Agilent Technologies E3610A Manual Del Usuario página 60

Figure A-4. RMS Measurement Test Setup
PARD(Peak-to-Peak) Measurement
Test Parameter:
Measured Variable: Output voltage(peak-to-peak)
Expected Results: Less than 2 mV p-p
Test Procedure:
a. Connect the test equipment as shown in Figure A-5.
b. Turn the unit's power on and turn CURRENT control fully clock-
wise.
c. Turn up output voltage to the full rated value. Check that the
unit'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 no more than 2 mV.
Figure A-5. Peak-to-Peak Measurement Test Setup
Constant Current(CC) Tests
For output current measurements the current sampling resistor must
be treated as a four terminal device. In the manner of a meter shunt,
the load current is fed to the extremes of the wire leading to the resis-
tor while the sampling terminals are located as close as possible to
the resistance portion itself. Generally, any current sampling resistor
should be of the low noise, low temperature coefficient type end
should be used at no more than 5% of its rated power so that its tem-
perature rise will be minimized.
Load Effect(Load Regulation)
Definition: CC Load Effect is the immediate change in dc output cur-
rent when load resistance changes 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 1 mA
Test Procedure:
a. Connect the DVM across R
tronic load in constant voltage mode and set its voltage to the
full rated value of power supply. Input off the electronic load.
b. Turn the unit's power on and turn VOLTAGE control fully clock
wise and current control 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 through
dividing by R .
s
e. Operate the electronic load in short(input short mode).
f. Record voltage across R
ference during the immediate change should not more than
0.01% of output current plus 1 mA.
Source Effect(Line Regulation)
Definition: Source Effect is the immediate change in dc output cur-
rent when the ac input voltage changes from the minimum to maximum
val ue(± 10% of nominal voltage).
Test Parameter:
Measured Variable: Output Current
Expected Results: Less than 0.01% plus 1 mA
Test Procedure:
a. Connect the DVM across R
in constant voltage mode and set its voltage to the full rated value of
power supply.
b. Connect the unit to the ac power line through a variable autotransformer that
set for low line voltage(104 Vac for 115 Vec). Input off the electronic load.
c. Turn the unit's power on and turn VOLTAGE control fully clock wise and out-
put current to the full rated value. Then 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.
e. Record output voltage across Rs and convert it to current through dividing
by R .
s
f. Adjust autotransformer to the high line voltage(127 Vac for 115 Vac).
g. Record the voltage across R
during the immediate change should not more than 0.01% of output cur-
rent plus 1 mA.
PARD(Ripple and Noise)
Definition: Periodic and random deviation(PARD) in the unit's output
ripple and noise combine to produce a residual ac current as well as
A-4
in Figure A-2. Operate the elec-
s
again immediately. The readings' dif-
s
in Figure A-2. Operate the electronic load
s
again immediately. The readings' difference
s