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DUAL OUTPUT POWER SUPPLY
Agilent MODEL E3630A
OPERATING AND SERVICE MANUAL
FOR INSTRUMENTS WITH SERIAL NUMBERS
KR85014528 AND ABOVE
For instruments with Serial Numbers above
KR85014528, a change page may be included.
Manual Part No. 5959-5329
April 2000
Edition 7
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SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer's failure to comply with these requirements. SAFETY SYMBOLS BEFORE APPLYING POWER. Verify that the product is set t
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Table of Contents SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . .
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between your instrument and the instrument described by this GENERAL INFORMATION manual. The Change Sheet may also contain information for correcting errors in the manual. INTRODUCTION This section contains general information concerning the OPTIONS E3630A triple output power supply. Included are safety con- Options OE3 and OE9 determine which line voltage is siderations, safety and EMC requirements, instrument and selected at the factory. The standard unit is configured for 115 manual identific
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mode. In this mode the voltage of the negative output can be set are available for nominal inputs of 100 and 230 Vac. The sup- lower than that of the positive output. The tracking ratio control ply is furnished with a detachable 3-wire grounding type line allows the negative supply's output to be set to any value cord. The ac line fuse is in an extractor type fuseholder on the between a maximum that is within ±5% of the positive supply's rear heat sink. output and a minimum that is less than 0.5
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cord plug appropriate for the user's location. Notify the near- INSTALLATION est Agilent Sales and Service Office if the appropriate power cord is not included with the supply. INITIAL INSPECTION Before shipment, this instrument was inspected and found to be free of mechanical and electrical defects. As soon as the instrument is unpacked, inspect for any damage that may have occurred in transit. Save all packing materials until the inspection is completed. If damage is found, a claim should be f
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tor the 0 to 40V output voltage, add the voltmeter readings of the +20V and -20V output and use either the +20V or the - 20V meter to measure the current. Before applying power to the supply, check the label on the Tracking Ratio Control heat sink to make certain that the supply's line voltage option With the Tracking Ratio control in the Fixed position, the volt- agrees with the line voltage to be used. If the option does not age of the -20V supply tracks that of the +20V supply within correspo
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necessary to fulfill the total current demand. Series Operation Series operation of two or more power supplies can be accomplished up to the output isolation rating of any one sup- ply to obtain a higher voltage than that available from a single supply. Series connected supplies can be operated with one load across both supplies or with a separate load for each supply. The power supply has a reverse polarity diode con- nected across the output terminals so that if operated in series with othe
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Figure 4. Reverse Current Loading Solution 1-9
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SERVICE INFORMATION Figure A-1. Block Diagram By comparing its output to a high-stability reference, the 0 to PRINCIPLES OF OPERATION +6-volt regulator holds its output voltage at the value deter- (Block Diagram Overview) mined by a front panel control. Any error in the actual output as compared to the desired output is amplified by an opera- This section presents the principles of operation of the tional amplifier and applied as feedback to control the con- E3630A Triple Output Power Supply. T
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put is enclosed by a heavy line in Figure 3 of the operating The reference and bias supply powers the operation amplifi- section. If the operating point reaches the diagonal current ers and provides reference and bias voltages for the output limit line, a decrease in load resistance moves the operating regulators. The display power circuit provides voltage which point down the line, reducing the output voltage and current. is used by the A/D converter and display. Current foldback is controlled
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Table A-1. Test Equipment Required (Cont’d) Current Sampling 100 mΩ 0.1% 15 W Measure output current Resistor (Shunt) Variable Voltage Range : 85-130 and 200-260 Vary ac input. Auto Transformer Volts Operation Verification Tests General Measurement Techniques The following tests assure that the power supply is per- forming properly. They do not, however, check all the speci- Connecting Measuring Devices. To achieve valid results fied parameters tested in the complete performance test when measu
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Output Current Measurement. For accurate output current Variable Tracking Ratio measurements, a current sampling resistor should be inserted e. Leave the ±20V VOLTAGE control set as in step (d), and between the load and the output of the supply. To simplify use a DVM to monitor the voltage of the -20V supply grounding problems, one end of this sampling resistor should be while adjusting the TRACKING RATIO control over its connected to the same output terminal of the supply which will VARIABLE
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Current Limit Line Regulation (Source Effect) k. Disconnect all loads from the supply. Definition: The change, E , in the static value of dc output OUT l. Connect the test setup shown in Figure A-5 to the +20- voltage resulting from a change in ac input voltage from a volt output. Substitute a short for R and leave the load minimum to a maximum value (±10% of nominal voltage). L circuit switch open. To check the line regulation: m. Set the voltage of the ±20V supplies to 20 volts. a. Connect
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Peak-to-Peak Measurement d. Turn on the supply. The peak-to-peak measurement is particularly important for e. Record the voltage across R and convert it to current by S applications where noise spikes could be detrimental to a dividing this voltage by R . S sensitive load, such as logic circuitry. f. Check that the current is less than 1 A. To measure the ripple and noise of the peak-to-peak value on Load Transient Response Time each output supply output: Definition : This is the time for the
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Stability (Drift) 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 Before applying power to the supply, make certain ambient temperature. that its line voltage selector switch (S2) is set for the line voltage to be used. To measure the stability: a. Connect the test equipment across the output of the Initial Troubleshooting Procedure +20V supply as shown in F
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Table A-3. Initial Trobleshooting Procedure STEP ACTION RESPONSE NEXT ACTION 1 Check output voltage of +20V a. Normal a. Proceed to step (2). supply. b. Zero volts b. Check ac line fuse (F1). If blown, proceed to "Open Fuse Troubleshooting" paragraph. If not blown, check bias and reference voltages (Table A-4). c. Output voltage lower or c. Check bias and reference voltages (Table A-4). higher than rating 2 Check output voltage of -20V a. Normal a. If +20V and -20V outputs are both normal with
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Table A-5. +20V Supply Troubleshooting (Cont’d) Low output voltage 1. Measure voltage at the a. Measured voltage is less than 0 a. Check for open Q9, Q6, R26, or (lower than rating) base of Q5. volt. CR5. b. Measures voltage is more than 0 b. Proceed to step (2). volt. 2. Eliminate current limit a. Output voltage increases. a. Check for U6B defective. circuit as a source of b. Output voltage remains low. b. Reconnect lead and proceed to trouble by disconnecting step (3). anode of CR11. 3.
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Table A-7. +6V Supply Troubleshooting SYMPTOM STEP - ACTION RESPONSE PROBABLE CAUSE The +20V supply must operate properly before troubleshooting the -20V supply. High output voltage 1. Attempt to turn off Q1 by a. Output voltage remains high. a. Q1 shorted. (higher than rating) shorting emitter-to-base b. Output voltage becomes near zero b. Remove short and proceed to of Q1. volt. step 2. 2. Measure voltage at a. Measured voltage is more than a. Check for defective Q4. base of Q4. -0.6V. b. Mea
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c. Set the output voltage below 18V (ex, 15V), and adjust ADJUSTMENT AND CALIBRATION R11 on the display board until front panel VOLTS display reads exactly DVM value. Next, set the output voltage Current Limit Adjustment above 20V (ex, 21V) and adjust R17 on the display board until front panel VOLTS display reads exactly DVM value. +6V Supply. To adjust the current limit circuit in the +6V sup- ply, proceed as follows: a. Check the setting of the current limit by performing steps (p) and (
