SECTION 2 OPERATION

TM 11-6625-3017-14

SECTION 2

OPERATION

2.1 INSTALLATION

the clip. A 6 BA screw, otherwise housed in a second

The Modulation Meter type TF 2300A is available in

hole to one side of the clip in the end plate is inserted

two versions: with a case for bench mounting, or with a

through the clip and tightened down for long journeys,

dust cover for rack mounting.

The latter version,

including delivery.

designated TF 2300AR, fits a standard 19 inch rack.

To reach the clip, release the four screws at the corners

Before inserting the TF 2300AR into a rack, slides or

of the oscillator front panel and slide the oscillator partly

runners should be fitted to the rack to support the

out. For short journeys, the carriage need not be locked

instrument and aid location.

if the instrument is placed upright on a layer of padding,

preferably with the tuning mechanism set to the high

Transit precautions

frequency limit of its travel.

To prevent damage being caused to the moving parts by

Remove the locking screw before attempting to use the

shocks or vibrations in transit, a clip as shown in Fig. 2-1

oscillator.

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,

2.2 POWER SUPPLY

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

The modulation meter may be used with a. c. mains or

with a hole in

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

Fig. 2-1. Oscillator transit locking arrangement

2-1