Document Overview
Key Findings All 10 inflation sequences on Sample 2 (S0-2#) targeting basketball pressure ranges completed with a stop-pressure accuracy within −0.4 PSI of the preset value, and pressure retention over the 5-second hold period was stable to within −0.1 PSI. Product: ETENWOLF S0 Portable Bike…
- Document type
- Test Report
- Prepared by
- Daniel Wright
- Published
- Last reviewed
- Topics
- Motor Performance
Key Findings
All 10 inflation sequences on Sample 2 (S0-2#) targeting basketball pressure ranges completed with a stop-pressure accuracy within −0.4 PSI of the preset value, and pressure retention over the 5-second hold period was stable to within −0.1 PSI.
- Product: ETENWOLF S0 Portable Bike Pump — Sample 2 (S0-2#)
- Test date: 2025-07-03
- Test object: Basketball inflation (篮球)
- Preset pressure range tested: 3 PSI – 9 PSI
- Maximum stop-pressure deviation: −0.4 PSI (sequence 1, 0→3 PSI)
- Maximum 5 s hold deviation from preset: −0.4 PSI
- Maximum pressure loss during 5 s hold: −0.1 PSI
- All sequences passed with accuracy well within the ±0.5 PSI acceptance band
Test Overview
| Field | Detail |
|---|---|
| Test Type | Pressure Accuracy (Motor Performance) |
| Report Reference | S0 充气泵-精度测试-2025.7.3 — Sheet S0-2#-蓝球 (Sheet 4 of 6) |
| Test Date | 2025-07-03 |
| Product | ETENWOLF S0 Portable Bike Pump |
| Sample ID | S0-2# |
| Brand / Manufacturer | ETENWOLF (BTK) |
| Test Object | Basketball (篮球) |
| Pressure Unit | PSI |
| Total Sequences | 10 |
Test Equipment & Setup
| Parameter | Value |
|---|---|
| Device Under Test | ETENWOLF S0 Portable Bike Pump, Sample S0-2# |
| Inflation Target | Basketball |
| Pressure Unit | PSI |
| Preset Pressure Range | 3 PSI – 9 PSI (per sequence) |
| Hold Duration After Stop | 5 seconds |
| Accuracy Measurement | Difference between preset PSI and stop PSI; difference between preset PSI and 5 s PSI |
| Retention Measurement | Difference between stop PSI and 5 s PSI |
Test Procedure
- Pre-test: Confirm basketball is at or below the starting pressure for each sequence. Attach the S0-2# pump nozzle securely to the ball valve.
- Preset: Set the target pressure on the S0 pump to the specified preset value (PSI) for the sequence.
- Inflation: Activate the pump and allow it to inflate from the starting pressure to the preset cutoff.
- Stop reading: Record the actual pressure displayed at the moment the pump auto-stops (Stop Pressure, PSI).
- 5-second hold: Wait 5 seconds with the nozzle still attached and record the pressure again (Stop 5 s Pressure, PSI).
- Calculate retention deviation (差值保压): Stop 5 s PSI − Stop PSI.
- Calculate accuracy deviation (差值精度): Stop PSI − Preset PSI.
- Post-test: Detach nozzle, deflate ball to starting pressure for next sequence, and repeat for all 10 sequences.
- Acceptance criterion: Accuracy deviation must remain within ±0.5 PSI of the preset value across all sequences.
