Thurlby Thandar Instruments QPX1200 User Manual
QPX1200 Series
PowerFlex DC Power Supplies
INSTRUCTION MANUAL
Table of Contents
Specification 2
EMC 6
Safety 7
Installation 8
Connections 9
Initial Operation 11
Manual Operation 13
Remote Operation 20
Remote Commands 29
Maintenance 33
Note: The latest revisions of this manual, device drivers and software tools can be downloaded from:
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This manual is 48511-1400 Iss 8
1
General specifications apply for the tem per ature range 5°C to 40°C. Accuracy specifications
apply for the temperature range 18°C to 28°C after 1 hour warm-up with no load and calibration
at 23°C. Typical specifications are determined by design and are not guaranteed.
OUTPUT SPECIFICATI ONS
Voltage Range: 0V to 60V
Current Range: 0.01A to 50A
Power Range: Up to 1200W
Voltage Setting: Resolution 1mV
Current Setting: Resolution 10mA
Operating Mode: Constant voltage or constant current with automatic cross-over
Specification
Accuracy: 0.1% of setting ± 2mV
Accuracy: 0.3% of setting ± 20mA
provided that the power demanded stays within the power envelope,
see graph. Outside of this envelope the output bec om es unregulated.
CV, CI or UNREG mode indication in display.
QPX 1200
POWER ENVELOPE
Output Switch: Electronic, with ON indication.
Preset voltage and current displayed when off.
Output T erminals: Front panel safety terminals accepting 6mm wire diameter, 6mm
plugs or 8mm spades at 50 Amps max, or 4mm plugs at 30 Amps
max. Duplicate rear panel terminals.
Sensing: Switchable between local and remote. Screwless remote sense
terminals on both front and rear panels. Sense miswiring t r ip and
indication.
Ripple & Noise
(20MHz bandwidth):
Typically < 3m Vrms, <20mV pk-pk at maximum load, CV mode
2
Load Regulation: Change in output for any load change within PowerFlex envelope,
using remote sense:
Constant voltage: <0.01% ± 5mV
Line Regulation: Change in output for a 10% line change:
Constant voltage: <0.01% ± 5mV
Transient Response: <250us to within 100mV of set level for a 5% to 95% load chang e.
Output Protection: Output will withstand an applied forward voltage of up to 70V.
Reverse protection by diode clamp for reverse currents up t o 3A.
Over-voltage Protection
(OVP):
Over-current Pr otection
(OCP):
Over-temper at ure Protection: The output will be tripped off if a fault c auses the internal
Temperature Coeff icient : Typically < 100ppm /°C
METER SPECIFICATIONS
Display Ty pe: 5-digit (Volts), 4-digit (Am ps) , black-on-white b a c klit LCD.
Voltage (CI Mode and Unreg): Resolution 1mV
Current (CV Mode & Unreg): Resolution 10mA
V x A: Resolution 0·1W
V/A: Meter shows calculated nominal V/A value, t ogether with
Range 2V to 65V. Resolut ion 0.1V; accuracy: 0.2% ± 0.2V.
Response time typically 100µs.
Range 2A to 55A. Resolution 0.1A; accuracy: 0.5% ± 0.2A.
Response time typically 100ms.
temperature to rise excessively.
Accuracy: 0.1% of reading ± 2 dig its
Accuracy: 0.3% of reading ± 2 dig its
Accuracy: 0·5% ± 0·1W
uncertainty range; 5 digit resolution.
LOGIC CONTROL INPUT and OUTPUT
LOGIC IN is a rear-panel opto-isolated input that is act ivated at an input c ur r ent greater than
approximately 1mA. User can set LOGIC IN (via the keyboard) t o enable t he out put, disable the
output, or be ignored when it is activated.
LOGIC OUT is an isolated rear-panel open-collector output that will sink up to 2mA when
activated (‘switch closure’); the maximum voltage that can be applied to LOGI C O UT is 30VDC.
User can set LOGIC OUT to be ‘closed’ or ‘open’ for output enabled or disabled, current limit (CI
mode), power limit (UNREG mode), or for any fault trip.
ANALOG REMOTE CONTROL and MONITORING
Non-isolated inputs and outputs to set voltage and current limit and to m onit or actual output
voltage and current. These signals are referenced to the positive output and have a range of 0 to
10V or 0 to 5V (selectable via the keyboard).
Analogue Control Accuracy: Voltage: 0.3% ± 4mV; Current: 0.5% ± 40mA
Analogue Monitor Accuracy: Voltage: 0.3% ± 4mV; Current: 0.5% ± 40mA
KEYBOARD & ROTARY CONTRO L
All functions, including the selection and set-up of the remote control interfaces, can be set from
the keyboard. The rotary Jog control can be used to adjust output voltage and current settings in
a quasi-analogue mode.
