Tenma 72-7750

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Tenma 72-7750
Tenma 72-7750.png
Status in progress
Counts 6000
IEC 61010-1 CAT III (1000V) / CAT IV (600V)
Connectivity RS232 / USB
Measurements voltage, current, resistance, capacitance, frequency, duty cycle, temperature, diode, continuity
Features autorange, true-rms, data hold, relative, backlight
Website mcmelectronics.com

The Tenma 72-7750 is a 6000 count CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

It is a rebadged UNI-T UT60G.

See Tenma 72-7750/Info for more details (such as lsusb -v output) about the device.

Hardware

  • Multimeter IC: Cyrustek ES51986A (markings: "cyrustek.com.tw ES51986A 1216-GH91")
  • Low-power JFET dual operational amplifiers: ST TL062C (markings: "ST 062C eZ048") (datasheet)
  • Crystal: 4MHz (markings: "3.999")
  • Fuses: F500mA/250V, F10A/H250V (both are glass fuses)
  • Random PCB silkscreen markings: "TRMS", "2008.12.10", "0604026"

RS232 cable:

USB cable:

Photos

Multimeter:

RS232 cable:

See Device cables#UNI-T_UT-D02.

USB cable:

See Device cables#UNI-T_UT-D04.

Protocol

See Multimeter ICs/Cyrustek ES519xx for the DMM IC protocol. Depending on the cable, additional transport-specific decoding is needed, though.

Resources