Oscilloscope Digital Multimeter
How to check signals of Rotary Encoder with a digital multimeter as we donot have oscilloscope at working site
..and if it's a quadrature-output (probably more likely) you would get alternate high-lows on each of the 2 outputs as you krank the knob. This will probably be about the best you can do (tho it should be enough) without a scope - kinda hard to check for the 90/270-degree phase relationship with just a meter unless the encoder has unusually-large steps. If it is this type, and you have a schematic, can you go to the logic that the encoder feeds? The output of the logic should have a "Direction" and a "Counts" output. "Direction" (or whatever your circuit calls it) will be high in one direction of rotation and low in the other, with pulses coming out of the Count line in both directions.
A look at what is currently available on eBay
 UT81B Oscilloscope Auto-Range LCD Digital Multimeter US1 US $183.90 
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 HDS UT81B SCOPEMETER MULTIMETER OSCILLOSCOPE DMM USB US $174.99
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 ARM Nano DSO201 Portable DSO Digital Oscilloscope DMM US $79.99
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