No.

Item

Test Methods

Total Resistance

1

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

positioned against a stop. The positioning of the contact arm and terminal shall 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 shall be used whenever a

subsequent total resistance measurement is made.

Specifications and Test Methods

Residual Resistanc

2

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 clock-

wise limit of mechanical travel and measure the resistance between the contact arm and the corresponding end ter-

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

exceeded.

Contact Resistance

3

4

1

Total resistance,

Nominal (ohm)

10

VRV100

100

FRV1k

1k

FRV10k

10k

FRV100k

100k

FR

1.0

Maximum Test

Voltage (V)

Rx

1

2

3

Proofreaded

Resistence

AC

Amplifier

Oscilloscope

Rx : Trimmer Potentiometer

Oscilloscope bandwidth :100Hz to 50kHz

Constant Current

Source not to

Exceed Rating of

Unit Being Tested

Figure-1 CRV measuring circuit

Table-1 Total resistance test voltage

3.0

10.0

30.0

100.0

Contact resistance variation shall be measured with the measuring circuit shown in below, or its equivalent. The

operating wiper shall be rotated in both directions through 90% of the actual effective-electrical travel for a total of 6

cycles.

The rate of rotation of the operating wiper shall be such that the wiper completes 1 countin determining whether or

not a contact resistance variation is observed at least twice in the same location. The test current shall follow the

value given in Table-2 unless otherwise limited by the power rating.

Standard total

resistance R (ohm)

100

VRF10k

10k

VRF100k

100

VR

10mA Max.

Test Current

Table-2 Test current for CRV

1mA Max.

100µA Max.

Humidity Exposure

The wiper contact point shall be pre-setted at about 50% position of effective rotational angle. After that, the poten-

tiometer shall be placed in a chamber at 40±2°C and 90 - 95% without loading for 500±12 hours.

The resistance value shall be measured after keeping the potentiometer in a room for 5±1/6 hours.

5

High Temperature

Exposure

The wiper contact point shall be pre-setted at about 50% position of effective rotational angle. After that, the poten-

tiometer shall be placed in a chamber at 70±2°C without loading for 500±12 hours. The resistance value shall be

measured after keeping the potentiometer in a room for 1.5±1/6 hours.

6

Humidity Load Life

The wiper contact point shall be pre-setted at about 50% position of effective rotational angle. After that, the poten-

tiometer shall be placed in a chamber at 40±2°C and 90 - 95% with loading the 1/2 rated voltage between #1 and #2

terminals, intermittently 1.5 hours ON and 0.5 hours OFF for 1000±12hours.

The resistance value shall be measured after keeping the potentiometer in a room for 5±1/6 hours.

7

Load Life

The wiper contact point shall be pre-setted at about 50% position of effective rotational angle. After that, the poten-

tiometer shall be placed in a chamber at 70±2°C (50±2°C for PVZ) with loading the 1/2 rated voltage between #1

and #2 terminals, intermittently 1.5 hours ON and 0.5 hours OFF for 1000±12 hours. The resistance value shall be

measured after keeping the potentiometer in a room for 1.5±1/6 hours.

The tests and measurements shall be conducted under the condition of 15 to 35°C of temperature, 25 to 75% of relative humidity and 86 to 106 kpa of

atmospheric pressure unless otherwise specified. In case when entertained a doubt in judgment obtained from results measured in accordance with the

above mentioned conditions, the tests and measurements shall be conducted under the condition of 25±2°C of temperature and, 45 to 55% of relative

humidity and 86 to 106 kpa of atmospheric pressure.

8

Temperature Cycle

The wiper contact point shall be pre-setted at about 50% position of effective rotational angle. After that, the poten-

tiometer shall be subjected to Table-3,Table-4 temperature for 5 cycles. The resistance value shall be measured

after keeping the potentiometer in a room for 1.5±10 minutes.

Sequence

Temp. (°C)

-25±3

1

Table-3 PVZ

Time (min.)

+25±2

2

3

+85±3

+25±2

4

30±3

10Max.

Sequence

Temp. (°C)

-55±3

1

Table-4 PVA3/PVS3/PVM4A

---A01

Time (min.)

30±3

+25±2

2

10Max.

3

+125±3 +25±2

4

30±3

10Max.

Continued on the following page.

10Max.

30±3

SMD Open Type and PVM4A_A01 Series Specifications and Test Methods

70

9

• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specification or transact the approval sheet for product specification before ordering.

Please read rating and !CAUTION (for storage and operating, rating, soldering and mounting, handling) in this PDF catalog to prevent smoking and/or burning, etc.

This catalog has only typical specifications. Therefore, you are requested to approve our product specification or to transact the approval sheet for product specificaion before ordering.

!Note

R50E12.pdf 02.9.5