xx ZZZ TCPA300/400 Amplifiers & TCP300/400 Series AC/DC Current Probes User Manual *P077118300* 077-1183-00
xx ZZZ TCPA300/400 Amplifiers & TCP300/400 Series AC/DC Current Probes User Manual Revision A This document applies for firmware version 1.0 and above. www.tektronix.
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved. TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Warranty Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
Table of Contents General Safety Summary .......................................................................................... Compliance Information ......................................................................................... EMC Compliance............................................................................................ Environmental Considerations .............................................................................. Preface ............................................
Table of Contents Shutdown Error ............................................................................................... Specifications ...................................................................................................... Warranted Specifications..................................................................................... Nominal and Typical Characteristics ....................................................................... Mechanical Characteristics ...................
List of Figures Figure 1: Typical TCPA300/400 current measurement system................................................ Figure 2: Using the probe covers ................................................................................. Figure 3: Equipment locations in the travel case ............................................................... Figure 4: Connecting and disconnecting a current probe to the amplifier.................................... Figure 5: TCP312 and TCP305 slide operation ...........
Table of Contents List of Tables Table 1: Amplifier options......................................................................................... Table 2: Service options ........................................................................................... Table 3: Unpowered circuit degauss limits ..................................................................... Table 4: Automobile charging systems test setup..............................................................
General Safety Summary General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. While using this product, you may need to access other parts of a larger system. Read the safety sections of the other component manuals for warnings and cautions related to operating the system.
General Safety Summary Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. Terms in this Manual These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION.
Compliance Information This section lists the EMC (electromagnetic compliance) and environmental standards with which the instrument complies. EMC Compliance EC Declaration of Conformity – EMC Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility. Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities: EN 61326-1:2006, EN 61326-2-1:2006.
Compliance Information Australia / New Zealand Declaration of Conformity – EMC FCC – EMC viii Complies with the EMC provision of the Radiocommunications Act per the following standard. CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in accordance with EN 61326-1:2006 and EN 61326-2-1:2006. Emissions are within the limits of FCC 47 CFR, Part 15, Subpart B for Class A equipment.
Compliance Information Environmental Considerations This section provides information about the environmental impact of the product. Product End-of-Life Handling Observe the following guidelines when recycling an instrument or component: Equipment Recycling. Production of this equipment required the extraction and use of natural resources. The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product’s end of life.
Compliance Information x TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
Preface This User Manual supports the operation and basic maintenance of the TCPA300 and TCPA400 Current Probe Amplifiers, and the TCP300/400 Series AC/DC current probes that mate with the amplifiers.
Preface xii TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
Getting Started The TCPA300 and TCPA400 current probe amplifiers let you use one probe to simultaneously measure AC and DC current. The amplifiers convert the sensed current into a proportional voltage signal that you can measure directly with an oscilloscope. The TCPA300 and TCPA400 current probe amplifiers provide better linearity than other current measurement systems because of a current feedback process used with the probe.
Getting Started TCPA300 and TCPA400 Current Probe Amplifiers Current Probes The amplifier amplifies the current sensed by the probe and converts the current to a proportional voltage that is displayed on an oscilloscope or other similar measuring device.
Getting Started Options Table 1-1 lists options that are available for the TCPA300 and TCPA400 amplifiers. Table 1: Amplifier options Option Description A1 Universal Euro power cord A2 United Kingdom power cord A3 Australia power cord A5 Switzerland power cord A6 Japan power cord AC China power cord A99 No power cord Tektronix service options that you can order for your amplifiers and probes are listed in this section. (See Table 2.
Getting Started Standard Accessories The following accessories are shipped with the amplifiers and probes. Amplifiers The following accessories are shipped with the TCPA300 and TCPA400 amplifiers.
Getting Started Probe Covers The TCP300/400 Series Current Probes come with a probe cover that stores the probe when not in use. Use the probe cover to hold your probe in a convenient place at your bench or workstation when you are not using it. You can attach the probe cover to the side of the bench to keep the probe off of your work surface. (See Figure 2.
