<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
Bioanalytical  Systems, Inc. consolidated  financial statements contained in the
Company's  quarterly  report on Form 10-Q and is  qualified  in its  entirety by
reference to such financial statements.

<MULTIPLIER>                    1000

                                                   
<PERIOD-TYPE>                  3-MOS                     9-MOS
<FISCAL-YEAR-END>              SEP-30-2000               SEP-30-2000
<PERIOD-START>                 APR-01-2000               OCT-01-2000
<PERIOD-END>                   JUN-30-2000               JUN-30-2000
<CASH>                                 676                       676
<SECURITIES>                             0                         0
<RECEIVABLES>                        2,861                     2,861
<ALLOWANCES>                             0                         0
<INVENTORY>                          2,077                     2,077
<CURRENT-ASSETS>                     5,940                     5,940
<PP&E>                              18,867                    18,867
<DEPRECIATION>                       7,191                     7,191
<TOTAL-ASSETS>                      25,969                    25,969
<CURRENT-LIABILITIES>                4,938                     4,938
<BONDS>                                  0                         0
<PREFERRED-MANDATORY>                    0                         0
<PREFERRED>                              0                         0
<COMMON>                             1,011                     1,011
<OTHER-SE>                          15,486                    15,486
<TOTAL-LIABILITY-AND-EQUITY>        25,969                    25,969
<SALES>                              2,924                     6,077
<TOTAL-REVENUES>                     5,452                    13,987
<CGS>                                1,013                     2,157
<TOTAL-COSTS>                        3,291                     9,019
<OTHER-EXPENSES>                     2,249                     6,053
<LOSS-PROVISION>                         0                         0
<INTEREST-EXPENSE>                    (135)                     (377)
<INCOME-PRETAX>                       (214)                   (1,443)
<INCOME-TAX>                           (75)                     (505)
<INCOME-CONTINUING>                   (139)                     (938)
<DISCONTINUED>                           0                         0
<EXTRAORDINARY>                          0                         0
<CHANGES>                                0                         0
<NET-INCOME>                          (139)                     (938)
<EPS-BASIC>                           (.03)                     (.21)
<EPS-DILUTED>                         (.03)                     (.21)