Tandy 1000 SL Technical Reference Manual page 456

3-4-11. Check of Resolution
( A )
Equipment
(11
Level d i s k
( 2 ) SKA or u s e r ' s system
( 3 ) O s c i l l o s c o p e ( n o t r e q u i r e d when an SKA i s used)
(B-1) Check procedure (General method)
(1) U s e two channels of an o s c i l l o s c o p e and connect them t o TP4 and TP5
(Pre-amp. 1 on t h e PCBA MFD c o n t r o l .
O s c i l l o s c o p e range: AC mode, 2 O m V
-
0.1V
S e t both channels,
1
and 2 t o t h e above range. S e t e i t h e r of t h e
channels t o I n v e r t mode and Add both channels.
( 2 ) I n s t a l l a l e v e l d i s k and s t a r t t h e s p i n d l e motor.
( 3 ) S e t t h e head t o t h e innermost t r a c k .
(4) Execute t h e head loading.
(5) Execute 1F w r i t e o p e r a t i o n f o r one r o t a t i o n of t h e d i s k (125KHz of
WRITE D A T A frequency for FD-ssBR/FR and 250KHz f o r FD-55GR).
(6) Measure t h e average amplitude (VlF) a s i n Fig.3417.
(7) Execute 2F w r i t e o p e r a t i o n l i k e i n i t e m (51, doubled i n frequency t o
t h a t i n i t e m (5).
( 8 )
Measure t h e average amplitude (V2F) as i n Fig.3417.
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3444
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