UM25 Manual Working Summary

This note summarizes the imported manual UM25 User Manual.pdf as a working reference for the project.

Source Snapshot

• imported file: Documentation/Research Resources/Manuals/UM25 User Manual.pdf
• source filename: 98c297e2b477494d7de0babe2b77877749c3.pdf
• model label in manual: UM25/UM25C
• manual date: 2019.9.24
• pages: 27
• creator metadata: WPS 文字
• SHA-1: 518898c297e2b477494d7de0babe2b77877749c3

Why This Source Matters

Compared with the previously imported UM34C PDF, this manual is a cleaner product reference for UM25/UM25C.

Confirmed scope improvements:

• the title page explicitly says UM25/UM25C
• the table of contents includes Android app, iOS app, and PC control software sections
• the technical parameter block is internally consistent with UM25/UM25C

Confirmed Device Capabilities

• color LCD display: 1.44 inch
• measurement ranges:
  • voltage: 4-24.000 V
  • current: 0-5.0000 A
  • capacity: 0-99999 mAh
  • energy: 0-99999 mWh
  • temperature: -10 C to 100 C
• measurement resolutions:
  • voltage: 0.001 V
  • current: 0.0001 A
• accuracy claims:
  • voltage: ±(0.5‰ + 2 digits)
  • current: ±(1‰ + 4 digits)
• refresh rate: 2 Hz
• quick-charge recognition claims support for:
  • QC2.0
  • QC3.0
  • Apple 2.4A / 2.1A / 1A / 0.5A
  • Android DCP
  • SAMSUNG

Hardware and UI Notes

• hardware layout includes:
  • Micro USB port
  • USB-A female port
  • USB-A male port
  • Type-C input port
  • Type-C output port
  • Bluetooth switch
  • Bluetooth indicator
• the manual says both Type-C ports expose only VBUS, GND, CC1, and CC2
• the interface model is the same six-page pattern seen in related manuals:
  • main measurement
  • quick-charge recognition
  • charging record
  • cable impedance measurement
  • graphing
  • system settings

Measurement and Storage Behavior

• the main screen shows voltage, current, power, temperature, accumulated mAh, accumulated mWh, load impedance, and active data-group index
• the device provides 10 data groups: 0-9
• groups 1-9 persist accumulated mAh and mWh across power cycles
• group 0 is temporary and resets once accumulation resumes past 1 mAh
• holding PREV clears the active group totals

Recording and Cable Testing

• recording starts automatically when current rises above the configured low-current trigger
• trigger range: 0.01 A to 0.30 A
• graphing includes:
  • voltage/current over time
  • D+ / D- voltage over time
• cable resistance mode uses a two-step differential measurement:
  1. measure directly at the charger under load
  2. repeat through the cable under test at the same load

Practical notes from the manual:

• recommended cable-test load is approximately 1 A
• if voltage drop is too high, the tester can power down near 4 V
• the tester must be power-cycled after cable-resistance measurement to resume normal mode

Settings

• auto screen-off: 0-9 min
• brightness: 0-5
• temperature unit: C / F
• theme background color
• theme foreground color
• hidden boot menu options:
  • Chinese UI
  • English UI
  • reset settings

Android App Notes

Confirmed from the manual:

• minimum Android version: 5.0
• app distribution:
  • vendor MediaFire folder for UM25
  • Google Play search term: UM Meter
• pairing code: 1234
• app features include:
  • Bluetooth connection
  • export to phone storage
  • sharing exported files to other apps
  • multi-language UI
  • voltage/current graph
  • quick-charge mode display
  • D+ / D- voltage display
  • brightness and screen-off adjustment
  • temperature-unit switching
  • data-group switching
  • data-group clearing
  • screen rotation
  • low-current trigger adjustment

iOS App Notes

Confirmed from the manual:

• minimum iOS version: 8.0
• App Store search term: UM Meter
• workflow described by the manual:
  • tap Find to discover nearby Bluetooth devices
  • connect to the device
  • enter data communication
  • export form files
  • share exported files to other apps
  • select language in the personal center
• manual states the iOS app version matching the document is 1.2.1

PC Software Notes

• explicitly labeled for UM25C
• supported OS: Windows 7 and above
• manual references PC package UM25C PC Software V1.3.zip
• manual says to install Arial Unicode MS before unzipping/installing
• PC connection flow:
  • enable device Bluetooth
  • pair from Windows
  • inspect Bluetooth COM-port assignment
  • use the outgoing COM port labeled for UM25C
  • connect once the tester Bluetooth indicator becomes steady

Important PC notes from the manual:

• prefer the Windows built-in Bluetooth driver, not the adapter vendor driver
• after power-cycling the tester, select the COM port again
• do not press tester buttons during communication because error data may appear
• exported graph data is intended for Microsoft Office Excel

Relevance for This Project

Useful as a product-behavior reference:

• confirms UM25/UM25C as a distinct documented model family
• confirms the same six-page device UI model used in related manuals
• confirms app-visible concepts we may need to represent in our model:
  • active data group
  • quick-charge mode
  • D+ / D- levels
  • graph pages
  • low-current trigger
  • brightness and screen-off settings
• confirms that UM25C had vendor-supported Android, iOS, and Windows software

Important transport caveat:

• the PC section clearly describes Bluetooth COM-port use, which fits serial-port style communication on Windows
• the imported DX-BT18 module manual shows one plausible way this can coexist with iOS support: the module can expose SPP-style workflows for desktop while also supporting BLE for iOS
• for implementation, exact module identity is still not fully proven, but the current FFE0 / FFE1 transport assumption is now much better supported

Relationship to Current App Scope

• UM24 classic-Bluetooth serial support remains out of scope for this application
• this manual makes UM25C a higher-priority reference than UM24C for supported-device investigation
• the C variants remain the main target family until runtime evidence suggests otherwise

Open Questions

• whether UM25C uses one Bluetooth mode for Android/Windows and another for iOS
• whether the iOS app talks to the same payload structure as Android and PC software
• whether UM34C and UM25C share identical transport and field mappings