Document Overview
Key Findings The ETENWOLF S0 Portable Bike Pump (unit S0-1#) was tested for pressure accuracy during basketball inflation across 10 sequential inflation segments on 2025-07-03. All measured stop pressures fell within −0.4 PSI of the preset target, demonstrating consistent and acceptable accuracy across the full…
- Document type
- Test Report
- Prepared by
- Daniel Wright
- Published
- Last reviewed
- Topics
- Motor Performance
Key Findings
The ETENWOLF S0 Portable Bike Pump (unit S0-1#) was tested for pressure accuracy during basketball inflation across 10 sequential inflation segments on 2025-07-03. All measured stop pressures fell within −0.4 PSI of the preset target, demonstrating consistent and acceptable accuracy across the full operating range of 0–9 PSI.
- Product: ETENWOLF S0 Portable Bike Pump — Unit S0-1#
- Test Date: 2025-07-03
- Test Type: Pressure Accuracy (Motor Performance)
- Ball Type: Basketball
- Inflation Range Tested: 0–9 PSI (10 segments)
- Worst-Case Accuracy Deviation: −0.4 PSI (Rows 3, 5)
- Best-Case Accuracy Deviation: 0.0 PSI (Row 9)
- Pressure Retention (Hold Δ after 5 s): 0.0 PSI in 9 of 10 segments; −0.1 PSI in 1 segment
- Overall Result: Pass — all deviations within acceptable tolerance band
Test Overview
| Field | Detail |
|---|---|
| Test Type | Pressure Accuracy (Motor Performance) |
| Sheet / Sample ID | S0-1# — Basketball |
| Test Date | 2025-07-03 |
| Product | ETENWOLF S0 Portable Bike Pump |
| Unit Under Test | S0-1# |
| Manufacturer / Brand | ETENWOLF (BTK) |
| Ball Type | Basketball (篮球) |
| Total Inflation Segments | 10 |
| Pressure Unit | PSI |
| Source File | S0 充气泵-精度测试-2025.7.3.xlsx |
Test Equipment & Setup
| Parameter | Value |
|---|---|
| Unit Under Test | ETENWOLF S0 Portable Bike Pump, S/N S0-1# |
| Ball Type | Basketball |
| Pressure Measurement Unit | PSI |
| Preset Pressure Source | Built-in digital pressure controller on S0 unit |
| Stop Pressure Measurement | Recorded at pump auto-stop point |
| Post-Stop Hold Measurement | Recorded 5 seconds after pump auto-stop |
| Accuracy (Deviation) Calculation | Stop Pressure − Preset Pressure |
| Pressure Retention Calculation | 5 s Hold Pressure − Stop Pressure |
| Test Range | 0–9 PSI across 10 sequential segments |
Test Procedure
- Pre-test: Confirm the basketball is deflated to the starting pressure of each segment before each measurement. Verify the S0 unit powers on normally and the display reads correctly.
- Preset entry: Input the target preset pressure (PSI) into the S0 pump’s digital controller for the segment under test.
- Inflation: Connect the S0 pump to the basketball valve and begin inflation. Allow the pump to run until the auto-stop function activates.
- Stop pressure recording: Immediately record the pressure reading at the moment the pump auto-stops (Stop Pressure, PSI).
- 5-second hold recording: Wait 5 seconds without disconnecting the hose, then record the pressure again (Stop 5 s Pressure, PSI).
- Deviation calculations: Calculate Pressure Retention Δ = (5 s Pressure − Stop Pressure) and Accuracy Deviation = (Stop Pressure − Preset Pressure).
- Post-test: Deflate the basketball to the next segment’s starting pressure and repeat steps 2–6 for all 10 segments.
- Acceptance criteria: Accuracy deviation within the allowable tolerance band for the product specification; pressure retention loss ≤ acceptable threshold over 5 s.
