英国ttipl303qmd/pl303qmt双输出线性直流电源
 新的pl系列高性能线性直流稳压电源，它取代了原来的pl系列已在世界各地的许多组织选择的实验室电源。新的pl系列保留原来的pl系列真实的模拟控制，但将其与新的数字为基础的方便的功能，更高的功率密度，和优越的性能。
pl303qmd不仅仅是两个pl303单组蔬菜电源，它有四种操作模式：
两组完全隔离，独立输出
两组保持隔离输出，但主输出电压控制输出相同的电压
并联输出的功率可以达到180w，电流可以提供高达6a
分离率跟踪：如上所述，但是从电压可设置为任何比例的主电压将保留百分比作为主电压的变化。
两个输出的同步控制
两/关闭按钮，除了个别的开关为每个输出，并让两个输出被打开或关闭，同时通过按下一个按钮。
输出的同步开关的电路可如果一个电压轨是目前没有其他受损的重要性日益增加。
pl303qmt是三组输出线性直流电源，pl303qmt具有相同功能的pl303qmd，但有一个完整的性能第三的输出一个低电压，高电流能力。
第三组输出可以提供0-6v分辨率为1mv，电流8a。所有的主要输出功能纳入，包括s-锁，可选遥感，和一个0.1分辨率低电流范围。
产品型号：
pl068 - 0vto6v/1ma to 8a; 0v to 6v/0.1ma to 500ma;(48wmax.)
pl155 - 0vto15v/1ma to 5a; 0v to 15v/0.1ma to 500ma;(75wmax.)
pl303 - 0vto30v/1ma to 3a; 0v to 30v/0.1ma to 500ma;(90wmax.)
pl601 - 0vto60v/1ma to 15a; 0v to 60v/0.1ma to 500ma;(90wmax.)
pl303qmd -twoidentical outputs as per pl303, with tracking and parallelmodes(seemodessection)
pl303qmt - asperpl303qmd plus third output as perpl068(above)
note:actualmaxima for voltage and current are typically 1% greater thanthefiguresgivenabove.
outputsetting&control
voltagesetting:by coarse andfinecontrols.
currentsetting:by singlelogarithmiccontrol.
outputmode:constant voltage or constant current with automaticcross-over. ccindicator inconstantcurrentmode.
outputswitch:electronic, non isolating. preset voltage and currentlimitdisplayed when output off. 
output rise time noload<15ms.
v-span (voltagespancontrol)
thevoltageadjustment range can be controlled by digital setting oftheend-stop values of the coarse voltage control to anydesiredvalues. the range for vmax is 0.1v to 6v/15v/30v/60vdepending onmodel. 
the range for vmin is 0 to (vmax-0.1v).
s-lock (settingslock)
voltageandcurrent settings can be locked by a single button press.lockaccuracy is equal to the meter accuracy (seemeterspecification).
outputperformance
ripple andnoise:normal mode voltage: <0.4mv rms and 2mv p-p; normal modecurrent:<0.2marms; (<40ua >); common mode current:<5marms
loadregulation:voltage - <0.01% + 2mv. current - typically 0.01%+500ua.
voltagespecificationapplies for any load change, measured at the outputterminals. whenusing remote sense add 0.5mv per 0.1v drop in thepositive outputlead (max. sense lead resistance0.5 ohm).
lineregulation:voltage <0.01% + 2mv for 10% line change. current <0.01% + 250ua.for10%linechange.
transientresponse:<50ms to within 50mv of setting for a 90%loadchange.
temp.coefficient:voltage: typically <(50ppm +0.5mv)/oc; current: typically <(100ppm+1ma)/oc; 
(100ppm + 0.1ma)/oc on500marange.
outputprotection
outputprotection:output will withstand forward voltages of up to 20vabove ratedoutput voltage. reverse protection by diode clamp forcurrents upto3a.
over-temperature:outputtrips offforover-temperature.
safetyinterlocks:operations that could cause an unpredictable change involtage orcurrent settings are interlocked with theoutputswitch.
outputconnections
outputterminals:universal 4mm safety binding posts on 19mm (075)spacing.
terminals can accept fixed shroud 4mm plugs, standard 4mmplugs,fork terminals andbarewires.
remotesense
senseselection:voltage sensing can be selected as local or remote byfrontpanelswitch.
senseterminals:sprung loadedscrew-lessterminals.
modesofoperation(pl303qmd/qmtonly)
the pl303qmd and pl303qmt havefourmodes of operation - independent, isolated tracking, isolatedratiotracking, and true parallel.
independent: thetwooutputs are completely independent and electrically isolatedfromeachother.
tracking: thetwooutputs remain electrically isolated, but the voltage controlofthe master output sets an identical voltage on theslaveoutput.
ratiotracking: astracking, but the slave voltage can be set toto any percentage ofthe master output and will retain thatpercentage ratio as themaster voltageisvaried.
parallel: all ofthepower (up to 180 watts) is channelled to the master outputwhichcan consequently supply up to 6 amps. the slave output isturnedoff and its metersareblanked.
both on/bothoff: theboth on and both off buttons are in addition tothe individualswitches for each output, and allow both outputs tobe turned on oroff synchronously by a singlebuttonpress.
meterspecifications
displaytype:dual 4-digit meters, 10mm(039)led.
voltagemeter
resolution:10mv; accuracy:+/-(0.1% of reading+10mv)
currentmeter
resolution:1ma(0.1ma on 500ma range); accuracy: +/-(0.3% + 0.005a) to 3a; +/-(05%+0.005a) to 5a; 
+/-(03% + 0.5ma) on500marange
meterdamping:normally 20ms, switchable to 2 sec for averaging of rapidlyvaryingloads.
general
ac input: 230vacor 115v ac +/-10%, 50/60hz. installation category ii; input power:280/560/840vamax.
operatingrange:+5oc to +40oc, 20% to80%rh
storagerange:-40oc to+70oc
environmental:indooruse at altitudes up to 2000m, pollutiondegree2.
cooling:intelligentvariable-speed low noise fanassistsconvection.
safety:complieswithen61010-1
emc:complieswithen61326
size: single-107mm wide x 131mm high ( rack 3u) x 288mm deep, excludingfeet,knobs and terminals;
dual - 214mm wide x 131mm high ( rack 3u) x 288mm deep,excludingfeet, knobs and terminals.
triple - 321mm wide x 131mm high ( rack 3u) x 288mm deep,excludingfeet, knobsandterminals.
weight: single-45kg; dual - 8.5kg,triple12.8kg

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