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NF BA4825 Instruction Manual

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HIGH SPEED BIPOLAR AMPLIFIER
BA4825
Instruction Manual
NF Corporation

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Summary of Contents for NF BA4825

  • Page 1 HIGH SPEED BIPOLAR AMPLIFIER BA4825 Instruction Manual NF Corporation...
  • Page 3 DA00015282-004 HIGH SPEED BIPOLAR AMPLIFIER BA4825 Instruction Manual...

  • Page 5: Overview

    Describes the overview, features, applications, functions, and brief operation principles. 2. PREPARATIONS BEFORE USE Describes various cautions regarding preparations to be made before using the BA4825. 3. PANEL FEATURES AND BASIC OPERATIONS Describes features, behavior, and basic operation of panel knobs. Read this chapter while operating the device.
  • Page 6  Safety Precautions  To ensure safe use, be sure to observe the following warnings and cautions. NF Corporation shall not be held liable for damages that arise from a failure to observe these warnings and cautions. This product is a Class 1 product (with protective conductor terminal) that conforms to the JIS and IEC insulation standards.
  • Page 7  Do not expose this product to water. When this product is used in wet condition, it may cause an electric shock and a fire. If this product is exposed to water, unplug the power cord immediately, and contact NF Corporation or one of our representatives.
  • Page 8  Notes for Disposal When disposing of this product, ask a company that handles industrial waste, to ensure environmental protection. BA4825...

  • Page 9: Table Of Contents

    5.2 When Fault Symptoms Are Observed ..............5-5 MAINTENANCE ......................6-1 6.1 Introduction ......................6-2 6.2 Daily Maintenance ....................6-3 6.3 Storage, Repacking, and Transportation .............. 6-4 6.4 Performance Testing ....................6-5 6.4.1 Measurement of maximum output voltage ............6-6 BA4825...
  • Page 10 7.6 Output On/Off Control .................... 7-9 7.7 Setting at Power-on ....................7-10 7.8 Power Input ......................7-10 7.9 Safety and EMC ....................7-10 7.10 Ambient Temperature Range, Ambient Humidity Range, Etc......7-11 7.11 External Dimensions and Weight..............7-12 BA4825...
  • Page 11 Figure 4-3. Operation Range (250 V to +50 V range) ............... 4-3 Figure 4-4. Current Waveform Asymmetric with Regard to Polarity ..........4-4 Figure 4-5. Connection of Two BA4825 Units ..................4-5 Figure 6-1. Air Filter Cleaning Procedure ..................6-3 Figure 6-2.
  • Page 12 Table 5-2. Errors Related to Protection Function (1/2)..............5-3 Table 5-3. Errors Related to Protection Function (2/2)..............5-4 Table 5-4. When Fault Symptoms Are Observed (1/2) ............... 5-5 Table 5-5. When Fault Symptoms Are Observed (2/2) ............... 5-6 Table 6-1. Judgment of BA4825 Performance ................. 6-13 viii BA4825...
  • Page 13 1. OVERVIEW General ............. 1-2 Features ............1-3 Applications ............1-4 List of Functions ..........1-4 Principle of Operation ........1-5 BA4825...

  • Page 14: General

    The BA4825, however, can supply both positive and negative (source and sink) current. The BA4825 can be used with DC, so that an offset waveform or a waveform asymmetric with regard to polarity can also be amplified.

  • Page 15: Features

     Output voltage range switching function The BA4825 provides three output voltage ranges: 250 V to +50 V, 150 V to +150 V, and 50 V to +250 V. A desirable range can be selected for an application.

  • Page 16: Applications

     For testing and characteristics analysis of FEDs, liquid crystals, and so forth  For testing and characteristics analysis of micro actuators and so forth  For use as a booster amplifier for signal generators such as the WF series of NF Corporation ...

  • Page 17: Principle Of Operation

    The power amplifier block performs power amplification and has protection functions. The power supply block consists of the internal power supply block of the BA4825, and the DC power supply block for the power amplifier with a function for shifting voltage in phase with the output range.

