Tequipment Agilent E361 Serie Manual De Funcionamiento Y Servicio página 22

a. Connect the test equipment as shown in Figure A-7.
b. Turn the supply's power on and turn CURRENT con-
trol fully clockwise.
c. Turn up output voltage to the full rated value. Check
that the supply's CV indicator remains lighted.
Reduce VOLTAGE control if not lighted.
d. Set the oscilloscope to AC mode and bandwidth to 20
MHz.
e. Check that the peak-to-peak noise is less than 1 mV.
Figure A-7. CV PARD Peak-to-Peak Measurement Test
Setup
CV Drift (Stability)
Definition: The change in output voltage (dc to 20 Hz) for the
first 8 hours following a 30-minute warm-up period with con-
stant input line voltage, constant load resistance and constant
ambient temperature.
Test Parameter:
Measured Variable: Output Voltage
Expected Results: Less than 0.1% plus 5 mV
Test Procedure:
a. Connect the DVM across Rs in Figure A-4.
b. Operate the electronic load in constant current mode
and set its current to the full rated value of power sup-
ply.
c. Turn the supply's power on and turn CURRENT con-
trol fully clockwise.
d. Turn up output voltage to the full rated value as read
on the digital voltmeter.
e. After a 30-minute warm-up, note the voltage on DVM.
f. The output voltage reading should deviate less than
0.1% plus 5 mV from the reading obtained in step e
over a period of 8 hours.
CONSTANT CURRENT (CC) TESTS
CC Setup. Constant current tests are analogous to constant
voltage tests, with the supply's output short circuited and the
voltage set to full output to assure CC operation. For output
current measurements the current monitoring resistor must
be treated as a four terminal device. Refer to the "Measure-
ment Techniques" for details. All constant current measure-
ments are made in terms of the change in voltage across this
resistor; the current performance is calculated by dividing
these voltage changes by ohmic value of Rs.
Load Regulation (Load Effect)
Definition: CC Load regulation is the immediate change in the steady
state value of dc output current due to a change in load resistance from
short circuit to full load or from full load to short circuit.
Test Parameter:
Measured Variable: Output Current
Expected Results: Less than 0.01% plus 250 μA
Test Procedure:
a. Connect the DVM across Rs in Figure A-4. Operate the
electronic load in constant voltage mode and set its voltage
to the full rated value of power supply. Input off the elec-
tronic load.
b. Turn the supply's power on and turn VOLTAGE con-
trol fully clockwise and output current to the full rated
value. Then input on the electronic load.
c. Check that the AMPS display reads full rated values and
CC indicator remains lighted. Reduce CURRENT control if
not lighted.
d. Record the voltage across Rs and convert it to current by
dividing this voltage by Rs.
e. Operate the electronic load in short (input short) mode.
f. Record voltage across Rs again immediately and convert it
current. Check the difference of the reading taken during
the immediate change not more than 0.01% of output cur-
rent plus 250 μA.
Line Regulation (Source Effect)
Definition: Line regulation is the immediate change in the steady state
value of dc output current due to a change in ac input voltage from the
minimum to maximum value(±10% of nominal voltage).
Test Parameter:
Measured Variable: Output Current
Expected Results: Less than 0.01% plus 250 μA
Test Procedure:
a. Connect the DVM across Rs in Figure A-4. Operate the elec-
tronic load in constant voltage mode and set its voltage to the
full rated value of power supply. Input off the electronic load.
b. Connect the supply to the ac power line through a variable
autotransformer that set for low line voltage(104 Vac for nomi-
nal 115 Vac, 90 Vac for nominal 100 Vac, and 207 Vac for nom-
inal 230 Vac).
c. Turn the supply's power on and turn VOLTAGE control fully
clockwise and output current to the full rated value. The input
on the electronic load.
d. Check that the AMPS display reads full rated values and
CC indicator remains lighted. Reduce CURRENT control if
not lighted.
A-6