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12.5 Calibration (Changing the Factory Default
Calibration Values)
Procedure
KEY
LOCK
SEC RANGE
POWER
IM 704610-01E
Display 2
Display 1
ns ms
s
%
V
%/
S
Note
When calibration completes normally, new calibration values are obtained. To apply the
calibration values obtained through this operation, you must change the factory default
calibration values. If you change the factory default calibration values, you cannot undo the
changes. Please confirm that it is okay to change the factory default calibration values
beforehand. Note that initialization (see section 11.2) will not set the calibration value back to
factory default.
The operations mentioned below should be carried out in the following cases:
• When the allowable range is exceeded in the performance test described in
section 12.6.
• When parts of the TA220 have been replaced.
Before starting calibration, remove all cables connected to the instrument (both
input and output) other than the power cable and communication cable. Make
sure that the TA220 is not in remote mode at this point.
For the procedure in switching from remote mode to local mode, see section 8.2 or section
9.1.
Starting in Maintenance Mode
1.
Check that the power switch is turned OFF.
2.
Hold down SCALE and turn ON the power switch (press POWER ). Hold
SCALE down for approximately three seconds. When the power switch is turned
ON, the model name and results of each test are displayed on Display 2 (model
name -> EQ board -> MEMORY -> ETHER, and so on). At this point the
instrument enters maintenance mode, and TESTMODE is displayed on Display
2.
Let the TA220 warm up for at least thirty minutes in this condition.
L.MARK
R.MARK
DISP OFF
MEASURE
E2T
JUDGE
PW
GO
BD x1
D to C
NO-GO
GATE TIME
DELAY
BLOCK
MEDIA
FUNCTION
ARMING
INHIBIT
SHIFT
SHIFT
REMOTE
STORE
UTILITY
10%
RECALL
ENTER
LOCAL
20%
JDG LEVEL
LEVEL
COUPLE
EQ BOOST
S
POLARITY
IMPEDANCE EQUALIZER
TRIG
50 Ω
1M Ω
AUTO
MAN
CONV
SEC RANGE
SCALE
12
12-9
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