Test Data & Results
| No. | Object | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | Stop 5 s Pressure (PSI) | Retention Deviation (PSI) | Accuracy Deviation (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Basketball | 0–3 | 3 | 2.6 | 2.6 | 0 | −0.4 | |
| 2 | Basketball | 3–6 | 6 | 5.8 | 5.8 | 0 | −0.2 | |
| 3 | Basketball | 6–8 | 8 | 7.9 | 7.8 | −0.1 | −0.2 | |
| 4 | Basketball | 8–9 | 9 | 8.9 | 8.9 | 0 | −0.1 | |
| 5 | Basketball | 0–4 | 4 | 3.8 | 3.8 | 0 | −0.2 | |
| 6 | Basketball | 4–6 | 6 | 5.8 | 5.8 | 0 | −0.2 | |
| 7 | Basketball | 0–5 | 5 | 4.9 | 4.9 | 0 | −0.1 | |
| 8 | Basketball | 5–7 | 7 | 6.8 | 6.8 | 0 | −0.2 | |
| 9 | Basketball | 7–8 | 8 | 8.0 | 7.9 | −0.1 | −0.1 | |
| 10 | Basketball | 8–9 | 9 | 8.9 | 8.8 | −0.1 | −0.2 |
Observations: Across all 10 sequences the pump consistently under-shot the preset by a small margin (−0.1 to −0.4 PSI), which is characteristic of a conservative cutoff algorithm. Pressure retention over the 5-second hold was excellent — 7 of 10 sequences showed zero pressure loss and the remaining 3 showed only −0.1 PSI loss, indicating negligible valve or seal leakage at basketball pressure levels (up to 9 PSI). The worst accuracy reading (−0.4 PSI at the 0→3 PSI sequence) is the only result approaching the ±0.5 PSI band limit; all other readings fall well within ±0.3 PSI.
Conclusion
| Item | Detail |
|---|---|
| Result | PASS |
| Standard / Criterion | Accuracy deviation within ±0.5 PSI of preset |
| Pressure Range Covered | 0–9 PSI (basketball use range) |
| Sample | S0-2# (1 unit, 10 sequences) |
| Maximum Accuracy Deviation | −0.4 PSI (sequence 1) |
| Maximum Retention Loss | −0.1 PSI (sequences 3, 9, 10) |
| Verdict | The ETENWOLF S0 Sample 2 meets the pressure accuracy specification for basketball inflation across all tested pressure steps. |
Document Information
| Role | Name | Detail |
|---|---|---|
| Tester | BTK Test Team | Recorded 2025-07-03 |
| Source File | S0 充气泵-精度测试-2025.7.3.xlsx | Sheet: S0-2#-蓝球 (Index 3, Sheet 4 of 6) |
| Product Line | Inflation Tools | Category: 0气泵类项目 |
| Author (Article) | Daniel Wright | daniel.wright |
Frequently Asked Questions
How accurate is the ETENWOLF S0 pump when inflating a basketball?
In this test on Sample 2 (S0-2#), the S0 stopped within −0.1 to −0.4 PSI of the preset value across all 10 sequences between 3 and 9 PSI. Every reading remained within the ±0.5 PSI acceptance band, confirming reliable accuracy for basketball inflation.
Does the ETENWOLF S0 hold pressure after it auto-stops?
Yes. During the 5-second hold period after auto-stop, 7 of 10 sequences showed zero pressure drop. The other 3 sequences lost only 0.1 PSI, indicating the pump’s nozzle seal maintains pressure reliably at basketball inflation levels.
What PSI range does the ETENWOLF S0 support for basketball inflation?
The standard basketball inflation range is roughly 7.5–8.5 PSI (NBA spec). This test verified S0 accuracy from 3 PSI up to 9 PSI in incremental steps, covering the full practical range for both recreational and regulation basketball use.
How does Sample 2 compare to the other S0 samples tested?
This report covers Sample S0-2# basketball sequences only. Results from Sample S0-1# and S0-3# basketball tests, as well as mountain-bike tire tests for all three samples, are documented in the sibling test sheets linked in the Related Products section below.
Related Products
Explore the full ETENWOLF S0 Portable Bike Pump product page, or review the other accuracy test reports from the same Excel workbook:
- S0-1# Basketball: S0-1#-蓝球 — Sample 1 basketball pressure accuracy
- S0-1# Mountain Bike: S0-1#-自行车-山地车 — Sample 1 mountain-bike tire accuracy
- S0-2# Mountain Bike: S0-2#自行车-山地车 — Sample 2 mountain-bike tire accuracy
- S0-3# Basketball: S0-3#-蓝球 — Sample 3 basketball pressure accuracy
- S0-3# Mountain Bike: S0-3#-自行车-山地车 — Sample 3 mountain-bike tire accuracy