Exciting Frequency - Toshiba LF620F Instruction Manual

8.2.4 Exciting Frequency

You can select an exciting frequency of 6Hz, 12Hz or 24Hz.
Since each exciting frequency value has its own characteristics, you should select an appropriate exciting
frequency (24Hz is set at shipment. Depending on the characteristics of the detector, a large frequency
may result in excitation failure. When a large frequency value is set and it changes the indicator value,
decrease the frequency to a value that will not change the indicator value.)
Exciting frequency
Zero-point stability
Response
Withstand fluid noise
However, the range of usable exciting frequency depending on the detector to be combined is shown
below.
Detector
combined
LF414,LF434,LF65
4
GF630,GF632
LF434,LF654
LF494
GF630, GF632
GF630, GF632
LF664
◎Factory setting
Shown below is an example of changing the exciting frequency from 24Hz to 12Hz.
Switch operation
STEP1
STEP2
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6Hz
Meter size
0.6'' to 8''
10'' to 18''
1'' to 4''
10'' to 18''
20'' to 36'
20'' to 80'
○Combination allowed
Display example
A:DETECTOR
Select "EXC FREQ" from the setting item
1 EXC CUR
selection menu.
2 SIZE
3 EXC FREQ
4 FLOW DIR
5 EXIT
ESC
EXC FREQ
The currently set excitation frequency
(24Hz in this example) appears.
24
Then push
Hz
* Pushing
ESC
EXC FREQ
The switches at the bottom change.
(
24
At the same time, the cursor appears.
(The item indicated by the cursor is
Hz
highlighted.)
Then push
－ 59 －
12Hz 24Hz
Corresponding exciting frequency
6Hz 12Hz
○ ○
○ ◎
○ ○
○ ◎
−
◎
−
◎
− Combination not allowed
Description
.
ESC
returns you to the setting
menu.
are shown)
.
6 F 8 A 0 9 2 8
Good
Good
Good
24Hz
◎
−
◎
−
−
−