Hitachi 902 Service Manual page 53

No. Data Alarm
Linearity
abnormal
Number of
photometric
points in reaction
limit level range ≥
9
4 ≤ Number of
photometric
points in reaction
limit level range ≤
8
Printer S. I/F
(Photometry assay only)
In 1-point & rate, rate-A or
LIN. W
rate-B assay, the absorbance
at each photometric point to
be used for calculation of the
absorbance change rate does
not satisfy the following
relational requirement.
∆ E
≤ Linearity limit value
LIN. 8 F
Where, ∆E: Absorbance
change rate determined from
absorbance at each
photometric point in reaction
limit level range by least
squares method
∆E
rate in first half
∆E
rate in second half
Assuming that the number of
photometric points in the
reaction limit level range is N,
∆E
value can be represented as
shown below.
(1) When N ≥ 9
Description
− ∆E
× 100
1 b
∆E
: Absorbance change
1
: Absorbance change
b
, ∆E
and linearity limit
1 b
Linearity limit
value LIMIT 8
∆E f
∆E
2 - 41
Remedy
• Make sure the sample
does not contain dust,
etc.
• Dilute the sample and
measure it again.
• If the stirring motor does
not rotate normally,
report to the
servicemen.
• The light source lamp
should not be used
beyond 750 hours.
• Replace the light source
lamp and perform cell
blank measurement.
LIMIT8 and LIN.LIMIT
values are both fixed.
(Unit: %,
value: LIN.LIMIT = 10,
LIMIT8 = 30)
b
(cont d)
'