DISPLAY FEATURES
The display is a 240 x 64 pixel transflective LCD, backlit by white LEDs; contrast is softwarecontrolled and can be adjusted from t he keyboard.
The default status display shows the VOLTS (5 digits) and AMPS (4 digits) in 10mm high
characters, plus the present output mode. At other times, for example during store or recall of
instrument set-ups, the display shows up to 6 lines of information, instructions, or prompts.
3
INTERFACES
Full digital remote control facilities are available through the RS232, LAN and USB interfaces.
Setting and readback resolutions are t he s am e as the Output and Meter specifications
respectively.
RS232: Standard 9-pin D-connector. Baud r at e 9600.
USB: Standard USB 2.0 hardware connection.
LAN: Ethernet 100/10base-T hardware connection.
GPIB (factory option): Conforming with IEEE488.1 and IEEE488.2.
LXI V1.2, Class C compliant.
Remote Command
Processing Time:
GENERAL
AC Input: 110V – 240V AC ± 10%, 50/60Hz.
Power Consumption: 1600VA max.
Operating Range: +5ºC to +40ºC, 20% to 80% RH.
Storage Range:
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.
Store/Recall: Up to 10 set-ups can be saved and recalled via the keyboard or
Safety: Complies with EN61010-1.
EMC: Complies with EN61326.
Size: 130mm H (3U) x 356mm W x 413mm D
Weight: 9.2kg
Options: 19-inch rack kit.
Typically < 100m s bet ween receiving the c om m and terminator for a
step voltage change at the instrument and t he out put voltage
beginning to change.
Installation Category II.
−40ºC to + 70ºC.
remote interfaces.
4
Performance levels achieved are detailed in the user manual.
EC Declaration of Conf ormity
We Thurlby Thandar Instruments Ltd
Glebe Road
Huntingdon
Cambridgeshire PE29 7DR
England
declare that the
QPX1200L Power Supply with GPIB option
meets the intent of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC.
Compliance was demonstrated by conformance to the following specifications which have been
listed in the Official Journal of the European Comm unit ies.
EMC
Emissions: a) EN61326-1 (2006) Radiated, Class A
b) EN61326-1 (2006) Conducted, Class A
c) EN61326-1 (2006) Har m onics, referring to EN61000-3-2 (2006)
Immunity: EN61326-1 (2006) Immunity Table 1, referring to:
a) EN61000-4-2 (2009) Electrostatic Discharg e
b) EN61000-4-3 (2006) Electromagnetic Field
c) EN61000-4-11 (2004) Voltage Interrupt
d) EN61000-4-4 (2004) Fast Transient
e) EN61000-4-5 (2006) Surge
f) EN61000-4-6 (2009) Conducted RF
Safety
EN61010-1 Installation Category II, Pollution Degree 2.
CHRIS W ILDING
TECHNICAL DIRECTOR
2 January 2013
5
This instrument has been designed to meet the requirements of the EMC Directive 2004/108/EC.
Compliance was demonstrated by meeting the test limits of the following standards:
Emissions
EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use. Test limits used were:
a) Radiated: Class A
b) Conducted: Class A
c) Harm onics: EN61000-3-2 (2006) Class A; the instrument is Class A by product category.
Immunity
EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use.
Test methods, limits and per formance achieved are shown below (requirement shown in
brackets):
a) EN61000-4-2 (2009) Electrostatic Discharge : 4k V air, 4kV contact, Perfor m anc e A (B).
EMC
b) EN61000-4-3 (2006) Electromagnetic Field:
c) EN61000-4-11 (2004) Voltage Interrupt: ½ cycle and 1 cycle, 0%: Performance B (B);
25 cycles, 70%: Performance A (C); 250 cycles, 0%: Performance B ( C) , if Function 11
set (Output status at power-up same as at last power-down), ot her wise Perf ormance C.
d) EN61000-4-4 (2004) Fast Transient, 1kV peak (AC line), 0·5kV peak ( DC Out put),
Performance B (B).
e) EN61000-4-5 (2006) Surge, 0·5kV (line t o line), 1kV (line to ground), Perfor m ance B ( B) .
f) EN61000-4-6 (2009) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output
connections <3m, therefor e not tested), Performance A (A).
According to EN61326-1 the definitions of performance criteria are:
Performance criterion A: ‘During test normal performance within the specification limits.’
