Casella CEL CEL-440 - Manual (Page 52)

this range of the sound level meter and ensures the maximum
dynamic range for recording.
7. Record about 30 seconds of the calibration signal.
A calibration signal with a known level is inserted via the sound
level meter and recorded, so that when replayed, it gives an
indication of the record/replay characteristics of the tape.
When the recorded material is to be used for frequency analysis,
it may also be useful to calibrate each tape individually by
recording signals produced by a suitable generator at the
analyser filter band centre frequencies and then replaying them
through the relevant bands.
8. Switch the calibrator OFF and remove it from the microphone.
When the VU reading is estimated (which it usually must be at
these levels), repeatability from one series of recordings to
another may suffer. Therefore, either keep the Record Level
control in the same position for ALL recordings, or perform a
new calibration for EACH series of measurements.
9. Without touching the Record Level on the recorder, if required,
change the measurement range of the instrument to
accommodate the noise (or vibration) signal.
10. Make a note of the range used for measurement.
11. Proceed with recording the noise (or vibration) signal.
4.5.2 Replay
The following guide lines are suggested for replaying sound or vibration
signals.
1. Start from the sound level meter Line Input Calibration screen
(see Section 2.2).
Broadband L ZF measure mode will be selected automatically by
the sound level meter.
2. Connect the recorder output to the instrument IN terminal.
3. Switch the recorder to replay mode.
Page 52 - CEL-440/480 Operators Handbook
Operation