Specifications

2.3 SELF TEST
When the Model 3380 is turned on, the mi cro pro ces sor per forms a self-test rou tine whereby the en tire RAM and ROM
op er a tion is ver i fied. If there is a mal func tion, such as a de fec tive RAM or ROM, the word “bad” will ap pear in the DIS -
PLAY fol lowed by a num ber 1 or 2. “bad 1” in di cates U16, mi cro pro ces sor is de fec tive and a “bad 2” in di cates U17,
EPROM is de fec tive.
When the self-test pro gram has com pleted, the Model 3380 will re turn to the setup stored in stor age lo ca tion 0. The
Model 3380 is now ready for op er a tion.
2.4 OP ER A TION
2.4.1 Front Panel Con trols and Dis play
2.4.1.1 Chan nel Se lec tion (Mod els 3382 and 3384 only)
The up [∆] con trol key be low the CHAN NEL dis play in cre ments the chan nel num ber. The var i ous dis plays and in di ca -
tors on the front panel (cut off fre quency, gains, etc.) per tain to the chan nel in di cated by this dis play.
2.4.1.2 Set ting Cut off Fre quency
Data en try keys [0] to [9], [.], [KILO] and [MEGA] set the nu meric value of the cut off fre quency de sired. To se lect
1.5kHz, press the [1][.][5] data keys and pa ram e ter keys [KILO] and [FREQ]. The cut off fre quency for the chan nel se -
lected will be in di cated in Hertz on the four digit DIS PLAY (when [ALL CH] mode is se lected, the fre quency will be
changed on all chan nels). The KILO and FREQ keys will be lit.
2.4.1.3 Digit Se lect/Fre quency In cre ment and Dec re ment
When the [SHIFT] key is pressed, fol lowed by the DIGIT SE LECT [∆] or [∇] keys, the FRE QUENCY DIS PLAY will
in ten sify a digit. Press ing the [SHIFT] fol lowed by the [∆] or [∇] key again, will in ten sify the next digit or will turn the
DIGIT SE LECT off. The [∆] will move the in ten si fied digit to the left and the [∇] will move the in ten si fied digit to the
right (di rec tion is la beled in red to the left of keys).
Press ing the [∆] or [∇] keys will then in cre ment or dec re ment the in ten si fied fre quency digit.
2.4.1.4 Set ting In put Gain (Pre-Fil ter)
Up [∆] and down [∇] IN PUT GAIN SET con trols in crease or de crease the in put am pli fier by 10dB. The two digit DIS -
PLAY will in di cate ei ther 0dB, 10dB 20dB, 30dB, 40dB or 50dB. May also be set by en ter ing gain de sired di rectly on
the key pad and press ing ei ther the [∆] or [∇] gain key.
2.4.1.5 Set ting Out put Gain (Post Fil ter)
Up [∆] and down [∇] OUT PUT GAIN SET con trols in crease or de crease the out put am pli fier by 0.1dB steps from 0dB
to 20.0dB. For gains <10dB, 0.1dB res o lu tion is dis played. For gains >10dB, only 1dB res o lu t ion is dis played; how ever,
the up [∆] and down [∇] keys con tinue to in cre ment and dec re ment the gain by 0.1dB. The full 3-digit res o lu tion may be
seen in the mid dle dis play by press ing [SHIFT] the [∆] or [∇] key un der the out put gain dis play. Also for gains >10dB,
the dec i mal point is off for whole dB’s (10, 11, 12, etc.) but on for frac tional (10.1 – 10.9, 11.1 – 11.9, etc.). Gain may
also be set by en ter ing gain de sired di rectly on the key pad and press ing ei ther the [∆] or [∇] gain key.
2.4.1.6 Butterworth or Bessel Se lec tion – [TYPE]
When [TYPE] is pressed once, DIS PLAY in di cates the pres ent fil ter type, “bu.” (Butterworth) and “bES.” (Bessel).
When pressed again, the type will change (i.e. if the type was “bES.” , the change will be to “bu.”.)
Model 3380 Series Section 2 - Operation
2-3