Use With Tape Recorder Type 7005/06; Recording With Direct And Fm Units - BRUEL & KJAER 2221 Instruction Manual

4.2. USE WITH TAPE RECORDER 7005/06
In this section only the specific settings for recording with the 2221 /22 are given. For
further explanation and characteristics of the recording, please consult the 7005/06
Instruction Manual.
Check calibration of the 2221/22 (see section 3.4) and carry out the preliminary checks on
the Tape Recorder as described in the 7005/06 Instruction Manual. Connect the 2221 /22
to INPUT socket of the Recorder Unit chosen for recording (use cable AO 0173).
4.2.1. Recording with Direct or FM Units
1. Set the controls of the Sound Level Meter 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:
MODE SWITCH: "AC" or "DC"
INPUT ATTENUATOR: "O ·dB"
METER-MONITOR SWITCH: to the corresponding channel
Make sure the INPUT SWITCH on the Compander Unit is set to "Off" position.
Fit the Sound Level Source over the microphone and start the Source. Using the small
screw-driver supplied adjust the VAR. GAIN potentiometer of the FM or Direct Unit until a
record level of approximately "0 dB" is indicated, and record this level as reference.
The record range obtained depends on the Leq RANGE setting on the Sound Level Meter
and the INPUT ATT. setting on the Recording Unit. See Table 4.1.
INPUT ATT.
Leq RANGE Type 2221/22
Type 7005/06
25-85 45-105
65-125 85-145
0
25-55 45-75 65-95 85- 115
(53,8) (73,8) (93,8) (113,8)
10
30-65 50-85 70- 105 90- 125
(63,8) (83,8) (1 03,8) (123,8)
20
40-75 60-95 80-115 100- 135
(73,8) (93,8) (113,8) (133,8)
30
50-85
70-105 90- 125
110- 145
(83,8) (1 03,8) (123,8) (143,8)
Table 4. 1. Recording range with Direct or FM Units. The equivalent
sound pressure level of the recorded reference on play
back is indicated in parentheses ()
With Leq RANGE on "65-125 dB" and INPUT ATT. on "0 dB", the recording range is
approximately 65-95 dB. The recording range is shifted down when setting the Leq RANGE
to a lower value, and up when setting to a higher value. The range will be shifted up by
10 dB when increasing the INPUT ATT. (provided the measuring range of the meter is not
exceeded).
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