TM 11-6625-2965-14&P
Table 5-1.
Test Equipment Required (Continued)
TYPE
REQUIRED
USE
RECOMMENDED
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
leads to the load and such lead lengths can easily
have an impedance several orders of magnitude
5-11 The following test can be used as an incom-
greater than the supply impedance (1 milliohm at
ing inspection check and appropriate portions of
dc), thus invalidating the measurement.
the test can be repeated either to check the oper-
ation of the instrument after repairs or for periodic
5-14 To avoid mutual coupling effects, each
maintenance tests. The tests are performed using
monitoring device must be-connected directly to
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 follow-
ing 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
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 cur-
rent action will cause a drop in output voltage,
increased ripple, and other performance changes
not properly ascribed to the constant voltage op-
eration 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
