參數(shù)資料
型號(hào)： 3224W-1-102E
英文描述： TRIMMER SMD CERMET MEHR 1K 300V 0.25W
中文描述： 修邊機(jī)表面貼裝金屬陶瓷伊朗Mehr一千300V 0.25W
文件頁(yè)數(shù)： 85/86頁(yè)
文件大?。?/td> 3230K
代理商： 3224W-1-102E
Specifications are subject to change without notice.
89
SINGLE-TURN SETTABILITY (3386)
MULTITURN SETTABILITY (3299)
400
300
200
MV.
500
400
MV.
0
1.7
3.4
5.1
SEC.
6.8
8.5
10.2
LESS EXPERIENCED
TECHNICIAN
EXPERIENCED
TECHNICIAN
LESS EXPERIENCED
TECHNICIAN
EXPERIENCED
TECHNICIAN
400
M.V.
400
M.V.
0
1.7
3.4
5.1
SEC.
6.8
8.5
10.2
Figure 2.
When accurate setting is required, a multiturn trimmer
can generally be set faster than a single-turn.
General Guidelines for Guarding Against Component Damage
To minimize temperature shock
Pre-heat boards to maximum acceptable level
Reduce time in solder
To avoid heating components above their maximum rated
temperature
Use lowest acceptable solder temperature
Use maximum allowable conveyor speed
Limit pre-heat temperature to maximum necessary
To limit time of exposure above rated temperature
Limit time in solder
After solder operation, cool board to wash temperature
before it enters wash
To minimize temperature difference between top and bottom of
board
Apply pre-heat to both top and bottom
To reduce temperature shock on entering the moist environ-
ment of the wash
Use wash/rinse temperature as near component
temperature as possible
Extend time between solder process and wash
Cool board after solder operation, prior to entering wash
To minimize temperature variations as component travels
through moisture
Minimize number of wash/rinse and rinse/dry cycles
Use heated air for air knives (to counter evaporative
cooling effect)
Minimize difference between wash and rinse temperature
To minimize exposure to high-pressure water during board
wash
Select trimmer models with pin styles that orient the
rotor seal area away from exposure to the high-pressure
water stream
SETTABILITY
Settability refers to the ease with which a trimmer can be set
accurately to the position that produces the desired circuit condition.
Where the requirement is for obtaining a highly accurate set-
ting the preference is for cermet — because a small incremental
adjustment in a wirewound unit does not always produce the
expected change in output as the wiper moves off one turn of wire
and onto another.
Setting accuracy is better with a multiturn unit than with a
single-turn. This is especially true when the speed of setting is also
a requirement as on a production line (Figure 2).
Applications/Processing Guide
°C/Min.
Rate of Change of Profile
(Indicator of Level of Stability)
7
Unstable Temp
(# of Cycles)
Minutes
Figure 1.
Typical temperature profile for board washing
and soldering.
Critical profile parameters
Temperature Shock (°C)
Maximum Temperature (°C)
Temperature Exposure (Minimum)
Temperature Gradient (°C)
Temperature Shock Decrease in Water (°C)
Temperature Shock Decrease in Water & Air Pressure (°C)
Unstable Temperature (see next page)
7
1
2
3
4
5
6
STABILITY
Stability refers to the ability of the trimmer to remain at the
desired setting. Environmental factors play an important role here:
stability may be affected by temperature exposure, thermal shock/
cycling, humidity, and mechanical shock or vibration.
This is not a matter of concern in most applications, since
Bourns trimmers exhibit excellent stability under all specified condi-
tions. Stability is most often a concern when cermet trimmers are
used in low current "dry" circuits (50uA amps and below). Under
these conditions the contact resistance may vary, making the wiper
appear unstable. This is most noticeable in some rheostat applica-
tions. This can be avoided by using a wirewound unit, or choosing a
cermet trimmer that has been designed for dry-circuit applications.
Bourns applications engineers can assist you on this and other
questions.
ACCESSIBILITY
When selecting a trimmer and determining its placement on the
board, keep in mind the people who will have to use it. Bourns trim-
mers are available in a wide variety of sizes, shapes, configurations,
and placement of adjustment screws. You will usually find a unit on
which the access for adjustment will be convenient for the user.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
3224W-1-102E 制造商:Bourns Inc 功能描述:Trimmer
3224W-1-102E 制造商:Bourns Inc 功能描述:TRIMMER 0.25W 1K 制造商:Bourns Inc 功能描述:TRIMMER, 0.25W, 1K
3224W-1-102G 功能描述:微調(diào)電阻器 - 表面貼裝 4mm 1Kohms 10% Square Cermet Sealed RoHS:否 制造商:Murata 產(chǎn)品:Single-Turn Trimmer Potentiometers 產(chǎn)品類(lèi)型:Single Turn 轉(zhuǎn)數(shù):1 元件類(lèi)型:Cermet 錐度:Linear 電阻:10 kOhms 電壓額定值: 端接類(lèi)型:SMD/SMT 功率額定值:250 mW (1/4 W) 容差:20 % 溫度系數(shù):150 PPM / C
3224W1103E 制造商:Bourns / JW Miller 功能描述:Res Cermet Trimmer 10K Ohm 10% 1/4W 12(Elec)Turn 1.5mm (4.8 X 3.9 X 5.3mm) J-Hook SMD Embossed T/R 制造商:Bourns 功能描述:Res Cermet Trimmer 10K Ohm 10% 1/4W 12(Elec)Turn 1.5mm (4.8 X 3.9 X 5.3mm) J-Hook SMD Embossed T/R
3224W-1-103E 功能描述:微調(diào)電阻器 - 表面貼裝 4mm 10Kohms 10% Square Cermet Sealed RoHS:否 制造商:Murata 產(chǎn)品:Single-Turn Trimmer Potentiometers 產(chǎn)品類(lèi)型:Single Turn 轉(zhuǎn)數(shù):1 元件類(lèi)型:Cermet 錐度:Linear 電阻:10 kOhms 電壓額定值: 端接類(lèi)型:SMD/SMT 功率額定值:250 mW (1/4 W) 容差:20 % 溫度系數(shù):150 PPM / C
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