5.0: Setting up the Transducer and LDX-4 m(continued)
5.2: Basic Procedure
To set-up the LDX-4, some basic steps should be followed.
The following steps describe a typical setting procedure and applies to most ap-
plications. Other procedures may be used as appropriate.
Step 1 Step 2
Step 3
Step 4
Step 5
Set-up Align LDX-4 Set LDX-4
Add Offset
Final
LDX- 4 and
and
if Required
Checks
links
Transducer Null Transducer Range
V/V
±V
Hz
K
W
Zero
-5V
+5V
Null
electronics
transducer
Null
Zero
transducer
electronics
Null
+5V
0V
+10V
electronics
transducer
Shift
zero
✓
For a bi-polar output i.e. ±10 VDC or ±20 mA, follow steps 1 to 3.
For a uni-polar output i.e. 0-10 V, 0-20 mA or 4-20 mA, follow steps 1 to 4.
In either case, step 5 (final checks) should be followed on the completion of the
set-up.
5.2: Basic Procedure
STEP 1 - Set-up LDX-4 Links
If the transducer characteristics are known, set the frequency and input resis-
tance links as required. If the transducer characteristics are not known, the
standard link settings should be used.
If your transducer is known to be outside of the standard sensitivity range, the X2
or DIV2 links will have to be used. See section 5.3.
STEP 2 - Align LDX-4 Null and Transducer Null
Any electrical offset in the LDX-4 is removed. The transducer position is adjusted
so that transducer and LDX-4 nulls are aligned.
Null the LDX-4
1. Put the Gain link on position (7) as
shown. This allows any electronics offset
in the output stage to be removed.
2.
Adjust the Fine Offset control to give as
near to zero output as practical.
Null the transducer.
1. Replace the Gain link to the original posi-
tion.
2. Adjust the position of the transducer to
give as near to zero output as practi-
cal. This is the centre of the mechanical
range.
If the transducer cannot be centered for practical reasons an offset will remain
within the system. There may be noticeable interaction between Gain and Offset
adjustment. This does not prevent the LDX-4 being set-up, however several itera-
tions may be required when adjusting Gain and Offset. Please contact your supplier
if guidance is required.
1 2 3 4 5 6 (7)
FREQ
LO
(O N)
HI
(O FF)
N
U
LL
