| 1. Scope of the coverage¡G |
| ¡@This specification is pertinent to the application
of metal glaze resistors (designated as RM). |
| 2 .Temperature range of the application¡G |
| ¡@-55¢J ¡ã +155¢J¡C |
| 3.Marking and illustration¡G |
| ¡@Two types of designation methods are available for
metal glaze resistors. One is black ink |
| ¡@alphanumeric marking and the other one is color code
marking. |
| ¡@alphanumeric marking ---->1/2W¡B1W¡B2W¡BS1W¡BS2W¡BS3W
(Fig.1) |
| ¡@color code marking ---------------->1/6W¡B S1/4W¡B1/4W¡BS1/2W
(Fig.2) |
| ¡@ |
| ¡@The color of flame proof resin coating is pinkish
red for the following types of resistors: (1/2W |
| ¡@¡B1W¡B2W ¡BS1W¡BS2W¡BS3W). Other type of resin and the
corresponding color is also listed: |
| ¡@Blue epoxy resin (1/6W¡B1/4W). |
| ¡@Pinkish red epoxy resin (S1/4W¡BS1/2W) |
 |
|
|
| ¡@Illustration of color codes¡G |
|
5%
Designation
|
1-st Band
(Sig. digit)
|
2-nd Band
(Sig. digit)
|
¡@
|
3-rd Band
(Multiplier)
|
4-th Band
(Tolerance)
|
|
|
1-st Band
(Sig. digit)
|
2-nd Band
(Sig. digit)
|
3-rd Band
(Sig. digit)
|
4-th Band
(Multiplier)
|
5-th Band
(Tolerance)
|
|
Black
|
0
|
0
|
0
|
1
|
.
|
|
Brown
|
1
|
1
|
1
|
10
|
¡Ó1%
|
|
Red
|
2
|
2
|
2
|
100
|
¡Ó2%
|
|
Orange
|
3
|
3
|
3
|
1000
|
.
|
|
Yellow
|
4
|
4
|
4
|
10000
|
.
|
|
Green
|
5
|
5
|
5
|
100000
|
¡Ó0.5%
|
|
Blue
|
6
|
6
|
6
|
1000000
|
¡Ó0.25%
|
|
Purple
|
7
|
7
|
7
|
10000000
|
¡Ó0.1%
|
|
Gray
|
8
|
8
|
8
|
.
|
¡Ó0.05%
|
|
White
|
9
|
9
|
9
|
.
|
.
|
|
Gold
|
.
|
.
|
.
|
0.1
|
¡Ó5%
|
|
Silver
|
.
|
.
|
.
|
0.01
|
¡Ó10%
|
|
| |
| 4.Illustration of color codes |
|
|
Resistance
Range
(£[)
|
Highest Working Voltage
(V)
|
 2
|
|
L
|
D£r
|
£d
|
d£r
|
|
1/6¡BS1/4
|
1K¡ã100M
|
500
|
3.3 ¡Ó0.3
|
1.8¡Ó0.2
|
28¡Ó2
|
0.45¡Ó0.05
|
|
1/4¡BS1/2
|
1K¡ã100M
|
1600
|
6¡Ó0.3
|
2.4¡Ó0.1
|
28¡Ó2
|
0.6¡Ó0.05
|
|
1/1¡BS1
|
1K¡ã100M
|
3500
|
9¡Ó0.5
|
3.3¡Ó0.5
|
30¡Ó3
|
0.6¡Ó0.05
|
|
1¡BS2
|
1K¡ã100M
|
3500
|
|
4.5¡Ó0.5
|
38¡Ó3
|
0.8¡Ó0.05
|
|
2¡BS3
|
1K¡ã100M
|
3500
|
|
5.5¡Ó0.5
|
38¡Ó3
|
0.8¡Ó0.05
|
|
| |
| 5.Coating |
¡@ |
| ¡@5.1 The maximum length of the lead wire covered by
the resin is 1mm |
| ¡@5.2 The maximum area of the end cap which is not
covered by the resin is half of the diameter of |
| ¡@5.2 the cap. |
| ¡@5.3 The status of coating condition described by
5.1 and 5.2 are acceptable. |
| ¡@ |
| 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 |
| ¡@1,000MW. |
| |
| ¡@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 following voltage from the tester to the resistor
for 1 min.. No flash-over, burning or |
| ¡@breakdown should be observed. |
|
W
|
1/6¡BS1/4
|
1/4¡B1/2¡B1¡B2¡BS1/2¡BS1¡BS2¡BS3
|
|
Dielectric strength
|
300V
|
700V
|
|
| |
| ¡@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-2, 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 acceptable change of the resistance
before and after the test is listed in Table-1. |
| |
|
W
|
1/6¡BS1/4
|
1/4¡B1/2¡B1¡B2¡BS1/2¡BS1¡BS2¡BS3
|
|
Acceptable change
|
¡Ó(1%+0.05£[)
|
¡Ó(0.5%+0.05£[)
|
|
| ¡@(Table-1) |
|
W
|
1/6¡BS1/4
|
1/4¡B1/2¡B1¡B2¡BS1/2¡BS1¡BS2¡BS3
|
|
Voltage
|
1000V
|
1500V
|
|
| ¡@(Table-2) |
| |
| ¡@6.6 Intermittent overload (Ref. JIS C5202 5.8) |
| ¡@Equipment: Intermittent tester |
| ¡@First put the resistor to the environment
