المقاولين,قاطع الدائرة,العاكس للطاقة الشمسية,عداد كهرباء,البطاريات الشمسية
Model positioning: Basic digital megohmmeter with 250-2500 V test voltage; no data storage or USB communication. The higher-end model 1537 features data storage, USB communication, fine-tunable test voltage, ramp test, and AC/DC voltage measurement.
- Core Electrical Specifications
| غرض | حظ 1535 |
| Test Voltage Ranges | 250 V / 500 V / 1000 V / 2500 V (fixed ranges, no 100‑V‑step fine adjustment) |
| نطاق مقاومة العزل | 200 kΩ ~ 500 GΩ |
| Short‑circuit Current | ＞2 mA (＞5 mA for 1537) |
| Automatic Calculation | Polarization Index (باي), Dielectric Absorption Ratio (DAR); No Dielectric Discharge (DD), no Ramp test |
| Leakage Current Measurement | 1 nA‑2 mA; Capacitance Measurement: 0.01‑2 μF |
| تصنيف السلامة | CAT IV 600 V, IEC 61557‑5, درجة التلوث 2 |
| Live‑circuit Alarm | High‑voltage alarm triggered above 30 V; auto‑discharge and residual‑voltage display upon test completion |
| مزود الطاقة | 8 × AA (LR6) alkaline batteries; ≥1300 tests at 2500 V; ≥6500 tests at 250 V |
| أبعاد / وزن | 211 × 93 × 184 mm, 1.3 kg |
| نطاق درجة الحرارة | التشغيل: ‑10℃ ~ +50℃; تخزين: ‑20℃ ~ +60℃; Non‑condensing; Altitude ≤2000 m |
| حماية الدخول | IP40; Backlit LCD; No internal storage, No USB port |
- مقارنة النماذج: 1535 مقابل 1537
| وظيفة | 1535 | 1537 |
| Fixed voltage ranges: 250/500/1000/2500 V | ✅ | ✅ |
| 250‑2500 V fine adjustment in 100 V steps | ❌ | ✅ |
| Automatic PI / DAR calculation | ✅ | ✅ |
| Dielectric Discharge (DD), Ramp voltage test | ❌ | ✅ |
| خل التفاح / DCV and general resistance measurement | ❌ | ✅ |
| Data storage, tagging, USB upload to PC | ❌ | ✅ |
| Short‑circuit current | ＞2 mA | ＞5 mA |
- Standard Packaging List
Standard Deliverables:
- حظ 1535 الوحدة الرئيسية
- 3-colour test leads (أحمر, black, أخضر) with alligator clips
- Red-black test probes
- Soft carrying case
- User manual & quick-start guide
❗ Not included: USB cable, برامج الكمبيوتر, hard-shell tool case (order separately); 8-AA batteries to be provided by user.
- التطبيقات النموذجية
- Insulation testing for motor & generator windings (low-voltage and medium-voltage motor pre-testing)
- Insulation preventive testing for transformers, cables and busbars
- Insulation test for DC side of PV arrays (2500 V range suitable for photovoltaic strings)
- On-site electrical maintenance, fault troubleshooting, pre-/post-overhaul insulation evaluation
- Plant equipment spot-check; handheld on-site use for scenarios without report-generation requirements
👉 Upgrade to Fluke 1537 if you need data logging, report export, ramp withstand test or fine voltage adjustment.
- Selection Pitfalls & Hard-rule Warnings
- 1535 has no storage and cannot export reports via PC. باي / DAR values must be manually recorded on-site; do not expect CSV export after purchase.
- Short-circuit current is only ＞2 mA. For large-capacity long-length cables, charging time is longer and readings stabilize slower compared with the 1537 (5 mA).
- Never perform insulation tests on live circuits. The instrument triggers alarm above 30 V, but full power-off and adequate discharge of the unit-under-test are mandatory.
- Condensation is prohibited. Measurement distortion occurs under high-humidity conditions with dew formation.
- Derate operation above 2000 m altitude; full-range 2500 V testing is not recommended.
- Always wait for automatic discharge completion and verify zero residual voltage before disconnecting test leads.