Getting Started Travel Case The travel case is a recommended accessory for the TCPA300/400 Amplifiers. The travel case includes room to store one amplifier and two TCP300/400 Series Current Probes, one of each size. (For example, you can store a TCP305 and a TCP303 probe.) A compartment is included to store associated cables and terminations. (See Figure 3.) Figure 3: Equipment locations in the travel case 1. Large current probe 2. Probe holders 3. Small current probe 4. Amplifier 5.
Getting Started Connecting the Amplifier to an Oscilloscope You will need an oscilloscope to display the TCPA300 and TCPA400 measurement output. To use the full dynamic range of the probe/amplifier combination, the oscilloscope must be capable of displaying a vertical scale factor of 1 mV/div to 1 V/div. If you are using a TEKPROBE II-compatible oscilloscope, use the TEKPROBE-to-TEKPROBE interface cable.
Getting Started Connecting a Current Probe to the Amplifier To connect a current probe to the amplifier input connector, do the following and refer to the illustration. (See Figure 4.) 1. To connect the probe, align the red dots. 2. Push the probe connector in. Do not twist the connector. 3. To disconnect the probe, pull back the collar. 4. Pull out the connector. Figure 4: Connecting and disconnecting a current probe to the amplifier CAUTION. Handle current probes with care.
Getting Started Operating the Current Probe Slide The current probes each have a slide mechanism that opens and closes the probe jaw. This allows you to clamp the probe around a conductor under test. The slide must be locked closed to accurately measure current or to degauss the probe. If a probe is unlocked, the PROBE OPEN indicator on the amplifier will light. WARNING. Do not clamp the TCP305 or TCP312 current probes around uninsulated wires. Damage to the probe or personal injury may result.
Getting Started The slide operation of the TCP303 and TCP404XL current probes is shown in the following illustrations. To open the probe: 1. Press the bottom of the lock button. 2. Squeeze the handle until the core is open. 3. Place the probe core around the conductor. Figure 6: Unlock and open the TCP303 and TCP404XL 4. To lock the probe, release the squeeze handle. 5. Press the top of the lock button.
Getting Started Degaussing and Autobalancing the Current Probe Degaussing the probe removes any residual magnetization from the probe core. Such residual magnetization can induce measurement error. Autobalancing removes unwanted DC offsets in the amplifier circuitry. Failure to degauss the probe is a leading cause of measurement errors. The DEGAUSS LED flashes until you degauss the probe.
Getting Started DC Measurements To measure DC current, first degauss the probe: 1. Verify that the amplifier and the oscilloscope input coupling are set to DC, and the input impedance is set to 50 Ω. 2. Lock the probe closed without a conductor passing through it. 3. Adjust the ground reference of the oscilloscope to move the trace to the desired graticule line. 4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. The NOT TERMINATED INTO 50 Ω LED is lighted if impedance is not 50 Ω.
Getting Started The current probe is shown connected to a power supply line. (See Figure 8.) Notice that the probe arrow points toward the negative terminal of the power supply to conform to the conventional current flow of positive (+) to negative (-). To measure DC current, perform these steps: 1. Open the probe slide, place the probe around the conductor under test, and then lock the slide. 2.
Getting Started AC Measurements To measure AC current only, and remove the DC component of the current being measured, follow the instructions below. These are identical to the instructions for DC current measurements except that the amplifier coupling in step 2 is set to AC. 1. Verify that the oscilloscope input coupling is set to DC. 2. Verify that the amplifier input coupling is AC, and the input impedance is set to 50 Ω. (The NOT TERMINATED INTO 50 Ω LED is on if impedance is not 50 Ω.) 3.
Control Summary This section describes the function of each TCPA300 and TCPA400 front panel control and connector. The overview shows most functions and is followed by a detailed description. (See Figure 9.) Some seldom-used functions do not appear in the illustration. These functions are completely discussed in the detailed descriptions that follow this illustration. Figure 9: The TCPA300 front panel 1. The PROBE DEGAUSS AUTOBALANCE button removes residual magnetism from the attached current probe.
Control Summary 6. The current probes connect to the TCPA300 and TCPA400 at the PROBE INPUT connector. 7. The COUPLING button selects AC or DC probe coupling, as indicated by the LEDs. 8. The RANGE button toggles between the two scale factors that are available for the attached probe (TCPA300 only). LEDs indicate the selected range. TCPA300 and TCPA400 Controls These front panel controls and indicators are common to both the TCPA300 and TCPA400 current probe amplifiers, unless otherwise indicated.
