In this post, I will review a nice multimeter by TENMA, model 72-7735.
This is an advanced autoranging multimeter(!) that lets you measure the following electrical properties:
- AC voltage 0V to 1000 V
- DC voltage 0 V to 750 V
- Resistance 0 Ohm – 40 MOhm
- Capacitance 0 nf to 100 uF
- Frequency 0 Hz to 10Mhz
- AC or DC current 0 uA to 4000 uA
- AC or DC current 0 mA to 400 mA
- AC or DC current 0 A to 10 A
- Diode test
- Continuity test
And here is the multimeter itself :
The box contains the following items :
- TENMA 72-7735 Multimeter
- 9V battery
- Test leads – 5 feet long
- Test leads with alligator clips – 6 inches long
- Operating Manual
- RS232C interface cable
- CD-Rom with software to program the multimeter through the interface cable
Here is a picture of the contents of the box(click to zoom in):
The multimeter has a great design that feels sturdy and solid, but also ergonomic and minimally simple. In my opinion this multimeter is very well designed and practical.
One cool feature of it is that it has a stand so that you can put it up on the table in a way that you don’t have to bend over to view the results of the measurements.
Taking the measurements is very straightforward, turn the multimeter on, switch to what electrical property you want to measure and apply the leads to your subject. For example I test my AA batteries with a multimeter, if the voltage is below 1.2 V that means the battery has not much juice left in it. In the picture below I am showing you a result of measuring a brand new Duracell battery:
As you can see, the multimeter got the results right to the specifications.
The 72-7735 has autoranging functions, meaning you don’t have to know the range of the property that you want to measure. In the old multimeters this was pretty involved process – they would have many ranges for each property – V, A, Ohms, etc and you would have to find the right range for your measurement and sometimes that would take a while when the subject has unknown quantity. In this case the multimeter is smart enough to figure out the range automatically and apply the necessary protection and switching to the correct range. But it is not limited to autoranging, you can press the range button and select the range that you would like. I don’t know what the advantages of the auto range would be, in all of my experiments the auto range was sufficient and smart enough to guess the range for me.
Another great feature of this multimeter is the HOLD button.
It allows you to lock the measurement so that when you disconnect the object being measured you still will be able to see the measurement.
I have tested the multimeter with resistance, capacitance, voltage and current.
The multimeter is precise and responsive, well within specifications.
A couple of small things I have found inconvenient in this multimeter is the design of the metal part of the lead, I personally prefer a little longer metal part sticking out and this multimeter comes with leads that have the metal parts pretty small, probably to protect the user from the high voltage or high current and to avoid electric shock accidents. Another thing is that for capacitance and resistance it could take some time to get the measurement while the multimeter is probing different ranges.
While some people don’t need a multimeter, I think that every man should own one. I use mine for battery testing, and for all of my electronics projects.
Here is a list of things you could do with a multimeter like this:
- Arduino projects – frequency meter, voltage and amperes measurement, resistance and capacitance measurements
- Home improvement projects
- Electronics – pretty much all electronics projects need a multimeter to test things
- Electrics around the house – testing fuses and electrical outlets (the meter is protected and the test leads can handle the voltage)
- Wire connectivity testing
The TENMA, model 72-7735 multimeter is very good at what it is supposed to do, measuring electrical properties. It is very well designed, ergonomic and easy to work with, its durable construction guarantees many years of work and the simplicity of the functions guarantees not to have you confused about how to measure properties with it.
Documentation - http://www.farnell.com/datasheets/1692903.pdf
Link to the product – http://www.newark.com/tenma/72-7735/multimeter-digital-handheld/dp/02J5540