SMD Sealed Type (PVG3/M4A_D01/G5)/Lead Sealed Type (PV32/12/37/36) Specifications and Test Methods

Continued on the following page.

5

Voltage Setting

Stability

The wiper should be set at approximately 40% of the actual effective-electrical rotational angle (number of turns). An

adequate DC test potential should be applied between terminal #1 and terminal #3. The voltage between terminal #1

and terminal #3, and the voltage between terminal #1 and terminal #2, should be measured and applied to the

following formula.

Voltage setting stability=

E

e'

–—

E

e : Before test

(The voltage between terminal #1 and terminal #2)

e' : After test

(The voltage between terminal #1 and terminal #2)

Figure 2

4

Temperature Coefficient of

Resistance

The trimmer potentiometer should be subjected to each of the following temperatures (see Table 3) for 30-45

minutes. Temperature coefficient of resistance should be applied to the following formula.

Note*: Reference temperature

Table 3: Test temperatures

3

Contact Resistance

Variation

Contact resistance variation should be measured with the measuring circuit shown in Figure 1, or its equivalent. The

adjustment rotor (screw) should be rotated in both directions through 90% of the actual effective-electrical rotational

angle (number of turns) for a total of 6 cycles. Only the last 3 cycles should count in determining whether or not a

contact resistance variation is observed at least twice in the same location, exclusive of the roll-on or roll-off points

where the contact arm moves from the termination, on or off, the resistance element. The rate of rotation of the

adjustment rotor (screw) should be such that the adjustment rotor (screw) completes 1 cycle for 5 seconds minimum

to 2 minutes maximum. The test current used should follow the value given in Table 2 unless otherwise limited by

power rating.

Table 2: Test current for CRV

Figure 1: CRV measuring circuit

2

Residual Resistance

Position the contact arm at the extreme counterclockwise limit of mechanical travel and measure the resistance

between the contact arm and the corresponding end terminal. Then, position the contact arm at the extreme

clockwise limit of mechanical travel and measure the resistance between the contact arm and the corresponding end

terminal. During this test, take suitable precautions to ensure that the rated current of the resistance element is not

exceeded.

1

Total Resistance

Measure total resistance between the resistance element and terminals (#1 and #3) with the contact arm positioned

against a stop. The positioning of the contact arm and terminal should be the same for subsequent total resistance

measurements on the same device. Use the test voltage specified in Table 1 for total resistance measurements.

This voltage should be used for all subsequent total resistance measurements.

Table 1: Total resistance test voltage

Total Resistance,

Nominal (ohm)

Maximum Test

Voltage (V)

1.0

3.0

10.0

30.0

100.0

V100

V1k

V10k

V100k

10

VR

100

FR

1k

FR

10k

FR

100k

FR

Standard Total Resistance

R (ohm)

Test Current

20mA

10mA

4mA

2mA

1mA

200μA

100μA

50μA

30μA

R

100

FR

500

VR

1k

VR

2k

VR

50k

VR

200k

VR

1M

VR

2M

VR

V100

F500

F1k

F2k

F50k

F200k

F1M

F2M

Sequence

1*

+25

2

-15

3

Min. operating

Temperature

4*

+25

5

+65

6

Max. operating

Temperature

Temperature (°C)

The following describes trimmer potentiometer testing conducted by Murata Manufacturing Co., Ltd. in accordance with MIL-R-22097 (military specification

for variable resistors, non-wirewound) and MIL-STD-202 (test methods for electronic and electrical component parts).

No.

Test Methods

Item

Rx

#1

#2

#3

Constant Current Source

(Test current shown in Table 2)

Calibration

resistance

AC

Amplifier

Oscilloscope

Oscilloscope bandwidth :100Hz to 50kHz

Rx : Trimmer Potentiometer

e

#2

#1

#3

E

TCR=

vertical

entry

R50E.pdf

Jul.23,2012

46

• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.