Control Summary buttons, another degauss operation may be necessary to ensure accurate measurements. Generally, if you change the DC offset by more than 5 divisions, you should de-energize the circuit under test and perform another degauss routine. Then, reenergize the circuit and take your measurements.
Control Summary NOT TERMINATED When lit, this indicator informs you that the TEKPROBE interface cable or BNC cable from the OUTPUT of the amplifier is not connected to a 50 Ω input on the oscilloscope. You need to switch the termination setting on the oscilloscope to 50 Ω, or use a 50 Ω termination on the oscilloscope input. NOTE. NOT TERMINATED INTO 50 Ω is only detected during the DEGAUSS AUTOBALANCE operation.
Control Summary about connecting a probe is available. (See page 8, Connecting a Current Probe to the Amplifier.) OUTPUT Connector The amplifier current measurement output is accessed at the OUTPUT connector, which should be connected to the oscilloscope input. Attach one end of a 50 Ω BNC cable to this connector and the other end to a 50 Ω vertical input of your oscilloscope. The output impedance of the amplifier is 50 Ω.
Control Summary Refer to your oscilloscope manual for instructions on using the GPIB bus.
Reference Notes These notes are provided to help you utilize the full potential of the TCPA300 and TCPA400 current probe systems. Degaussing a Probe with an Unpowered Conductor in the Jaws Under almost all conditions, you can degauss your current probe while a conductor of an unpowered circuit is clamped in the jaws. The advantage of degaussing with an unpowered circuit is that any offset from stray DC magnetic fields are compensated.
Reference Notes Measuring Differential Current You can place two conductors in a current probe to provide differential or null current measurement. (See Figure 10.) This avoids the necessity of using two current measurement systems with a differential oscilloscope. Figure 10: Measuring two conductors WARNING. To avoid injury or loss of life from shock or fire, do not put more than one uninsulated conductor at a time in the TCP303 or TCP404XL probes.
Reference Notes Figure 11: Measuring differential current and nulls 3. Measure the current. A waveform above the baseline indicates the conductor with the conventional current flow (I1, in the direction of the probe arrow), is carrying the greater current. Conventional current flows from positive to negative. 4. To adjust for a current null, adjust the current in one of the conductors until the displayed measurement is zero.
Reference Notes AC and DC Coupling You can couple the signal input to the TCPA300 and TCPA400 with either DC or AC coupling. DC coupling shows the DC and AC measurement components while AC coupling removes the DC component from the displayed signal. When you use AC coupling, make sure that the input DC current does not exceed the probe specifications. AC coupling will affect waveforms at frequencies higher than the AC Coupling Low-Frequency Bandwidth.
Reference Notes Maximum Current Limits Current probes have three maximum current ratings: continuous, pulsed, and Ampere-second product. Exceeding any of these ratings can saturate the probe core, magnetizing the core and causing measurement errors. Maximum Continuous Current refers to the maximum current that can be continuously measured at DC or at a specified AC frequency. (See page 47, Specifications.
Reference Notes Procedure A: Maximum Allowable Pulse Width To determine the maximum allowable pulse width do the following: 1. Measure the peak current of the pulse. 2. Divide the Ampere-second (or Ampere-microsecond) specification for the range setting of the probe by the measured peak current of the pulse. The quotient is the maximum allowable pulse width (PWmax). For example, the TCP312 Current Probe has a maximum Ampere-second product of 500 Arms in the 10 A/V range setting.
Reference Notes Procedure B: Maximum Allowable Pulse Amplitude To determine the maximum allowable pulse amplitude do the following: 1. Measure the pulse width at the 50% points. 2. Divide the Ampere-second (or Ampere-microsecond) specification for the range setting of the probe by the pulse width. The quotient is the maximum allowable pulse amplitude; the peak amplitude of the measured pulse must be less than this value.
