User's Manual

User Manual
Version 1.1
2011-10-21
Radio modules deRFarm7
dresden elektronik
ingenieurtechnik gmbh
Enno-Heidebroek-Str. 12
01237 Dresden / Germany
Tel.: +49 351 – 31 85 00
Fax: +49 351 – 3 18 50 10
[e-mail]
www.dresden-elektronik.de
Page 13 of 31
6. Soldering profile of deRFarm7
Table 5 gives the soldering profile for the radio modules.
Table 5: Soldering Profile
Profile Feature Values
Average-Ramp-up Rate (217°C to Peak) 3°C/sec max.
Preheat Temperature 175°C ±25°C 120 sec. max
Temperature Maintained Above 217°C 60 sec.
Time within 5°C of Actual Peak Temperature 20 sec. to 40 sec.
Peak Temperature Range 260°
Ramp-down Rate 6°C/sec max.
Time 25°C to Peak Temperature 8 min. max.
Figure 9 shows a recorded soldering profile for a radio module. The blue colored line illus-
trates a temperature sensor placed next to the soldering-contacts of the radio module. The
pink line shows the set temperatures depending on the zone within the reflow soldering ma-
chine.
40
60
80
100
120
140
160
180
200
220
240
260
280
0
20 40 60 80
100 120 140 160 180 200 220 240 260 280 300 320 340 360
t [s]
T [°C]
Measured Temp. Zone Temp.
Figure 9: Recorded soldering profile
A solder process without supply of nitrogen causes a discoloration of the metal RF-shielding.