8) (93,8)
(113,8) (133,8)
Table 4.2. Recording range with Compander Unit. The equivalent
sound pressure level of the recorded reference on play
back is indicated in parentheses ()