chamber at 55¡Ó2¢J and relative humidity at 20% for 24
|
| ¡@hours. After that, take the resistor out
and stabilize it at room temperature for 30 min. Measure
the |
| ¡@resistance before the test. Put the resistor to a
horizontal position and a distance of 50mm from |
¡@each other. Apply 4 times of rated voltage
with a cycle of 1 sec. ON and 25 sec. OFF for
 |
| ¡@cycles. After that, take out the resistor
and let it rest at room temperature for 30 min. and
then |
| ¡@measure the resistance. The acceptable
% change of resistance is¡G¡Ó(1%+0.1£[)The voltage |
| ¡@applied should not exceed the value listed
in the following table. |
|
W
|
1/6¡BS1/4
|
1/4¡B1/2¡B1¡B2¡BS1/2¡BS1¡BS2¡BS3
|
|
Voltage
|
1000V
|
1500V
|
|
| |
| ¡@6.7 Pulse test |
| ¡@Equipment: Pulse tester |
| ¡@Arrange the sample (Rx) according to the
following diagram. Apply DC:10KV, 0.001£gF capacitor.
|
| ¡@One charge-discharge cycle is 5 sec. Continue
50 cycles. After the test, take the sample out and |
| ¡@stabilize at room temperature for 30 min..
Measure the resistance before and after the test. The
|
| ¡@acceptable change is¡Ó20%. the appearance
should show no remarkable abnormality and |
| ¡@legibility of marking. During the test,
no arcing should be observed.¡@ |
¡@ -
|
| |
| 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(1.5%+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 hour 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: |
| ¡@< 100K¡Ó300 PPM/¢J or ¡Ù100K¡Ó200 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. |
| |
| ¡@ 7.6 Low temperature storage (Ref. JIS C5202 7.1) |
| ¡@Equipment: Low temperature chamber |
| ¡@Stabilize the resistor at room temperature for 30
min. then measure the resistance. Put the |
| ¡@resistors into the chamber and gradually lower the
temperature to -55¡Ó3¢J and maintain at that |
¡@temperature for
hours. Gradually raise the temperature of the chamber
to room temperature |
| ¡@and then take resistors out and stabilize at room
temperature for 1 to 2 hours. Measure the |
| ¡@resistance value. The change of the resistance before
and after the test should be less than |
| ¡@¡Ó(1%+0.05£[). The appearance should show no remarkable
abnormality and legibility of marking. |
| ¡@(Remove any water condensation on the resistor body
during the test) |
| ¡@ |
| 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) |
| ¡@8.3.1 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), 1.0Kg (0.6£p
lead |
| ¡@wire) or 0.5Kg (0.45£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£[). |
| |
| ¡@8.3.2 Torsional strength |
| ¡@Equipment: Torsion tester |
| ¡@Bend the terminal 6.4mm away from the body according
to Fig-a to 90 degree with a curvature of |
| ¡@0.75mm¡ã0.80mm. The lead wire should be clamped at
a point of 1.2mm away from the bending |
| ¡@point by a fixture which can rotate 360 degree according
to Fig-b. Rotate the resistor 360 degree |
| ¡@clockwise and counter clockwise for 1 cycle. The
rotation speed is 360 degree per 5 sec.. Perform |
| ¡@3 cycles for the lead wire diameter of 0.8£p, 1.5
cycles for that of 0.6£p and 1 cycle for that of 0.45£p.
|
| ¡@The terminal should not break down or
detached from the body. The acceptable change of |
| ¡@resistance is ¡Ó(0.5%+0.05£[). |
¡@ ¡@¡@¡@ |
| |
