9-8
IM 704420-01E
Explanation
If a problem is detected during the self-test, please contact your nearest YOKOGAWA
dealer as listed on the back cover of this manual for repairs.
Signal cable
When performing self-test, remove all cables that are connected to the TA120E (input
and output cables) excluding the power cable and GP-IB cable. If the TA120E is in
the remote mode at this point, self-test cannot be performed. Switch from remote
mode to local mode.
Key and rotary knob test
When you press a key or turn the rotary knob, the corresponding digital characters are
displayed. If the digital characters indicated in the table below are displayed, the key
or rotary knob is operating normally. The table indicating the correspondence
between the alphanumeric characters and digital characters are provided on page viii.
Key/Rotary Knob
Digital Characters
FUNC
FunC
GATE
GAtE
ARM
ArM
INH
inH
LOCAL
LoCAL
SHIFT
SHiFt
DATA
dAtA
TRIG
triG
CLOCK
CLoCK
PHASE
PHASE
>
riGHt
<
LEFt
MEAS
MEAS
SCALE
SCALE
Rotary knob to the right
rot r
Rotary knob to the left
rot L
Indicator test
You can test all the indicators including the 7-segment LED and the decimal point on
the display. However, the indicators for the RF input connector cannot be tested.
Turn the rotary knob and confirm that the lit position of the indicator moves
accordingly. If all the indicators except the RF input connector indicator light up in
order, the indicators are operating normally.
Meter test
You can test the analog meter through the range of motion of the needle. If the
needle moves from the zero position of the scale to beyond the maximum scale line
when performing the test in this section, it is operating normally.
Board test
You can test the CPU board and the measurement board. If [PASS] is displayed, the
board is operating normally. If a problem is detected, a hexadecimal value indicating
the problem can be displayed separately for the CPU board and measurement board.
Please quote this number when contacting your nearest YOKOGAWA dealer for
repairs.
9.4 Performing a Self-Test