- Compatible Alternatives
Same-brand upgrade: حظ 1537 (identical form factor, adds storage, USB and ramp test)
Equivalent competitors: Megger MIT2500; HIOKI IR3455-30
Full Comparison: حظ 1535 vs Fluke 1537 Insulation Resistance Tester
These two models share identical enclosure, أبعاد, weight and base measuring range. Key differences lie in short-circuit current, voltage tuning, advanced test functions, data-logging communication and additional multimeter features.
| عنصر المقارنة | حظ 1535 | حظ 1537 |
| Fixed test voltage ranges | 250 V / 500 V / 1000 V / 2500 V | 250 V / 500 V / 1000 V / 2500 V |
| Fine‑step adjustable voltage | ❌ Only four fixed ranges, no fine‑tuning | ✅ 250‑2500 V adjustable in 100 V increments |
| Insulation resistance measuring range | 200 kΩ‑500 GΩ | 200 kΩ‑500 GΩ |
| Short‑circuit current | ＞2 mA | ＞5 mA (faster charging & stabilized readings for large‑capacity cables) |
| Polarization Index (باي) / Dielectric Absorption Ratio (DAR) | ✅ Auto‑calculated | ✅ Auto‑calculated |
| Dielectric Discharge (DD) | ❌ Not supported | ✅ Supported |
| Ramp withstand‑voltage test | ❌ Not supported | ✅ 100 V/s linear ramp with breakdown‑voltage indication |
| خل التفاح / DCV and general resistance measurement | ❌ No multimeter function | ✅ Measures AC/DC voltage & general resistance |
| Data storage & tagging | ❌ Real‑time reading only | ✅ Storage, tagging & scheduled‑test recording |
| USB interface & PC report‑export software | ❌ No USB port, no export capability | ✅ Mini‑USB, report generation with bundled PC software |
| Leakage current / Capacitance measurement | ✅ 1 nA‑2 mA; 0.01‑2 μF | ✅ 1 nA‑2 mA; 0.01‑2 μF |
| Safety rating | CAT IV 600 V | CAT IV 600 V |
| قوة / وزن / Mechanical design | 8 × AA batteries; 1.3 kg; IP40 | 8 × AA batteries; 1.3 kg; IP40 |
Key Difference Explanations
- Short-circuit current (easily overlooked parameter)
ال 1537 delivers ＞5 mA short-circuit current: for long cables and large-capacitance motor windings, charging completes rapidly without long waiting for stable readings.
ال 1535 provides only ＞2 mA. Long stabilization time is required for high-capacitance test objects; it suits small-to-medium motors and short cables.
- Exclusive Ramp test for 1537
Performs withstand-voltage scanning with gradual voltage rise to pinpoint insulation weak points. Widely used in motor overhaul, high-voltage pre-test and incoming-product inspection. ال 1535 outputs fixed high voltage only and cannot execute gradual-ramp tests.
- تسجيل البيانات & report output
حظ 1535: No onboard storage; all readings must be manually transcribed. Suitable for spot-checks, fault-finding and work without formal reporting requirements.
حظ 1537: Stores multiple test sets, exports data via PC and generates reports. Ideal for third-party inspection, power-industry preventive testing, PV site acceptance and archive-oriented workflows.
- Built-in AC/DC voltage measurement
ال 1537 integrates basic multimeter functions to verify residual voltage on-site without carrying an extra multimeter, improving convenience in substation work.
Selection Guidance
✅ Choose Fluke 1535:
Routine plant spot-check and fault diagnosis
Small-to-medium motors and short-length cables
No data-storage or formal-report requirement, manual paper-based logging
Budget-constrained projects
✅ Choose Fluke 1537:
Formal test-report generation and data archiving
Test objects include long-distance power cables, large-capacity motors and large transformers
Advanced insulation diagnostics: Ramp test & Dielectric Discharge for aged-insulation assessment
Non-standard test-voltage requirements (على سبيل المثال. 1700 V, 2100 V)
All-in-one instrument for insulation test plus on-site voltage measurement
Packaging Differences
حظ 1537: Main unit, test leads & probes, soft case; USB cable and PC software CD included. Hard-shell tool case sold separately.
