Tenma 72-7750
Revision as of 20:54, 3 January 2014 by Uwe Hermann (talk | contribs)
 | |
| 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:
PCB, top
PCB, bottom
RS232 cable:
See Device cables#UNI-T_UT-D02.
USB cable:
See Device cables#UNI-T_UT-D04.
Protocol
See Multimeter_ICs#Cyrustek_ES51978 for the DMM IC protocol. Depending on the cable, additional transport-specific decoding is needed, though.