Digital Storage Oscilloscope GDS-3000 Series POWER ANALYSIS MANUAL GW INSTEK PART NO.
October 2010 This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.
TABLE OF CONTENTS Table of Contents GETTING STARTED ........................................................... 4 Activating Optional Software ................. 5 Set the Deskew ...................................... 7 QUICK REFERENCE ........................................................... 9 Menu Tree / Operation Shortcuts ........ 10 MEASUREMENT .............................................................. 13 Power Analysis ..................................... 14 Power Quality ......................
GETTING STARTED GETTING STARTED This chapter describes how to install the power analysis software as well as how to deskew the probes. Activating Optional Software ............................................. 5 Set the Deskew ..................................................................
GETTING STARTED Activating Optional Software Background The GDS-3000 has Power Analysis software (page 13), Serial bus decoding software as well as other GW Instek software packages as optional extras. An activation key is required to activate the software. An activation key is required for each optional software package. For the latest files and information regarding the optional software packages, see the GW Instek website: www.gwinstek.com XX.
GDS-3000 Power Analysis User Manual 5. Use the Variable knob and Select key to select the activation key from the USB root directory. When prompted to continue, press the Select key again. Files: Confirm Activation key 6 XX.LIS Press the Test key on the front panel and Power Analysis from the bottom menu to see if the Power Analysis activation worked.
GETTING STARTED Set the Deskew The deskew function is used to compensate for the propagation delay between the oscilloscope and the probe. For power measurements this is especially important as voltage and current probes are often used in measurements and have differing propagation delays. Background The deskew function allows the time delay between voltage and current probes to be equalized. Panel operation 1. If necessary configure a channel as See the user manual.
GDS-3000 Power Analysis User Manual Example 8 Before deskew After deskew
QUICK REFERENCE QUICK REFERENCE This chapter depicts the power analysis menu tree. Use them as a handy reference to get quick access to the functionality. Menu Tree / Operation Shortcuts .................................... 10 Test key – Power Analysis - Power Quality...................... 10 Test key – Power Analysis - Harmonics (None).............. 10 Test key – Power Analysis - Harmonics (IEC) ................ 11 Test key – Power Analysis - Ripple ...................................
GDS-3000 Power Analysis User Manual Menu Tree / Operation Shortcuts Test key – Power Analysis - Power Quality Test key – Power Analysis - Harmonics (None) 10
QUICK REFERENCE Test key – Power Analysis - Harmonics (IEC) Test key – Power Analysis - Ripple 11
GDS-3000 Power Analysis User Manual Test key – Power Analysis - Inrush 12
MEASUREMENT MEASUREMENT Power Analysis ................................................................ 14 Power Analysis overview .................................................... 14 Power Quality .................................................................. 15 Power Quality parameter overview ................................... 15 Using Power Quality Measurements ................................. 16 Harmonics ......................................................................
GDS-3000 Power Analysis User Manual Power Analysis The Power Analysis software provides automatic measurement for a number of advanced measurement types such as power quality, harmonics, ripple and inrush current. The Power analysis software is an optional software module. To install the optional software module, please see page 5. Power Analysis overview Power Quality Power quality measures the power of a signal from the voltage and current measurement.
MEASUREMENT Power Quality Power Quality parameter overview All the following parameters are used for power quality measurements.
GDS-3000 Power Analysis User Manual Using Power Quality Measurements Background For typical power measurements, one channel is used to measure voltage using a differential probe and the other channel is used to measure current using a current probe. In the example below, the power quality of an AC power source is tested. WARNING Ensure safe working practices are adhered to when working with live voltages. Failure to do so could lead to electric shock or loss of life.
MEASUREMENT Attenuation Matching the probe settings Coupling DC Impedance Matching the probe output (typically 1MΩ) 5. Configure the channel with the current probe to the following settings: Probe Current Attenuation As suitable (typically x10 ) Coupling DC Impedance Matching the probe (typically 1MΩ) 6. Connect and turn on the AC power source when all the connections have been made and configured. Panel operation 1. Press the Test key on the front panel. 2.
