Table of Contents
Advertisement
SECTION V
MAINTENANCE
5-1
INTRODUCTION
5-2
Upon receipt of the power supply, the performance
test (paragraph 5-5) should be made. This test is suitable
for incoming inspection. If a fault is detected in the power
supply while making the performance test or during normal
operation, proceed to the troubleshooting procedures
(paragraph 5-49). After troubleshooting and repair
(paragraph 5-69) perform any necessary adjustments and
calibrations (paragraph 5-71). Before returning the power
supply to normal operation, repeat the applicable portions
of the performance test to ensure that the fault has been
properly corrected and that no other faults exist. Before
performing any maintenance checks, turn on the power
supply and allow a half-hour warm-up.
Table 5-1. Test Equipment Required
TYPE
REQUIRED
CHARACTERISTICS
USE
RECOMMENDED
MODEL
Digital
Voltmeter
Sensitivity: lOOpV full scale (min.)
Input Impedance: 10MS7 (min.)
Measure dc voltages;
calibration procedures.
HP 3450B
Oscilloscope
Sensitivity and bandwidth:
lOOpV/cm and 400kHz for all
measurements except noise
spike; 5mV sensitivity and
20MHz bandwidth for noise
spike measurement.
Measure ripple; display
transient recovery
waveform; measure
noise spikes.
HP 180C with 1821A
time base and 1806A
vertical plug-in;
1803A plug-in for
spike measurement.
Variable
Voltage
Transformer
Range: 208-254 volts. Output
current: 200% (min.) of supply
input current listed in para. 2-16.
Vary ac input for line
regulation measurement.
—
Digital or Analog
Multimeter
Measure ac and dc
voltages, resistance.
HP 3490A
or HP427A
Repetitive
Load Switch
Switching rate: 60-400Hz.
Rise time: 2psec.
Measure transient
recovery time.
See Figure 5-4.
Resistive
Load
Values: see Figures 5-1, 5-4, and
5-7.
Power supply load
resistor.
—
Current
Sampling
Resistor
Value: See Figure 5-7.
Measure output current;
calibrate ammeter.
—
Terminating
Resistors
Value: 50 ohms, 1/2 watt, ±5%
non-inductive. (Four required.)
Noise spike
measurement.
—
Blocking
Capacitors
Value: O.OlpF, 10OVdc. (Two
required.)
Noise spike
measurement.
—
5-1
Advertisement
Table of Contents
