| 1. Scope of the coverage¡G |
| ¡@This specification is pertinent to the application
of metal plate resistors ( designated as MPC )¡C |
| 2 .Temperature range of the application¡G |
| ¡@-55¢J ¡ã +155¢J¡C |
| 3. Type¡G |
| ¡@ One type, normal size, of metal plate
resistors is offered in this specification (ref. To
Table-1) |
| 4.Marking and illustration¡G |
| ¡@The designation method for MPC is by the alpheumeric
marking of black ink(Fig.1) |
 |
| ¡@ |
| 5.Dimension, voltage, resistance range: listed
in the following table¡@Unit: mm |
|
|
|
Type
|
Rated Power
(W)
|
Resistance Range £[
|
Highest working
(V)
|
Highest Overload (V)
|
Dimension (unit : mm )
|
|
A
|
B
|
C
|
d
|
|
MPC 70
|
2
|
0.1¡ã1.0
|
|
|
8¡Ó1.0
|
13¡Ó1.0
|
4¡Ó0.5
|
0.6¡Ó0.1
|
|
MPC 76
|
0.01¡ã0.05
|
|
|
8¡Ó1.0
|
13¡Ó1.0
|
4¡Ó0.5
|
0.6¡Ó0.1
|
|
MPC 78
|
0.1¡ã1.0
|
|
|
8¡Ó1.0
|
13¡Ó1.0
|
4¡Ó0.5
|
0.6¡Ó0.1
|
|
MPC 71
|
5
|
0.1¡ã1.0
|
|
|
18¡Ó1.0
|
14¡Ó1.0
|
5¡Ó0.5
|
0.6¡Ó0.1
|
|
MPC 74
|
0.1¡ã0.1.0
|
|
|
18¡Ó1.0
|
14¡Ó1.0
|
5¡Ó0.5
|
0.8¡Ó0.1
|
|
MPC 75
|
0.01¡ã0.08
|
|
|
18¡Ó1.0
|
14¡Ó1.0
|
5¡Ó0.5
|
0.8¡Ó0.1
|
|
MPC 75
|
1.5¡ã2.2
|
|
|
18¡Ó1.0
|
14¡Ó1.0
|
5¡Ó0.5
|
0.6¡Ó0.1
|
|
| ¡@ |
| 6.Characteristics of electrical performance |
| ¡@6.1 Rated power |
| ¡@The rated power indicates the maximum power the resistor
can endure continuously when the |
| ¡@ambient temperature is equal to or lower than 70¢J.
When the ambient temperature is higher than |
| ¡@70¢J, the rated power of the resistor is determined
by the derating curve described in the following |
| ¡@figure. |
¡@ |
| ¡@ |
| ¡@6.2 Rated voltage |
| ¡@The rated voltage of a resistor is either a continuous
DC voltage or an AC rms voltage which can be |
| ¡@calculated by the following formula. If the calculated
rated voltage is higher than the highest |
| ¡@working voltage then the highest working voltage
should be used as the rated voltage. |
¡@ ¡@P:
Rated power(W)¡@R: Nominal resistance(£[)¡@E: Rated voltage(V) |
| ¡@ |
| ¡@6.3 Insulation resistance (Ref. JIS C5202 5.6) |
| ¡@Equipment: Insulation resistance tester |
| ¡@The body of the resistor is wrapped around by the
aluminum foil without extending beyond the |
| ¡@resistor body. Clap one electrode on the aluminum
foil and the other electrode on the lead wire. |
| ¡@Apply 500V from the tester for 1 min. and the measured
resistance value should be larger than |
| ¡@¡Ù 10M£[. |
| ¡@ |
| ¡@6.4 Dielectric strength (Ref. JIS C5202
5.7) |
| ¡@Equipment: Dielectric strength tester |
| ¡@The body of the resistor is wrapped around by the
aluminum foil without extending beyond the |
| ¡@resistor body. Clap one electrode on the aluminum
foil and the other electrode on the lead wire. |
| ¡@Apply 500V from to the electrodes for 1 min. No flash-over,
burning or breakdown should be |
| ¡@observed. |
| ¡@ |
| ¡@6.5 Short time overload (SOL) (Ref. JIS C5202 5.5) |
| ¡@Equipment: S.O.L. tester. |
| ¡@Apply 2.5 times of rated voltage to the resistors
for 5 seconds. If the applied voltage is larger than
|
| ¡@the voltage listed in the following table, then the
voltage in the table should be used instead. After |
| ¡@ the test, the sample should be stabilized at room
temperature for 30 min. before the resistance is |
| ¡@measured. The change of the resistance before and
after the test should be: ¡Ó(2%+0.1£[). |
| ¡@ |
| 7.Environmental tests |
| ¡@7.1 Load life test (Endurance with rated load) (Ref.
JIS C5202 7.10) |
| ¡@Equipment: High temperature chamber and DC power
supply |
| ¡@The resistors are put in a fixture where no interference
will be allowed. Put the fixture in a 70¡Ó3¢J |
¡@chamber and apply rated voltage with a cycle of 90
min. ON and 30 min. OFF for
hours. |
| ¡@ After 240, 480, 720 and 1,000 hours,
the resistors are taken out and stabilize at room temperature
|
| ¡@for 30 min. and then the resistance is measured.
