Instruction manual

TM 11-6625-3017-14
SECTION 2
OPERATION
2.1 INSTALLATION
The Modulation Meter type TF 2300A is available in
two versions: with a case for bench mounting, or with a
dust cover for rack mounting. The latter version,
designated TF 2300AR, fits a standard 19 inch rack.
Before inserting the TF 2300AR into a rack, slides or
runners should be fitted to the rack to support the
instrument and aid location.
Transit precautions
To prevent damage being caused to the moving parts by
shocks or vibrations in transit, a clip as shown in Fig. 2-1
is fitted. The tuning mechanism consists of a carriage
running on a worm screw turned by the control knob; the
carriage is mechanically coupled to ferrite tuning slugs in
the variable inductors. The transit clip locks the carriage,
and this must be released before the oscillator can be
used. At the high frequency end of carriage travel, a
tapped hole in the top of the brass carriage comes in line
with a hole in
Fig. 2-1. Oscillator transit locking arrangement
the clip. A 6 BA screw, otherwise housed in a second
hole to one side of the clip in the end plate is inserted
through the clip and tightened down for long journeys,
including delivery.
To reach the clip, release the four screws at the corners
of the oscillator front panel and slide the oscillator partly
out. For short journeys, the carriage need not be locked
if the instrument is placed upright on a layer of padding,
preferably with the tuning mechanism set to the high
frequency limit of its travel.
Remove the locking screw before attempting to use the
oscillator.
2.2 POWER SUPPLY
The modulation meter may be used with a. c. mains or
batteries.
2.2.1 Mains supply, 110-230 V
The socket of the lead provided with this instrument
fits into the plug on the rear panel. The other end of the
lead must be fitted with a plug by the user. The three
conductors are provided with identification sleeves for
this purpose, as follows:
Color Connection Sleeve Symbol
Brown Line
Blue Neutral Black WhiteN
Yellow/GreenEarth Yellow (Green)
Before plugging in to the mains supply, check that
the fuse rating and mains voltage setting are correct.
For voltages around 230 V, a 100 mA fuse is fitted; for
110 V, this must be changed to 160 mA. Check that the
h. t. fuse is 500 mA and note that it is a quick-blow type.
To change the mains voltage switch setting, remove the
L-shaped
2-1