UT804 is a 40000 count 4 3/4-digit, auto-ranging true RMS desktop digital multimeter. It features a full-function analog bar graph display, full-range overload protection, and dual power supply mode (battery and AC power), making it a high-precision electrical measurement instrument with superior performance. This meter can be used to measure: true RMS AC or (AC+DC) voltage and current, DC voltage and current, resistance, diode, circuit continuity, capacitance, frequency, duty cycle, temperature, (4～20mA)% measurement, maximum/minimum value, relative measurement, etc. It also has white backlight, user settings, RS232 and USB data transfer, 9999 data storage, data hold, low battery indication and auto power off function when powered by battery.
This manual introduces the UNI‑T UT804 digital multimeter, covering safety work rules, international electrical symbols, comprehensive specifications and the physical layout of the instrument. It also details the functions of the knobs, buttons, LCD display and measurement modes such as voltage, current, resistance, capacitance, frequency, duty‑cycle and temperature.
Additional sections describe the RS232C and USB interfaces, battery and fuse replacement, and maintenance guidelines. The document is organized with a table of contents, clear diagrams, and step‑by‑step procedures for safe and accurate measurements. This manual is written in Chinese.
| Display Digits | 40000 count (4 3/4 digits) |
|---|---|
| Operating Temperature | 0 °C ~ 40 °C |
| Storage Temperature | -10 °C ~ 50 °C |
| Dimensions | 105 × 240 × 310 mm |
| Weight | ≈3 kg |
| Power Supply | AC 220 V ± 10 %/50 Hz or 2×AA batteries (R14) |
| Safety Standards | IEC 61010, CAT I 1000 V, CAT II 600 V; UL |
Replace the internal AA batteries immediately to maintain measurement accuracy.
It complies with IEC 61010, CAT I 1000 V, CAT II 600 V, and UL safety standards.
Disconnect all power sources, discharge capacitors, and ensure the instrument’s fuse is intact before connecting the probes.