Fluke 52120A User manual

February 2012
© 2012 Fluke Corporation. All rights reserved.Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
52120A
Transconductance Amplifier
Users Manual

i
Table of Contents
Chapter Title Page
1 Introduction and Specifications......................................................... 1-1
Introduction........................................................................................................ 1-3
How to Contact Fluke ........................................................................................ 1-3
Safety Information ............................................................................................. 1-4
Symbols ......................................................................................................... 1-5
Protective Earth (Grounding) ........................................................................ 1-6
Instruction Manuals ........................................................................................... 1-6
52120A Getting Started Manual.................................................................... 1-6
52120A Users Manual................................................................................... 1-6
How to Unpack and Examine the Product......................................................... 1-7
Service Information ........................................................................................... 1-7
How to Place and Rack Mount the Product ....................................................... 1-7
Cooling Considerations...................................................................................... 1-7
How to Connect the Product to Mains Power.................................................... 1-8
Front-Panel Features .......................................................................................... 1-10
Rear-Panel Features ........................................................................................... 1-12
Input and Output Connections ........................................................................... 1-13
Input Terminals ............................................................................................. 1-13
Output Terminals........................................................................................... 1-14
Product Connection Cables................................................................................ 1-14
Safe Working Practice................................................................................... 1-15
How to Connect the Product to an External Circuit ...................................... 1-15
How to Disconnect the Product from an External Circuit............................. 1-15
Accessories ........................................................................................................ 1-15
General Specifications ....................................................................................... 1-16
Electrical Performance Limits ........................................................................... 1-16
Performance Specifications ............................................................................... 1-17
Operated within 6105A or 6100B Control Loop, Sine or
Harmonic Input (all current ranges) .............................................................. 1-17
Coverage factor k=2.58 (99 % confidence level)...................................... 1-17
Coverage factor k=2.00 (95 % confidence level)...................................... 1-18
Operated Stand Alone.................................................................................... 1-19
Coverage factor k=2.58 (99 % confidence level)...................................... 1-19
Coverage factor k=2.00 (95 % confidence level)...................................... 1-20

52120A
Users Manual
ii
52120A/COIL 3 KA 25-Turn Coil ................................................................ 1-21
52120A/COIL 6 KA 50-Turn Coil ................................................................ 1-21
2 Front-Panel Operation ........................................................................ 2-1
Introduction........................................................................................................ 2-3
Notes on Product Use ........................................................................................ 2-3
Accuracy........................................................................................................ 2-3
Potential Measurement Errors ....................................................................... 2-4
Leakage Paths............................................................................................ 2-4
Common-Mode Current ............................................................................ 2-4
External Voltage Connections................................................................... 2-6
Load Regulation ........................................................................................ 2-8
Product Operation Behavior .......................................................................... 2-8
Front-Panel Indicator Colors..................................................................... 2-8
Incompatible Key Selections..................................................................... 2-9
Status Indicators ........................................................................................ 2-9
Voltage Compliance Indictors ........................................................................... 2-10
Three Red LEDs Together or Product Self-Shutdown.............................. 2-10
How to Use the Product ..................................................................................... 2-10
Current Amplifier Operation ......................................................................... 2-10
Stand-alone Operation ................................................................................... 2-10
How to Setup Multiple Amplifiers .................................................................... 2-12
Greater than 120 Amps Operation................................................................. 2-12
Closed-Loop Operation ................................................................................. 2-14
Multi-Phase Current Outputs......................................................................... 2-17
How to Use the Accessory Coils with the Product ............................................ 2-19
Current/Hz Profile ......................................................................................... 2-19
Current Cable Connection ............................................................................. 2-19
Current Clamp Calibration ............................................................................ 2-19
Built-In Fan ................................................................................................... 2-19
3 Remote Operations ............................................................................. 3-1
Introduction........................................................................................................ 3-3
IEEE-488.2 Compliance .................................................................................... 3-3
How to Set the Bus Address .............................................................................. 3-3
Power On and *RST Conditions........................................................................ 3-4
SCPI Status Registers ........................................................................................ 3-4
Remote Commands............................................................................................ 3-5
Supported Common Commands.................................................................... 3-6
Supported SCPI Commands .......................................................................... 3-6
SCPI Command Summary ........................................................................ 3-7
52120A SCPI Command Details .............................................................. 3-8
6105A SCPI Command Details ................................................................ 3-11
Calibration and Adjustment Command Extensions....................................... 3-12
6105A *OPT? Command .............................................................................. 3-12
4 Operator Maintenance ........................................................................ 4-1
Introduction........................................................................................................ 4-3
How to Replace the Mains Input Fuse........................................................... 4-3
How to Clean the Air Filter ........................................................................... 4-3
How to Clean the Product.............................................................................. 4-4
Replaceable Parts............................................................................................... 4-4

