Modulometer - Nagra PORTABLE ANALOGUE AUDIO TAPE RECORDER Instruction Manual

MODULOMETER

Integration time for - 2 dB
Usable scale
Frequency response
from 40 Hz to 20 kHz
RECORDING AND PLAYBACK CHAIN
Nominal recording level
Maximum peak level (M.P.L.)
Magnetic tape used for Calibration :
CCIR
NAB
Erasing efficiency
CCIR
NAB
Frequency response, recording at 20 dB below M.P.L.
15 ips (38 cm/s) CCIR and NAB 30 Hz to 20 kHz ±1.5 dB
7½ ips (19 cm/s) CCIR and NAB 30 Hz to 15 kHz ±1.5 dB
3¾ ips (9,5 cm/s) CCIR and NAB 30 Hz to 8 kHz ±2.0 dB
Distortion at M.P.L :
CCIR
NAB
Signal-to-noise ratio of the playback chain only, with motor running and leader tape, ASA A
weighted, M.P.L 83 dB
Recording-playback signal-to-noise ratio at M.P.L at 7½ ips
LN
STD
LN
STD
LN
STD
3rd harmonic
2nd harmonic
3rd harmonic
2nd harmonic
Linear
NAB 64 dB
CCIR 62 dB
NAB 64 dB
CCIR 62 dB
7.5 ms
-30 to +5 dB
±0,5 dB
0 dB= 320 nWb/m
+ 4 dB
PEM 468
PER 368
3M 808
3M 806
84 dB
88 dB
0,4%
0,3%
1,0%
0,4%
ASA A
Weighted
73 dB
72 dB
70 dB
68 dB