Tenma 72-7730¶


Status	supported
Source code	serial-dmm
Counts	20000/2000
IEC 61010-1	CAT III (1000V) / CAT IV (600V)
Connectivity	RS232 / USB
Measurements	voltage, current, resistance, capacitance, frequency, temperature, duty cycle, diode, continuity
Features	autorange, true-rms, data hold, relative, backlight
Website	mcmelectronics.com

The Tenma 72-7730 is a 20000/2000 count CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.

It is a rebadged UNI-T UT71-B.

See UNI-T UT71x series for information common to all devices in this series.

Hardware¶

Multimeter:

44000/440000-count dual-slope ADC: Cyrustek ES51966P (datasheet)
16-bit microcontroller: Texas Instruments MSP430F149 (markings "TI 14AH00W G4 LSD0007 REV S") (datasheet)
128 (32 x 4) pattern multi-function LCD driver': Holtek HT1621B (datasheet)
PCB markings: The silkscreen reads "71A V20051010-8", but the correct "B" model indication is apparently added manually by UNI-T using a a sharpie and a sticker.