Schedule 13G

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

     INFORMATION TO BE INCLUDED IN THE STATEMENTS FILED PURSUANT TO RULES
     13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)

(Amendment No. 1)*

OSI Systems, Inc.


(Name of Issuer)

Common Stock, no par value per share]


(Title of Class of Securities)

671044105


(CUSIP Number)

February 11, 2002


(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     [   ] Rule 13d-1(b)

     [X] Rule 13d-1(c)

     [   ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 12

SCHEDULE 13G

CUSIP NO. 671044105                                               Page 2 of 12
_____________________________________________________________________________
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

     Cavallo Capital Corp.
_____________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [X]
     (See Item 6)                                           (b) [ ]
_____________________________________________________________________________
3    SEC USE ONLY
_____________________________________________________________________________
4    CITIZENSHIP OR PLACE OF ORGANIZATION
     New York
_____________________________________________________________________________

NUMBER OF      5    SOLE VOTING POWER

SHARES              -0-
               ______________________________________________________________
BENEFICIALLY   6    SHARED VOTING POWER

OWNED BY            505,115 (See Item 4)
               ______________________________________________________________
EACH           7    SOLE DISPOSITIVE POWER

REPORTING           -0-
               ______________________________________________________________
PERSON         8    SHARED DISPOSITIVE POWER

WITH                505,115 (See Item 4)
_____________________________________________________________________________
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     505,115 (See Item 4)
_____________________________________________________________________________
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                       [X]
_____________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     4.1%(See Item 4)
_____________________________________________________________________________
12   TYPE OF REPORTING PERSON*

     CO
_____________________________________________________________________________

                     * SEE INSTRUCTIONS BEFORE FILLING OUT!


SCHEDULE 13G

CUSIP NO. 671044105                                               Page 2 of 12
_____________________________________________________________________________
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

     Pine Ridge Financial Inc.
_____________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [X]
     (See Item 6)                                             (b) [ ]
_____________________________________________________________________________
3    SEC USE ONLY
_____________________________________________________________________________
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     British Virgin Islands
_____________________________________________________________________________

NUMBER OF      5    SOLE VOTING POWER

SHARES              -0-
               ______________________________________________________________
BENEFICIALLY   6    SHARED VOTING POWER

OWNED BY            457,215 (See Item 4)
               ______________________________________________________________
EACH           7    SOLE DISPOSITIVE POWER

REPORTING           -0-
               ______________________________________________________________
PERSON         8    SHARED DISPOSITIVE POWER

WITH                457,215 (See Item 4)
_____________________________________________________________________________
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     457,215 (See Item 4)
_____________________________________________________________________________
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                       [X]
_____________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     3.7%(See Item 4)
_____________________________________________________________________________
12   TYPE OF REPORTING PERSON*

     CO
_____________________________________________________________________________

                     * SEE INSTRUCTIONS BEFORE FILLING OUT!


SCHEDULE 13G

CUSIP NO. 671044105                                               Page 2 of 12
_____________________________________________________________________________
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

     First Investors Holding Co., Inc.
_____________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [X]
     (See Item 6)                                           (b) [ ]
_____________________________________________________________________________
3    SEC USE ONLY
_____________________________________________________________________________
4    CITIZENSHIP OR PLACE OF ORGANIZATION
     British Virgin Islands
_____________________________________________________________________________

NUMBER OF      5    SOLE VOTING POWER

SHARES              -0-
               ______________________________________________________________
BENEFICIALLY   6    SHARED VOTING POWER

OWNED BY            -0- (See Item 4)
               ______________________________________________________________
EACH           7    SOLE DISPOSITIVE POWER

REPORTING           -0-
               ______________________________________________________________
PERSON         8    SHARED DISPOSITIVE POWER

WITH                -0- (See Item 4)
_____________________________________________________________________________
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     -0- (See Item 4)
_____________________________________________________________________________
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                        [X]
_____________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0%(See Item 4)
_____________________________________________________________________________
12   TYPE OF REPORTING PERSON*

