Minebea DSA-631, Instruction Manual

Page: 15 / 64

5
No. Name Function
④
Bridge check / Cable length
compensation / Auto-balance knob
(BAL)
* See pages 16 to 18 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
paragraph 9 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 paragraph 15 to 16.
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) illuminating), 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.)
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) illuminates. 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 comes 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.
⑧
Measuring range selection knob
(RANGE) This knob is used to select the measuring range.
Turning this knob clockwise narrows the measuring
range (i.e. increasing the sensitivity). See page 14 for
measuring range. In this case, fine tuning is not
made. [Fine tuning LED (10) comes off.]
Table 2-1. Front panel : Names and Functions (2)