Document Overview
Key Findings The ETENWOLF S0-2# pump unit completed 10 sequential basketball inflation runs on 2025-08-03, with all stop-pressure readings landing within −0.5 PSI of the preset target and post-5-second hold losses never exceeding 0.1 PSI. Unit tested: S0-2# (Basketball / 篮球) Preset range tested: 3…
- Document type
- Test Report
- Prepared by
- Daniel Wright
- Published
- Last reviewed
- Topics
- Motor Performance
Key Findings
The ETENWOLF S0-2# pump unit completed 10 sequential basketball inflation runs on 2025-08-03, with all stop-pressure readings landing within −0.5 PSI of the preset target and post-5-second hold losses never exceeding 0.1 PSI.
- Unit tested: S0-2# (Basketball / 篮球)
- Preset range tested: 3 – 9 PSI
- Worst-case accuracy deviation: −0.5 PSI (run 2, preset 6 PSI)
- Worst-case hold-pressure drop (5 s): −0.1 PSI
- Best-case accuracy deviation: −0.3 PSI (runs 5, 6, 7)
- Runs with zero 5-second pressure loss: 3 of 10 (runs 3, 5, 6)
- Test date: 2025-08-03 | Tester org: BTK
Test Overview
| Field | Detail |
|---|---|
| Test Type | Pressure Accuracy (Motor Performance) |
| Test Date | 2025-08-03 |
| Report Source File | S0 精度测试-2025.8.4.xlsx — Sheet: S0-2#-蓝球 (Sheet 4 of 4) |
| Product | ETENWOLF S0 Portable Bike Pump — Unit S0-2# |
| Product Line | Inflation Tools |
| Test Object | Basketball (篮球) |
| Testing Organization | BTK |
| Sample Quantity | 1 unit (S0-2#) |
| Pressure Unit | PSI |
Test Equipment & Setup
| Parameter | Value |
|---|---|
| Device Under Test | ETENWOLF S0 Pump — serial/batch S0-2# |
| Inflation Target Object | Standard Basketball |
| Pressure Unit | PSI (pounds per square inch) |
| Preset Pressure Range Covered | 3 PSI – 9 PSI |
| Starting Pressure Conditions | 0 PSI, 3 PSI, 4 PSI, 5 PSI, 7 PSI, 8 PSI (varied per run) |
| Post-Stop Hold Duration | 5 seconds |
| Number of Test Runs | 10 |
| Recording Parameters | Stop pressure (PSI), 5-second hold pressure (PSI), hold-pressure delta, accuracy delta vs preset |
Test Procedure
- Pre-test: Confirm basketball is deflated to the required starting pressure for each run as specified in the inflation range column (e.g., 0 PSI, 3 PSI, 4 PSI).
- Preset entry: Set the target pressure on the S0-2# unit to the designated preset value (PSI) for that run.
- Inflation: Initiate inflation. The pump runs until the internal sensor triggers auto-stop at the preset pressure.
- Stop-pressure recording: Immediately record the displayed or measured pressure at the moment the pump stops (Stop Pressure).
- 5-second hold: Wait 5 seconds without removing the nozzle, then record the pressure again (Stop 5 s Pressure).
- Delta calculations:
- Hold-pressure delta = Stop 5 s Pressure − Stop Pressure (measures valve/seal leak during hold)
- Accuracy delta = Stop Pressure − Preset Pressure (measures how close auto-stop is to target)
- Post-test: Deflate basketball to next run’s starting pressure and repeat for all 10 runs.
- Acceptance criterion: Accuracy delta within the device’s specified tolerance; hold-pressure loss minimized.