Performance criterion B: ‘During t est, temporary degradation, or loss of function or
performance which is self-recovering’.
Performance criterion C: ‘During t est, temporary degradation, or loss of function or
performance which requires operator int er vention or s ystem r es et occ ur s.’
Where Performance B is stated it is because DC Output regulation, or V & I m easur ement
accuracy, m ay deviate beyond Specification limits under the test conditions. However, the
possible deviations are still small and unlikely to be a problem in practice.
Note that if operation in a high RF f ield is unavoidable it is good pract ice t o c onnect the PSU to
the target system using screened leads which have been passed (toget her) through an absorbing
ferrite sleeve fitted close to the PSU terminals.
Cautions
To ensure continued compliance with the EMC directive observe the following precautions:
3V/m, 80% AM at 1kHz, 80MHz – 1GHz: Performance B
1.4GHz to 2GHz: Performance A (A); 1V/m, 2.0GHz to 2.7GHz: Performance A (A).
minor regulation deviation at ~140MHz and ~250MHz at 3V/m.
(A) and
6
a) after opening the case for any reason ensur e that all signal and ground connections are
remade correctly and that case screws are correc t ly refitted and tightened.
b) In the event of part replacement becoming nec essary, only use components of an
identical type, see the Service Manual.
l
Safety
This power supply is a Safety Class I instrument according t o I EC classification and has been
designed to meet the requirem ents of EN61010-1 (Safety Requirements for Elect r ical Eq uipm ent
for Measurement, Control and Laborator y Use). It is an Installation Category II instrument
intended for operation f r om a nor m al single phase supply.
This instrument has been tested in accordanc e with EN61010-1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to r etain the inst r um ent in a safe condition.
This instrument has been designed f or indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% - 80% RH (non-condensing). It may occasionally be
subjected to temperatures between +5°C and –10°C without degradation of its safety. Do not
operate while condensation is present.
Use of this instrument in a manner not spec ified by these instructions may impair the safety
protection provided. Do not operate the instrum ent outside its rat ed supply voltages or
environmental range.
WARNING! THIS INSTRUMENT MUST BE EARTHED
Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the
instrument dangerous. Int entional interruption is prohibited. The protective action must not be
negated by the use of an extension cord without a protective conductor.
When the instrument is connected to its supply, terminals may be live and opening the covers or
removal of parts (except those to which access can be gained by hand) is likely to expose live
parts. The apparatus shall be disconnected from all voltage sources before it is opened for any
adjustment, replacement, m aint enance or repair.
Capacitors inside the power supply may still be charged even if the power supply has been
disconnected from all voltage sources but will be safely discharged about 10 m inut es af ter
switching off power.
Any adjustment, maintenance and repair of the opened instrument under voltage shall be
avoided as far as possible and, if inevitable, shall be carried out only by a skilled person who is
aware of the hazard involved.
If the instrument is clearly def ec t ive, has been subject to mechanical damage, excessive
moisture or chemical corrosion the safety protection may be impaired and the apparatus should
be withdrawn from use and returned for checking and repair.
Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse holders is pr ohibited.
Do not wet the instrument when cleaning it.
The following symbols are used on the instrument and in this m anual:-
Earth (ground) terminal.
mains supply OFF.
mains supply ON.
alternating current (ac)
direct current (dc)
7
Mains Operating Voltage
This instrument has a universal input range and will operate fr om a nominal 115V or 230V mains
supply without adjustment. Check that the local supply meets the AC Input requirement given in
the Specification.
Mains Lead
Connect the instrument to the AC supply using the mains lead provided. Should a mains plug be
required for a different mains outlet socket, a suitably rated and approved mains lead set should
be used which is fitted with the required wall plug and an IEC60320 C13 connector for t he
instrument end. To determine t he m inimum current rating of the lead-set for the intended AC
supply, refer to the power rating informat ion on t he equipment or in the Specification.
Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the
instrument dangerous. Int entional interruption is prohibited.
Mounting
Installation
WARNING! THIS INSTRUMENT MUST BE EARTHED.
This instrument is suitable both for bench use and rack mounting. It is delivered with feet for
bench mounting. The front feet include a tilt mechanism for optimal panel angle.
A rack kit for mounting in a 19” rack is available from the Manufacturers or their overseas agents.
Ventilation
The power supply is cooled by intelligent multi-speed fans which vent at the rear. Take care not
to restrict the air inlets at the side panels or the exit at the r ear. In rack-mount ed s ituations allow
adequate space around the instrument and/or use a fan tray for forced cooling.
