PMU Needle Configuration & Machines 3 — Questions and Answers
Question 1: In PMU machine terminology, 'Hz' refers to:
- Needle sharpness rating
- Number of needle cycles per second (frequency) (Correct answer)
- Horizontal stroke calibration
- Handpiece impedance
Correct answer: Number of needle cycles per second (frequency)
Hz (hertz) measures how many times per second the needle completes a full up-and-down cycle, affecting implantation speed.
Question 2: Which needle configuration is LEAST appropriate for creating fine, hairlike eyebrow strokes?
- 1RL (single round liner)
- 3RL (3-needle round liner)
- 14F flat needle
- Curved 5M magnum (Correct answer)
Correct answer: Curved 5M magnum
A curved magnum is a wide shading configuration unsuitable for fine hairstrokes, which require narrow, precise liners.
Question 3: What is the function of a needle cartridge's membrane in modern PMU handpieces?
- Regulates pigment flow into the needle
- Acts as a back-flow prevention barrier to protect the machine (Correct answer)
- Controls needle protrusion depth automatically
- Filters pigment for even color
Correct answer: Acts as a back-flow prevention barrier to protect the machine
The membrane inside a needle cartridge prevents blood and bodily fluids from traveling back up into the machine body, maintaining hygiene.
Question 4: A flat needle (F) configuration differs from a round liner (RL) primarily because flat needles are:
- Soldered in a single straight row (Correct answer)
- Arranged in a circular tight cluster
- Stacked in two parallel rows
- Individually mounted without soldering
Correct answer: Soldered in a single straight row
Flat needles are arranged in a single straight horizontal row, producing a consistent line width suited for brow and liner work.
Question 5: When selecting needle protrusion length, a more superficial application (e.g., skin tone correction) requires:
- Maximum protrusion to reach the dermis
- Shorter protrusion to stay within the epidermis/upper dermis (Correct answer)
- The same protrusion as lip blushing
- No adjustment; protrusion is fixed on all machines
Correct answer: Shorter protrusion to stay within the epidermis/upper dermis
Superficial corrections target only the uppermost skin layers, so minimal needle protrusion reduces risk of over-implantation.
Question 6: Which characteristic best describes a 'shader' needle group used in PMU?
- Tightly packed needles for concentrated ink lines
- Needles spread apart to deposit pigment over a broader area (Correct answer)
- Single needle for pixel-by-pixel work
- Needles configured for maximum penetration depth
Correct answer: Needles spread apart to deposit pigment over a broader area
Shader configurations space needles farther apart, allowing pigment to be diffused across a wider skin area for soft, filled effects.
Question 7: A digital PMU machine's LCD display typically allows the artist to adjust which parameters?
- Pigment viscosity and temperature only
- Voltage/speed and sometimes stroke length (Correct answer)
- Needle brand and gauge automatically
- Studio lighting and magnification
Correct answer: Voltage/speed and sometimes stroke length
Most digital rotary machines let the artist set voltage (controlling speed) and on advanced models, stroke length, for precise technique control.
PMU Needle Configuration & Machines 3
In PMU machine terminology, 'Hz' refers to: