Data Sheet

www.acptechnologies.com Specifications on this catalog are for reference only, as they are subject to change without notice.
GENERAL CONCEPTS
Potentiometer
configuration
The pin that corresponds to the reading of the wiper is pin B.
A and C are connected to the ends of the resistor, being pin A the initial position and C the final position.
C
Clockwise shaft rotation
A
B
WIPER
CCW
CW
S-B
A-A
E-C
A-A
E-C
S-B
S-B
A-A
E-C
A-A
S-B
E-C
When pins A and B or C and B are connected, the current goes
through the wiper (blue line).
Depending on where in the resistor the wiper is placed, it indicates
a lower resistive value than the whole resistor would (we say it is
used as variable resistor or rheostat).
The output is measured in ohms.
Voltage Divider
A-A
C-E
B-S
VT
Vo
C-E
Rheostat
A-A
B-S
Variable resistor Voltage divider
When a voltage is applied between the ends of the resistor (A and C),
the current goes through the resistor, not the wiper.
The wiper sees a proportional share of the voltage applied between
the ends (we say this is a Voltage Divider).
The output is a voltage, measured in V.
Electric use
Total resistance (R
T
):
It is the resistance found between the input terminal and the wiper when the latter is positioned to give the maximum value.
Electric noise or contact resistance (R
C
):
Noise is any variation in the output signal that does not correspond to a similar variation in the input signal. It appears in the contact point
between the resistive element and the wiper. It is measured in Ohms.
This noise can also be measured as “contact resistance variation” (CRV), which is expressed in the percentage of change between the
initial resistance and the value of the resistance after a test. It is measured statically and dynamically. ACP’s potentiometers have less than
5% CRV.
Resistance
100Ω
100
200Ω
200
220Ω
220
250Ω
250
470Ω
470
500Ω
500
1KΩ
1K
2KΩ
2K
2.2KΩ
2K2
2.5KΩ
2K5
4.7KΩ
4K7
5KΩ
5K
10KΩ
10K
20KΩ
20K
22KΩ
22K
25KΩ
25K
47KΩ
47K
50KΩ
50K
100KΩ
100K
200KΩ
200K
220KΩ
220K
250KΩ
250K
470KΩ
470K
500KΩ
500K
1MΩ
1M
2MΩ
2M
2.5MΩ
2M5
4.7MΩ
4M7
5MΩ
5M
ACP’s standard
resistive values
The standard values are as follows, although values out of range can also be studied.
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