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How to use the Agilent N67xxA Modular

Power System to replace an Agilent 662xA

662xA to N67xxA MPS Conversion Guide

Application Note 1467

Agilent Technologies

This application note provides a

high-level overview of the differ-

ences between the Agilent 662xA

and the Agilent N67xxA in order to

help current 662xA owners easily

convert from their Agilent 662xA to

an Agilent N67xxA. This application

note has been designed to be

used in conjunction with the

Agilent 662xA Operation Manuals

and datasheets as well as the

Agilent N67xxA User’s Guide and

data-sheets

. This is not a replace-

ment for any of the manuals and

it is recommended that a copy of

all the documentation mentioned

above be handy for reference

when reading this document.

Three areas will be discussed

in this document: electrical,

programming/interfacing, and

mechanical. These sections will

cover such topics as the power

supply’s output power and pro-

tections (electrical), command

compatibility and calibration

(programming/interfacing), as

well as size and connector type

(mechanical).

A side-by-side comparison of

the specifications and other

relevant information has been

provided in Appendix A for

convenience.

Throughout this document…

• “N6700A” refers to only

the N6700A mainframe.

• “N672xA” refers to only the

N67xxA models that have

been specifically configured

to replace the 662xA.

• “N67xxA MPS” refers to

the entire N67xxA family

of products.

• “N675xA” refers to the

N6751A (50 W) and N6752A

(100 W) High Performance

output modules.

• “N676xA” refers to the

N6761A (50 W) and N6762A

(100 W) Precision output

modules.

• “N67xxA Module” refers to

the features and characteris-

tics of the N6751A, N6752A,

N6761A, and N6762A output

modules.

• “662xA” refers to the features

and characteristics of the

6621A—6629A models.

• “40 W/80 W High/Low Voltage

Outputs” refers to the

features and characteristics

of the specified (40 W and/or

80 W) output(s), which are

only present in the 6621A,

6622A, 6623A, 6624A, and

6627A models.

• “25 W/50 W Precision Outputs”

refers to the features and

characteristics of the specified

(25 W and/or 50 W) output(s),

which are only present in the

6625A, 6626A, 6628A, and

6629A models.

Introduction

Please refer to the References section at

the end of this document for information

on these documents.

Summary of content (20 pages)