Upon each step of resistance measurement, the |
| ¡@change of the resistance should not exceed ¡Ó(5%+0.1£[)
and the appearance should show no |
| ¡@remarkable abnormality and legibility of marking. |
| ¡@ |
| ¡@7.2 Resistance to damp heat (Ref. To JIS C5202 7.2) |
| ¡@Equipment: Constant temperature and humidity chamber |
| ¡@The resistors are put in a 40¡Ó2¢J chamber with RH=90¡ã95%
for 240¡Ó4 hours. After the test, take |
| ¡@the resistors out and stabilize in room temperature
for 1 - 4 hour. Measure the resistance. The |
| ¡@acceptable change of resistance should not exceed
¡Ó(2%+0.1£[) and the appearance should show |
| ¡@no remarkable abnormality and legibility of marking. |
| ¡@ |
| ¡@7.3 Endurance under damp heat and load (Ref. JIS
C5202 7.9) |
| ¡@Equipment: Constant temperature and humidity chamber,
DC power supply |
| ¡@The resistors are put in a fixture where
no interference will be allowed. Put the fixture in
a 40¡Ó2¢J |
| ¡@chamber with RH=90¡ã95% and apply rated voltage with
a cycle of 90 min. ON and 30 min. OFF for |
| ¡@
hours. Water drops should avoid dripping on the resistors.
After 240 and 1,000 hours, the |
| ¡@resistors are taken out and stabilize
at room temperature for 1 hou-r and then the resistance
is |
| ¡@measured. Upon each step of measurement,
the change of the resistance should not exceed |
| ¡@¡Ó(5%+0.1£[) and the appearance should
show no remarkable abnormality and legibility of marking. |
| |
| ¡@7.4 Temperature coefficient (TCR) (Ref. JIS C5202
5.2) |
| ¡@Equipment: High temperature chamber |
| ¡@Measure the resistance at room temperature.
Put the resistor in a chamber with the temperature |
| ¡@ of RT+100¢J for 30 - 45 min. to stabilize.
Measure the resistance again. Compare the resistance
|
| ¡@at these two temperatures with the following
equation and the acceptable value is ¡Ó350 PPM/¢J. |
¡@ |
| ¡@R = Resistance at T ¡@T = RT + 100¢J¡@Ro
= Resistance at To¡@To =room temperature |
| |
| ¡@7.5 Temperature cycling (Ref. JIS C5202 7.4) |
| ¡@Equipment: High temperature chamber, low temperature
chamber |
| ¡@Measure the resistance before the test. Put the resistor
to -55¢J chamber for 30 min. then take it |
| ¡@ out at room temperature for 2 to 3 min.. Put the
resistor to +155 ¢Jchamber for 30 min. then take it |
| ¡@out at room temperature for 2 to 3 min. This completes
a cycle. Repeat the cycle 5 times. Put |
| ¡@resistors at room temperature for 90 min. and then
measure the resistance. Compare the |
| ¡@resistance before and after test. The acceptable
change of resistance is ¡Ó(1%+0.05£[). The |
| ¡@appearance should show no remarkable abnormality
and legibility of marking. |
| |
| 8. Mechanical performance |
| ¡@8.1 Resistance to soldering heat (Ref. JIS C5202
6.4) |
| ¡@Equipment: Solder bath |
| ¡@Measure the resistance before the test. Immerse part
of the lead wire which is 4¡Ó0.8mm away from |
| ¡@the body to the flux for 5 - 10 sec. Take the resistor
out and immerse resistors in the solder bath of |
| ¡@350¡Ó10¢J for 3.5¡Ó0.5 sec.. Stabilize at room temperature
for 1 hour and then measure the |
| ¡@resistance value. Compare the resistance values before
and after the test, The acceptable change |
| ¡@is ¡Ó(1%+0.05£[). |
| ¡@ |
| ¡@8.2 Solderability (Ref. JIS C5202 6.5) |
| ¡@Equipment: Solder bath |
| ¡@Immerse part of the lead wire which is 4¡Ó0.8mm away
from the body to the flux for 5 - 10 sec. Take |
| ¡@the resistor out and immerse resistors in the solder
bath of 245¡Ó5¢J for 3.5¡Ó0.5 sec.. Take the |
| ¡@resistor out and inspect the lead wire visually.
The acceptable level is the coverage of the new |
| ¡@solder to be 95%. The composition of the solder bath
is 99.7% tin and 0.3% Cu. |
| ¡@ |
| ¡@8.3 Robustness of terminals (Ref. JIS C5202 6.1) |
| ¡@Tensile strength of termination |
| ¡@Equipment: Weight gauge |
| ¡@Fixed the resistor and apply axially along the lead
wire of 2.5Kg (0.8£p lead wire) or 1.0Kg (0.6£p lead |
| ¡@wire) for 30 sec.. The lead wire should not break
or detached from the resistor and the change of |
| ¡@the resistance should be less than ¡Ó(0.5%+0.05£[). |
|
¡@
