8250A Optical Power Meter Operation Manual
4.6.3 TQ8215 Compatibility
4-34
Mantissa and Exponent
Number of display digits
In the TQ8215 compatible mode, the number of display digits is set to 4 1/2 as the initial value.
The number of display digits can be set to 5 1/2.
Unit display
Range
Mantissa
Number of
characters
Exponent
Number of
characters
W
20 nW
dd.ddd
7
E-9
3
200 nW
ddd.dd
E-9
2000 nW
d.dddd
E-6
20
W
dd.ddd
E-6
200
W
ddd.dd
E-6
2000
W
d.dddd
E-3
20 mW
dd.ddd
E-3
200 mW
ddd.dd
E-3
RATIO(W)
00d.dd
E
0 to 9
dBm(dBr)
2,000 counts or more in the W
unit display.
ddd.dd
E+0
Between 500 and 1,999 counts in
the W unit display.
E+0
Between 50 and 499 counts in the
W unit display.
E+0
Less than 50 counts in the W unit
display.
E+0
Unit display
Number of
display digits
Mantissa
Number of
characters
Initial
value
W
RATIO
5 1/2
8
4 1/2
7
3 1/2
6
dBm
dBr
5 1/2
ddd.ddd
8
4 1/2
ddd.dd
7
3 1/2
ddd.d
6
2
3