Akai GX-2800D-SS User Manual

5. TOTAL HARMONIC DISTORTION
GX-280D-SS
Line
input Line
output
Audio
Frequency
Oscillator
Distortion
Meter
Fig. 5
Connect the measuring instruments as shown in Fig. 5
and record a 1,000 Hz sine wave signal at “0” VU.
Playback the resultant signal and measure the overall
distortion factor, Measure the noise level of the tape
recorder without the tape. Connect the Audio Fre-
quency Oscillator directly to the distortion meter
for measurement of the distortion factor of the
oscillator. The required distortion factor can be
obtained from the results of the above measurement
by the following formula’
dy =d—d, —d,
where, do = Required distortion factor
d = Overall distortion factor
d, = Noise level
d, = Distortion factor of the oscillator
NOTE: When measuring the distortion factor, new
tape should be used.
6. CROSS TALK
1) Between the tracks (2-Channel)
(TAPE)
© @
TAPE
DIRECTION
@®
.
TAPE
DIRECTION
:
WM
Fig. 6
As shown in the figure, first record a 1,000 Hz
sine wave on track No. 3 at +3 VU level. Next,
remove the 1,000 Hz input signal and record under
a non-input condition. Then, playback the tape
on tracks 3 and | (reversed condition of tape)
through the 1,000 Hz B.P.F. (Band Pass Filter,
Sensitivity ... 1: 1) and obtain the ratio between
the two by using the following formula.
= 20 ot (dB)
’ where,
C = Desired cross talk ratio (dB)
Eo = 1,000 Hz signal output level rs
E, = 1,000 Hz cross talk output level
E, = Non-input signal record level Bx@axXy
2) Between the channels (4-Channels)
OME
TAPE
DIRECTION
semewnseaige
=
z
@
Fig. 7
As shown in the figure, first record a 1,000 Hz
sine wave on track No. 1 at +3 VU level. Next,
remove the 1,000 Hz input signal and record under
a non-input condition.
Then, playback the tape on track No. 1 and No. 2
through the 1,000 Hz B.P.F. (Band Pass Filter,
Sensitivity . . . 1: 1) and obtain a ratio between
the two from the following formula.
= 20 logy - (dB)
where,
C = Desired cross talk ratio (dB)
Ey = 1,000 Hz signal output level a= = |
E, = 1,000 Hz cross talk output level
= Nox-input signal record. level RY
|

Akai GX-2800D-SS Specifications

General

Brand	Akai
Model	GX-2800D-SS
Category	Tape Deck
Language	English