C&H Technology NHLM - Manual (Page 4)

HL, NHL FLAT and HLM, NHLM
Wirewound Resistors,
Industrial Power, Flat (HL), Miniature Flat (HLM)
Vishay Dale
Document Number: 30209 For technical questions, contact: [email protected] www.vishay.com
Revision: 13-Jul-07 75
Derating is required for ambient temperatures above 25 °C per the following graph.
- 65 - 50 0 50 150 250 350
AMBIENT TEMPERATURE IN
°
C
120
100
80
60
40
20
0
%
N I
R
E
W
O
P
D
E
T
A
R
Derating
25
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock
Rated power applied until thermally stable,
then a minimum of 15 min at - 55 °C
± (2.0 % + 0.05 Ω) ΔR
Short Time Overload 10 x rated power for 5 s ± (2.0 % + 0.05 Ω) ΔR
Dielectric Withstanding Voltage 1000 V
rms
, 1 min ± (0.1 % + 0.05 Ω) ΔR
Low Temperature Storage - 55 °C for 24 h ± (2.0 % + 0.05
Ω) ΔR
High Temperature Exposure 250 h at + 350 °C ± (2.0 % + 0.05
Ω) ΔR
Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (2.0 % + 0.05
Ω) ΔR
Shock, Specified Pulse MIL-STD-202 Method 213, 100 g's for 6 ms, 10 shocks ± (0.2 % + 0.05 Ω) ΔR
Vibration, High Frequency Frequency varied 10 to 2000 Hz, 20 g peak, 2 directions 6 h each ± (0.2 % + 0.05 Ω) ΔR
Load Life 1000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF” ± (3.0 % + 0.05
Ω) ΔR