Debounce button for externally triggering DMM

[radioFlash]

I'd like to to have a simple pushbutton to trigger my multimeter to take readings. I hooked up a scavenged snap action switch, wired it to the EXT trigger, and lo and behold, I get 2-3 readings per button press. So, it looks like I need to debounce it. Is the simplest/best strategy something like Fig 3 suggested at http://www.ganssle.com/debouncing-pt2.htm ?

[Alex Eisenhut]

Yeah but now you need a power supply. Does the DMM have a pull up of some sort? You could just whack a capacitor across your switch to create a RC filter, and you might need a diode to clip negative-going signals.

What DMM is this?

[radioFlash]

It's a Keysight 34665a. The trigger is normally high at about 2.9 V and seems to have an impedance of 100k. I tried a 0.1 uF cap across the switch, and it's working nicely.
Thanks for the suggestion!

Edit:
Added oscillocope screen shot of triggering using the switch with and without the capacitor.