Both models require user-supplied 8-AA batteries.
Hard-rule Notes
- Both instruments require fully power-off test objects. The 30-V live-circuit alarm serves as a reminder and cannot replace formal power-cut & voltage-verification procedures.
- Avoid applying the 1535 to ultra-capacitive long cables: long charging cycles and reading drift may occur.
- ال 1537 stores data locally without onboard printing; reports must be generated after importing datasets to PC software.
حظ 1535 vs 1537｜Selection Conclusion for Power-industry Applications
For power-sector applications (preventive testing, المحطات الفرعية, distribution networks, third-party accredited testing agencies), select the Fluke 1537 بشكل افتراضي. ال 1535 is only acceptable for simple fault-finding without formal data archiving.
Power-field Comparison (aligned with DL/T preventive-test specifications)
| Power‑sector Requirement | حظ 1535 | حظ 1537 | Practical Impact for Field Work |
| Short‑circuit current | ＞2 mA | ＞5 mA | For long cables, large transformers and generator windings (high‑capacitance DUTs), 1537 achieves fast charging and stable readings and cuts waiting time. 1535 exhibits slow charging and reading drift on high‑capacitance equipment. |
| Data storage + USB export | ❌ No storage, only on‑site reading | ✅ Onboard storage, PC export | Preventive testing and condition‑based maintenance demand traceable raw datasets, formal reports and equipment‑insulation archives. ال 1535 only supports manual paper logging without traceability. |
| 100‑V‑step adjustable voltage | ❌ Four fixed ranges only | ✅ 250‑2500 V step tuning | Enables non‑standard test voltages for diagnosis of legacy / aged equipment. |
| Dielectric Discharge (DD) & Ramp test | ❌ Not supported | ✅ Supported | Ramp scanning detects latent insulation defects and prevents equipment damage from direct full‑voltage stress. DD quantifies ageing of old insulation systems. |
| Native AC/DC voltage measurement | ❌ Absent | ✅ Available | Residual‑voltage verification directly on the tester; eliminates the need for an extra multimeter at substations. |
| باي / DAR automatic calculation | ✅ Supported | ✅ Supported | Both comply with PI/DAR test requirements for transformers, motors and cables specified in DL/T474.1‑2018. |
Scenario-based Recommendations
✅ Mandatory selection: حظ 1537 (Most power-industry scenarios)
- Power-utility substation maintenance, distribution-network preventive testing and equipment condition evaluation
- Accredited third-party power-testing services requiring formal traceable test reports
- Test subjects include long-distance power cables, high-capacity distribution transformers and generators / محركات كبيرة
- Advanced insulation diagnostics: ramp-voltage scanning and Dielectric Discharge assessment for aged insulation
- Digital-operation workflows with PC-imported datasets linked to equipment asset ledgers
For high-capacitance test items in power preventive tests, 5 mA short-circuit current is a critical performance index. The 2 mA output of the 1537 results in prolonged unstable readings for long-length cables and reduces field efficiency.
✅ Acceptable selection: حظ 1535 (Limited scenarios only)
- Distribution-network emergency repair and on-site fault troubleshooting without formal preventive-test reporting or long-term archiving
- Test objects are small-capacity equipment and short cables with low capacitance
- Budget constraints, qualitative insulation judgement only; all PI/DAR values manually logged on paper.
Critical Selection Warnings
- The Fluke 1535 cannot export data. Not recommended for accredited third-party testing or acceptance projects where report traceability is mandatory.
- Maximum test voltage for both instruments is 2500 V. Neither can perform 5000-V insulation tests for ≥10 kV main transformers. Select Fluke 1555 / 1550C for 5-kV-range requirements.
- Both units feature CAT IV 600 V safety rating, auto-discharge and residual-voltage indication with identical safety performance.
Procurement Advice
Standard power-team configuration: Primary tester = Fluke 1537. Supplement with a small quantity of 1535 units for emergency-repair crews for fast fault diagnosis.
Hard-shell carrying cases and extended-length test-lead kits are not standard accessories for the 1537. These are strongly recommended for power-site deployment.
