Document Overview
Key Findings All 10 inflation sequences on the ETENWOLF S0-3# unit targeting basketball pressure ranges (0–9 PSI) completed successfully, with pressure accuracy deviations ranging from 0.0 to −0.4 PSI and zero pressure-hold loss observed in the majority of test points. 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 the ETENWOLF S0-3# unit targeting basketball pressure ranges (0–9 PSI) completed successfully, with pressure accuracy deviations ranging from 0.0 to −0.4 PSI and zero pressure-hold loss observed in the majority of test points.
- Product: ETENWOLF S0 Portable Bike Pump — Unit S0-3#
- Test Date: 2025-07-03
- Inflation Medium: Basketball
- Preset Pressure Range Tested: 3–9 PSI
- Total Test Sequences: 10
- Maximum Deviation (Accuracy): −0.4 PSI (Sequence 2, target 6 PSI)
- Pressure-Hold Loss (5 s after stop): 0.0–0.1 PSI across all sequences
- Overall Verdict: Pass — all deviations within acceptable tolerance band
Test Overview
| Parameter | Detail |
|---|---|
| Test Type | Inflation Accuracy (Pressure Preset vs. Stop Pressure) |
| Test Date | 2025-07-03 |
| Product / Model | ETENWOLF S0 Portable Bike Pump |
| Unit Under Test | S0-3# |
| Inflation Target | Basketball (篮球) |
| Manufacturer / Brand | ETENWOLF (BTK) |
| Source File | S0 充气泵-精度测试-2025.7.3.xlsx |
| Sheet Name | S0-3#-蓝球 |
| Sheet Index | 5 of 6 |
| Total Test Rows | 10 sequences |
Test Equipment & Setup
| Item | Detail |
|---|---|
| Device Under Test | ETENWOLF S0 Portable Bike Pump, Unit S0-3# |
| Inflation Target | Standard basketball |
| Pressure Unit | PSI (pounds per square inch) |
| Preset Pressure Range | 3–9 PSI (incremental sequences) |
| Hold Duration After Stop | 5 seconds |
| Measured Parameters | Inflation range (PSI), Preset pressure, Stop pressure, 5 s post-stop pressure, Pressure-hold delta, Accuracy delta |
Test Procedure
- Pre-test: Confirm the basketball is at the specified starting pressure for each sequence. Mount the pump nozzle securely onto the ball valve.
- Preset entry: Set the target pressure (PSI) on the ETENWOLF S0 unit as listed in the preset column for each sequence.
- Inflation: Activate the pump and allow it to run until the auto-stop function engages at the preset pressure threshold.
- Stop-pressure reading: Record the actual pressure displayed or measured at the moment the pump stops (Stop Pressure, PSI).
- 5-second hold reading: Wait 5 seconds without disconnecting the nozzle, then record the pressure again (5 s Stop Pressure, PSI).
- Calculate pressure-hold delta: Subtract stop pressure from 5 s pressure to determine any passive bleed-off (Diff — Hold).
- Calculate accuracy delta: Subtract the preset pressure from the stop pressure to determine how closely the unit hit the target (Diff — Accuracy).
- Post-test: Disconnect nozzle, deflate ball to starting pressure for the next sequence, and repeat steps 1–7 for all 10 sequences.
- Acceptance criteria: Accuracy delta within ±0.5 PSI; pressure-hold delta no worse than −0.2 PSI over 5 seconds.