  • Page 19: Preparations Before Use

    2. PREPARATIONS BEFORE USE Checking Before Use ........2-2 Setup and Installation ........2-3 Grounding and Power Supply Connection ..2-5 Simplified Operation Check....... 2-6 Calibration ............2-9 Radio Law............2-10 BA4825...

  • Page 20: Checking Before Use

    After opening the corrugated box, check the items contained in the box. If an abnormality such as a flaw or dent is found on the product, or an accessory is missing, contact NF Corporation or its representative.  Appearance check Check that no abnormalities such as a flaw and dent are found on the panel, controls, connectors, and so forth.

  • Page 21: Setup And Installation

    Ensure that all of the four rubber legs at the bottom are placed on a plane surface such as a desk. If the BA4825 is placed with its rear facing down, the BA4825 can fall, resulting in a product failure or physical harm.
  • Page 22  Use the BA4825 indoors at an altitude of no higher than 2000 m.  The BA4825 performs forced air cooling using fans. Separate the front, rear, and sides with air inlets and air outlets from the wall by 50 cm or more to assure ventilation.

  • Page 23: Grounding And Power Supply Connection

    This product uses a line filter. Be sure to ground this product. Otherwise, an electric shock may occur. To prevent an electric shock from occurring, be sure to ground the BA4825 according to "Electric Equipment Technical Standard Class D (100 or below) Grounding" or higher.

  • Page 24: Simplified Operation Check

    Note that the dielectric strength of only the main unit of this product is 1500 VAC. 2.4 Simplified Operation Check This section describes the simplified operation check method, which may be used when the BA4825 is newly purchased or after being stored for a long time. For performance checking, refer to "6.4 Performance Testing".

  • Page 25: Figure 2-1. Standard Connection Diagram

    1 CH 30 MHz Oscilloscope Signal generator Voltmeter 10:1 probe Figure 2-1. Standard Connection Diagram  Panel setting Set the BA4825 and signal generator as indicated below. Table 2-2. Panel Setting for Operation Check BA4825 Item Setting INPUT Set A to ON.
  • Page 26 1 Vrms 7. Set the level of the signal generator to 0 V, set the bias of the BA4825 to ON, and set the voltmeter for DC measurement. Next, by tuning the bias dial, check the output meter indication and output voltage.

  • Page 27: Calibration

    It is recommended to conduct a performance test before using it for an important measurement or test. A performance test should be conducted by a person who has a general knowledge of measuring instruments and is familiar with measuring instrument handling. BA4825...

  • Page 28: Radio Law

    CAUTION The high-frequency application equipment provisions of Japan's Radio Law may be applicable to the BA4825, depending on the conditions of use. a) Related laws and regulations are summarized as follows: Article 100 of the Radio Law defines the following equipment as "high-frequency application ...
  • Page 29 Applications must be submitted by the person who installed the equipment, since information such as the installation location must be filled in. e) The BA4825's external view drawings or photographs are required as attached documents. For any question or further information, contact an NF Corporation sales representative.

  • Page 31: Panel Features And Basic Operations

    Voltage range selection ······································· 3-10 3.5.3 Output voltage adjustment··································· 3-11 3.5.4 Fine output offset adjustment ······························ 3-11 3.5.5 DC bias addition·················································· 3-12 3.5.6 Output polarity switching ····································· 3-12 3.5.7 Output voltage monitoring ··································· 3-13 3.5.8 Output on/off control············································ 3-14 Setting at Power-on···················································· 3-14 BA4825...

  • Page 32: Panel Component Designations And Operations

    Output on/off switch 3.5.8 Meter polarity LED 3.5.7 3.5.8 Overload LED Output connector 3.3.2 Bias key and dial 3.5.5 Meter switch key 3.5.7 Output polarity switch key 3.5.6 Voltage range selection keys 3.5.7 Input connector 3.3.1 Figure 3-1. BA4825 Front Panel BA4825...

