Agilent Technologies E361 A Series, Operating And Service Manual

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A-2
* P = Performance testing A = Calibration adjustments.
Constant Voltage(CV) Test
The measuring device must be connected as close to the output termi-
nals as possible when measuring the output impedance, transient
response, regulation, or ripple of the power supply in order to achieve
valid measurements. A measurement made across the load includes the
impedance several orders of magnitude greater than the supply output
impedance, thus invalidating the measurement.
Load Effect(Load Regulation)
Definition : CV Load Effect is the change in dc output voltage when
load resistance changes from open circuit to full load or from full load
to open circuit.
Test Parameters:
Measured Variable: Output Voltage
Expected Results: Less than 0.01% plus 2 mV
Test Procedure:
a. Connect the test equipment as shown in Figure A-2. Operate
the electronic load in constant current mode and set its current
to the full rated value of the power supply (E3610A: 3.0 A,
E3611A: 1.5 A, E3612A: 0.5 A).
b. Turn the unit's power on and turn CURRENT control fully clock-
wise.
c. Turn up output voltage to the full rated value (E3610A: 8.0 V,
E3611A: 20 V, E3612A: 60 V) as read on the digital voltmeter.
d. Record the output voltage at the digital voltmeter.
e. Operate the electronic load in Open(Input Off) mode.
f.
When the reading settles, record the output voltage again.
Check that the two recorded readings differ no more than
0.01% of output voltage plus 2 mV.
Figure A-2. Basic Test Setup
Source Effect(Line Regulation)
Definition: Source effect is the change in dc output voltage when the
ac input voltage changes from a minimum to maximum value ( ± 10%
of nominal voltage).
Test Parameter:
Measured Variable: Output Voltage
Expected Results: Less than 0.01% plus 2 mV
Test Procedure:
a. Connect the test equipment as shown in Figure A-2. Operate
the electronic load in constant current mode and set its current
Table A-1. Test Equipment Required
TYPE REQUIRED CHARACTERISTICS USE RECOMMENDED MODEL
Oscilloscope Sensitivity: 1 mV
Bandwidth: 20 MHz/100 MHz P Agilent 54602A
RMS Voltmeter True rms, 10 MHz bandwidth P
Multimeter Resolution: 0.1 mV
Accuracy: 0.01% P, A Agilent 34401A
Electronic Load Voltage Range : 240 Vdc
Current Renge : 10 Adc
Open and short switches
Transient on/off P, A Agilent 6063B
Load Resistor(For high current range) 2.6 ohm 50 W, 13.3 ohm 50 W, 120 ohm
50 W P
Current Sampling Resistor 0.1 ohm 0.1% 10 W, 1 ohm 1% 10 W P, A
When performance measurements are made at the front terminals, the
load should be plugged into the front of the terminals at (B), while the
monitoring device is connected to a small lead or bus wire inserted
through the hole in the neck of the binding posts at (A).
impedance of the leads to the load and such lead lengths can have an