.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 UT505B is the wider-range model in the UT505 pair: a CAT IV 600 V insulation tester and True-RMS digital multimeter in one handheld, reading insulation resistance up to 200 GΩ at test voltages from 50 V to 1000 V to IEC 61557. It adds an automatic fuse check to the combination, so the meter verifies its own current-input fuse before you rely on a reading. Insulation testing includes Polarization Index and DAR diagnostics, stepped-voltage testing, and automatic discharge; the 6000-count multimeter covers AC/DC voltage, resistance, capacitance, and frequency, with 99 result groups stored on-board. It's backed by UNI-T's nearly 40 years of test-meter manufacturing. Key Features Insulation resistance up to 200 GΩ, accuracy ±(1.5%+5) Test voltages: 50 V, 100 V, 250 V, 500 V, 1000 V (IEC 61557) True-RMS 6000-count digital multimeter built in Automatic fuse check AC/DC voltage to 600 V; capacitance, frequency, low and general resistance PI and DAR insulation diagnostics Stepped-voltage testing and automatic discharge 99-group data storage; CAT IV 600 V UT505B Details Two Instruments in One Like the UT505A, the UT505B pairs a 1000 V insulation tester with a full True-RMS multimeter, so one handheld covers insulation testing and the voltage, resistance, capacitance, and frequency measurements that go with it. Insulation Testing to 200 GΩ A 200 GΩ measurement range — ten times the UT505A — keeps high-resistance insulation on-scale, with five test voltages from 50 V to 1000 V and IEC 61557 compliance for motor, cable, and switchgear work. Automatic Fuse Check The UT505B verifies its own current-input fuse automatically, so a blown fuse can't quietly turn a current measurement into a misleading reading — a useful safeguard in daily field use. PI, DAR & Stepped Voltage Timed PI and DAR diagnostics and stepped-voltage testing reveal moisture, contamination, and marginal insulation that a single fixed-voltage reading would pass. Safety & Field Build Automatic discharge clears stored charge after each test, the CAT IV 600 V rating suits distribution work, and 99 result groups store on-board for later review. Compare the UT505 Series UT505A UT505B Max insulation resistance 20 GΩ 200 GΩ Auto fuse check — Yes Applications Combined insulation and electrical testing on motor windings, cables, and switchgear where a wider 200 GΩ range is needed; preventive maintenance with one tool for both jobs; and field troubleshooting that moves between insulation testing and routine multimeter measurements. Frequently Asked Questions How high does the UT505B measure insulation resistance? Up to 200 GΩ — ten times the range of the UT505A. What is the automatic fuse check? The meter verifies its own current-input fuse automatically, so a blown fuse won't produce a misleading current reading. Is the UT505B also a multimeter? Yes — a True-RMS 6000-count multimeter with AC/DC voltage, resistance, capacitance, and frequency, in addition to insulation testing. Specifications Test Voltages 50 V / 100 V / 250 V / 500 V / 1000 V Insulation Resistance 0.01 MΩ to 200 GΩ IR Accuracy ±(1.5% + 5) DC Voltage 0 to 600 V, ±(2% + 3) AC Voltage 0 to 600 V, ±(1.5% + 5) Frequency 45 to 1 kHz, ±(0.1% + 3) Capacitance 100 pF to 500 µF, ±(5% + 5) Low Resistance 0.01 Ω to 20 kΩ, ±(1.5% + 3) General Resistance 0.01 kΩ to 10 MΩ, ±(3% + 3) Display Count 6000 True RMS Yes PI / DAR Yes Step Voltage Yes Auto Discharge Yes Data Storage 99 groups Auto Fuse Check Yes Compliance Standard IEC 61557 Safety Rating CAT IV 600 V Power 6 × 1.5 V (LR6) Dimensions (W × H × D) 103 × 225 × 59 mm Weight 630 g Documentation UT505B Datasheet UT505B User Manual
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