.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;} .ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;} .ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;} .ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;} .ut-cat p{margin:.6em 0;} .ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;} .ut-cat img{max-width:100%;height:auto;} .ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;} .ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;} .ut-cat td strong{color:#222;} Overview The UT503PV is built for solar work: it measures insulation resistance on live photovoltaic systems at up to DC 1000 V, so a string can be tested without taking the array offline or short-circuiting panels — including after dark. It tests to IEC 62446 with test voltages from 125 V to 1000 V and a measurement range up to 4000 MΩ, and it's rated CAT II 1000 V / CAT III 600 V with an IP54 sealed body for outdoor use. Stepped-voltage testing, a comparison function, automatic discharge, and a high-voltage alarm cover the safety and diagnostic basics, while 1000 result sets store on-board and transfer over USB or a Bluetooth app for commissioning reports. It's backed by UNI-T's nearly 40 years of test-meter manufacturing. Key Features Live PV insulation testing up to DC 1000 V — no array shutdown required Test voltages: 125 V, 250 V, 500 V, 1000 V (IEC 62446) Insulation resistance up to 4000 MΩ, accuracy ±(1.5%+5) Stepped-voltage testing and comparison function Automatic discharge and high-voltage alarm 1000-set storage; USB and Bluetooth app CAT II 1000 V / CAT III 600 V; IP54 sealed body Compact ~0.5 kg handheld for rooftop and field work UT503PV Details Live PV Insulation Testing The UT503PV measures insulation resistance on energized photovoltaic strings up to DC 1000 V, so you can verify a system without disconnecting it or short-circuiting panels — and because it doesn't depend on irradiance, testing works after dark when the array is at a stable voltage. Built to IEC 62446 Test voltages from 125 V to 1000 V and a 4000 MΩ range follow the IEC 62446 framework for commissioning and periodic verification of PV installations, giving a documented insulation result for sign-off. Safety for High-Voltage DC Automatic discharge clears stored charge after each test, a high-voltage alarm warns of live leads, and the CAT II 1000 V / CAT III 600 V rating with an IP54 sealed body suits outdoor rooftop and ground-mount work in the field. Documentation & Connectivity Store up to 1000 result sets and transfer them by USB or a Bluetooth app, with a comparison function for pass/fail thresholds — practical for commissioning packs and recurring maintenance records. Applications Solar PV installation and commissioning to IEC 62446; periodic insulation checks on operating arrays; EV-charging and battery-energy-storage DC wiring verification; and rooftop and ground-mount maintenance where live testing avoids taking a system offline. Frequently Asked Questions Can the UT503PV test energized PV systems? Yes — it measures insulation resistance on live PV strings up to DC 1000 V, so the array does not have to be shut down or short-circuited. Can it test at night? Yes. Because the measurement does not rely on irradiance, testing works after dark when the string is at a stable voltage. What standard does it follow? Test voltages and ranges follow IEC 62446 for photovoltaic system commissioning and verification. Specifications Test Voltages 125 V / 250 V / 500 V / 1000 V Insulation Resistance up to 4000 MΩ IR Accuracy ±(1.5% + 5) PV Insulation Resistance (live) up to 4000 MΩ, ≤ DC 1000 V DC Voltage 5 to 1000 V, ±(1% + 4) AC Voltage 5 to 600 V, ±(1% + 4) Short-Circuit Current < 1.5 mA (IR) / < 1.2 mA (PV IR) Stepping Voltage Yes Auto Discharge Yes Compare Function Yes High Voltage Alarm Yes Data Storage 1000 sets Data Communication USB + Bluetooth app Safety Rating CAT II 1000 V, CAT III 600 V IP Rating IP54 (cap closed) Dimensions (L × D × H) 161 × 117.3 × 63 mm Weight ≈0.5 kg Documentation UT503PV Datasheet UT503PV User Manual
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