Section I l . DESCRIPTION AND LEADING PARTICULARS

TM 55-4920-325-14&P

Section I l . DESCRIPTION AND LEADING PARTICULARS

nating current (at) rebalancing bridge type, ca-

1-3. Description.

p a c i t a n c e substitution circuitry, calibration

The Model TF579 test set is manufactured by

circuitry with built-in standards of capacitance

Consolidated Airborne Systems, Inc., Carla Place,

and resistance, cable assemblies, and accessories.

L.I., New York. The test set provides a means to

determine the serviceability of aircraft (fixed and

1-4. Leading Particulars.

rotary wing) employing a capacitance type fuel

gaging system. The" test set consists of a single

Leading particulars, consisting of the technical

integral unit incorporating a transit case, direct

characteristics of the test set, are contained in ta-

current (dc) electrical resistance measuring cir-

ble 1-1. Cables and accessories supplied with the

cuit, capacitance measuring circuitry of an alter-

test set are listed in table 1-2.

Table 1-1. Leading Particulars.

Item

Characteristics

Power Requirements

105 to 125 Volts.

Voltage

200 to 236 Milliamperes.

Current

25 Watts.

Wattage

Frequency

360 to 440 Hz.

Phase

Single Phase.

Range of Operation

Capacitance Measurement

Range

0 to 5000 uuf in four ranges.

Accuracy

0 to 1/2 scale = 0.25% of full scale.

1/2 to full scale = 0.5% of reading.

Maximum short circuit current

Less than 0.2 ampere.

X1, X3, X10, and X50.

Scale multipliers

Subdial, producing direct vernier readings to within

Vernier indicator scale

0.1%.

Precise tolerance capacitor, of known value, is in-

Self-calibrating feature

cluded within test set.

Insulation Resistance Measurement

0 to 10,000 megohms in four ranges.

Range

1/16 in. of scale reading.

Accuracy

Selector switch provides means for testing resistance

Measurement capabilities

between the following:

Unshielded conductor and compensator conductor to

ground.

Coaxial conductor to ground.

Coaxial conductor to unshielded conductor.

Coaxial conductor to compensator conductor.

33 microamperes at normal 33-volt operation.

Maximum short circuit current

X1, X10, X100, end X1000.

Scale multipliers

For checking insulation resistance of system wiring or

External resistance terminals

other equipment, using separate test leads.

1-2