  • Page 33: Rear Panel

    3.1 Panel Component Designations and Operations 3.1.2 Rear panel Input connector 3.3.1 Monitor output connector 3.3.3, 3.5.7 Power inlet External control I/O connector 3.3.4 DIP switch set at power-on Figure 3-2. BA4825 Rear Panel BA4825...

  • Page 34: Indications At Power-On And Initialization

    For the initial setting of the DIP switch, refer to "3.6 Setting at Power-on". If the BA4825 cannot be operated after the power is turned on, a fault has occurred. Turn off the power immediately and then contact NF Corporation or its representative.

  • Page 35: Main Output

    WARNING ！ The maximum output voltage of the BA4825 is 250 V. An electric shock can occur if the output connector is directly touched. For safe use, be sure to observe the following:  Turn off the power when making connections.

  • Page 36: Monitor Output

    3.3 I/O Terminals 3.3.3 Monitor output The BA4825 has a monitor output connector for observing an output voltage. An output waveform can be observed by connecting an oscilloscope directly to the connector. The monitor output connector outputs a voltage, regardless of the output on/off setting. A voltage as small as 1/100 of the main output level is output.

  • Page 37: Figure 3-3. External Control I/O

    3.3 I/O Terminals BA4825 +5 V Diode voltage drop ダイオードの電圧降下 about 1 V 約1 V 150  External output on/off 外部出力オン／オフ (output on when external contact is on) （外部接点オン時，出力オン） 100  15 V or lower, 10 mA or lower 15 V以下，10 mA以下...

  • Page 38: I/O Connection

    3.4 I/O Connection 3.4 I/O Connection Figure 3-4 Basic Connection Diagram shows the connection diagram. For full performance of the BA4825, connect a signal generator, signal cords, and a load, observing the descriptions provided in "3.4.1 Signal generator" through "3.4.3 Load". WF1947...

  • Page 39: Signal Cords

    When a high frequency is used, maximum power may not be supplied to a load because the output voltage of the BA4825 is partly consumed due to the inductance of the wire. If a capacitive load is used, LC resonance can occur with the wire inductance, resulting in ringing. Run a wire along a route as short as possible.

  • Page 40: Examples Of Basic Operations

    50  or 10 k with the input impedance switch key (Zin key). ！ CAUTION The BA4825 may be damaged if a voltage beyond the non-destructive maximum input voltage (11 V) is applied. Never apply a voltage beyond 11 V.

  • Page 41: Output Voltage Adjustment

    If trouble occurs because a direct current component is superimposed on the signal due to inductance, make a fine adjustment to set the offset voltage included in the output signal of the BA4825 to zero. Use the following procedure for fine offset voltage adjustment: 1.

  • Page 42: Dc Bias Addition

    3.5.5 DC bias addition The BA4825 can add a DC voltage onto an output voltage signal for output. For this setting, set the bias key (BIAS key) to ON and use the bias dial. A bias voltage beyond ±200 V but not exceeding the maximum output value of a selected output range can be set.

  • Page 43: Output Voltage Monitoring

    For a frequency of 100 kHz or higher, the meter indicator can deflect due to a leakage to the internal circuitry. Greater leakage to the internal circuitry occurs as the frequency rises and the output voltage strengthens. 3-13 BA4825...

  • Page 44: Output On/Off Control

    (OUTPUT) can only be set to OFF. The LED in the output on/off switch (OUTPUT) turns on when output is turned on. The LED blinks when output is turned off by the protection function of the BA4825. For protection cancellation, press the output on/off switch (OUTPUT).

  • Page 45: Table 3-2. List Of Dip Switch Settings

    DC bias off Meter indication setting DOWN Current (I) 3.5.7 Output voltage monitoring Voltage (V) Output range setting Output range 150 V range 3.5.2 Voltage range selection 11, 12 DOWN DOWN DOWN +250 V range 250 V range DOWN 3-15 BA4825...

