SM010-3 Siemens SD 270 Operating & Service Manual Page 51
calibration menu using the PHONES key on the audiometer. Press
Softkey 1 or Softkey 2 as required (the selected option will be indicated)
and then press QUIT to return to the calibration menu.
The secondary headphone may then be calibrated (only air conduction
tone, speech & masking functions are required).
Refer to Appendix 7 if it is required to enable a secondary headphone.
4
Output Levels in Calibration
The levels output when in calibration mode are given below for reference.
Air Conduction
Bone
Conduction
Masking
Insert
Frequency
P
u
re
to
n
e
N
B
N
o
is
e
S
p
e
e
c
h
W
B
N
o
is
e
P
u
re
to
n
e
N
B
N
o
is
e
125
50
30
250
70
50
30
70
500
70
70
40
70
750
70
70
40
70
1000
70
70
40
70
1500
70
70
40
70
2000
70
70
40
70
3000
70
70
40
70
4000
70
70
40
70
6000
70
70
40
*
8000
70
70
30
*
N/A
80
70
* These levels should be left uncalibrated at zero.