Uses for the Square wave fixed frequency output on DMMs?

[kalel]

I asked previously about some uses of the manual hold button.

This time, I would like to ask about the fixed frequency output "square wave" function of multimeters. Usually it's a fixed 50 Hz with 0.5 duty cycle. At least a few meters offer it, starting from the famous DT series.
What could this function be used for? In case it's only available on cheap multimeters, I would assume it's not designed especially as a kind of test signal for a scope, plus it likely wouldn't make a good/accurate one anyway.
I'm not sure if there's enough power to test with any LEDs or beepers. Maybe for testing simple transistor amplification circuits? If you only have a transistor, an LED and no other source for the gate signal, perhaps it makes sense. Maybe there's no specific intention, but I imagine this could have more uses than the manual hold button.

[alm]

Given that it is only found on cheap meters, unlike the hold button, I am not so sure about the more useful part . I can only see it being useful if you have some other meter or scope to observe the output of your circuit.

[WhichEnt2]

I heard once that it function being used for checking the segments on the liquid crystal displays or something.

[bjcuizon]

Maybe it is for testing some kind of audio device. I tried using it to test some audio amp and it outputs something like the 50Hz mains hum (like when you plug in a guitar cable for example.)

[BU508A]

Given that it is only found on cheap meters, unlike the hold button, I am not so sure about the more useful part . I can only see it being useful if you have some other meter or scope to observe the output of your circuit.

I would not consider the Agilent U1252B as a "cheap meter".

[Electro Detective]

Whatever priced meter it's on, it would be handy as a go / no-go speaker tester, or certain mf types of capacitors ? 

[jpb]

I would not consider the Agilent U1252B as a "cheap meter".

It is not, but it does not have a fixed frequency, fixed duty cycle square wave output. Its square wave output is variable in frequency and duty cycle so could be used with pwm circuits.

Some cheap meters, apparently, have just one fixed frequency 50% duty cycle output which is rather less useful and I suspect is more a marketing thing so it looks like they have the same as more expensive meters.

[Fungus]

I would not consider the Agilent U1252B as a "cheap meter".

It is not, but it does not have a fixed frequency, fixed duty cycle square wave output. Its square wave output is variable in frequency and duty cycle so could be used with pwm circuits.

Some cheap meters, apparently, have just one fixed frequency 50% duty cycle output which is rather less useful and I suspect is more a marketing thing so it looks like they have the same as more expensive meters.

I suspect the OP is talking about the new AN8008, which isn't fixed frequency.

[kalel]

I would not consider the Agilent U1252B as a "cheap meter".

It is not, but it does not have a fixed frequency, fixed duty cycle square wave output. Its square wave output is variable in frequency and duty cycle so could be used with pwm circuits.

Some cheap meters, apparently, have just one fixed frequency 50% duty cycle output which is rather less useful and I suspect is more a marketing thing so it looks like they have the same as more expensive meters.

I suspect the OP is talking about the new AN8008, which isn't fixed frequency.

Actually I was talking about the fixed frequency ones (I have a DT with that function, never found much use for it), but as for AN8008, it's a shame it doesn't offer a temperature setting like AN8002.

[Fungus]

as for AN8008, it's a shame it doesn't offer a temperature setting like AN8002.

I think it can be hacked to enable it, but at that price you can have both!

[Shock]

Keysight U1252B User’s and Service Guide: Square Wave Output

The square wave output function can be used to generate a PWM (pulse width modulation) output or provide a synchronous clock source (baud rate generator). You can also use this function to check and calibrate flow-meter displays, counters, tachometers, oscilloscopes, frequency converters, frequency transmitters, and other frequency input devices.

On this specific meter you can adjust the frequency, duty cycle and pulse width.

[Crumble]

as for AN8008, it's a shame it doesn't offer a temperature setting like AN8002.

I think it can be hacked to enable it, but at that price you can have both!

I have an AN8002, but I usually use a generic TM-902C temperature meter for measuring temperature. They are just a few $, and they liberate a multimeter for the electric work. I'd recommend to get one of those.