PROCEDUREv2.10
LOAD TEST 15-freq/R
UTIL PROMPT /R
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                      MULTI-TRACK TAPE RECORDER TESTS/R
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   The following tests were made with two input switchers and two output/R
   switchers.  The switchers were connected to tracks 10 through 24 of/R
   the 24-track recorder, operating at 30 ips.  Each graph will pause for/R
   examination.  You may use the horizontal arrow keys to move a graphic/R
   cursor on the screen.  To move to the next screen after examining each/R
   graph, press <Enter>./R
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                           FREQUENCY RESPONSE/R
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   The first graph is record-reproduce frequency response.  Notice that the/R
   response of switcher channel 15 (recorder track 24) at low frequency/R
   is different from all the others due to magnetic fringing effects at/R
   the edge of the tape./R
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   Press <Enter> to obtain the graph./E
/F7/F10/E
LOAD TEST 15t-mol3/R
UTIL PROMPT /R
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                       DISTORTION vs AMPLITUDE (MOL)/R
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   The following graph displays 3rd harmonic distortion of the 1 kHz/R
   signal vs recorder input amplitude in dBu.  The tape machine was set/R
   up for 0 VU = +4 dBu.  3rd harmonic-only measurements were obtained/R
   by an FBP-3000 optional filter plugged into socket #3./R
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   Press <Enter> to obtain the graph./E
/F7/F10/E
LOAD TEST 15-crstk/R
UTIL PROMPT /R
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                     WORST-CASE CROSSTALK vs FREQUENCY/R
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   The "complement" mode of the output switchers was used to automatically/R
   drive all input channels of the recorder except the one currently being/R
   measured.  The measurement, in BANDPASS mode to allow measurement below/R
   the wide-band noise level, thus consists of crosstalk coming from all/R
   possible sources simultaneously.  The test proceeds through all channels,/R
   with the generator and bandpass filter sweeping the full audio spectrum/R
   on each channel.  Note that low-frequency crosstalk was lower into the/R
   two outside tracks being tested (switcher channels 1 and 15, tracks 10 and/R
   24) since no signal was being applied to the track beyond in these cases./R
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   Press <Enter> to view the graph./E
/F7/F10/E
LOAD TEST 15-gapsc/R
UTIL PROMPT /R
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                               GAP SCATTER/R
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     One input of the phase meter and one output of the generator were/R
     connected to a center track of the recorder (track 12, switcher channel/R
     3) while the generator output and other input of the phase meter were/R
     scanned across all active channels.  The test was conducted at a 10 kHz/R
     frequency.  The graph thus shows phase difference vertically vs channel/R
     number horizontally.  This is a measurement of how accurately the gaps/R
     in the head are aligned./R
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     Press <Enter> to view the graph./E
/F7/F10/F1/E
RUN EXIT
UTIL END