USB I/O — LOAD AND STATE TEST RECORD
Plan low-voltage bench checks using the exact device manual. This form does not authorize
mains work or safety-critical control.
Module model / hardware revision / serial / manual URL and version:
Driver / firmware / host OS / USB hub and cable:
Output topology / terminal map / external supply needed:
Load type / supply min-max V / normal A / inrush A and duration:
Inductive suppression method / manufacturer reference / release-time effect:
On resistance or drop / off leakage / channel and total limits:
Isolation function and ratings / source section:
Required inactive state / reason / feedback signal:
Illustrative only: 12 V, 1000-ohm 0.5 W resistor, 1-ohm switch -> I = 12/1001 = 0.01199 A;
resistor power about 0.144 W; switch drop about 0.012 V. Check actual ratings and derating.
For every test write required state, observed physical state, delay, pass/fail, evidence
file:
1. Power before software:
2. On and off commands:
3. Normal application close:
4. Application failure:
5. USB cable loss:
6. Hub power loss:
7. Reconnection and reinitialization:
8. Other outputs unchanged during a command:
Readback meaning: register / actual output / independent load sensor:
Unmet requirement / hardware or software corrective action / retest:

Yenra | Updated September 10, 2026
Article and explanation: https://yenra.com/usb-data-acquisition/module.html

Source references (use exact equipment/material documents for actual work):
https://digilent.com/shop/mcc-usb-erb-series-electromechanical-relay-usb-devices/
https://files.digilent.com/manuals%2FUM9810-17.pdf
https://files.digilent.com/manuals/USB-ERB08.pdf