Test Data & Results
| No. | Inflation Target | Inflation Range (PSI) | Preset Pressure (PSI) | Stop Pressure (PSI) | 5 s Stop Pressure (PSI) | Diff — Hold (PSI) | Diff — Accuracy (PSI) | Remarks |
|---|---|---|---|---|---|---|---|---|
| 1 | Basketball | 0–3 | 3 | 2.7 | 2.7 | 0 | −0.3 | |
| 2 | Basketball | 3–6 | 6 | 5.6 | 5.6 | 0 | −0.4 | |
| 3 | Basketball | 6–8 | 8 | 7.8 | 7.7 | −0.1 | −0.3 | |
| 4 | Basketball | 8–9 | 9 | 9.0 | 9.0 | 0 | 0 | |
| 5 | Basketball | 0–4 | 4 | 3.8 | 3.8 | 0 | −0.2 | |
| 6 | Basketball | 4–6 | 6 | 5.7 | 5.7 | 0 | −0.3 | |
| 7 | Basketball | 0–5 | 5 | 4.8 | 4.8 | 0 | −0.2 | |
| 8 | Basketball | 5–7 | 7 | 6.8 | 6.8 | 0 | −0.2 | |
| 9 | Basketball | 7–8 | 8 | 7.9 | 7.8 | −0.1 | −0.2 | |
| 10 | Basketball | 8–9 | 9 | 9.0 | 8.9 | −0.1 | −0.1 |
Observations: Accuracy deviations are consistently negative (pump undershoots preset slightly), ranging from 0.0 to −0.4 PSI. The worst-case undershoot of −0.4 PSI occurred at Sequence 2 (target 6 PSI, range 3–6 PSI). Sequence 4 achieved exact preset pressure (0.0 PSI deviation). Pressure-hold loss over 5 seconds was 0.0 PSI in 7 of 10 sequences and −0.1 PSI in the remaining 3 sequences, indicating excellent valve sealing performance. All values fall within the ±0.5 PSI acceptance threshold.
Conclusion
| Item | Detail |
|---|---|
| Test Standard / Criteria | Accuracy delta within ±0.5 PSI; hold loss ≤ 0.2 PSI over 5 s |
| Conditions | Basketball inflation, PSI unit, ambient lab conditions, Unit S0-3# |
| Samples Tested | 1 unit (S0-3#), 10 inflation sequences |
| Worst-Case Accuracy Delta | −0.4 PSI (Sequence 2, 6 PSI preset) |
| Worst-Case Hold Delta | −0.1 PSI (Sequences 3, 9, 10) |
| Overall Result | PASS — All deviations within specified tolerance |
Document Information
| Role | Name |
|---|---|
| Tester / Operator | BTK |
| Test Date | 2025-07-03 |
| Source Document | S0 充气泵-精度测试-2025.7.3.xlsx, Sheet: S0-3#-蓝球 (Sheet 5 of 6) |
| Product Line | Inflation Tools — 0气泵类项目 |
Frequently Asked Questions
What pressure accuracy can I expect from the ETENWOLF S0 when inflating a basketball?
In testing on Unit S0-3#, the ETENWOLF S0 achieved accuracy deviations between 0.0 and −0.4 PSI across preset targets of 3–9 PSI. The pump consistently undershoots the preset by a small margin rather than overshooting, which is the safer behavior for ball inflation. All results fell within the ±0.5 PSI acceptance threshold.
Does the ETENWOLF S0 hold pressure after the pump stops?
Yes. In 7 of 10 test sequences the pressure reading was identical at the stop point and 5 seconds later (0.0 PSI loss). In the remaining 3 sequences the loss was −0.1 PSI over 5 seconds, indicating excellent valve and nozzle sealing during the disconnect window.
What PSI range is recommended for inflating a basketball with the ETENWOLF S0?
Standard basketball inflation pressure is typically 7.5–8.5 PSI (NBA specification). The ETENWOLF S0 was tested across 0–9 PSI in incremental sequences and performed accurately throughout that range, making it suitable for inflating basketballs to regulation pressure.
How does Unit S0-3# accuracy compare to other S0 units tested?
This report covers Unit S0-3# specifically (Sheet 5 of 6 in the test workbook). Results for Units S0-1# and S0-2# on basketball inflation are documented in the sibling test sheets S0-1#-蓝球 and S0-2#-蓝球 from the same test session. Cross-referencing those reports provides a full multi-unit accuracy picture.
Related Products
Explore the full ETENWOLF S0 accuracy test series from the same 2025-07-03 session:
- ETENWOLF S0 Portable Bike Pump — Product Page
- S0 Unit 1# — Basketball Accuracy Test (S0-1#-蓝球)
- S0 Unit 1# — Bicycle / Mountain Bike Accuracy Test (S0-1#-自行车-山地车)
- S0 Unit 2# — Basketball Accuracy Test (S0-2#-蓝球)
- S0 Unit 2# — Bicycle / Mountain Bike Accuracy Test (S0-2#自行车-山地车)
- S0 Unit 3# — Bicycle / Mountain Bike Accuracy Test (S0-3#-自行车-山地车)