  • Page 47: Advanced Operations

    4. ADVANCED OPERATIONS Maximum Output Current and Operation Range..4-2 Increasing of Output ..........4-5 BA4825...

  • Page 48: Maximum Output Current And Operation Range

    4.1 Maximum Output Current and Operation Range The BA4825 has a protection circuit that detects an output current and internal loss to limit the output current. A maximum output current is determined by this protection circuit. This limitation value varies, depending on the output time and output voltage.

  • Page 49: Figure 4-2. Operation Range (150 V Range)

    Figure 4-2. Operation Range (150 V range) Output voltage 出力電圧  −1.0 Output current 出力電流 DC value and 直流値及び average AC value 交流平均値  −100 交流ピーク値 AC peak value  −200 Figure 4-3. Operation Range (250 V to +50 V range) BA4825...

  • Page 50: Figure 4-4. Current Waveform Asymmetric With Regard To Polarity

    (Ipk) on the negative side. The average values (+Iave, Iave) and peak values (+Ipk, Ipk) are limited by the DC operation limitation range and AC peak operation limitation range, respectively. +Ipk +Iave −Ipk −Iave Figure 4-4. Current Waveform Asymmetric with Regard to Polarity BA4825...

  • Page 51: Increasing Of Output

    Set the output polarity switch key (INVT key) on one BA4825 unit to INVT so that the output phase is opposite to that of the other BA4825 unit. Set the input impedance to 10 k on both BA4825 units. Set the same gain on both BA4825 units.

  • Page 53: Troubleshooting

    5. TROUBLESHOOTING Error Messages ............5-2 5.1.1 Errors at Power-on ..........5-2 5.1.2 Errors related to the protection function ..... 5-3 When Fault Symptoms Are Observed ....... 5-5 BA4825...

  • Page 54: Error Messages

    Errors and their causes are described below, together with required actions. 5.1.1 Errors at Power-on The BA4825 performs self-diagnosis when the power is turned on. If an abnormality is found, contact NF Corporation or its representative. Table 5-1. Diagnosis Performed at Power-on...

  • Page 55: Errors Related To The Protection Function

    5.1 Error Messages 5.1.2 Errors related to the protection function The errors related to the protection function are shown below. Contact NF Corporation or its representative if an abnormality is found. Table 5-2. Errors Related to Protection Function (1/2) State...

  • Page 56: Table 5-3. Errors Related To Protection Function (2/2)

    LED (OVLD) blinks if the abnormal output voltage state lasts for 60 seconds. The BA4825 cannot be operated in sleep operation, so turn off the power. If the overload LED (OVLD) is on even when the input signal, bias, and output are off, the BA4825 may have failed.

  • Page 57: When Fault Symptoms Are Observed

    5.2 When Fault Symptoms Are Observed 5.2 When Fault Symptoms Are Observed When a fault symptom shown below is observed, perform the corresponding action required. Contact NF Corporation or its representative if the symptom cannot be corrected. Table 5-4. When Fault Symptoms Are Observed (1/2)

  • Page 58: Table 5-5. When Fault Symptoms Are Observed (2/2)

    Set a proper gain by using a gain switch key (GAIN An incorrect gain setting is made. key). When using the BA4825, ensure that the ambient The ambient temperature is high. overload temperature is 40C or below.

  • Page 59: Maintenance

    6.4.1 Measurement of maximum output voltage ..6-6 6.4.2 Measurement of maximum output power.... 6-7 6.4.3 Measurement of frequency characteristics ..6-8 6.4.4 Measurement of gain error ....... 6-10 6.4.5 Measurement of sine wave distortion factor ..6-11 6.4.6 Measurement of bias-added voltage ....6-12 BA4825...

  • Page 60: Introduction

     Performance test required, for example, for preventive maintenance, acceptance testing, and performance confirmation after repair See section "2.4 Simplified Operation Check" for simplified operation checking. Contact NF Corporation for calibration or repair if an operation check or performance test cannot be made successfully. BA4825...

  • Page 61: Daily Maintenance

    The air filters will not function normally if the filters are soiled by very fine dust (fine powder) or clogged. Do not install the BA4825 in a place where the BA4825 is exposed to much dirt and dust (including fine powder) or the humidity is high and condensation can easily occur.