8
Front Panel Connec tions
The load should be connected to the positive (red) and negat ive (black ) terminals marked
OUTPUT. The terminals accept 4m m plugs into the end (but note that 4mm plugs will only
support 32 Amps), 6mm diameter wire or plugs into the cross-hole or 8mm spade connections
(with a maximum blade width of 16mm). The wiring and connectors must be capable of
supporting the current required; for 50 Amps, 6mm
Remote sense connections to the load, if r equired, are made from the positive (+ ) and
negative (−) REMOTE SENSE terminals. Remote sense operation is select ed from the keyboard
or via a remote control interface; t he front panel REMOTE SENSE lamp is lit when remote sense
is selected. Switching off remote sense ret ur ns the instrument to local sensing at the front panel
output terminals.
2
cable is needed.
Connections
The terminal marked
is connected to the chassis and safety earth ground.
Rear Panel Connections
Output Terminals
The output and sense terminals are duplicated on the rear panel; these connections are
paralleled with their front panel equivalents.
Remote sense operation is selected from the keyboard or via a remote control interface. When
the rear panel terminals are used, remote sense should always be selected to ensure t hat output
regulation is maintained within specification.
Logic Input
LOGIC IN is connected directly to the input of an isolating opto-coupler; there is no series
resistor. The input is activated when a current greater than approximately 1mA is forced between
LOGIC IN and LOGIC COMMON. The function of LOG IC IN is set from the keyboard.
Do not force a current exceeding 25mA between the terminals. Do not apply a voltage to LOGIC
IN / LOGIC COMMON exceeding 50V with respect to
Logic Output
LOGIC OUT is the open-collector output of an opto-isolated NPN transistor that will sink up to
2mA when active (‘switch closure’). The function of LOGIC O UT is set from the keyboard.
.
The maximum operating voltage that can be applied between LOGIC O UT and LOGI C
COMMON is 30VDC.
Do not apply external voltages between the terminals exceeding 30VDC.
Analogue Control
V CONTROL and I CONTROL provide quasi-analogue control of the Output Voltage and Current
Limit respectively. The CONTRO L inputs are read 4 times per second by the A-to-D converter
and the output is set according to the s elect ed input scaling . The input scaling for both can be
set as 0 to 10 Volts or 0 to 5 Volts for m aximum output. The Analogue Control functions and
scaling are both selected from the keyboard. The COMMON return signal is referenced to the
positive output of the power supply.
Do not apply external voltages between the terminals exceeding 20VDC.
9
Pin Name
Description
Analogue Monitor
The output terminal voltage and output curr ent m ay be monitored on V MONITOR and I
MONITOR respectively. The output scaling for both is the same as that set f or V CONTROL and
I CONTROL, see previous section. The COMMON return signal is refer enced to the positive
output of the power supply.
Do not apply external voltages to these terminals.
RS232
9−pin female D−connector with pin connections as shown below. Can be connected to a
standard PC port using a fully wired 1:1 male-female cable without any cross-over connections.
1 RI
2 TXD Transmitted data from instrument
3 RXD Received data to instrument
4 CTS
5 GND Sig nal g r ound
6 RTS
7 DSR No internal connection
8 DTR
9 CD No internal connection
Passively asserted (+V through 10kΩ)
Passively asserted (+V through 10kΩ)
Signal ground is connected to instrument ground.
USB
The USB port is connected to instrument ground. It conforms with USB 2.0 (Full Speed) and
accepts a standard USB cable. The Windows plug-and-play funct ions should aut om at ically
recognise that the instrument has been c onnected. If the correct dr iver is not found, follow the
Windows on-screen prompts and install the required files from the CD supplied.
LAN
The LAN interface is designed to meet LXI ( Lan eXtensions for Inst r um entat ion) version 1. 2;
the instrument is Class C compliant. Remote cont r ol using the LAN interface is possible using a
TCP/IP Socket protocol. The instrument also contains a basic Web server which provides
information on the unit and allows it to be configur ed. Since it is possible to misconfigure the
LAN interface, making it im poss ible to com municate with the instrument over LAN, a LAN
Configuration Initialise (LCI) mechanism is pr ovided via a recessed switch on the rear panel
(marked LAN RESET) to reset t he unit t o t he factory default.
Further details are given in the Remote Operation chapt er. For more inform at ion on LX I
standards refer to www.lxistandard.org/home
GPIB – Factory Option
The GPIB signal grounds are connect ed to the instrument ground. The implemented subsets
are:
SH1 AH1 T6 L4 LEO SR1 RL2 PP1 DC1 DT0 C0 E2
10
The GPIB address is set fr om t he front panel.
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