ST4073
Scientech Technologies Pvt. Ltd.
10
Functional Checks
The
30V- 2A Power Supply
should regularly be tested to assure proper functioning.
The following test checks out the power supplies performance and suggestions for
adjusting specific values. The adjustment will only be meaningful if the below
indicated or equivalent instruments are used. Prior to the functional test or adjustment,
the instrument should be on for at least 30 minutes.
Measuring Instruments required :
1.
4 ½ Digit DMM; 4011 Handheld or equivalent
2.
20 MHz Oscilloscope; Caddo 802 or equivalent
3.
Rheostat: 100
Ω
- 2A; 17
Ω
- 5.5A
Test Procedure :
0-30V DC output
1.
Check of maximum DC output voltage :
Set the Coarse and Fine knobs to
maximum, the maximum DC output reading should be between 31V and 33 V.
This also can be verified on DMM.
2.
Check of minimum DC output voltage :
Set the Coarse and Fine knobs to
minimum, the minimum DC output reading should be 00.0 Volts, which when
measured on DMM will be approximately 25mV for load resistor of < 5K
Ω
.
3.
Check of minimum current limit setting :
Set DC output to 10V & short circuit
the output terminals. Adjust current limit knob I max to minimum the reading on
the display should be < 100mA.
4.
Check of maximum. Output current :
Set the DC output voltage to 10V. Short-
circuit the output terminals. Adjust the I max current limit knob to maximum, the
reading on the display, should be between 2.02A and 2.2A.
5.
Check of over load Indicators :
Set the instrument as in 3. When the output
terminals are short circuited, CC LED should light up.
6.
Check of residual ripple and noise :
Connect any load on DC output and adjust
the I max, to maximum (maximum to 2000mA), and check the ripple and noise on
oscilloscope, the ripple and noise should not be more than 1mVrms.