  • Page 62: Storage, Repacking, And Transportation

     Disconnect the power cord from the power outlet and the main unit.  Store the BA4825 in a place, e.g., on a shelf or rack, so that no object will fall on the BA4825 and the BA4825 will not be exposed to dust.

  • Page 63: Performance Testing

    6.4 Performance Testing Performance testing is conducted as part of preventive maintenance to prevent performance degradation of the BA4825. Performance testing is also conducted as part of acceptance inspection, periodic inspection, performance verification after repair, and so forth. If the result of a performance testing does not meet the specifications, calibration or repair is required.

  • Page 64: Measurement Of Maximum Output Voltage

    <1> Set the waveform of the signal generator to sine wave, and set the frequencies shown in "Table 6-1 Judgment of BA4825 Performance". <2> Set the output on/off switch of the BA4825 to ON. <3> Increase the output voltage of the signal generator gradually from 0 V.

  • Page 65: Measurement Of Maximum Output Power

    Terminating resistor  Test procedure <1> Set the output on/off switch of the BA4825 to ON. <2> Set bias addition to ON, and increase the dial gradually from 5.00. <3> Record the output voltage value immediately before the overload LED (OVLD) lights. A maximum output power value is obtained by conversion according to the formula (output ...

  • Page 66: Measurement Of Frequency Characteristics

    6.4.3 Measurement of frequency characteristics  Connection Connect an FRA5097 frequency response analyzer (FRA) and terminating resistor as shown in "Figure 6-4 Measurement of Frequency Characteristics".  Setting Set the BA4825 as follows: Item Setting Input switching 50  Input impedance Bias addition OFF, dial 5.00...

  • Page 67: Figure 6-4. Measurement Of Frequency Characteristics

    6.4 Performance Testing BA4825 Terminating 200  resistor Figure 6-4. Measurement of Frequency Characteristics BA4825...

  • Page 68: Measurement Of Gain Error

    Indication logFR  Test procedure <1> Set the gain of the BA4825 and the output voltage of the FRA as shown in "Table 6-1 Judgment of BA4825 Performance". <2> Turn on FRA output. <3> Make a measurement in the continuous mode.

  • Page 69: Measurement Of Sine Wave Distortion Factor

     Test procedure <1> Adjust the output level of the audio analyzer so that the output voltage of the BA4825 is 80 Vrms. <2> Measure the sine wave distortion factors at frequencies of 40 Hz, 1 kHz, and 100 kHz.

  • Page 70: Measurement Of Bias-Added Voltage

    Terminating resistor  Test procedure <1> Before starting a measurement, adjust the offset voltage of the BA4825 to zero according to "3.5.4 Fine output offset adjustment". <2> Set bias addition of the BA4825 to ON and change the dial gradually from 5.00.

  • Page 71: Table 6-1. Judgment Of Ba4825 Performance

    6.4 Performance Testing The performance of the BA4825 is normal if the following criteria are satisfied: Table 6-1. Judgment of BA4825 Performance Measured Set frequency Criterion Judgment value Measurement of 40 Hz 100 Vrms or more _ _ . _ _...

  • Page 73: Specifications

    Safety and EMC ······················································· 7-10 7.10 Ambient Temperature Range, Ambient Humidity Range, Etc. ······························································ 7-11 7.11 External Dimensions and Weight······························ 7-12 Values that indicate accuracy are guaranteed values, but values that do not indicate accuracy are nominal or typical (typ.) values. BA4825...

  • Page 74: Input

    Switchable between 50  and 10 k (unbalance, in the case of simultaneous input of A and B)  Maximum input voltage 10 V  Non-destructive maximum input voltage 11 V  Input terminal BNC connector Number of pins: 2 Input A: Front panel, Input B: Rear panel The Lo side is connected to the housing. BA4825...

