HTA
We strongly recommend using an alignment tool, the Brinkmann Protractor or one of the other
ĂǀĂŝůĂďůĞĂůŝŐŶŵĞŶƚƚŽŽůƐ͘dŚŝƐƐĞĐƟŽŶŽŶůLJŽīĞƌƐƌŽƵŐŚŐƵŝĚĞůŝŶĞƐǁŚĞŶƚŚĞƌĞŝƐŶŽƚŽŽůĂǀĂŝůĂďůĞ͘
The horizontal tracking angle is the same as the geometrical alignment with a good alignment tool.
dŚĞƉƵƌƉŽƐĞŝƐƚŽĂĐŚŝĞǀĞĂŶŽƉƟŵĂůĂƌĐǁŚŝůĞƚŚĞƚŽŶĞĂƌŵĂŶĚĐĂƌƚƌŝĚŐĞŵŽǀĞŽǀĞƌƚŚĞ>WĂŶĚƚŽ
minimize the tracking error as it arcs across the record.
^ŚŽƵůĚ ƚŚĞƌĞ ďĞ ŶŽ ĂůŝŐŶŵĞŶƚ ƚŽŽů ĂǀĂŝůĂďůĞ͕ ƚŚĞ ,d ƐĞƫŶŐ ĐĂŶ ďĞ ŝŵƉƌŽǀĞĚ ďLJ ĞĂƌ ƵƐŝŶŐ ƚŚĞ
following methods:
>ŽŽƐĞŶŽŶĞŽĨƚŚĞƚǁŽŵŽƵŶƟŶŐƐĐƌĞǁƐŽŶƚŽƉŽĨƚŚĞŚĞĂĚƐŚĞůůĞŶŽƵŐŚƚŽƚƵƌŶƚŚĞĐĂƌƚƌŝĚŐĞŝŶ
ŵŝŶƵƚĞ ŝŶĐƌĞŵĞŶƚƐ ŝŶǁĂƌĚ Žƌ ŽƵƚǁĂƌĚ͘ dŽ ĐŚĞĐŬ ƚŚĞ ƌĞƐƵůƚ LJŽƵ ŵƵƐƚ ƌĞͲƟŐŚƚĞŶ ƚŚĞ ƐĐƌĞǁ ĞǀĞƌLJ
ƟŵĞ͘ŚĞĐŬďLJƉůĂLJŝŶŐĂǀĞƌLJĨĂŵŝůŝĂƌƚƵŶĞĂďŽƵƚŽŶĞƚŽƚǁŽĐĞŶƟŵĞƚĞƌƐŝŶĨƌŽŵƚŚĞďĞŐŝŶŶŝŶŐŽĨ
ƚŚĞ>W͘DŽƐƚƌĞǀĞĂůŝŶŐǁŽƵůĚďĞĂƐŽůŽǀŽŝĐĞƌĞĐŽƌĚĞĚŝŶƚŚĞĐĞŶƚĞƌŽĨƚŚĞƐƚĞƌĞŽŝŵĂŐĞ͘/ĨƚŚĞǀŽŝĐĞ
ŝƐƐůŝŐŚƚůLJƚŽƚŚĞůĞŌŽĨĐĞŶƚĞƌƚŚĞĐĂƌƚƌŝĚŐĞƐŚŽƵůĚďĞƚƵƌŶĞĚĞǀĞƌƐŽƐůŝŐŚƚůLJŝŶǁĂƌĚƐƚŽǁĂƌĚƐƚŚĞ
ĐĞŶƚĞƌƐƉŝŶĚůĞ͘dŚĞŝŶĐƌĞŵĞŶƚƐŵĂLJďĞƐŽƐůŝŐŚƚƚŚĂƚƚŚĞŶĂŬĞĚĞLJĞĐŽƵůĚŶŽƚĚĞƚĞĐƚĂŶLJĐŚĂŶŐĞ͘/Ĩ
ƚŚĞƐŽƵŶĚŐĞƚƐƚŽŽƐŽŌĂŶĚƚŚĞŝŵĂŐĞƚŽŽŚĂnjLJƚŚĞĐĂƌƚƌŝĚŐĞĂƐĂǁŚŽůĞƐŚŽƵůĚďĞŵŽǀĞĚƐůŝŐŚƚůLJ
ĨŽƌǁĂƌĚ͘ŽŶƐĞƋƵĞŶƚůLJ͕ŝĨƚŚĞƐŽƵŶĚŐĞƚƐďƌŝƩůĞŝƚƐŚŽƵůĚďĞŵŽǀĞĚƐůŝŐŚƚůLJďĂĐŬ͘dŚĞƐĞĂĚũƵƐƚŵĞŶƚƐ
ƐŚŽƵůĚďĞĐŚĞĐŬĞĚĂŐĂŝŶĂŌĞƌƚŚĞĐĂƌƚƌŝĚŐĞŝƐďƌŽŬĞŶŝŶ͘WůĞĂƐĞŶŽƚĞƚŚĂƚƚŚĞƐĞƫŶŐĨŽƌĂŶƟƐŬĂƚĞ
ǁŝůůĂůƐŽƐůŝŐŚƚůLJŝŶŇƵĞŶĐĞ,d͘,ĞŶĐĞ͕ĐŚĂŶŐŝŶŐƚŚĞĂŶƟƐŬĂƟŶŐĨŽƌĐĞĂŵŽƵŶƚƐƚŽĂƐŵĂůůĂĚũƵƐƚŵĞŶƚ
in HTA.
ƩƌŝďƵƚĞƐĂŶĚƚĞĐŚŶŝĐĂůƐƉĞĐŝĮĐĂƟŽŶƐ DdͲƟͬWŝ
dLJƉĞ͗
DŽǀŝŶŐŽŝů
tĞŝŐŚƚ͗
approx. 11g / 14 grams
KƵƚƉƵƚǀŽůƚĂŐĞ͗
0,21 / 0.15mV (1cm / sec)
KƵƚƉƵƚŝŵƉĞĚĂŶĐĞ͗
25 ohm / 20 ohm
&ƌĞƋƵĞŶĐLJƌĞƐƉŽŶƐĞ͗
20Hz ... 30kHz
&ƌĞƋƵĞŶĐLJŝŶƚĞƌŵŽĚƵůĂƟŽŶ͗
< 0.5%
sĞƌƟĐĂůƚƌĂĐŬŝŶŐĂŶŐůĞ͗
23°
ƌŽƐƐƚĂůŬ͗
> 25dB (1kHz)
ŽŵƉůŝĂŶĐĞ͗
15µm / mN
^ƚLJůƵƐ͗
vdHul, radius 3µm / micro ridge, radius 3µm
dƌĂĐŬŝŶŐĨŽƌĐĞ͗
1.8 – 2g
ZĞĐŽŵŵĞŶĚĞĚůŽĂĚ͗
600 ohms
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