Assembled attachment to connect to multimeter in frequency measurement mode (for kits #1-9, 11-14). It works on all brushless motors with exposed rotating magnets.
Please note than this attachment must be connected to multimeter capable of measuring the frequency in Hz; if you do not have one you should consider RPM Measurement Kit #1.
Motor Speed Measurement page provides information on how to use this attachment for RPM measurement.
Uses four standard AA batteries (not supplied).
Additional note:It was recently discovered that while most frequency measurement devices provide satisfactory results, some of them (for example, Radio Shack 42-range multimeter) do not work well with this measurement attachment. They might be not sensitive enough, or require only clean sine/square wave signal (see customer’s review).
We found that some models can register the signal if the output is connected to a load (resistor across the alligator clips), which is now provided with stand alone attachments. However we cannot guarantee that your multimeter will work correctly even with a connected resistor.
Multimeters we sell with the full RPM Measurement Kit #1 were tested extensively and they are guaranteed to work without any additional circuitry.