     CO
_____________________________________________________________________________

                                  Page 4 of 12

SCHEDULE 13G

CUSIP NO. 671044105                                               Page 2 of 12
_____________________________________________________________________________
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

     Strong River Investments, Inc.
_____________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) [X]
     (See Item 6)                                           (b) [ ]
_____________________________________________________________________________
3    SEC USE ONLY
_____________________________________________________________________________
4    CITIZENSHIP OR PLACE OF ORGANIZATION
     British Virgin Islands
_____________________________________________________________________________

NUMBER OF      5    SOLE VOTING POWER

SHARES              -0-
               ______________________________________________________________
BENEFICIALLY   6    SHARED VOTING POWER

OWNED BY            47,900 (See Item 4)
               ______________________________________________________________
EACH           7    SOLE DISPOSITIVE POWER

REPORTING           -0-
               ______________________________________________________________
PERSON         8    SHARED DISPOSITIVE POWER

WITH                47,900 (See Item 4)
_____________________________________________________________________________
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     47,900 (See Item 4)
_____________________________________________________________________________
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                       [ ]
_____________________________________________________________________________
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.4%(See Item 4)
_____________________________________________________________________________
12   TYPE OF REPORTING PERSON*

     CO
_____________________________________________________________________________

                                  Page 5 of 12



Item 1(a).        Name of Issuer:
                  OSI Systems, Inc. (the "Company").

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  12525 Chadron Avenue, Hawthorne, California 90250

Item 2(a).        Name of Persons Filing:
                  Cavallo Capital Corp. ("Cavallo")
                  Pine Ridge Financial Inc. ("Pine Ridge")
                  First Investors Holding Co., Inc. ("First Investors")
                  Strong River Investments, Inc. ("Strong River")

Item 2(b).        Address of Principal Business Office or, if None, Residence:
                  Cavallo:
                  660 Madison Avenue, 18th floor, New York, NY  10021.
                  Pine Ridge:
                  Gonzalez-Ruiz & Aleman (BVI) Limited, Wickhams Cay I,
                  Vanterpool Plaza,
                  P.O.Box 873, Road Town, Tortolla, BVI.
                  First Investors:
                  Gonzalez-Ruiz & Aleman (BVI) Limited, Wickhams Cay I,
                  Vanterpool Plaza,
                  P.O.Box 873, Road Town, Tortolla, BVI.
                  Strong River:
                  Gonzalez-Ruiz & Aleman (BVI) Limited, Wickhams Cay I,
                  Vanterpool Plaza,
                  P.O.Box 873, Road Town, Tortolla, BVI.

Item 2(c).        Citizenship:
                  Cavallo:
                  New York.
                  Pine Ridge:
                  British Virgin Islands.
                  First Investors:
                  British Virgin Islands.
                  Strong River:
                  British Virgin Islands.

Item 2(d).        Title of Class of Securities:
                  The Company's Common Stock, no par value (the "Common Stock").

Item 2(e).        CUSIP Number:
                  671044105

Item 3.           If this Statement Is Filed Pursuant to Rules 13d-1(b), or
                  13d-2(b) or (c), Check Whether the Persons Filing are a:

                  (a) [ ]  Broker or dealer registered under Section 15 of the
                           Exchange Act;
                  (b) [ ]  Bank as defined in Section 3(a)(6) of the Exchange
                           Act;
                  (c) [ ]  Insurance company as defined in Section 3(a)(19) of
                           the Exchange Act;
                  (d) [ ]  Investment company registered under Section 8 of the
                           Investment Company Act;
                  (e) [ ]  An investment advisor in accordance with Rule
                           13-d(b)(1)(ii)(E);
                  (f) [ ]  An employee benefit plan or endowment fund in
                           accordance with Rule 13d-1(b)(1)(ii)(F);
                  (g) [ ]  A parent holding company or control person in
                           accordance with Rule 13d-1(b)(1)(ii)(G);
                  (h) [ ]  A savings association as defined in Section 3(b) of
                           the Federal Deposit Insurance Act;
                  (i) [ ]  A church plan that is excluded from the definition
                           of an investment company under
                           Section (c)(14) of the Investment Company Act;
                  (j) [ ]  Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

                  If this statement is filed pursuant to Rule 13d-1(c),
                  check this box.     [X]

Item 4.           Ownership.

