Newtons4th LPA05A User manual

LPA05 User Guide
Specification
Parameter
LPA05A
LPA05B
Units
Input connector
isolated BNC
Input impedance
10k

Peak operational input voltage
4
1.6
V
Maximum safe input voltage
15
V
Peak withstand input voltage
30
V
Input common mode range
40
V
Input offset voltage
1
mV (typ)
5
mV (max)
Full power bandwidth
1M
@40V pk-pk
1M
@36V pk-pk
Hz
250k
@80V pk-pk
Hz
Small signal bandwidth (-3dB)
3M @2V pk-pk
Hz
Coupling
Ac, ac+dc, ac+(dc)
Gain
X10
Output connectors
isolated BNC
isolated 4mm
Peak output voltage
40
16
V
Maximum safe output level
90
VA
Slew rate
120
V/us
Maximum ac output current
(>10Hz)
3
5
A rms
5
8
A pk
Maximum dc output current
2
4
A dc
Temperature range
0 - 40
C
Size
30 x 15 x 25
cm
Weight (approx)
6
Kg
Power source
90-265
V
45-63
Hz
Power consumption (max)
150
VA (max)
Notes:
All specifications are typical values unless otherwise stated.
Specifications are valid after 30 minutes warm up.
LPA05 User Guide
LPA05
High frequency, high power, dc accurate, power amplifier
for laboratory and industrial applications.
Description
LPA05 is a wideband power amplifier with 40V peak voltage output
at 3A rms from dc to 500kHz. At lower output levels, the gain
extends beyond 1MHz. It uses an innovative balanced high
frequency design to give a slew rate of greater than 120V/us, while
maintaining dc accuracy and high reliability.
LPA05B is a higher current, lower voltage version capable of
delivering 5A rms from dc to 1MHz at 16V peak.
LPA05 is generally stable driving any load - resistive, capacitive or
inductive –but as with all high frequency amplifiers, care must be
taken when connecting to pure capacitive loads. An appropriate
resistor or inductor may be needed in series with the capacitive load
to minimise peaking in the frequency response or to prevent
spurious oscillation.
LPA05 is powered by a universal input power supply monitored by a
pair of indicators on the front panel. Internally the LPA05 is floating
from ground to minimise earth loops, but can be grounded by linking
the output 0V to earth via the 4mm connectors.
LPA05 is housed in a robust steel cabinet.
Do not obstruct the ventilation holes on the sides,
underneath or rear of the amplifier.
Newtons4th Ltd
30 Loughborough Road
Mountsorrel
Loughborough
LE12 7AT, UK
Tel [phone]
Fax [phone]
E-mail [e-mail]
Website www.newtons4th.com
Tel: [phone]
Fax: [phone]
www.caltest.de
Kohlmattstrasse 7
D-77876 KAPPELRODECK
[email protected]
Caltest Instruments GmbH

LPA05 User Guide
IMPORTANT SAFETY INSTRUCTIONS
This equipment is designed to comply with BSEN 61010-1 (Safety
requirements for electrical equipment for measurement, control, and
laboratory use) –observe the following precautions:
When continually running the LPA05A into a <5Ω impedance load
refer to Current v Load De-rating graph below. However, it is
allowable to run the unit at full current into <5Ωfor a period not
exceeding 30 seconds, otherwise overload damage may occur.
Ensure that the supply voltage agrees with the rating of the
instrument printed on the back panel before connecting the mains
cord to the supply.
This appliance must be earthed. Ensure that the instrument is
powered from a properly grounded supply outlet.
The input and output connectors, and the internal circuitry are
isolated from earth - do not exceed 40V peak common mode.
Keep all the ventilation holes on the underneath, rear, and sides
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 amplifier –do not
attempt to open the case, refer service to the manufacturer or his
appointed agent.
In the event of a failure of the mains fuse, disconnect the mains
cord and replace the fuse with the same type and rating, as shown
on the rear of the amplifier.
Switch off the amplifier and ensure the output current has fallen to
zero before disconnecting an inductive load from the output.
We recommend that after running the amplifier at high power for a
period of time disconnect the load, letting the fan run for 10 minutes
to remove any latent heat build up within the unit.
LPA05 User Guide
Quick User Guide
In the following text we describe the use of the LPA05, including
details on the Coupling and bandwidth settings.
Input: The LPA05A features an input impedance of 10kOhms; this
should be considered when using function generators designed for
50Ohm load impedance.
Nominal Gain: The nominal gain of the amplifier is x10
Coupling:
AC + (DC) –This coupling setting will amplify the AC signal at the
input of the amplifier by x10 and simply pass (x1 gain) any DC input
signal.
Example:
Input signal: 1V AC @ 10 kHz + 500mV DC offset
Output Signal: from amplifier: 10V AC @ 10 kHz + 500mV DC offset
AC –This coupling setting will amplify the AC signal at the input of
the amplifier by x10 and attenuate the DC.
AC + DC –AC+DC coupling will amplify both the AC and the DC
components of the input signal.
Example:
Input signal: 500mV AC @ 10 kHz + 500mV DC offset
Output Signal: from amplifier: 5V AC @ 10 kHz + 5V DC offset
Bandwidth:
There are two options for the bandwidth on the LPA05
Low: -3dB @ 85 kHz
High: -3dB @ 1MHz

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. 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 LPA05 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.
In the event of any problem with the equipment outside of the
guarantee period, Newtons4th Ltd. offers a full repair service –
contact your local representative.
The LPA05 does not require any calibration.
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.
Declaration of Conformity
We, Newtons4th Ltd, declare that the product LPA05 conforms to
the requirements of Council Directives:
89/336/EEC relating to electromagnetic compatibility:
EN 55022 Class A
73/23/EEC relating to safety of laboratory equipment:
EN 61010-1
November 2005
Eur Ing Allan Winsor BSc CEng MIEE
(Director of Newtons4th Ltd)