TM 11-6625-2965-14&P

 

 

 

Table 5-1. Test Equipment Required (Continued)

 

 

 

 

 

 

 

 

 

 

TYPE

 

REQUIRED

 

 

USE

R E C O M M E N D E D

 

CHARACTERISTICS

 

MODEL

 

 

 

 

 

 

 

 

 

 

 

Resistor

6204B, 6205B; 133

, ± 10% 15W

Load Resistor, HIGH range

- - - -

 

 

6206B; 120 , ±1O% 15W

 

 

 

 

Resistor

Value:

5

, 0.5%,

4.5 Watts,

Current

sampling

R54 or R55,

 

 

20ppm,

4-Terminal.

 

 

 

Section VI

 

Resistor

Value: 6204B and 6205B, 28 ,

Load resistor, low range

- - - -

 

 

2W (min.).

 

 

 

 

 

 

 

6206B, 27 , 10W (min.).

 

 

 

 

Resister

1Κ ± 1%, 2 Watt non - induc -

Measure

impedance

- - - -

 

 

tive

 

 

 

 

 

 

 

Resistor

100 ohms, ±5%, 10 Watt

Measure

impedance

- - - -

 

Resistor

Value:

See

Paragraph 5-67.

Calibrate

programming current

- - - -

 

 

± 0.1%,

5

Watt

 

 

 

 

 

Capacitor

500µf,

50WVdc

 

Measure

impedance

- - - -

 

Decade

Range: 0-150K (min.).

Measure

programming

- - - -

 

Resistance

Accuracy: 0.1% plus 1 ohm

coefficients

 

 

Box

Make-before-break

contacts.

 

 

 

 

 

 

 

 

 

 

 

 

5-10 PERFORMANCE TEST

5-11 The following test can be used as an incoming inspection check and appropriate portions of the test can be repeated either to check the operation of the instrument after repairs or for periodic

maintenance

tests. The tests are performed using

a

115Vac 60

Hz, single phase input

power

source.

If

the correct

result is not obtained

for a

particu-

lar check, do not adjust any controls; proceed to troubleshooting (Paragraph 5-48).

NOTE

For Model 6205B supplies, the following performance checks should be performed twice in order to check both independent sections of the supply.

5-12 CONSTANT VOLTAGE TESTS

5-13 For Constant Voltage measurements, the measuring device must be connected acress the rear sensing terminals of the supply in order to achieve valid indications. A measurement made acress the load includes the impedance of the

leads to the load and such lead lengths can easily have an impedance several orders of magnitude greater than the supply impedance (1 milliohm at dc), thus invalidating the measurement.

5-14 To avoid mutual coupling effects, each monitoring device must be-connected directly to the sensing terminals by separate pairs of leads. The load resistor is connected acress the output terminals and must be selected according to the output voltage and current of the supply. When measuring the constant voltage performance spec- ifications, the CURRENT controls should be set well above the maximum output current which the supply will draw, since the onset of constant current action will cause a drop in output voltage, increased ripple, and other performance changes not properly ascribed to the constant voltage operation of the supply.

5-15 Voltage Output and Voltmeter Accuracy. To check the output voltage, proceed as follows:

a. Connect 133 ohm load resistor (120 ohms for Model 6206B) across rear output terminals of supply.

b. Connect differential voltmeter acress +S and -S terminals of supply observing correct polar- ity.

5-3