                  Provide the following information regarding the aggregate
                  number and percentages of securities of the issuer identified
                  in Item 1.

                  Cavallo:

                  (a)      Amount beneficially owned:
                           505,115 of Common Stock(1)

                  (b)      Percent of class:
                           4.1% (based on 12,436,180 of Common Stock
                           outstanding, as reported on the Company's
                           registration statement on Form S-3 filed on
                           December 14, 2001).

                  (c)      Number of shares to which Cavallo has:

                           (i)      Sole power to vote or direct the vote:
                                    -0-

                           (ii)     Shared power to vote or direct the vote:
                                    505,115 shares of Common Stock

                           (iii)    Sole power to dispose or to direct the
                                    disposition of:
                                    -0-

                           (iv)     Shared power to dispose of or direct the
                                    disposition of:
                                    505,115 shares of Common Stock

                  Pine Ridge:

                  (a)      Amount beneficially owned:

_______________

1 (A) Includes 47,900 shares of Common Stock owned by Strong River and 457,215
shares of Common Stock owned by Pine Ridge, and (B) excludes (i) 149,095 shares
of Common Stock issuable upon exercise of a common stock purchase warrant issued
to Pine Ridge by the Company on December 10, 2001 and (ii) 50,000 shares of
Common Stock issuable upon exercise of a common stock purchase warrant issued to
First Investors by the Company on December 10, 2001. The terms of the warrants
preclude each holder from exercising its right with respect to its warrant if
such exercise would result in such holder and its affiliates beneficially owning
in excess of 4.999% or 9.999% of the outstanding shares of Common Stock
following such exercise.

                                  Page 7 of 12

                           457,215 shares of Common Stock(2)

                  (b)      Percent of class:
                           3.7% (based on 12,436,180 shares of Common Stock
                           outstanding, as reported on the Company's
                           registration statement on Form S-3 filed on
                           December 14, 2001).

                  (c)      Number of shares to which Pine Ridge has:

                           (1)      Sole power to vote or direct the vote:
                                    -0-

                           (ii)     Shared power to vote or direct the vote:
                                    457,215 shares of Common Stock.

                           (iii)    Sole power to dispose or to direct the
                                    disposition of:
                                    -0-

                           (iv)     Shared power to dispose of or direct the
                                    disposition of:
                                    457,215 shares of Common Stock.

                  First Investors:

                  (a)      Amount beneficially owned:
                           -0-(3)

                  (b)      Percent of class:
                           0%

                  (c)      Number of shares to which Pine Ridge has:

                           (i)      Sole power to vote or direct the vote:
                                    -0-

                           (ii)     Shared power to vote or direct the vote:
                                    -0- shares of Common Stock.

                           (iii)    Sole power to dispose or to direct the
                                    disposition of:
                                    -0-

_______________

2 Excludes 149,095 shares of Common Stock issuable upon exercise of a common
stock purchase warrant issued to Pine Ridge by the Company on December 10, 2001.
The terms of the warrant preclude the holder from exercising its right with
respect to its warrant if such exercise would result in such holder and its
affiliates beneficially owning in excess of 4.999% or 9.999% of the outstanding
shares of Common Stock following such exercise.

