APL1600-10RFI WELWYN [Welwyn Components Limited], APL1600-10RFI Datasheet - Page 4

• Manufacturer Part Number: APL1600-10RFI
• Description: Tubular Vitreous Enamelled Wirewound Resistors
• Manufacturer: WELWYN [Welwyn Components Limited]

124
Tubular Vitreous Enamelled
Wirewound Resistors
1600/1900 Series
Adjustable Resistors
Adjustable resistors use the same basic construction as fixed
resistors already described, and have a window in the vitreous
enamel through which contact is made to the resistive
element by a sliding contact band. The band is fitted with a
clamping screw and nut to retain it firmly in position.
The adjustable winding style has a maximum permissible hot
spot temperature of 300°C and the maximum dissipation, for
an ambient temperature of 20°C, is specified in Table 4. The
Table 3
Table 4
Manufactured Values
E24 preferred
Standard Selection Tolerance ±10%
All other details of the electrical and environmental
performance of adjustable resistors are the same as for
fixed resistors.
© Welwyn Components Limited
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
Tube
size
1602
1603
1906
1604
1605
1908
1606
1607
1608
1609
Type
1602
1906
1603
1604
1605
1908
1607
1606
1608
1609
A mm
max.
20
20
25
25
30
30
30
(see Figure 9)
hot spot
200°C
B mm
max.
9.5
11
16
21
24
34
41
52
74
27
27
32
32
38
38
38
8
Bedlington, Northumberland NE22 7AA, UK
20°C ambient (watts)
Max. dissipation in
dia. mm
Hole C
3.2
3.2
3.7
3.7
3.7
3.7
3.7
hot spot
300°C
15.5
101
145
19
22
31
41
47
66
80
Max. no of
adjusting
bands
1
3
2
4
2
3
5
partial open winding necessitates a reduced maximum
resistance, when compared with fixed resistors, and the
resistance range is also defined in Table 4.
More than one adjusting band can be fitted, up to the
maximum number specified in Table 3.
Adjustable resistors are available in termination styles B, 4B,
AP, C, CB and CP, in sizes 1602 to 1609 inclusive and 1906
and 1908 denoted by prefix ‘V’.
styles VC,
Min. for
VCP
11
11
14
17
25
4
4
6
8
6
Resistance range (ohms)
all other
Min. for
styles
Welwyn Components
10
13
16
24
3
3
6
8
6
9
Max. for
all styles
13.2k
15.4k
25.5k
1.6k
2.5k
3.0k
5.3k
4.5k
7.5k
8.1k
Issue E · 10.05