GDS-3000 Power Analysis User Manual 5. Press Define Inputs from the lower menu. 6. Choose the Voltage input (differential voltage source) from the side menu. Range CH1~4 7. Choose the Current input (current probe source) from the side menu. Range CH1~4 8. Press Meas. Display. 9. Choose what type of automatic measurements should be displayed from the side menu. Range Turn Off All Meas. Normal Inrush Ballast Turn On All Meas.
MEASUREMENT 10. Press Frequency Reference from the bottom menu. 11. Choose Voltage or Current as the frequency reference. Range Gating Voltage, Current To set the measurement area press Gating from the bottom menu and select the Gating mode from the side menu. See the user manual for more details.
GDS-3000 Power Analysis User Manual Harmonics Harmonics parameter overview All the following parameters are used for harmonic measurements. Measurement 20 None IEC 61000-3-2 * Frequency (Hz) All classes Magnitude (%) All classes Mag. RMS (A) All classes Phase (˚) Limit (A) A, B C.1, C.3,D Limit (%) C.
MEASUREMENT Harmonic 3 C.3 Harmonic 5 C.3 *A, B, C.1, C.2, C.3, D are Class A, Class B, Class C (Table 1), Class C (Table2), Class C (Table 3), Class D Define Harmonic Inputs Background Current and voltage inputs must be defined for harmonic measurements. Background For harmonic measurements, one channel is used to measure voltage using a differential probe and the other channel is used to measure current using a current probe.
GDS-3000 Power Analysis User Manual 2. With the power disconnected from the AC power source, connect the differential voltage probe to the Line and Neutral wires and the current probe to the Line wire. 3. Connect the differential probe and current probe to an input channel. 4. Configure the channel with the differential probe to the following settings: Probe Voltage Attenuation Matching the probe settings Coupling DC Impedance Matching the probe output (typically 1MΩ) 5.
MEASUREMENT 3. Press Harmonics from the side menu. 4. The automatic measurements for Harmonics appear (when using default settings). Example IEC 61000-3-2 5. Press Define Inputs from the lower menu. 6. Choose the Voltage input (source) from the side menu. Range CH1~4 7. Choose the Current input (source) from the side menu.
GDS-3000 Power Analysis User Manual Choosing a Harmonic Standard Test Panel operation 1. Press the Test key. 2. Press Power Analysis from the bottom menu. 3. Press Harmonics from the side menu. 4. Press Test to Standard from the lower menu. 5. Choose the desired Test Standard from the side menu. Standard None, IEC 61000-3-2 Harmonics Setup – Default (None) Background The setup menu depends entirely on the test standard chosen. If no test standard is chosen the default harmonics setup is used.
MEASUREMENT 4. Press Setup from the lower menu. 5. Set the Number of Harmonics from the side menu. Range 20-~400 6. Choose the Harmonics Source. Source V, I 7. Set the Frequency Reference. Reference V, I, Harmonics source, Fixed 8. If Fixed was set as the frequency reference, set the Fixed Reference frequency. Reference 10Hz~400Hz Harmonics Setup – IEC Background The following Setup menu is only applicable when IEC is chosen as the testing standard. See page 24 for details. Panel operation 1.
GDS-3000 Power Analysis User Manual 3. Press Harmonics from the side menu. 4. Press Setup from the lower menu. 5. Set the Line Frequency from the side menu. Range 50, 60 Hz 6. Choose the Observation Period. Time Default Settings 200ms~ 150 seconds Press Set to IEC Defaults to set to IEC default settings. Default Observation Period. 10s Grouping. On Filter. On Device Class Four device classes can be chosen for the IEC standard. 1. Press More from the Setup side menu. 2.