PAGE 1
How to use the Agilent N67xxA Modular Power System to replace an Agilent 662xA 662xA to N67xxA MPS Conversion Guide Application Note 1467 Introduction This application note provides a high-level overview of the differences between the Agilent 662xA and the Agilent N67xxA in order to help current 662xA owners easily convert from their Agilent 662xA to an Agilent N67xxA.
PAGE 2
The N67xxA Modular Power System (MPS) Model Selection The N67xxA MPS is a modulebased power system that consists of a mainframe (N6700A) and modules (N673xA—N676xA)2. Up to four output modules can be installed in each Agilent N6700A mainframe. Table 1 below indicates how the 662xA power supplies map over to the preconfigured N672xA power supplies. The N672xA voltage, current, and power ratings are a superset of the 662xA.
PAGE 3
Option and Accessory Selection The N672xA (N6721A—N6729A only) do not have any options associated with them. Some features that were options on the 662xA are now standard on the N6700A. Table 2 at right provides a list of options for the 662xA and how they correspond to the N672xA. Some options are only partially replaced, meaning some, but not all, of the features provided in the 662xA options are provided in the standard N672xA.
PAGE 4
Option 750, External Relay Control and RI/DFI (RI latches) The 662xA with Option 750 has an 8-pin port dedicated to the control of up to four external relays and a 4-pin port dedicated to RI/DFI. The N6700A mainframe comes standard (no option required) with a 4-pin port that is user programmable to one of three functions— RI/DFI, digital I/O, or triggering. Digital I/O and triggering are not available in the 662xA.
PAGE 5
Electrical Since you are considering a transition to a new power supply, you may want to take advantage of some of the new features/options by considering something other than an N672xA replacement model. Please see the N67xxA User’s Guide and datasheet for a complete list of features and options available in an N67xxA MPS. Safety Certification 662xA: These products are Safety Class 1 instruments.
PAGE 6
On the N67xxA models, the OV trip point can be programmed up to 60 V on all 50 W and 100 W output modules. When overvoltage protection is enabled, the power supply will turn off its output if the output voltage reaches the programmed overvoltage limit. The voltage is measured at the output terminals. There is no SCR crowbar nor is there a fixed overvoltage threshold in any of the N67xxA models.
PAGE 7
Current Sink (Downprogramming) Capability • 40 W/80 W High/Low Voltage Outputs current sink limits are fixed approximately 10% higher than the maximum current source limits for a given operating voltage at any voltage above 2.5 V. • 25 W Precision Outputs can sink up to 0.5 A. • 50 W Precision Outputs can sink 1 A above 16 V and 2 A below 16 V. • All 662xA Outputs, when the negative current limit is reached, go into –CC mode and the –CC status bit is set. • N67xxA: Current sink is limited by power.
PAGE 8
Programming/Interfacing Transient Response The 662xA uses unique commands that do not follow the SCPI (Standard Commands for Programmable Instruments) standard. These commands (compatibility commands) have been built into the N6700A’s firmware to provide backwards compatibility and convenience. The N672xA preconfigured models are capable of accepting both compatibility and SCPI commands. However, mixing commands may produce unexpected results.
PAGE 9
Interfaces Remote (GPIB) The 662xA comes standard with a GPIB interface. The N6700A mainframe also comes standard with a GPIB interface (LAN and USB are also standard on the N6700A). The ability to lock the front panel, such as the 662xA did when in remote mode, is not automatic in the N6700A. The command “SYSTem:COMMunicate:RLState RWLock” must be used to lock out the front panel. Please see the N67xxA User’s Guide for more details.
PAGE 10
N67xxA: Readback will not return any information and errors, such as -410,“Query INTERRUPTED” and -420, “Query UNTERMINATED” will be reported. Multiple, SemicolonSeparated Queries The 662xA overwrites any previous unread query responses. The N6700A, however, can respond to multiple queries. Example: VOUT? 1; VOUT? 2; VOUT? 3 662xA: Readback returns only the information for the last (VOUT? 3) query. N6700A: Readback returns values for all the queries, separated by semicolons.
PAGE 11
Status Reporting Status, Accumulated Status, Mask, and Fault Registers Table 5 below lists the bit assignments for the Status, Accumulated Status, Mask, and Fault Registers and how they translate between the 662xA and the N67xxA. The “-CC” bit will never be set because negative current cannot be regulated in the N67xxA modules6. Please see Current Sink Capabilities in the Electrical Section for more details.
PAGE 12
N675xA: The automatic setting adjustment done in the 662xA when the range changes will not occur because it is no longer necessary due to the autoranging capability of the N675xA. Since there is no range switching, the “coupled parameter” (CP) bit is never set. Range Programming 25 W and 50 W Precision Outputs: The range can be set by using the “VRSET” or “IRSET” commands. The power supply will automatically pick the range that the value sent fits into.
PAGE 13
6625A, 6626A, 6628A, 6629A: These models have 11 internal registers, which have the following characteristics: • Register 0 is recalled automatically at power-on. • Register 0 stores: VSET, VRSET, ISET, IRSET, OVSET, OCP, DLY, and MASK for all outputs. • Registers 1-10 save: VSET, VRSET, ISET, IRSET, and OVSET for all outputs. • At power-on, registers 4-10 are reset to 0 V and minimum current. • Registers 0-3 can only be saved once per power-on.
PAGE 14
Mechanical/Physical Size The overall physical size of the N6700A mainframe is much smaller than the 662xA power supply. Please see Table 8 at right. Positive deltas indicate smaller or lighter. Color The 662xA’s front panel color was Mint Gray prior to 1988 and Parchment White from 1988 to the present. The case color was French Gray prior to 1988 and Dove Gray from 1988 to the present. The N6700A’s front panel color is Quartz Grey and the case is unpainted, zinc-plated steel.
PAGE 15
rails are neither required nor available to rack mount an N6700A mainframe. The N6700A can only be rack mounted using Option 908 (p/n N6700-60009). No other means of rack mounting should be used due to airflow and height restrictions. For more information please see the Installing the Unit section in the Installation chapter of the N67xxA User’s Guide. Output Connectors Pin-outs The 662xA series output connector is a 6-pin terminal block that consists of +S, +V, -V, -S, +OV, and -OV.
PAGE 16
Appendix A 662xA to N672xA Comparison Sheet Current Model Specifications (at 0° to 55°C unless otherwise specified) 40 W Low Voltage Output 40 W High Voltage Output 80 W Low Voltage Output 80 W High Voltage Output 25 W Precision Output 50 W Precision Output Output Power Low range volts, amps High range volts, amps 0 to 7 V, 0 to 5 A 0 to 20 V 0 to 2 A 0 to 20 V, 0 to 2 A 0 to 50 V 0 to 0.
PAGE 17
New Enhanced Model8 Specifications (at 0° to 55°C unless otherwise specified) 50 W High Performance 100 W High Performance Autoranging DC Autoranging DC Power Module Power Module 50 W Precision DC Power Module 100 W Precision DC Power Module 0 to 50 V, 0 to 5 A 50 W 0 to 50 V, 0 to 10 A 100 W10 0 to 50 V, 0 to 1.
PAGE 18
Appendix A Rectangular Output vs. Autoranging Output Graph (50 W Comparison Graph): 40 W High and Low Voltage Output vs. 50 W N6751A High Performance Autoranging DC Power Module 60 50 W Autoranging DC Power Module 40 W Low Volt Output (high range); 40 W High Volt Output (low range) 50 Constant (Autoranging) Power Curve Volts (V) 40 40 W High Volt Output (high range) 40 W Low Volt Output (low range) 30 20 10 0 0 1 2 3 4 5 6 Amperes (A) Rectangular Output vs.
PAGE 19
FRONT Appendix B Figure 1a. 662xA Dimensions and Airflow Figure 2a. 662xA Output Connectors Figure 1b. N6700A Dimensions and Airflow Figure 2b.
PAGE 20
References Other Agilent Literature Data Sheets •662xA Performance DC Power Supplies http://www.agilent.com/find/ 662xdatasheet •N6700A Series Low-Profile Modular Power System http://www.agilent.com/find/n6700 Agilent p/n 5989-0489EN Operation Manuals and User’s Guides Agilent Technologies’ Test and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems.