1 EXHIBIT 12.1 PHASE METRICS, INC. STATEMENT REGARDING COMPUTATION OF RATIOS (IN THOUSANDS, EXCEPT RATIOS) RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS YEAR ENDED DECEMBER 31, ------------------------------------------------ 1993 1994 1995 1996 1997 ---- ------ ------- -------- ------- Earnings: Income (loss) before income taxes and extraordinary items.................. $361 $ 943 $ 6,193 $(19,842) $(9,812) Fixed charges: Interest expense..................... -- 651 5,625 8,448 11,573 Rental expense interest factor(1).... 35 60 178 1,133 1,700 ---- ------ ------- -------- ------- Total fixed charges............. 35 711 5,803 9,581 13,273 ---- ------ ------- -------- ------- Earnings (loss) available to cover fixed charges................................. $396 $1,654 $11,996 $(10,261) $ 3,461 ==== ====== ======= ======== ======= Combined fixed charges and preferred stock dividend requirements(2)................ $ 35 $1,023 $ 8,803 $ 12,581 $16,196 ==== ====== ======= ======== ======= Ratio of earnings (loss) to fixed charges(3).............................. 11.3x 1.0x 1.2x -- -- ==== ====== ======= ======== ======= - --------------- (1) The portion of operating lease rental expense that is representative of the interest factor is deemed to be one-third of total operating lease rental expense. (2) During loss periods, a combined statutory rate of 40% was used for purposes of determining the pre-tax earnings required to cover the preferred stock dividend requirements. (3) For the years ended December 31, 1996 and 1997, earnings were inadequate to cover Fixed Charges by $24.8 and $14.7 million, respectively. For the year ended December 31, 1997, giving effect to the Note Offering as if it has occurred on January 1, 1997, interest expense increased by approximately $3.0 million and earnings were inadequate to cover fixed charges on a pro forma basis by $17.7 million.