Accutrim™ 1202
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63055
4 Revision: 25-Mar-10
Notes
(1)
Preferred termination style for current 1-1/4 inch rectilinear
trimmers (staggered PC pins present a sturdier mounting
arrangement for shock, vibration, and impact situations).
(2)
10 Ω at ± 5 % available on special order.
(3)
Maximum TCR applies to the 3 σ (sigma) limit or 99.73 % of a
production lot. (Measured end-to-end with wiper off the
element.)
(4)
Measurements of TCR through the wiper are influenced more by
setting stability and the percentage of the total resistance in use
(at the wiper) than by fundamental resistance change due to
temperature alone. The parameter shown in Table 3 is a 2 σ
distribution typifying the behavior of the device when used with
40 % or more of the total resistance in use.
(5)
Derated linearly from full power at + 85 °C to zero power at
+ 150 °C. See Figure 3 in this datasheet.
(6)
All ΔR’s are measured to the tolerance specified + 0.01 Ω.
(7)
Whichever is greater.
(8)
Load-Life test performed at nominal rated power, 0.5 W, at
+ 85 °C.
Special Available Options:
Special marking
Special lengths for lead wires (L, LB Style)
Hooked leads
Alternate bushing and PC combinations
Power conditioning and screening operations
VISHAY TRIMMERS ARE INSPECTED
100 % for:
•Immersion
• Resistance tolerance check
• End resistance
• Visual-mechanical
• Dynamic tests for continuity, CRV
By sample for:
•TCR
•DWV
TABLE 5 - COMPARISON
MIL-PRF-22097/2 CHARACTERISTIC F
(7)
1202 MAXIMUM (Worst Case)
TEST GROUP I
Visual and mechanical
Total resistance
Actual effective electrical travel
End resistance
Contact resistance variation - CRV (noise)
Dielectric withstanding voltage - DWV
Per MIL-STD-202, methods 301 and 105
Atmospheric pressure
Barometric pressure
Insulation resistance
Shaft torque
Thermal shock
No failures
± 10 %
17 to 27 turns
± 2 % or 20 Ω
(7)
± 3.0 % or 3 Ω
(7)
900 V
AC
, 1 min
350 V
AC
, 1 min
≥ 1000 MΩ
8 oz. in. maximum
± 1.0 %
No failures
± 10 %
25 ± 2 turns
2 Ω
3 Ω typical, 10 Ω maximum
900 V
AC
, 1 min
350 V
AC
, 1 min
≥ 1000 MΩ
8 oz. in. maximum
± 1.0 %
TEST GROUP II
Resistance temperature characteristic - TCR
Moisture resistance
Contact resistance variation - CRV (noise)
± 0.01 % (± 100 ppm/°C)
± 1.0 %
3.0 % or 3 Ω
(7)
± 0.001 % (± 10 ppm/°C)
± 0.5 %
3 Ω typical, 10 Ω maximum
TEST GROUP III
Shock (specified pulse)
Vibration (high-frequency)
Contact resistance variation - CRV (noise)
Salt spray
± 1.0 %
± 1.0 %
± 3.0 % or 3 Ω
(7)
No corrosion
± 0.5 %
± 0.5 %
3 Ω typical, 10 Ω maximum
No corrosion
TEST GROUP IV
Solder heat
Life (1000 h at + 85 °C)
(8)
Contact resistance variation - CRV (noise)
± 1.0 %
± 2.0 %
± 3.0 % or 3 Ω
(7)
± 0.05 %
± 0.5 %
3 Ω typical, 10 Ω maximum
TEST GROUP V
Low-temperature operation
High-temperature exposure
Contact resistance variation - CRV (noise)
± 1.0 %
± 2.0 %
± 3.0 % or 3 Ω
(7)
± 0.5 %
± 0.5 %
3 Ω typical, 10 Ω maximum
TEST GROUP VI
Rotational life
Contact resistance variation - CRV (noise)
Terminal strength
± 2.0 %
± 3.0 % or 3 Ω
(7)
2 lbs
± 2.0 %
3 Ω typical, 10 Ω maximum
2 lbs
TEST GROUP VII
Solderability (excluding terminations L and LB)
Immersion (excluding terminations L and LB)
MIL-STD-202 method 208
No continuous stream of bubbles
MIL-STD-202 method 208
No continuous stream of bubbles
TEST GROUP VIII
Fungus
MIL-STD-810 method 508
No mechanical damage
MIL-STD-810 method 508
No mechanical damage
