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Test Equipment Required The following Table A-1 lists the equipment required to perform the tests and adjustments of this section. You can separately identify the equipment for performance tests, calibration, and troubleshooting in the USE column of the table. Operation Verification Tests The following tests assure that the power supply is performing properly. They do not, however, check all the specified parameters tested in the complete performance test described below. Proceed as follows: A-2 a. Perform turn-on checkout procedure given in page 1-7. b. Perform the CV and CC Load Regulation performance tests given in the following paragraphs respectively. PERFORMANCE TESTS The following paragraphs provide test procedures for verifying the power supply's compliance with the specifications of Table 1. Please refer to adjustment and calibration or troubleshooting procedure if you observe any out of specification performance. Measurement Techniques Setup for All Tests. Measure the output voltage directly at the +S and -S terminals on the rear panel; in this way the monitoring device sees the same performance as the feedback amplifier within the power supply. Failure to connect the monitoring device to the proper points shown in Figure A-3 will result in the measurement not of the power supply characteristics, but of the power supply plus the resistance of the leads between its output terminals and the point of connection. Use separate leads to all measuring devices to avoid the subtle mutual coupling effects that may occur between measuring devices unless all are returned to the low impedance terminals of the power supply. Twisted pairs or shielded cable should be used to avoid pickup on the measuring leads. Electronic Load. The test and calibration procedures use an electronic load to test the supply quickly and accurately. An electronic load is considerably easier to use than load resistor. It eliminates the need for connecting resistors or rheostats in parallel to handle the power, it is much more stable than carbon-pile load, and it makes easy work of switching between load conditions as is required for the load regulation and load transient response tests. Current Monitoring Resistor Rs. To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect the current monitoring (sampling) resistor between -OUT and the load as a four-terminal device. Figure A-3 shows correct connections. Connect the current monitoring test leads inside the load lead connections directly at the monitoring resistor element. Select a resistor with stable characteristics and lower temperature coefficient (see Table A-1). Figure A-3. Current Monitoring Resistor Connections Table A-1. Test Equipment Required TYPE REQUIRED CHARACTERISTICS USE RECOMMENDED MODEL Oscilloscope Sensitivity : 1 mV Bandwidth : 20 MHz/100 MHz Input : Differential, 50 ohm and 100 ohm P, T Agilent 54600A RMS Voltmeter True rms, 20 MHz bandwidth Sensitivity : 1 mV Accuracy : 5% P Multimeter Resolution : 100 nV Accuracy : 0.0035% P, A, T Agilent 34401A Electronic Load Voltage Range : 240 Vdc Current Range : 10 Adc Open and short switches Transient on/off P Agilent 6063A Load Resistor (RL) 1.3 ohm 60 W, 6.6 ohm 60 W, 20.5 ohm 60 W, 60 ohm 60 W P Current Monitoring (Sampling) Resistor (RS) 0.1 ohm 0.1% 10 W, 1 ohm 1% 5 W P, A Variable Voltage Auto Transformer Range : 85-130 and 200-260 Volts P, T * P = Performance testing A = Calibration adjustments T = Troubleshooting. A-3 CONSTANT VOLTAGE (CV) TESTS CV Setup. For all CV tests set the output current at full rated output to assure CV operation. The onset of constant current can cause a drop in output voltage, increased ripple, and other performance changes not properly ascribed to the conge, increased ripple, and other performance changes not properly ascribed to the constant voltage operation of the supply. Load Regulation (Load Effect) Definition: CV Load regulation is the change in the steady state value of dc output voltage due to a change in load resistance 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-4. Operate the electronic load in constant current mode and set its current to the full rated value of the power supply (6 A for E3614A, 3 A for E3615A, 1.7 A for E3616A and 1 A for E3617A). b. Turn the supply's power on and turn CURRENT control fully clockwise. c. Turn up output voltage to the full rated value (8 V for E3614A, 20 V for E3615A, 35 V for E3616A and 60 V for E3617A) 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 on the digital voltmeter again. Check that the two recorded readings differ less than 0.01% of output voltage plus ...

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