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<p class="MsoNormal"><span style="font-size:11.0pt">Dear Ce Chen, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m sorry for the issues. I’ll try to help you resolve them as quickly as possible.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Here are my initial questions:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">In the software, in the top left corner, please confirm whether the ‘Set ADC Parameters’ interface checkbox was checked, the user interface was opened,
and then closed again to initialize these parameters prior to data acquisition. If it was not, this might explain why you hear the clicking sound when the transistor controls were toggled but are reading back irradiance and ozone values of zero. This is my
current best guess as to what the issue could be, but let’s see. <o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Please send me a photo of the front panel of the PAM electronics box – I’d like to check that the toggle switches next to the “O3 Lamp”, “PAMLamps1”,
and “PAMLamps2” connectors are in the “ON” positions. <o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">If needed, I’ll follow up with suggested next steps after I receive your response.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Andy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
</span><span style="font-size:11.0pt;font-family:"Microsoft JhengHei",sans-serif">陈策</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <chencejerry@stu.pku.edu.cn>
<br>
<b>Sent:</b> Saturday, September 20, 2025 4:55 AM<br>
<b>To:</b> Andy Lambe <lambe@aerodyne.com><br>
<b>Cc:</b> songhuan199510 <songhuan199510@gmail.com><br>
<b>Subject:</b> Questions about PAM chamber in using from PKU Lu group<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Respected Dr. Andy Lamber,</span><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">I am Ce Chen, the Ph.D. student in the Keding Lu group from Peking University. Recently, I have some questions about the PAM chamber (OFR) in using and I will
be very appreciate for your help. We are unable to use the Mode 185 and Mode 254 and the following is a detailed description of the problem and the steps we have alraedy taken.<br>
<br>
</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">The mercury lamp does not light up in both Moed 185 and 254, and consequently, our external ozone monitor detects no ozone production. We have tried operating
the lamp in Mode 185 or 254 at various voltages (2V, 3V, 5V, 8V, 10V). Although the software interface indicates that the voltage is being applied correctly, but the lamp was not on. The system was functioning perfectly in previous experiments, with the lamp
turend on normally and the ozone monitor showing clear readings.</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Earlier today, while the AO1(Q1) was set to off and the voltage as 0 V but the main PAM was not completely powered off, we disconnected and then reconnected
the power cable to the mercury lamp (185 nm) The problem occurred immediately after this reconnection. We did not perform any additional operations on the 254 lamps, while they could not light up, too.</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">We have investigated some possible faults, but still could not solve the problem of not being able to turn on the lights. In the PAM Controls software, toggle
the transistor controls on/off and we can hear a clicking sound. Could you please advise on what the most likely cause of this problem might be? And if there is any further diagnostic steps we can take to identify the issue?</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">If this is indeed a hardware problem, could you please provide us with the contact information for your authorized technical support or service provider within
China? We would like to request a repair or replacement as soon as possible.</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Thank you for your prompt attention to this matter. We look forward to your guidance.</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><img width="488" height="274" style="width:5.0833in;height:2.8541in" id="_x0000_i1027" src="cid:image001.png@01DC2BA0.77AB29A0"><img width="161" height="284" style="width:1.6736in;height:2.9583in" id="Picture_x0020_2" src="cid:image002.png@01DC2BA0.77AB29A0"></span><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><o:p></o:p></span></p>
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<p><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Kind regards,</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p style="font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Ce Chen, Ph.D. Student</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p style="font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">College of Environmental Sciences and Engineering, Peking University</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p style="font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">State Key Joint Laboratory of Environment Simulation and Pollution Control</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p style="font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Peking University, Beijing, China 100871</span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p style="font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Email:
<a href="mailto:2501112402@stu.pku.edu.cn">2501112402@stu.pku.edu.cn</a></span><span style="font-size:10.5pt;font-family:SimSun;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Times New Roman",serif;color:black">Tel: (+86) 159-5873-3595</span><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><br>
<br>
</span><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><img border="0" width="1" height="1" style="width:.0069in;height:.0069in" id="_x0000_i1025" src="https://tr.qiye.163.com/datacapture/mailreport/v2/0a996631d7100302kunm79fe78a210589?zone=hz&to=lambe@aerodyne.com&tm=1758358498257&sign=382ba874120e6436eea57cdfb6b68bcb&from=chencejerry%40stu.pku.edu.cn&mid=AA*ALQDYJSzgw1zITEM6IKr5&ack=0&toname=lambe"></span><span style="font-size:10.5pt;font-family:"Source Han Sans",serif"><o:p></o:p></span></p>
<p><strong><span style="font-size:10.5pt;font-family:"Source Han Sans",serif;color:black;background:yellow">Caution:</span></strong><span style="font-size:10.5pt;font-family:"Source Han Sans",serif">This message originated from outside of Aerodyne. Do not follow
links or open files unless you are confident that this message is legitimate.<o:p></o:p></span></p>
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