We use the Upgraded Giant Metrewave Radio Telescope to measure scintillation
arc properties in six bright canonical pulsars with simultaneous dual frequency
coverage. These observations at frequencies from 300 to 750 MHz allowed for
detailed analysis of arc evolution across frequency and epoch. We perform more
robust determinations of arc curvature, scattering delay, and scintillation
timescale frequency-dependence, and comparison between arc curvature and
pseudo-curvature than allowed by single-frequency-band-per-epoch measurements,
which we find to agree with theory and previous literature. We find a strong
correlation between arc asymmetry and arc curvature, which we have replicated
using simulations, and attribute to a bias in the Hough transform approach to
scintillation arc analysis. Possible evidence for an approximately week long
timescale over which a given scattering screen dominates signal propagation was
found by tracking visible scintillation arcs in each epoch in PSR J1136+1551.
The inclusion of a 155 minute observation allowed us to resolve the scale of
scintillation variations on short timescales, which we find to be directly tied
to the amount of ISM sampled over the observation. Some of our pulsars showed
either consistent or emerging asymmetries in arc curvature, indicating
instances of refraction across their lines of sight. Significant features in
various pulsars, such as multiple scintillation arcs in PSR J1136+1551 and flat
arclets in PSR J1509+5531, that have been found in previous works, were also
detected. The multiple band capability of the upgraded GMRT shows excellent
promise for future pulsar scintillation work