Nagra IV-S Service Manual page 29

RECORDING AND PLAYBACK
Nominal recordmq level 0 dB
=
510 nWb/m
Maximum peak recording level + 4 dB
The types of tape for which the machine is adjusted appear in the protocol of measurements.
e.q .:
CCIR version AGFA PEM 468 (15" and 7t")
AGFA PEM 369 (3j")
NAB version SCOTCH 3M 808 (15" , 7t" . 31')
SCOTCH 3M 226 (15" NAGRAMASTER)
Erase efficiency at maximum peak level 83 dB (80 dB)
Frequency response. recorded at - 20 dB:
15
ips
(38.10 cm/s)
from 30 Hz to 20 kHz
±ldB ( ± 2 dB)
7, ips
(19.05 cm/s) from 30 Hz to 15 kHz ±1dB ( ± 2 dB)
3j ips (9.5
em/a)
from 30 Hz
to 10 kHz +2dB (±3 dB) CCIR
3j ips (9.5 cm/s) from 30 Hz
to 8
kHz
±2dB (±3 dB) NAB
Distortion at maximum peak level , 15 IpS STD 3rd harmonic 1% (2%).
Signal-to-noise ratio, record and playback, at maximum peak level:
15 ips (38 cm/s) NAGRAMASTER (13 ps) NAB 74.5 dB (72 dB)
CCIR 75 dB (72 dB)
15 ips (38 crrvs] STD
NAB 70.5 dB (68 dB)
CCIR 71 dB (69 dB)
7,
ips
(19
ern's)
STD NAB 68 dB (65 dB)
CCIR 69 dB (64 dB)
Non-pilot version (wide track)
Signal-to-noise ratio improved by approximately 1.5 dB
Phase fluctuation between channels 7i ips (19.05 cm/s), 10 Khz + 5 ° (±200)
Cross talk during record and playback 1 Khz 60 dB (50 dB)
10 Khz 50 dB (40 dB)
Insertion of a noise redu ction system (NAS) .
low impedance output to NAS. voltage for 0 dB on the modulomeler 560 mV.
Input for NAS, impedance approximately 10 kOhm, voltage for 0 dB on the modulometer 560 mV.
OUTPUTS
line output voltage at 5 kOhm, for 0 dB on the modulometer 1 V.
Maximum output voltage for 5 kOhm , giving 1% distortion at 1 kHz V (2.8 V).
Maximum output voltage to 200 Ohm headphones, for 0 dB rnodulometer. at 1 kH z
=
560 mV
±20 mV.
June 1988
I 1.9-4