Test Data & Results
| # | Ball Type | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | Stop 5 s Pressure (PSI) | Pressure Retention Δ (PSI) | Accuracy Deviation (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Basketball | 0–3 | 3 | 2.7 | 2.7 | 0.0 | −0.3 | |
| 2 | Basketball | 3–6 | 6 | 5.7 | 5.7 | 0.0 | −0.3 | |
| 3 | Basketball | 6–8 | 8 | 7.7 | 7.6 | −0.1 | −0.4 | |
| 4 | Basketball | 8–9 | 9 | 8.8 | 8.8 | 0.0 | −0.2 | |
| 5 | Basketball | 0–4 | 4 | 3.7 | 3.6 | −0.1 | −0.4 | |
| 6 | Basketball | 4–6 | 6 | 5.9 | 5.9 | 0.0 | −0.1 | |
| 7 | Basketball | 0–5 | 5 | 4.9 | 4.9 | 0.0 | −0.1 | |
| 8 | Basketball | 5–7 | 7 | 6.9 | 6.9 | 0.0 | −0.1 | |
| 9 | Basketball | 7–8 | 8 | 8.0 | 8.0 | 0.0 | 0.0 | |
| 10 | Basketball | 8–9 | 9 | 8.9 | 8.9 | 0.0 | −0.1 |
Observations: All 10 inflation segments produced stop pressures at or below the preset target, with deviations ranging from 0.0 PSI to −0.4 PSI. The largest deviation of −0.4 PSI occurred in segments 3 (6–8 PSI range, preset 8 PSI) and 5 (0–4 PSI range, preset 4 PSI). Pressure retention over the 5-second post-stop hold was excellent, with a loss of only −0.1 PSI in segments 3 and 5 and zero loss in the remaining eight segments. Row 9 (7–8 PSI range, preset 8 PSI) achieved a perfect 0.0 PSI deviation.
Conclusion
| Parameter | Detail |
|---|---|
| Test Result | Pass |
| Ball Type | Basketball |
| Unit Tested | S0-1# |
| Pressure Range Covered | 0–9 PSI (10 segments) |
| Max Accuracy Deviation Observed | −0.4 PSI |
| Min Accuracy Deviation Observed | 0.0 PSI |
| Max Pressure Retention Loss (5 s) | −0.1 PSI |
| Verdict | The ETENWOLF S0 unit S0-1# demonstrates consistent pressure accuracy during basketball inflation. All deviations are negative (pump under-shoots preset), which is a safe failure mode. Pressure retention over 5 seconds is negligible. Unit passes accuracy requirements. |
Document Information
| Role | Name |
|---|---|
| Tester / Author | Daniel Wright |
| Brand | ETENWOLF (BTK) |
| Source Document | S0 充气泵-精度测试-2025.7.3.xlsx |
| Sheet Name | S0-1#-蓝球 (Basketball, Unit 1) |
| Sheet Index | 1 of 6 |
| Test Date | 2025-07-03 |
| Published Date | 2026-07-11 |
Frequently Asked Questions
How accurate is the ETENWOLF S0 pump when inflating a basketball?
In controlled accuracy testing across 10 inflation segments from 0 to 9 PSI, the S0 pump stopped within −0.4 PSI of the preset target in the worst case and achieved exactly 0.0 PSI deviation in the best case. All deviations were negative, meaning the pump slightly under-shoots the target — a safe behavior that avoids over-inflation.
Does the ETENWOLF S0 hold pressure after it auto-stops?
Yes. In the 5-second post-stop hold test, eight of ten segments showed zero pressure loss. The remaining two segments (preset targets of 8 PSI and 4 PSI) each lost only 0.1 PSI over five seconds, which is negligible for basketball use.
What PSI range was tested for basketball inflation on the S0?
The test covered 0 to 9 PSI across 10 sequential inflation segments, encompassing the full practical range for standard basketball inflation. All segments produced results within the acceptable accuracy band.
Which ETENWOLF S0 unit was used in this basketball accuracy test?
Unit S0-1# was used. The same test protocol was also conducted on units S0-2# and S0-3# in sibling test sheets covering both basketball and mountain bike tire inflation scenarios.
Related Products & Reports
Learn more about the ETENWOLF S0 Portable Bike Pump or explore the other accuracy test sheets from the same test session:
- S0-1# — Basketball (current report)
- S0-1# — Bicycle / Mountain Bike
- S0-2# — Basketball
- S0-2# — Bicycle / Mountain Bike
- S0-3# — Basketball
- S0-3# — Bicycle / Mountain Bike