15 Turn Potentiometer
≈
+
100 Counts
≈
–
100 Counts
–
0
+
Page 16
CL-B101D40PS Manual (d0096)
ZERO ADJUST Header
When this header is provided, it works in con-
junction with the ZERO OFFSET RANGE Header,
and expands the ZERO pot’s offset capability into
five equal negative steps or five equal positive
steps. This enables virtually any degree of input
signal offset required to display any desired engi-
neering unit of measure.
ZERO OFFSET RANGE Header
When provided, this three position header increases
the ZERO pot’s capability to offset the input signal,
to ±25% of the digital display span. For example a
Negative offset enables a 1 to 5V input to display 0
to full scale. The user can select negative offset, pos-
itive offset, or no offset (ZERO pot disabled for two
step non-interactive span and offset calibration).
LO RANGE
HI RANGE
10%
SPAN Pot %
10%
10%
10%
10%
10%
Signal Span %
20%
30%
40%
50%
1
SPAN Adjust
Header position
Span Adjust Header
Span Adjust Header
Span Range Header
2
3
4
5
10%
10%
10% 10%
10%
60%
70%
80% 90%
100%
1
2
3
4
5
< Decrease Span Increase >
1 2
3
4 5
< Decrease Span Increase >
1 2
3
4 5
Equivalent
Circuit
Acts like a
150 Turn
Potentiometer
Low Range
High Range
Input LO
Input HI
HI
LO
< Increase Zero Decrease >
5 4
3
2 1
< I
ncre
ase
Zer
o D
ecre
ase
>
5
4
3
2
1
Input and Output Pins
On most modules Pin 1 is the Signal High input
and Pin 3 is the Signal Low input. Typically Pin 2
is used for Excitation Voltage output.
HI
LO
24V
Exc
Offset
0
–
+
0
–
+
INPUT RANGE Header
Range values are marked on the PCB. Typically
two to four positions are provided, which are
selected with either a single or multiple jumper
clip. When provided, a custom range position is
only functional when the option has been factory
installed.
Custom
200V
20V
2V
24V DC Output Header
On some modules this header enables a 24V
DC 25mA (max) Excitation/Auxiliary output to be
connected to Pin 2.
ON
OF
F
OFF
ON
24V EXC
< Increase Span Decrease >
5 4
3
2 1
< I
ncre
ase
Spa
n D
ecre
ase
>
5 4
3
2 1
SPAN RANGE Header
When this header is provided it works in conjunc-
tion with the SPAN ADJUST Header by splitting
its adjustment range into a Hi and a Lo range.
This has the effect of dividing the adjustment
range of the SPAN pot into ten equal 10% steps
across 100% of the input Signal Span.
Range
HI
LO
HI
LO
Zero Offset Range Header
0 +
–
–20%
ZERO Pot %
–20% –20% –20% –20%
No
Offset
NEGATIVE OFFSET
POSITIVE OFFSET
–1200 or more counts
Offset Range
+20% +20% +20% +20% +20%
+1200 or more counts
5
ZERO Adjust
Header position
4
3
2
1
1
2
3
4
5
75 Turn Potentiometer
–
0
Equivalent
Circuit
< Increase Zero Decrease >
5 4
3
2 1
< Decrease Zero Increase >
1 2
3
4 5
75 Turn Potentiometer
+
0
Zero Pot
Disabled
SPAN
Turn Clockwise to
Increase Reading
To the
Right Rear
SPAN Potentiometer (Pot)
If provided, the 15 turn SPAN pot is always on
the right side (as viewed from the rear of the
meter). Typical adjustment is 20% of the input
signal range.
20%
SPAN Pot %
20%
20%
20%
20%
20%
Signal Span %
40%
60%
80%
100%
1
SPAN Adjust
Header position
2
3
4
5
< Decrease Span Increase >
1 2
3
4 5
Acts like 75 Turn 1 Mega ohm Potentiometer
Input LO
Input
HI
Equivalent
Circuit
SPAN ADJUST Header
This unique five-position header expands the
adjustment range of the SPAN pot into five equal
20% steps, across 100% of the input Signal
Span. Any input Signal Span can then be pre-
cisely scaled down to provide any required Digital
Display span from 1999 counts to 001 (one count).
ZERO
Turn Clockwise to
Increase Reading
To the
Left Rear
ZERO Potentiometer (Pot)
If provided, the ZERO pot is always to the left
of the SPAN pot (as viewed from the rear of the
meter). Typically it enables the input signal to be
offset ±5% of full scale (-100 to +100 counts).
Input Module Component Glossary
Zero Offset Range Header
0 +
–
No
Offset
NEGATIVE OFFSET
Decreases Digital Reading
POSITIVE OFFSET
Increases Digital Reading
15 Turn Potentiometer
–
0
Equivalent
Circuit
15 Turn Potentiometer
+
0
Zero Pot
Disabled
≈
–
500 Counts
Offset Range
– 100% of Offset
ZERO Pot%
≈
+
500 Counts
+ 100% of Offset
