Texmate, Inc. Tel. (760) 598-9899 • www.texmate.com
DL-40JANUS-DCA/DCV manual (d0114)
Page 13
Input Module Component Glossary
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
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
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 adjust-
ment range of the SPAN pot into five equal 20% steps,
across 100% of the input Signal Span. Any input Signal
Span can then be precisely 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
15 Turn Potentiometer
≈
+
100 Counts
≈
–
100 Counts
–
0
+
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).
ZERO ADJUST Header
When this header is provided, it works in conjunc-
tion 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, positive offset, or no offset (ZERO
pot disabled for two step non-interactive span and
offset calibration).
Offset
0
–
+
0
–
+
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
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
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