3 Excludes 50,000 shares of Common Stock issuable upon exercise of a common
stock purchase warrant issued to First Investors by the Company on December 10,
2001. The terms of the warrant preclude the holder from exercising its right
with respect to its warrant if such exercise would result in such holder and its
affiliates beneficially owning in excess of 4.999% or 9.999% of the outstanding
shares of Common Stock following such exercise.

                                  Page 8 of 12

                           (iv)     Shared power to dispose of or direct the
                                    disposition of:
                                    -0-
                  Strong River:

                  (a)      Amount beneficially owned:
                           47,900 shares of Common Stock

                  (b)      Percent of class:
                           0.4%  (based on 12,436,180 shares of Common Stock
                           outstanding, as reported on the Company's
                           registration statement on Form S-3 filed on December
                           14, 2001).

                  (c)      Number of shares to which Pine Ridge has:

                           (i)      Sole power to vote or direct the vote:
                                    -0-

                           (ii)     Shared power to vote or direct the vote:
                                    47,900 shares of Common Stock.

                           (iii)    Sole power to dispose or to direct the
                                    disposition of:
                                    -0-

                           (iv)     Shared power to dispose of or direct the
                                    disposition of:
                                    47,900  shares of Common Stock.

Item 5.           Ownership of Five Percent or Less of a Class: On February
                  11, 2002,  Cavallo,  Pine Ridge, First Investors and Strong
                  River ceased to be holders of 5% or more of the Company's
                  Common Stock.

Item 6.           Ownership of More than Five Percent on Behalf of Another
                  Person:

                  Pursuant to an investment management agreement between Pine
                  Ridge and Cavallo, Cavallo has the power to sell or vote on
                  behalf of Pine Ridge, some or all of the shares of Common
                  Stock to which this report relates. Pursuant to an investment
                  management agreement between First Investors and Cavallo,
                  Cavallo has the power to sell or vote on behalf of First
                  Investors, some or all of the shares of Common Stock to which
                  this report relates. Pursuant to an investment management
                  agreement between Strong River and Cavallo, Cavallo has the
                  power to sell or vote on behalf of Strong River, some or all
                  of the shares of Common Stock to which this report relates. As
                  such, under Rule 13d-3(a), Cavallo may be deemed to be the
                  beneficial owner of shares owned by Pine Ridge, First
                  Investors and Strong River.

Item 7.           Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported
                  By the Parent Holding Company.
                  Not applicable.

Item 8.           Identification and Classification of Members of the Group.
                  See the Joint Filing Agreement attached as an exhibit hereto.

Item 9.           Notice of Dissolution of a Group.
                  Not applicable.

                                  Page 9 of 12

Item 10.          Certification.
                  By signing below, the undersigned certifies that, to the
                  best of its knowledge and belief, the securities referred to
                  above were not acquired and are not held for the purpose of
                  or with the effect of changing or influencing the control of
                  the issuer of the securities and were not acquired and are
                  not held in connection with or as a participant in any
                  transaction having such purpose or effect.

                                  Page 10 of 12


                             JOINT FILING AGREEMENT

     In accordance with rule 13d-1(k)(1) of the Securities Exchange Act of 1934,
as amended, the undersigned hereby agree to the joint filing with each other of
the attached statement on Schedule 13G, and all amendments thereto, and that
such statement, and all amendments thereto, is made on behalf of each of them.

     IN WITNESS WHEREOF, the undersigned hereby executed this agreement on
February __, 2002.


                                  Cavallo Capital Corp.

                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  Pine Ridge Financial Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  First Investors Holding Co., Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  Strong River Investments, Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director

                                  Page 11 of 12


                                   SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated: February __, 2002

                                  Cavallo Capital Corp.

                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  Pine Ridge Financial Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  First Investors Holding Co., Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  Strong River Investments, Inc.

                                  By: Cavallo Capital Corp., Investment Manager


                                  /s/ Avi Vigder
                                  -------------------------------------------
                                  Name:    Avi Vigder
                                  Title:   Managing Director


                                  Page 12 of 12