SPECIFICATION No. JVR03Z-7148B

4/12

UNCONTROLLED

COPY

REFERENCE ONLY

AC

Amplifier

Oscilloscope

Proofread

Resistance

Constant Current Source

(Test current shown in below)

Rx

#1

#2

#3

RX:Trimmer Potentiometer

5. Test Method

5.1 Contact resistance variation (CRV)

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

The operating wiper should 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 should be such that the wiper completes

1 count in determining whether or not a contact resistance variation is observed at least twice in the same

location.

[Measurement circuit]

[Measurement wave]

[Test current for CRV]

IS : Test current for CRV

RX: Nominal total resistance of trimmer potentiometer

VN: Noise voltage (peak to peak)

5.2 Temperature coefficient of resistance

The trimmer potentiometer should be subjected to

each of the following temperatures (see Table 1)

for 30 to 45 minutes. The resistance value

should be measured in the chamber.

TC =

X 10

5.3 Permitted force of Driver plate

second. The load should be applied on driver plate uniformly by the 3mm-size plate of push-pull gage.

5.4 Soldering strength

The trimmer potentiometer should be soldered under the soldering condition described in paragraph 7.2(1) on

from rear side through the hole opened in the center of PCB by the 1.0±0.1mm dia. stick for 5 second.

variable portion

Nominal total resistance

Test current

220 ohm<=R< 10k ohm

10k ohm<=R<100k ohm

100k ohm<=R

10mA max.

1mA max.

100

µA max.

Table 1

Sequence

*1

2

*3

4

Temp. (°C) +25±2

-25±3

+25±2

+85±3

Note)*: Norm Temp.

VN

CRV =

100(%)

IS • RX

The tests and measurements should 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.

If questionable results occur that have been measured in accordance with the above mentioned

conditions, the tests and measurements should 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.

When the trimmer potentiometer is tested after soldering on PCB, it should be tested after being kept

in a room (15 to 35°C, 25 to 75%RH) over 24 hours except ” 5.12 Resistance to soldering heat“.