MEASUREMENT Pow. Fact. 0.00~1.00 Current 100mA~16.0A 4. For class C(Table 3) and Class D devices, choose the Input Power. Power Filter, Grouping and Hysteresis 0~600 W, 10Watt increments The filter function applies a 1.5 second smoothing filter function. The Grouping function groups interharmonic measurements. 1. Press more twice from the side menu. Filter 2. Press Filter to toggle the filter time on or off for 1.5 seconds. Filter Grouping On, Off 3. Press Grouping to toggle grouping on or off.
GDS-3000 Power Analysis User Manual Harmonics Display options Background Harmonic measurements can be displayed onscreen in graph or table format. When in graph format, a harmonic must be chosen for individual measurements. Panel operation 1. Press the Test key. 2. Press Power Analysis from the bottom menu. 3. Press Harmonics from the side menu. 4. Press Display from the lower menu. 5. Choose to display harmonic measurements as a graph or as a table. Range Table, Graph 6.
MEASUREMENT 7. Press Select and use the Variable knob to choose a harmonic measurement to view or to navigate the harmonic list. Select 1~number of measurement results Table Example Graph Example Save Harmonic Measurements Background All harmonic measurements can be saved internally or to USB. The files are stored as .CSV. Panel operation 1. Press the Test key. 2. Press Power Analysis from the bottom menu.
GDS-3000 Power Analysis User Manual 3. Press Harmonics from the side menu. 4. Press Save Meas. To File from the lower menu. File Type Each measurement that is saved is saved as HarmXXXX.CSV into the designated USB file path. Each file is numbered sequentially from 0000 to 9999. For example the first file will be saved as Harm0000.CSV, the second as Harm0001.CSV, and so on. Data The data that is saved depends on whether Test to Standard is set to None or to IEC 61000-2-3. Please page 20 for details.
MEASUREMENT Ripple Using Ripple Measurements Background WARNING Connection The ripple function allows power supply ripple to be measured with ease. The function allows automatic vertical scaling to maximize the vertical resolution of the measurement by isolating the AC component from the DC waveform. Ensure safe working practices are adhered to when working with live voltages. Failure to do so could lead to electric shock or loss of life.
GDS-3000 Power Analysis User Manual Impedance Matching the probe output (typically 1MΩ) 4. Connect and turn on the power source when all the connections have been made and configured. Panel operation 1. Press the Test key. 2. Press Power Analysis from the bottom menu. 3. Press Ripple from the side menu. 4. The automatic measurements for Ripple appear (when using default settings). Example 5. Press Define Inputs from the lower menu. 6. Choose the Voltage input (source) from the side menu.
MEASUREMENT 7. Choose the Current input (source) from the side menu. Range CH1~4 8. Press Source from the bottom menu to toggle the ripple source type. Source V, I 9. To automatically set the vertical scale, press Do Vertical Autoset. This will offset the DC component to maximize the accuracy of the ripple measurement.
GDS-3000 Power Analysis User Manual Inrush Using Inrush Current Measurements Background WARNING The GDS-3000 is able to quickly measure the inrush current generated when a power supply is first turned on. The Inrush function can measure the first and second peak. Ensure safe working practices are adhered to when working with live voltages. Failure to do so could lead to electric shock or loss of life. Connection Current probe: Line Setup 1.
MEASUREMENT 4. Connect and turn on the power source when all the connections have been made and configured. Panel operation 1. Press the Test key. 2. Press Power Analysis from the bottom menu. 3. Press Inrush Current from the side menu. 4. The automatic measurements for inrush current appear measuring the first and second inrush current peaks. (default settings) Example 5. Press Define Inputs from the lower menu. 6. Choose the Current input (source) from the side menu.
GDS-3000 Power Analysis User Manual Note To effectively measure inrush current, use the oscilloscope in Single mode to capture the inrush current when it occurs. A voltage source cannot be selected for inrush current.
INDEX INDEX Activation keys ............................ 5 Deskew .......................................... 7 Harmonics .................................. 20 Inrush .......................................... 34 Optional software activation ......................................... 5 Power Analysis .......................... 14 harmonics overview..................... 20 Inrush ............................................. 34 overview ........................................ 14 power quality overview ....
