CRT‑100P / CRT‑200P Contact Resistance Tester
High‑current contact resistance testers for switchgear loops and DC cable resistance — continuous output (to puncture oxide layers), strong anti‑interference measurement and fast, precise results.
Why choose CRT‑100P / CRT‑200P?
Continuous high current
Breaks through oxide films for true contact resistance results (50/100 A on 100P; up to 200 A on 200P).
Anti‑interference
Stable readings in harsh EM environments — final digit typically varies within ±1 count.
Portable & rugged
Compact, light and field‑ready for substation work.
Touchscreen & storage
4″ touch display, 200 record memory with USB (U‑disk) export.
Where CRT‑100P / CRT‑200P excel
Ideal for high/low‑voltage switch contact resistance, DC cable resistance and factory loop resistance checks.
Switchgear loops
Measure contact/loop resistance on breakers and disconnectors.
Busbars & joints
4‑wire Kelvin clips isolate joint resistance from leads.
DC cable lines
Verify cable DC resistance and connections.
Factory QA
Meets typical utility specifications for loop resistance measurement.
CRT‑100P / CRT‑200P — Models & Key Specifications
DC test current: 100P → 50/100 A
DC test current: 200P → 50/100/150/200 A
Resolution: 0.01 µΩ / 0.1 µΩ
Accuracy: ±(0.5% rd + 2 dgt)
| Spec | CRT-100P | CRT-200P |
|---|---|---|
| Primary test currents | 50 A, 100 A (fixed) | 50 A, 100 A, 150 A, 200 A (fixed) Wider range |
| Measurement range |
0–2999.9 µΩ
|
50 A: 0–10 mΩ
100 A: 0–5 mΩ
150 A: 0–3.333 mΩ
200 A: 0–2.500 mΩ
|
| Resolution |
0–99.99 µΩ: 0.01 µΩ
100.0–2999.9 µΩ: 0.1 µΩ
|
0–99.99 µΩ: 0.01 µΩ
100.0–10,000.0 µΩ: 0.1 µΩ
|
| Accuracy | ±(0.5% rd + 2 dgt) | ±(0.5% rd + 2 dgt) |
| Display & memory | 4″ touch display Up to 200 records |
4″ touch display Up to 200 records |
| Data transfer | USB (U-disk) | USB (U-disk) |
| Best for |
Routine switchgear loops
When 50/100 A is sufficient
|
Heavier-duty joints & busbars Higher current
When 150–200 A is required to break oxide films
|
| Typical outcome |
Fast verification at standard currents
—
|
Improved stability on low-µΩ joints at higher drive
—
|
Tip: Choose CRT-200P if your procedures call for ≥150 A or stubborn oxide layers; otherwise CRT-100P is a lighter, simpler fit.
What’s in the box
Test leads with pliers
Red & black Kelvin clips (high-current)
Earth lead
Protective grounding
Power cord
AC 220 V
Accessory bag
Carry & protect
Spare fuse
5 A (×3)
User manual & warranty
12-month warranty (with registration)
Items may vary by configuration.
Compliance & Warranty
CE
IEC 61010-1 (design intent)
EMC: IEC 61326 (industrial)
RoHS
Safety: Low-ohmic, high-current measurement with protected outputs and automatic discharge. Use 4-wire Kelvin connections and follow site procedures.
Warranty: 12-month coverage against defects in materials and workmanship (registration may be required; consumables excluded).
Calibration: Factory-calibrated at shipment; periodic recalibration recommended for compliance-critical work.
Documentation: For the complete, model-specific standards list, see the datasheet and Declaration of Conformity (available on request).
Warranty: 12-month coverage against defects in materials and workmanship (registration may be required; consumables excluded).
Calibration: Factory-calibrated at shipment; periodic recalibration recommended for compliance-critical work.
Documentation: For the complete, model-specific standards list, see the datasheet and Declaration of Conformity (available on request).
Downloads & Resources
Datasheet
User Manual
Please contact
Kelvin 4-wire connection — Circuit breaker contact
Current lead I+
Current lead I−
Sense lead V+
Sense lead V−
Use 100P (≈100 A) or 200P (≈200 A) model as required. Ensure the breaker is safely isolated and closed for test.
Kelvin 4-wire connection — Busbar / joint
I+ current (clip)
I− current (clip)
V+ sense (probe)
V− sense (probe)
Keep sense points inside current points to avoid including lead or bolt contact resistance outside the joint.
Safety & good practice
• De-energize and isolate the asset; confirm lock-out/tag-out.
• Start with low current, verify polarity, then ramp as required (100P ≈100 A, 200P ≈200 A).
• Clean/secure contact points; avoid shared/painted surfaces; maintain firm clip pressure.
• Allow stabilization for thermal EMF; take multiple readings and average if needed.
• De-energize and isolate the asset; confirm lock-out/tag-out.
• Start with low current, verify polarity, then ramp as required (100P ≈100 A, 200P ≈200 A).
• Clean/secure contact points; avoid shared/painted surfaces; maintain firm clip pressure.
• Allow stabilization for thermal EMF; take multiple readings and average if needed.
Have questions about the CRT-100P/200P or need a quote?
Our engineers can help with specs, lead times and compatibility.
We respond within 1 business day · Last updated 2025-10-08<\/p>