Ampex 351 - Page 10

Frequency Response
Signal-to-N oise Ratio
15
Flutter and Wow
Rewind Time
2-2
Starting Time
Stopping Time
Tape Width
Tape Speed Pairs
Reproduce Timing
Accuracy
Recording or
Reproducing Time
(NAB 101/2 Inch Diameter
Reels, 2400 feet of tape)
33/4
71/2
15
Speed (ips)
In the portable equipment, one case contains
the tape transport and the other houses the
electronic assembly.
CHARACTERISTICS
89-0144
Issue A
Speed (ips)
3%
7¥2
15
(min)
16
8
4
(min)
8
4
32
Full Track
(hrs)
2
1
when ordering equipment.
Several mounting arrangements are offered
— console, two case portable, and rack mount.
PERFORMANCE
14 -inch
The tape is accelerated to full speed in less than 1/10 of a second.
When operating at 15 ips, the tape moves less than two inches
after the STOP button is pressed.
Accuracy Accuracy Length of Recording
(percentage) (second) (min)
±.2% ±3.6 30
Approximately 1 minute for a full 2,400 foot NAB reel.
Response (Cycles per second)
±2 db 50 to 7,500
±2db40 to 10,000
±4 db 30 to 15,000
±2 db 30 to 15,000
Peak Record Level to
Unweighted Noise (db)
50
60 full track
55 half track or two track
Same as 71/2 ips
Peak record level is that level at which the overall (input to output)
total rms harmonic distortion does not exceed 3 percent when
measured on a 400 cycle tone. Noise is measured when erasing
a signal of peak recording level in the absence of new signal. Bias,
erase and reproduce amplifier noise are included in the measure 
ment. All frequencies between 50 and 15,000 cycles are measured.
Speed (ips) Flutter and Wow
(percentage rms)
33/4 .18%
71/2 .14%
15 .11%
Flutter and wow measurements include all components between
0.5 and 250 cycles. The figure quoted is for the reproduction of a
relatively flutter-free test tape and is measured in accordance with
American Standards Association standard number Z57.1-1954.
(The alternate non-standard method of measuring flutter as de 
scribed in Appendix II of the ASA standard was previously used
by Ampex in determining flutter specifications.)
Half Track
(hrs)
4
2
1
33A -71/2 ips
71/2-15 ips
Speed (ips)
33/4
71/2