In computer graphics and CAD peripherals, plotter accuracy is typically specified using repeatability and which other metric?

Introduction / Context:
Plotters and large-format printers must place the pen or print head at precise positions. Vendors therefore advertise accuracy using two complementary metrics: repeatability (how closely the device can return to the same commanded point) and resolution (the smallest addressable increment along an axis). Knowing both helps engineers judge line quality, text legibility on drawings, and overlay alignment in technical plots.

Given Data / Assumptions:

• The device is a plotter used for engineering drawings or graphics.
• “Accuracy” in practice is communicated with repeatability and resolution specifications.
• Other specs such as buffer size or intelligence (onboard processing) affect throughput, not geometric precision.

Concept / Approach:
Repeatability measures positional consistency; resolution is the step size of movement or addressable dot pitch (e.g., 0.025 mm or 1016 dpi). A device may have fine resolution but poor repeatability due to mechanical backlash; conversely, high repeatability with coarse resolution limits detail. Both are required to achieve clean, accurate plots, especially on multi-layer drawings where lines must coincide exactly.

Step-by-Step Solution:
Isolate the metrics that directly impact geometric placement: repeatability and resolution.Eliminate metrics related to capacity (buffer size) or control (intelligence) that do not set physical placement capability.Choose “Resolution” as the counterpart to repeatability.

Verification / Alternative check:
Manufacturer datasheets invariably provide both repeatability (e.g., ±0.1 mm) and resolution (e.g., 0.025 mm step or 1200 dpi) to characterize plotting precision.

Why Other Options Are Wrong:
Vertical dimension is not a standard accuracy metric; buffer size and intelligence affect performance, not positional accuracy.

Common Pitfalls:
Confusing “accuracy” with “resolution”—a device can place very small steps (fine resolution) yet still be inaccurate if backlash or calibration errors exist.

Final Answer:
Resolution.