Contents (continued)
iii
5 Calibration............................................................................................ 5-1
Introduction........................................................................................................ 5-3
Calibration Correction Factors ...................................................................... 5-3
Equipment Required ...................................................................................... 5-3
Initial Setup and Input Zero Adjustments...................................................... 5-3
Calibration Verification – Standalone Mode................................................. 5-5
Equipment Setup ....................................................................................... 5-7
2 Amp Range Verification ........................................................................ 5-7
20 Amp Range Verification ...................................................................... 5-9
120 Amp Range Verification .................................................................... 5-11
Current Input Burden Resistor Verification .............................................. 5-13
Amplitude Specification Limits, Pass/Fail Analysis ..................................... 5-13
Calibration Adjustment – Standalone Mode ................................................. 5-14
Equipment Set Up ..................................................................................... 5-14
How to Correct for Shunt Resistance Error .............................................. 5-16
Adjustment Process ................................................................................... 5-16
Adjustments Notes .................................................................................... 5-16
Adjustments .............................................................................................. 5-16
Calibration Verification – Closed-Loop with 6100A or 6105A.................... 5-22
Test Equipment ......................................................................................... 5-22
Power Line Frequency Confidence Check................................................ 5-22
Phase Angle Accuracy Confidence Check................................................ 5-23
Verify Amplitudes at DC and Higher Frequencies ................................... 5-23
Verify Phase Angles at Higher Frequencies ............................................. 5-26

52120A
Users Manual
iv

v
List of Tables
Table Title Page
1-1. Symbols.................................................................................................................. 1-5
1-2. Standard Equipment ............................................................................................... 1-7
1-3. Line Power Cord Types Available from Fluke ...................................................... 1-9
1-4. Front-Panel Features .............................................................................................. 1-10
1-5. Rear-Panel Features ............................................................................................... 1-12
1-6. Maximum Voltage and Current on Input Terminals .............................................. 1-13
1-7. Maximum Voltage and Current on Output Terminals ........................................... 1-14
1-8. Optional Accessories.............................................................................................. 1-15
2-1. Confidence Probabilities ........................................................................................ 2-3
2-2. Total Accuracy Calculation.................................................................................... 2-3
2-3. Front-Panel Indications .......................................................................................... 2-8
2-4. Status Indicators ..................................................................................................... 2-9
3-1. Power On and RST Defaults .................................................................................. 3-4
3-2. Common Command Summary............................................................................... 3-6
3-3. SCPI Commands .................................................................................................... 3-7
3-4. 6105A SCPI Commands for the 52120A............................................................... 3-8
3-5. *OPT? Bit Identification ........................................................................................ 3-12
4-1. Approved Replacement Fuses................................................................................ 4-3
4-2. Replaceable Parts ................................................................................................... 4-4
5-1. Calibration Equipment ........................................................................................... 5-3
5-2. Nominal Resistance for A40B Shunts.................................................................... 5-6
5-3. 2 Amp Range Verification ..................................................................................... 5-8
5-4. 20 Amp Range Verification Points ........................................................................ 5-10
5-5. 120 Amp Range Verification Points ...................................................................... 5-12
5-6. Burden Resistor Verification Points....................................................................... 5-13
5-7. Product Adjustment Points..................................................................................... 5-20
5-8. Test Equipment for Closed-Loop Verification....................................................... 5-22
5-9. Power Line Frequency Confidence Check Points.................................................. 5-23
5-10. Phase Angle Accuracy Confidence Check Points.................................................. 5-23
5-11. Amplitude Verification on 2 Amp Range .............................................................. 5-24
5-12. Amplitude Verification on 20 Amp Range ............................................................ 5-25
5-13. Amplitude Verification on 120 Amp Range .......................................................... 5-26
5-14. Phase Angle Verification on 2 Amp Range ........................................................... 5-26
5-15. Phase Angle Verification on 20 Amp Range ......................................................... 5-27
5-16. Phase Angle Verification on 120 Amp Range ....................................................... 5-27

52120A
Users Manual
vi

vii
List of Figures
Figure Title Page
1-1. Front-Panel View ................................................................................................... 1-10
1-2. Rear-Panel View .................................................................................................... 1-12
2-1. Connections for Reduced Common-Mode Interference ........................................ 2-5
2-2. Product Connections to a Watthour Meter............................................................. 2-7
2-3. Status Indicators ..................................................................................................... 2-9
2-4. 5520A and 52120A Connections ........................................................................... 2-11
2-5. Master to Slave Connections.................................................................................. 2-13
2-6. Two Amplifier Outputs Connected in Parallel....................................................... 2-14
2-7. Feedback Cable Connections ................................................................................. 2-15
2-8. Multiple Amplifier Connections ............................................................................ 2-16
2-9. 6105A to 6106A Connections ................................................................................ 2-18
3-1. IEEE Bus Address Switches .................................................................................. 3-3
3-2. SCPI Status Registers............................................................................................. 3-5
5-1. Test Equipment Connections ................................................................................. 5-4
5-2. Calibration Adjustment Setup ................................................................................ 5-15
5-3. Calibration Enable Switch...................................................................................... 5-16

52120A
Users Manual
viii