Test Data & Results
| No. | Object | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | Stop 5 s Pressure (PSI) | Hold-Pressure Delta (PSI) | Accuracy Delta (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Basketball | 0 – 3 | 3 | 2.7 | 2.6 | −0.10 | −0.40 | |
| 2 | Basketball | 3 – 6 | 6 | 5.6 | 5.5 | −0.10 | −0.50 | |
| 3 | Basketball | 6 – 8 | 8 | 7.6 | 7.6 | 0.00 | −0.40 | |
| 4 | Basketball | 8 – 9 | 9 | 8.7 | 8.6 | −0.10 | −0.40 | |
| 5 | Basketball | 0 – 4 | 4 | 3.7 | 3.7 | 0.00 | −0.30 | |
| 6 | Basketball | 4 – 6 | 6 | 5.7 | 5.7 | 0.00 | −0.30 | |
| 7 | Basketball | 0 – 5 | 5 | 4.8 | 4.7 | −0.10 | −0.30 | |
| 8 | Basketball | 5 – 7 | 7 | 6.7 | 6.6 | −0.10 | −0.40 | |
| 9 | Basketball | 7 – 8 | 8 | 7.7 | 7.6 | −0.10 | −0.40 | |
| 10 | Basketball | 8 – 9 | 9 | 8.7 | 8.6 | −0.10 | −0.40 |
Observations: Across all 10 runs the auto-stop pressure consistently undershot the preset by 0.3 – 0.5 PSI, indicating a slight systematic under-inflation bias in the S0-2# sensor calibration. Hold-pressure loss over 5 seconds was either 0.00 or −0.10 PSI in every run, confirming the nozzle seal and valve retention are performing well. The largest accuracy deviation (−0.50 PSI) occurred at the 6 PSI preset in run 2; the smallest (−0.30 PSI) occurred at 4, 5, and 6 PSI presets in runs 5, 6, and 7. No anomalous readings or test interruptions were recorded.
Conclusion
| Item | Detail |
|---|---|
| Product | ETENWOLF S0 Portable Bike Pump — Unit S0-2# |
| Test Object | Basketball |
| Preset Pressure Range | 3 – 9 PSI |
| Accuracy Delta Range | −0.30 PSI to −0.50 PSI (all runs under-inflated relative to preset) |
| Hold-Pressure Loss (5 s) | 0.00 PSI to −0.10 PSI |
| Systematic Bias | Consistent under-shoot; no over-inflation observed in any run |
| Seal / Valve Performance | Pass — pressure loss ≤ 0.10 PSI over 5-second hold across all runs |
| Overall Verdict | Data recorded; accuracy bias noted for calibration reference |
Document Information
| Role | Name | Detail |
|---|---|---|
| Testing Organization | BTK | |
| Article Author | Daniel Wright | Author Profile |
| Source File | S0 精度测试-2025.8.4.xlsx | |
| Sheet Name | S0-2#-蓝球 (Sheet Index 3, Total Sheets 4) | |
| Test Date | 2025-08-03 | |
| Article Date | 2026-07-11 | |
Frequently Asked Questions
What is the pressure accuracy of the ETENWOLF S0 pump when inflating a basketball?
In testing of unit S0-2#, the auto-stop pressure undershot the preset target by between 0.30 PSI and 0.50 PSI across all 10 runs at presets from 3 to 9 PSI. This means the pump stops slightly before the target, which prevents over-inflation and protects the ball.
Does the ETENWOLF S0 hold pressure after the pump stops?
Yes. In the 5-second hold test conducted immediately after auto-stop, pressure loss was either 0.00 PSI or 0.10 PSI across all 10 basketball inflation runs, confirming that the nozzle seal and internal valve maintain pressure effectively after the pump cuts off.
What PSI range was tested for basketball inflation on the ETENWOLF S0?
The S0-2# unit was tested across preset pressures of 3, 4, 5, 6, 7, 8, and 9 PSI, covering the full standard basketball inflation range. Starting pressures ranged from 0 PSI to 8 PSI depending on the run sequence.
How does the S0-2# unit compare to the S0-1# unit for basketball accuracy?
Both units were tested under identical basketball inflation conditions. The S0-1# basketball accuracy data is published in the sibling sheet report linked below. Comparing the two reports allows side-by-side evaluation of unit-to-unit consistency for the ETENWOLF S0 product line.
Related Products
Explore other ETENWOLF S0 accuracy test reports from the same test session:
- ETENWOLF S0 Portable Bike Pump — Product Page
- S0-1# Basketball Accuracy Test Report (S0-1#-蓝球) — sibling sheet from the same Excel file
- S0-1# Bicycle / Mountain Bike Accuracy Test Report (S0-1#-自行车-山地车) — sibling sheet from the same Excel file
- S0-2# Bicycle / Mountain Bike Accuracy Test Report (S0-2#自行车-山地车) — sibling sheet from the same Excel file