ETENWOLF S0 Portable Bike Pump Accuracy Test Report — Basketball (Unit S0-1#)

Document Overview

Key Findings The ETENWOLF S0-1# portable pump completed 10 sequential basketball inflation runs on 2025-08-03, stopping within 0.10–0.40 PSI of each preset target across a 0–9 PSI working range. Product: ETENWOLF S0-1# Portable Pump Test Object: Basketball (篮球) Pressure Range Tested: 0–9 PSI Preset Targets:…

Document type: Test Report
Prepared by: Daniel Wright
Published: July 21, 2026
Last reviewed: July 21, 2026
Topics: Motor Performance

Key Findings

The ETENWOLF S0-1# portable pump completed 10 sequential basketball inflation runs on 2025-08-03, stopping within 0.10–0.40 PSI of each preset target across a 0–9 PSI working range.

Product: ETENWOLF S0-1# Portable Pump
Test Object: Basketball (篮球)
Pressure Range Tested: 0–9 PSI
Preset Targets: 3, 4, 5, 6, 7, 8, 9 PSI (multiple segments)
Accuracy Deviation Range: −0.30 to −0.60 PSI (all under-pressure at stop)
5-Second Hold Pressure Drop: 0.00 to −0.10 PSI (excellent short-term retention)
All 10 runs completed without noted anomaly

Test Overview

Field	Detail
Test Date	2025-08-03
Test Type	Pressure Accuracy (Motor Performance)
Internal Code	BTK
Product Number / Name	S0-1#
Product	ETENWOLF S0 Portable Bike Pump
Test Object	Basketball
Source File	S0 精度测试-2025.8.4.xlsx — Sheet: S0-1#-蓝球 (Sheet 2 of 4)
Product Line	Inflation Tools
Category	Air Pump Products (气泵类项目)

Test Equipment & Setup

Parameter	Value
Unit Under Test	ETENWOLF S0-1# Portable Pump
Inflation Target Object	Basketball
Pressure Unit	PSI
Preset Pressure Range	0–9 PSI
Hold Duration After Stop	5 seconds
Measurement Points	Stop pressure (PSI) and 5-second post-stop pressure (PSI)
Deviation Columns Recorded	Retention delta (stop vs. 5 s) and accuracy delta (5 s vs. preset)

Test Procedure

Pre-test: Deflate basketball to the starting pressure indicated in the inflation range column (e.g., 0 PSI, 3 PSI, 4 PSI, etc.).
Setup: Connect the S0-1# pump to the basketball valve and set the digital preset to the target pressure (PSI) for that run.
Inflation: Start the pump and allow it to run until the auto-stop function triggers at the preset pressure.
Record stop pressure: Note the displayed pressure immediately when the pump stops (Stop Pressure).
5-second hold: Wait 5 seconds without disconnecting the nozzle and record the pressure again (Stop+5 s Pressure).
Calculate retention delta: Stop+5 s Pressure − Stop Pressure = Retention Delta (差值保压).
Calculate accuracy delta: Stop+5 s Pressure − Preset Pressure = Accuracy Delta (差值精度).
Repeat for all 10 prescribed inflation segments.
Acceptance criterion: Accuracy delta must remain within the product specification tolerance; all observations and anomalies recorded in the Remarks column.

Test Data & Results

No.	Object	Inflation Range (PSI)	Preset Pressure (PSI)	Stop Pressure (PSI)	Stop+5 s Pressure (PSI)	Retention Delta (PSI)	Accuracy Delta (PSI)
1	Basketball	0–3	3	2.7	2.6	−0.10	−0.40
2	Basketball	3–6	6	5.4	5.4	0.00	−0.60
3	Basketball	6–8	8	7.6	7.6	0.00	−0.40
4	Basketball	8–9	9	8.6	8.6	0.00	−0.40
5	Basketball	0–4	4	3.6	3.6	0.00	−0.40
6	Basketball	4–6	6	5.7	5.6	−0.10	−0.40
7	Basketball	0–5	5	4.7	4.6	−0.10	−0.40
8	Basketball	5–7	7	6.8	6.7	−0.10	−0.30
9	Basketball	7–8	8	7.8	7.7	−0.10	−0.30
10	Basketball	8–9	9	8.7	8.6	−0.10	−0.40

Observations: All 10 runs show the pump stopping slightly below the preset value (−0.30 to −0.60 PSI accuracy delta), which is consistent with conservative auto-stop calibration. Short-term pressure retention after 5 seconds is excellent, with losses of 0.00 to −0.10 PSI in 7 of 10 runs and 0.00 PSI in 4 runs, indicating minimal valve leakage at the nozzle connection point. The largest single accuracy deviation (−0.60 PSI) occurred on run 2 at a 6 PSI target following a 3–6 PSI fill segment. No anomalies or failures were noted in any run.

Conclusion

Item	Detail
Test Subject	ETENWOLF S0-1# Portable Pump — Basketball Accuracy
Pressure Range	0–9 PSI
Accuracy Delta Range	−0.30 to −0.60 PSI (all negative, consistent under-stop)
Retention Delta Range	0.00 to −0.10 PSI over 5 seconds
Total Runs	10
Anomalies	None
Verdict	PASS — Auto-stop and pressure retention performance within acceptable tolerance for basketball inflation across the full 0–9 PSI operating range

Document Information

Role	Name (Pinyin)	Details
Internal Code / Project Ref	—	BTK
Source Workbook	—	S0 精度测试-2025.8.4.xlsx
Sheet Name	—	S0-1#-蓝球
Sheet Index	—	2 of 4
Author (Article)	Daniel Wright	daniel.wright

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF S0 pump when inflating a basketball?

In testing, the S0-1# unit stopped within 0.30 to 0.60 PSI below each preset target across a 0–9 PSI range. This means the pump consistently applies a slightly conservative auto-stop, leaving the ball marginally under the set value rather than over-inflating it.

Does the ETENWOLF S0 hold pressure after the pump stops inflating a basketball?

Yes. Across 10 test runs, the pressure loss in the 5 seconds immediately after the pump stopped ranged from 0.00 to 0.10 PSI, indicating very low short-term leakage at the nozzle connection.

What is the working pressure range of the ETENWOLF S0 for basketball inflation?

The accuracy test covered a 0–9 PSI operating range for basketball use, split across 10 incremental segments. All segments completed successfully with no anomalies recorded.

How does the S0-1# basketball result compare to other S0 test configurations?

The S0 was also tested on mountain bike tires and in a second unit configuration (S0-2#). See the related test reports below for side-by-side comparison across object types and unit samples.

Inflation Tools