N4L SFRA45 User manual

SFRA45
USER MANUAL
Version2.10 November 2018

“Do not be hasty when making measurements.”
The SFRA455 is a precision instrument that provides you with the
tools to make a wide variety of measurements accurately,
reliably, and efficiently - but good metrology practice must be
observed. Take time to read this manual and familiarise yourself
with the features of the instrument in order to use it most
effectively.

SFRA45 User Manual
i
IMPORTANT SAFETY INSTRUCTIONS
This equipment is designed to comply with BSEN 61010-1
(2010) (Safety requirements for electrical equipment for
measurement, control, and laboratory use) –observe the
following precautions:
Keep the ventilation holes on the underneath and rear
free from obstruction.
Do not operate or store under conditions where
condensation may occur or where conducting debris
may enter the case.
There are no user serviceable parts inside the
instrument –do not attempt to open the instrument,
refer service to the manufacturer or his appointed
agent.
Note: Newtons4th Ltd. shall not be liable for any
consequential damages, losses, costs or expenses
arising from the use or misuse of this product
however caused.

SFRA45 User Manual
ii
DECLARATION OF CONFORMITY
We declare that the product:
Description: Sweep Frequency Response Analyser
Model: SFRA45
Conforms to the EEC Directives:
2014/30/EU relating to electromagnetic compatibility:
EN 61326-1:2013
2014/35/EU relating to Low Voltage Directive:
EN 61010-2-030:2010:
IP Protection of Inputs and Outputs: IP 30 –CEI EN
60529
Operating Temperature: -5⁰to 50⁰C
Storage Temperature: -10⁰to 60⁰C
Relative Humidity Range: 20-90% Non Condensing
Max Altitude: 2,000 Metres
Stuart Chappell
(Director Newtons4th Ltd.)

SFRA45 User Manual
iii
WARRANTY
This product is guaranteed to be free from defects in
materials and workmanship for a period of 36 months from
the date of purchase.
In the unlikely event of any problem within this guarantee
period, first contact Newtons4th Ltd. or your local
representative, to give a description of the problem. Please
have as much relevant information to hand as possible –
particularly the serial number and release numbers (press
SYSTEM then LEFT).
If the problem cannot be resolved directly then you will be
given an RMA number and asked to return the unit. The
unit will be repaired or replaced at the sole discretion of
Newtons4th Ltd.
This guarantee is limited to the cost of the instrument
itself and does not extend to any consequential damage or
losses whatsoever including, but not limited to, any loss of
earnings arising from a failure of the product or software.
In the event of any problem with the instrument outside of
the guarantee period, Newtons4th Ltd. offers a full repair
and re-calibration service –contact your local
representative. It is recommended that the instrument be
re-calibrated annually.

SFRA45 User Manual
iv
ABOUT THIS MANUAL
This manual describes the general features, usage and
specifications of the SFRA45 (Sweep Frequency Response
Analyzer)
Detailed descriptions of the communications command set
for RS232, USB and LAN is given in the separate manual
“SFRA45”communications manual”.
Version 2.1 5th November 2018
This manual is copyright © 2006 - 2018 Newtons4th Ltd.
and all rights are reserved. No part may be copied or
reproduced in any form without prior written consent.

SFRA45 User Manual
v
CONTENTS
1Introduction –general principles of operation ........ 1-1
2SAFETY ............................................................. 2-1
3Getting started .................................................. 3-1
4Quick Start guide ............................................... 4-1
4.1 Operating Mode Keys............................................... 4-1
4.2 Menu Control Keys .................................................. 4-2
4.3 Display Control Keys ............................................... 4-3
4.4 Setup Keys/Keypad ................................................. 4-4
4.5 Control Keys........................................................... 4-5
4.6 Data Entry Guide .................................................... 4-6
4.7 Power Transformer Mode ......................................... 4-6
5Using the menus ................................................ 5-1
5.1 Selection from a list ................................................ 5-3
5.2 Numeric data entry ................................................. 5-4
6Special functions ................................................ 6-1
6.1 Display zoom.......................................................... 6-1
6.2 PROG –non volatile memory store and recall ............. 6-1
6.3 Zero Compensation ................................................. 6-3
6.4 Using Remote Control .............................................. 6-5
6.5 Standard event status register.................................. 6-7
6.6 Serial Poll status byte .............................................. 6-8
6.7 RS232 connections.................................................. 6-9
6.8 RS232 printer ....................................................... 6-10
7System options .................................................. 7-1
7.1 User data ............................................................... 7-2
8Setup / Key Functions......................................... 8-1
8.1 Acquisition Mode (ACQU) ......................................... 8-1
8.2 Sweep Mode / Key (SWEEP) ..................................... 8-3
8.3 Trim mode (TRIM)................................................... 8-6
8.4 Comms Key (COMMS) ............................................. 8-7
8.5 DUT Key ................................................................ 8-7

