22
C MODEL
B
2400B EXTERNAL DC POWER AND BATTERY OPERATION
The 2400B is capable of running on external DC or battery power as
well as AC line power. Instruments so equipped can be identified by
the "B" at the end of the system model number, 2400, on the rear
panel serial number label.
It should be emphasized that external DC or battery operation is
simply an added convenience for some situations, and that batteries
are not required to achieve the low noise amplification specified for
the 2400 system.
An added toggle switch located on the rear panel selects either
external (EXT) or AC line operation (INT). Also, two additional
binding posts are added to the rear panel for external DC power
input. They are l15 and -15 volts. The ex15V supply
should be capable of supplying 120mA, and the -15V supply should
be capable of supplying 4OmA. For battery operation we recommend
either four Eveready type 717 batteries (7.5 volts each) or four
Eveready type 715 batteries. The 717's will provide about 10 hours
of use and the 715's will provide about 150 hours of use.
The power switch and its pilot light are not used during EXT
(external) operation. The audio MONITOR output to the speaker or
the monitoring oscilloscope will indicate that the 2400 is operating
on EXT. The rear panel toggle switch may be switched to the INT
position to disconnect the DC supplies or batteries.
D. SERVICING
Dagan Corporation prefers that we be allowed to perform any major
service work that should arise. The three year warranty period will
provide service at no charge to your during this period.
Listed below are some minor problems you may be able to correct
yourself and not void the warranty, if you should find self servicing
to be desirable or expedient.
MAIN FRAME COVER REMOVAL
