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Model 4277A
SECTION III
NUMBER OF DISPLAY DIGITS
Tables J_ through 12 show the number of significant digits displayed for each of the
4277A's measurement parameters.
The three-number combinations given in the tables
indicate the number of display digits for the respective measurement range and test
frequency for each measurement speed.
For example, if MED measurement speed is
selected, use the middle number? if FAST is selected, use the right most number.
X, X, X (display digits)
SLOW
MED
FAST
The number of display digits is defined as follows:
4 digits
to
1. o
t? O D ■
1
D
D ~i
■
3 digits
t~i i~i i~i
1
u
1
to
)
O /Tf
H
1
D
H
2 digits
n n
_
U U
to
/ o
1
■
1 digits
1
P
O Q
to
A full-scale factor is used in Figure A through Figure N. It is defined as follows:
Full-scale factor = (measured value v full-scale value) of C, L, or I Z |
For example, when the measured C value is 9.5nF on the lOnF range, full-scale factor is
0.95.
/-SA SELECT SW
S 1
BID
r~Bi
To obtain more display digits on ranges where
the number of display digits is less than 3-1/2,
set the SA SELECT switch (SI) on the A1 (logic)
board as shown in the figure. However, display
fluctuation will be more than that in normal
operation.
The setting of this switch can be
changed only when the instrument is turned off.
Figure 3-4. Measurement Ranges and Number of Display Digits (Sheet 1 of 16).
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