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8.6 AUX KEY ................................................................ 8-9
8.7 OUTPUT KEY......................................................... 8-10
8.8 Input Channels ..................................................... 8-11
8.9 System Key Functions ........................................... 8-14
8.10 Prog Key Functions................................................ 8-17
8.11 Storing Results ..................................................... 8-18
8.12 Recalling Results................................................... 8-20
8.13 Deleting Results.................................................... 8-20
8.14 Memory Status ..................................................... 8-22
9Frequency Response Analyzer.............................. 9-1
9.1 (FRA) Screen Display Areas ...................................... 9-5
10 Impedance Mode.............................................. 10-1
10.1 (LCR) Screen Display Areas.................................... 10-2
11 AC RMS Mode .................................................. 11-1
12 Oscilloscope Mode. ........................................... 12-1
13 Technical Specifications .................................... 13-1
14 Appendix A –Text File Format ........................... 13-2
14.1 Example Text File.................................................. 14-2
14.2 Text File Header Format Explanation ....................... 14-3
14.3 Text File Example Sweep Data................................ 14-4
Appendix A –Contact details................................... 14-6

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APPENDICES
Appendix A Accessories
Appendix B Serial command summary
Appendix C Available character set
Appendix D Configurable parameters
Appendix E Contact details

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1-1
1Introduction –General principles of operation
The SFRA45 Selective Level Meter is designed to provide a
single instrument solution for multiple applications in the
Power Transformer industry and specifically the Power
Testing Systems environment. Features include:
AC RMS Voltmeter
Signal Generator
Frequency Response Analyzer
LCR Meter-Inductance, Capacitance, Resistance
Measurement
Oscilloscope
The SFRA45 has a wide bandwidth generator output that
can be used as a signal generator for sine, square or
triangular waveforms.
The SFRA45 has two high bandwidth voltage inputs, which
use direct digital analysis at low frequencies and a
heterodyning technique to give high accuracy at high
frequencies. The voltage inputs are simultaneously
sampled and the data is analysed in real time by high
speed DSPs (digital signal processors). A separate CPU
(central processing unit) takes the DSP results for display
and communications. At the heart of the system is an
FPGA (field programmable gate array) that interfaces the
various elements.
The whole operation of the instrument may be controlled
remotely via a serial interface (RS232/USB), or a LAN
Interface. The programmable nature of the instrument
means that new functions can be added as they become
available, or existing functions can be enhanced, by simple
firmware download.
Both the input channels are calibrated digitally so there
are no physical adjustments to be made.

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2SAFETY
READ THIS GUIDE AND SAFETY INFORMATION
BEFORE USING THE INSTRUMENT.
Only use the instrument under the conditions and
purpose for which it is intended.
Ensure that the AC supply Voltage and the power pack
supplied are at the same ratings. AC operation is
intended for indoor use only.
This instrument is NOT “field”repairable. Return the
unit to Newtons4th Ltd for repair or replacement.
The instrument is NOT waterproof or airtight. Return to
the factory for evaluation if exposed to abnormal
environmental conditions.
Do not operate or store under conditions where
condensation may occur or where conducting debris
may enter the case.
Keep the ventilation holes on the top and bottom ends
of the instrument clear.
NOTE: Operators should follow all standard and specific
company safety procedures when using this product and
accessories. Special precautions must be adhered to
when working with or around antennas, power lines,
radio frequency sources, etc. FAILURE TO COMPLY
WITH SAFETY RULES MAY RESULT IN INJURY OR
DEATH.

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3-1
3Getting started
The SFRA45 is supplied ready to use –it comes complete
with an appropriate power lead and a set of test leads. It
is supplied calibrated and does not require anything to be
done by the user before it can be put into service.
The instrument is housed in a rugged aluminium case and
is provided with various accessories together as shown
above.
N4L Bushing
Clamps
SFRA45
Instrument
Aluminium
Carry Case
2x Earth Clamps and
5m Earth braids
Instrument
2GB Memory
Stick
3x 18m BNC
Integrated Cable
Reel

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3-2
Further Features Include:
Up to 1000 analyzer setups, readings and sweep
results can be stored
On board real time clock
6 digit freq, 5 digit volts and 4 digit dBm resolution
Operational temperature range -5 to +50°C
1GB internal flash storage and ports. Many of the
instrument test functions will provide the user with
valuable information. Therefore 1 Gigabyte of
memory, an external USB port and an RJ45 input
connection for laptop connectivity provides a
versatile solution for storage and communication.
5.7” Colour
Display to
maximize
Visibility in
all
conditions
Weight
2.7 Kgs
~5 lbs
Operates from an
internal
rechargeable
Lithium Ion
Battery, an AC/DC
Power Source or
an external 12V
Vehicle Battery
Tablet Style
Dimensions
12” x 9” x 1.75”
305mm x 230mm
x 45mm
Rugged
metal casing
ideal for field
use