  • Page 75: Output

    1 MHz to 2 MHz 250 V range: Resistance load 1250  250 V to +50 V DC to 500 kHz 240 V to 40 V 500 kHz to 1 MHz 200 V to 80 V 1 MHz to 2 MHz BA4825...
  • Page 76 The switch on the front panel can be used to turn on and off output DC bias.  Harmonic distortion factor 0.1% or less (40 Hz to 1 kHz, output 80 Vrms) 1% or less (1 kHz to 100 kHz, output 80 Vrms) BA4825...
  • Page 77 Condition: Input terminal shorted, measurement band 10 Hz to 1 MHz 50 mVrms or less  Output impedance  0.5  + 1.5 H (typ.)  Output terminal BNC connector (front panel) The Lo side is connected to the housing. BA4825...

  • Page 78: Figure 7-1. Output Voltage/Current Range (Ac)

    出力電圧 （V） Output voltage range 出力電圧レンジ 150 V to +150 V −150 V〜+150 V −1.0 Output current 出力電流 （A） −100 Output voltage range 出力電圧レンジ 250 V to +50 V −250 V〜+50 V −200 Figure 7-1. Output Voltage/Current Range (AC) BA4825...

  • Page 79: Figure 7-2. Output Voltage/Current Range (Dc)

    出力電圧 （V） Output voltage range 出力電圧レンジ −150 V〜+150 V 150 V to +150 V −1.0 Output current 出力電流 （A） −100 Output voltage range 出力電圧レンジ −250 V〜+50 V 250 V to +50 V −200 Figure 7-2. Output Voltage/Current Range (DC) BA4825...

  • Page 80: Monitor Output

    When an abnormality is detected, the overload LED on the front panel is turned on. If the abnormal temperature state lasts for 10 seconds, output turns off. If the state lasts for 60 seconds, a transition is made to sleep operation. * Sleep operation: All the operations except power-off are disabled. BA4825...

  • Page 81: External Control I/O

    D-sub 9-pin multiconnector (rear panel, female, M2.6 screw) 7.6 Output On/Off Control Output on/off: Controllable using the switch on the front panel or external control input (When external control is used, the switch on the front panel can be set to OFF only.) BA4825...

  • Page 82: Setting At Power-On

     EN 61000-3-2:2006  EN 61000-3-3:1995 + A1:2001 + A2:2005 * The output may become off if the BA4825 is exposed to a strong radiated radio frequency electromagnetic field. *This product may cause interference if used in residential areas. Such use must be avoided unless the user takes special measures to reduce electromagnetic emissions to prevent interference to the reception of radio and television broadcasts.

  • Page 83: Ambient Temperature Range, Ambient Humidity Range, Etc

    The absolute humidity must be within the range 1 to 29 g/m , with no condensation. Figure 7-3 shows the ambient temperature and humidity ranges. Storage condition Performance guarantee Operation guarantee 10 50 C Figure 7-3. Ambient Temperature and Humidity Ranges 7-11 BA4825...

  • Page 84: External Dimensions And Weight

    7.11 External Dimensions and Weight 7.11 External Dimensions and Weight  External dimensions Width: 258 mm Height: 132.5 mm Depth: 390 mm (Projections are not included.)  Weight About 7 kg Figure 7-4 shows the external dimensions. 7-12 BA4825...

  • Page 85: Figure 7-4. External Dimensions

    7.11 External Dimensions and Weight Figure 7-4. External Dimensions 7-13 BA4825...
  • Page 86 All NF products are warranted against defects in materials and workmanship for a period of one year from the date of shipment. During the warranty period, NF will repair the defective product without any charge for the parts and labor. For repair service under warranty, the product must be returned to NF representatives.
  • Page 87  We assume no responsibility for influences resulting from the operations in this manual. Copyright 2006-2014, NF Corporation BA4825 Instruction Manual NF Corporation 6-3-20, Tsunashima Higashi, Kohoku-ku, Yokohama...
  • Page 88 NF Corporation 6-3-20, Tsunashima Higashi, Kohoku-ku, Yokohama 223-8508 JAPAN...

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