Reference Notes Measuring Noncontinuous Current with the TCP404XL Probe When you measure a noncontinuous current with the TCP404XL probe, you need to take into consideration several factors to ensure that you make accurate measurements and do not trip the thermal overload circuit. The amplitude and duty cycle of the continuous and noncontinuous current, and the ambient temperature, all affect the maximum amount of time allowed for the measurement, which defines the safe operating area of the probe.
Reference Notes WARNING. To prevent injury, keep your hands away from the probe head until it has had time to cool after disconnecting the probe from the circuit. Because when using the probe near the upper current limit and maximum ambient temperature for extended lengths of time, the probe head surface can become hot to the touch. To see how noncontinuous current amplitude affects measurement time, look at the curves for measurements of 200 A continuous between the two graphs. (See Figure 34 on page 56.
Reference Notes Extending Current Range You may encounter situations where your measurement exceeds the maximum current rating of the connected probe. This section discusses methods for extending AC and DC current ranges without exceeding specified limits. WARNING. To avoid personal injury or loss of life due to shock or fire, do not exceed the specified electrical limits of the TCPA300 and TCPA400 or any applicable accessories.
Reference Notes NOTE. Adding a second conductor to the probe increases the insertion impedance and reduces the upper bandwidth limit of the probe. You can increase the value of the bucking current by winding multiple turns of the second conductor around the probe, as shown in the illustration. (See Figure 16.) Figure 16: Adding multiple turns The bucking current is equal to the current flowing in the conductor, multiplied by the number of turns wound around the probe.
Reference Notes Increasing Sensitivity If you are measuring DC or low-frequency AC signals of very small amplitudes, you can increase measurement sensitivity of your Current Probe by winding several turns of the conductor under test around the probe as shown. The signal is multiplied by the number of turns around the probe. WARNING. To avoid injury or loss of life, do not put more than one uninsulated conductor at a time in the probe jaws.
Application Notes Application Notes This section describes some of the typical measurement applications of the TCPA300 and TCPA400 Current Probe Amplifiers: Automobile Charging Systems Inductance Measurements Continuity Test of Multiple-Conductor Cable Measuring Inductor Turns Count Power Measurement and Analysis Software Applications Automobile Charging Systems Most automotive charging systems are three-phase alternators with a diode rectifier network.
Application Notes Figure 18: Setup for measuring charging current The waveform (a) shows the three-phase ripple frequency. (See Figure 19.) The average charge current is approximately 27 A with a minimum peak of approximately 23 A and a maximum peak of approximately 31 A. The waveform shows a continuous cycle with no dropouts, so the alternator circuit appears to be functioning properly. A single-phase diode failure normally appears as an extreme drop in charge current every third cycle, waveform (b).
Application Notes Inductance Measurements You can use the TCPA300 and TCPA400 to measure inductance of coils. Two different methods can be used: one for low-impedance pulse sources and another for high-impedance pulse sources of known value. Low-Impedance Pulse Sources This figure shows a constant-voltage pulse generator of extremely low output impedance connected to an inductor that has low resistance. (See Figure 20.) 1. Connect the inductor across the output terminals of the pulse generator. 2.
Application Notes 4. Measure the current ramp. The inductance is effectively defined by the slope of the current ramp shown here. Figure 21: Linear current vs. time ramp 5. Calculate the inductance using the following formula: where: L is the inductance in henries, E is the voltage of the pulse generator, dt is the change in time, and di is the change in current.
Application Notes High-Impedance Pulse Sources If the pulse source has a higher impedance of known resistance, such that the output voltage drops as the current increases, the inductance of a coil can be calculated by the time constant of the charge curve. The current ramp shows how the values for the inductance formula are obtained. (See Figure 22 on page 37.
Application Notes Measuring Inductor Turns Count To obtain an approximate turns count of an inductor, do the following. (See Figure 23.) 1. Connect the inductor to a current limited source, as shown. 2. Measure the input current on one of the inductor leads. 3. Clamp the current probe around the inductor and note the current value. Figure 23: Measuring the number of turns in a coil The number of turns is equal to the ratio of coil current to input current.
Application Notes You must observe the polarity of coil current to determine whether the test coil has greater or fewer turns than the reference coil. The turns are calculated by using the formula: where N2 is the number of turns in the test coil, N1 is the number of turns in the reference coil, Im is the measured coil current, and I1 is the input current.
Troubleshooting and Error Codes Troubleshooting and Error Codes Possible problems that you may encounter when measuring current with the TCPA300 and TCPA400 are available. (See Table 5.) Use this as a quick troubleshooting reference. Table 5: Troubleshooting Problem Remedy Amplifier will not power on Check that the amplifier is plugged into a working AC outlet. Defective amplifier. Refer the instrument to qualified service personnel for repair.
Troubleshooting and Error Codes Table 5: Troubleshooting (cont.) Problem Remedy Degauss takes longer than 10 seconds Probe is attached to an energized circuit. Disconnect probe from circuit and retry. Probe is faulty - Probe transformer (defective Hall device with excessive noise or drift) may cause this symptom. May also be caused by a shorted or open wire in the probe cable assembly. Defective main board - If the probe is not the cause, then it is most likely a defective main board in the amplifier.
Troubleshooting and Error Codes Table 5: Troubleshooting (cont.) Problem Remedy Measurement aberrations exceed the specified limit The amplifier output is not terminated into 50 Ω load. Set the input impedance of the oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope input. Do not attach the termination to amplifier output. The measurement exceeds the maximum continuous current or Ampere-second product ratings of the Current Probe.
Troubleshooting and Error Codes Displaying Error Codes with the Probe Degauss Autobalance Button This section describes the error codes that the amplifiers display using the function indicator LEDs. When an internal error condition exists, the amplifiers may generate error codes. To display the error codes, do the following. (See Figure 25.) 1. Press the PROBE DEGAUSS AUTOBALANCE button. 2.
Troubleshooting and Error Codes For example, after you press the PROBE DEGAUSS AUTOBALANCE button, if the AC and DC Coupling LEDs are flashing, then an error code is being displayed: 1. In this example, the NOT TERMINATED INTO 50 Ω LED is illuminated. 2. This four-bit binary code (0010) indicates an Error Code 2: a null error in the DC offset circuit occurred. (See Figure 26.) Figure 26: Interpreting the error code display A complete list of error codes for the amplifier is listed in the table.
Troubleshooting and Error Codes Table 6: Amplifier error codes (cont.) Code Description of error Action to take 10 11 An error occurred while nulling out the internal DC offset of the amplifier. Power cycle the amplifier and run the Degauss/Autobalance adjustment routine again. If the error reoccurs, then remove the probe from the circuit. If this does not resolve the error, the amplifier needs service. 12 13 14 The amplifier cannot null out the probe DC offset voltage.
Troubleshooting and Error Codes 46 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
Specifications These specifications are valid only under the following conditions: The probe and amplifier have been calibrated at an ambient temperature of 23 ° ±5 °C. The probe and amplifier are operating within the environmental limits described in Table 4-6 on page 4-5 (the operating temperature limits are 0 °C to +50 °C, unless otherwise stated). The probe and amplifier have had a warm-up period of at least 20 minutes.
Specifications Nominal and Typical Characteristics Nominal and typical characteristics, listed in Table 4-2, are not guaranteed. They are provided to characterize the configuration, performance, or operation of typical probe/amplifier combinations. Table 8: Nominal and typical amplifier characteristics Installed probe Parameter TCP312 TCP305 TCP303 TCP404XL Ranges, nominal 1 A/V, 10 A/V 5 A/V, 10 A/V 5 A/V, 50 A/V 1 A/mV Maximum Amp-Second Product – Frequency deratings shown.
Specifications Table 8: Nominal and typical amplifier characteristics (cont.) Installed probe Parameter TCP312 TCP305 TCP303 TCP404XL Low Current Sensitivity Range 1 A/V Range 5 A/V Range 5 A/V Range N/A DC (continuous) 5A 25 A 25 A — DC (noncontinuous) N/A N/A N/A — RMS (sinusoidal) 3.5 A 17.7 A 17.7 A — Peak Pulse 50 A 50 A 500 A — Input Voltage 100-240 VAC (±10%), 47 Hz to 440 Hz, single phase Maximum Power 50 Watts maximum Fuse Rating 3.
Specifications Table 10: Probe mechanical characteristics TCP305 and TCP312 TCP303 and TCP404XL Length: 20 cm (7.77 inches) 268 mm (10.55 inches) Width: 1.6 cm (0.625 inches) 41 mm (1.60 inches) Height: 3.2 cm (1.25 inches) 68 mm (2.7 inches) Cable length 1.5 m (5 feet) TCP303: 2 m (6.6 feet) TCP404XL: 8 m (26.25 feet) Weight 0.15 kg (0.33 lb) TCP303: 0.66 kg (1.45 lb) TCP404XL: 0.88 kg (1.
Specifications Environmental Characteristics The environmental characteristics are warranted performance specifications. (See Table 12.) Unlike the warranted characteristics, the environmental characteristics are type tested; therefore there are no performance verification procedures provided to test these characteristics. Unless otherwise noted, these characteristics apply to all probes and amplifiers. (See page 47, Warranted Specifications.
Specifications Performance Graphs Figure 28: Frequency derating-TCP312 Figure 29: Frequency derating-TCP305 Figure 30: Frequency derating-TCP303 52 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
Specifications Figure 31: Frequency derating-TCP404XL TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual 53
Specifications Figure 32: Insertion impedance versus frequency 54 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
Specifications Figure 33: Specified operating area of the probes TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual 55
Specifications TCP404XL Maximum Measurement Times The maximum measurement time for the TCP404XL probe with varying duty cycles and temperatures are shown in the following three graphs. Details about the relationship between measurement factors are available. (See page 28, Measuring Noncontinuous Current with the TCP404XL Probe.
Specifications Figure 36: Measuring 750A noncontinuous at 23 °C ambient temperature At 23 degrees ambient temperature, 600 A can be measured continuously with the TCP404XL probe. Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object.
Specifications Table 13: Safety compliance information (cont.) Category Standards or description Additional Compliance UL 61010B-1. Safety requirements for electrical equipment for measuring, controlling and laboratory use. IEC61010-1/A2:1995. Safety requirements for electrical equipment for measurement, control, and laboratory use. IEC 61010-2-032:1995. Particular requirements for hand-held current clamps for electrical measurement and test. IEC 61010-1:2001.
Glossary amp-second product The unit of measure defining the maximum amount of pulsed current that can be measured before the probe core becomes saturated. The amp-second rating applies only to measurement values between the maximum continuous and maximum pulse current ratings of the probe. The amp-second rating is equal to the peak current multiplied by the pulse width at the 50% point.
Glossary Hall device A thin, rectangular piece of semiconductor material located in the core of the current probe. The Hall device uses the Hall effect for DC and low-frequency AC measurements. Hall effect The effect that produces a voltage potential in the Hall device when magnetic lines of force pass through the device. The voltage potential is directly proportional to the magnetic field strength. The voltage polarity is determined by the magnetic field polarity.
Index A AC coupling, 14, 18, 24 amp-second product, 59 Amp-second product, 25 Applications, 33 auto-balance, 59 Autobalance function, 16 B bucking current, 59 Bucking current, 30 Button COUPLING, 18 MANUAL BALANCE, 17 ON/STANDBY, 18 PROBE DEGAUSS/ AUTOBALANCE, 16 RANGE, 18 C Connecting a current probe to a circuit under test, 13 a current probe to the amplifier, 8 the amplifier to an oscilloscope, 7 Connector OUTPUT, 19 PROBE INPUT, 18 Continuity measurements, 37 Control summary, 15 conventional current,
Index O ON/STANDBY button, 18 Optional Accessories, 4 Options, 3 OUTPUT connector, 19 OVERLOAD indicator, 17 P Power on the amplifier, 7 PROBE DEGAUSS/AUTOBALANCE button, 11 PROBE DEGAUSS/AUTOBALANCE button and indicator, 16 PROBE DEGAUSS/AUTOBALANCE indicator, 16 Probe Holders, 5 62 PROBE INPUT connector, 18 PROBE OPEN indicator, 17 Probes coupling, 24 degaussing (demagnetizing), 11, 16 description, 2 extending the current range, 30 increasing the current limit, 30 maximum current limits, 25 operating