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3-3
The instrument can be powered by multiple sources;
directly from the AC/DC Adapter, from the internal battery
source (Lithium polymer batteries) or directly through the
DC input, (9-18V @ 3A source required). The instrument
is shipped with a 6-metre power adapter lead that permits
use through a vehicle DC source outlet socket.
AC/DC Adapter –The AC/DC adapter can accept a wide
AC input range (100 to 240Vac). Adapter plugs are
available to accommodate the various country standards.
Battery Power –The instrument is shipped with a battery
source consisting of (3) lithium polymer rechargeable
batteries.
DC Input –The instrument is supplied with a 6-metre
vehicle power adaptor lead. The vehicle DC source outlet
socket can then be used to power and charge the
instrument. The DC input will operate with a 9-18V dc
source at 3A; however, the equipment warranty does not
cover any damage caused by any other source than the
ones provided with this instrument.
Charging the batteries –The instrument has a
sophisticated battery monitoring and charging system,
providing the user with a battery status indication. When
running on battery power, the monitor goes from green to
orange to red, indicating the state of the batteries. The
instrument will beep and a prompt on the screen appears
when power levels are at a stage when data or set-up
information should be stored. When receiving the
instrument it is recommended that the batteries are first
charged and fully discharged two or three times to help
extend battery life. Finally, fully charge the batteries
before using the instrument.
The system provides the following indications while the
batteries are charging:

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When charging - blue with >>>>.
When finished charging, but power connected- blank.
If batteries get too hot, charging is suspended - red
with XXXX
Changing the batteries - Only qualified personnel,
trained and knowledgeable in electronic instrument repair
and safety, having read this guide should attempt to
change the batteries.
Disconnect the instrument from all external power sources.
Remove the four (4) hex bolts from the sides of the
instrument housing (2 on each side).
NOTE: Proper anti-static precautions should be used when
opening the instrument, such as a grounding strap.
Note the position and location of all ribbon cables.
Disconnect ribbon cables as necessary to securely rest the
instrument cover face down. Cut the tie-wraps holding the
batteries in and remove all of the old batteries. NOTE: All
three batteries should be replaced at the same time. Make
sure disposal of the used batteries is in accordance with
the local country regulations. Make sure the batteries are
first charged and fully discharged two or three times to
help extend battery life. Then finally fully charge the new
batteries before using the instrument.
Communications –The instrument has communication
interface ports supporting USB, RS232 and LAN options

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Communication and Power Panel
12v
Power
Inlet
Ventilation
fan
LAN
RS232
USB
USB Port
(Memory
Stick)
Power
Button

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3-6
Getting started with Initial Signal Capture
This may be the first time the instrument has been
operated and therefore the user may not be familiar with
the initial setup. This section provides guidance in order to
capture signals which are unknown in amplitude.
Switch on the SFRA45 unit. The display should
illuminate with the model name and the firmware
version for a few seconds while it performs initial
tests. It should then default to the Frequency
Response Analyzer (FRA) display.
Select the RMS mode by pressing the “RMS” button
Give the unit two minutes to warm up and then press
the “ZERO” button
Connect the output lead of the output BNC to CH1
and CH2 inputs.
Press the OUT key to call up the output menu and set
the output to ON. Set the output amplitude to 2V.
Exit the menu by pressing the ENTER button or the
HOME Button twice.
The display should indicate an RMS value of around
470mV (Input Impedance set to 50 Ohms)
Press the “FRA” key to select the frequency response
and check the gain reads 0.000dB ±0.010dB, and
that the phase reads 0.000˚ ±0.010˚
In the event of any problem with this procedure, please
contact customer services at Newtons4th Ltd. or your local
authorised representative: contact addresses and
telephone numbers are given in the appendix at the back
of this manual.

SFRA45 User Manual
4-1
4Quick Start guide
4.1 Operating Mode Keys
The operating Mode Keys: FRA, LCR, RMS, SCOPE allow
direct access to the main operating modes of the
instrument
FRA –Frequency Response Analyzer - Selects the
Frequency Response Analyzer Mode.
LCR –Impedance Analyzer - Selects the Impedance
Analyzer Mode.
RMS –AC RMS - Selects the AC RMS Mode.
Scope –Scope Mode
The factory default setting is the FRA Mode.
Press the operating mode key “FRA” etc a second time, or
press the “MODE” key, to access mode-specific options

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4.2 Menu Control Keys
ENTER/NEXT confirms your selection or parameter
value/data entry.
HOME/ESC returns to the original entry or to your
previous action.
DELETE/BACK removes a previous selection or value,
or returns to your previous action.
ARROW KEYS (Up, Down, L, R) to move around menu
options, make incremental/decremental changes etc.
Also to position cursors in SCOPE mode.

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4-3
4.3 Display Control Keys
Display Zoom
a. Return to no zoom by pressing ZOOM–
b. Press ZOOM+ to zoom in
Real time
Toggles between continuous display readings and
Table graphs.
Table, Graph
Select tabular or graphical presentation of sweep data