Showa 5683, Operation Manual

Page: 15 / 68

２−２
Number Name Function
Bridge check
/Cable length compensation
/Auto-balance knob (BAL)
z See pages 3-5 to 3-7 for bridge
check and cable length
compensation
Pressing the knob performs bridge check and cable length
compensation, enabling automatic balancing of resistors
and capacitance. For details, see page 2-6 Indication upon
Balancing.
The result of bridge check is indicated on digital monitor
(3). If there is neither disconnection nor short, the indication
of Good is made, thereby making cable length
compensation (dropout rate indication) and
auto-balancing. If there is a disconnection or short, the
problematic location is repeatedly indicated. After
confirming the location, make repair. For more information
on bridge check function, see pages 3-5 and 3-6.
The capacitance balance is always offset. Whenever this
button is pressed, the resistance balance is automatically
kept accordingly.
Note: When the high-pass filter is used (High-pass filter
LED (15)lightning), even balancing is not performed,
indication of good balance (
０ V) is made. Therefore, do not
forget to perform balancing. When the high-pass filter is
turned on, a frequency element of 0.5 Hz or lower
including DC is deleted, which is the state of the offset
voltage cancellation.
(4)
Resistance balance fine tuning
(R-FINE) Turning this knob clockwise moves the output to the
positive side, while turning it counter-clockwise moves the
output to the negative side.
(5)
Keylock switch
(KEY LOCK
）
On/Off switching for keylock can be made by pressing this
knob for one second or longer. While in the lock state,
keylock LED (6) turns on. In this state, BAL (4), measuring
range selection (8), measuring range fine tuning (9),
calibration value setting (12) and filter setting (16) cannot
be used. Pressing this knob for one second or longer
cancels the lock; keylock LED (6) also turns off.
(6)
Keylock
ＬＥＤ
This LED indicates whether keylock is effective or not, in
that light-up for lock and light-out for unlock..
(7) Bridge power voltage LED
(BV (V)) This LED indicates the bridge power voltage (0.5 V or 2 V).
To select, use bridge power voltage selection switch 3
on the rear panel.
Table 2-1 Front Panel: Names and Functions (2)