Chatsworth-based Datametrics Corp. said it has retained...

Chatsworth-based Datametrics Corp. said it has retained Hambrecht & Quist Inc. to act as financial adviser to determine whether Datametrics should remain independent or seek affiliation with a larger company . . . Chevron Corp. raised its quarterly common stock dividend to 70 cents a share from 65 cents, payable March 10 to stockholders of record Feb. 6 . . . Heritage Entertainment in Los Angeles signed a definitive agreement to buy the 34-screen Seattle-based Seven Gables Corp. theater chain in Washington and Oregon . . . Alaska Airlines will buy six additional MD-80 aircraft from McDonnell Douglas Corp. The planes and related spare engines are valued at about $180 million and are slated for delivery between May, 1992, and March, 1993.