.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 UT505A puts a CAT IV 600 V insulation tester and a True-RMS digital multimeter in one handheld. It tests insulation resistance up to 20 GΩ at voltages from 50 V to 1000 V to IEC 61557, then switches to a 6000-count multimeter for AC/DC voltage, resistance, capacitance, frequency, and low-resistance measurement — so the tool that confirms a winding is open is the same one that checks its insulation. Insulation work includes Polarization Index and DAR diagnostics, stepped-voltage testing, and automatic discharge, 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 20 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 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 safety rating UT505A Details Two Instruments in One The UT505A combines a 1000 V insulation tester with a full True-RMS multimeter, so a single handheld covers both the insulation check and the routine electrical measurements around it — voltage, resistance, capacitance, frequency, and continuity-class low resistance. Insulation Testing to 20 GΩ Five test voltages from 50 V to 1000 V, a 20 GΩ measurement range, and IEC 61557 compliance cover insulation checks on motor windings, cables, and switchgear at low and medium voltage. PI, DAR & Stepped Voltage Timed PI and DAR diagnostics reveal moisture and contamination, while stepped-voltage testing stresses the dielectric in stages to surface marginal insulation a single reading would pass. True-RMS Multimeter A 6000-count True-RMS meter reads AC and DC accurately on distorted waveforms common around drives and non-linear loads, with the resistance, capacitance, and frequency functions a maintenance tech reaches for daily. Safety & Field Build Automatic discharge clears stored charge after each insulation test, and the CAT IV 600 V rating suits work on distribution systems. Storage holds 99 result groups 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 checks on motor windings, cables, and switchgear; preventive maintenance where one tool needs to do both jobs; and field troubleshooting that moves between insulation testing and routine multimeter measurements. Frequently Asked Questions What does the UT505A measure besides insulation resistance? It is a full True-RMS 6000-count multimeter — AC/DC voltage, resistance, capacitance, frequency, and low resistance — in addition to insulation testing to 20 GΩ. What test voltages does it provide? 50 V, 100 V, 250 V, 500 V, and 1000 V, to IEC 61557. How is the UT505A different from the UT505B? The UT505A reads insulation to 20 GΩ; the UT505B extends the range to 200 GΩ and adds an automatic fuse check. Specifications Test Voltages 50 V / 100 V / 250 V / 500 V / 1000 V Insulation Resistance 0.01 MΩ to 20 GΩ IR Accuracy ±(1.5% + 5) DC Voltage 0 to 600 V, ±(2% + 3) AC Voltage 0 to 600 V, ±(2% + 3) 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 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 UT505A Datasheet UT505A User Manual
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