3811 [TTELEC]
Ultra-High Value Precision Resistors; 超高价值精密电阻
| 型号： | 3811 |
| 厂家： | 
TT Electronics |
| 描述： | Ultra-High Value Precision Resistors |
| 文件： | 总2页 (文件大小：396K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ultra-High Value
Precision Resistors
Welwyn Components
3810 Series
• Resistance range up to 100 T ohms
14
(10 ohms)
Designed for low current (pica ampere level)
measurements
•
Low voltage coefficient
•
Hermetically sealed
•
Leakage current minimised by hermetic
sealing and guard ring
•
Electrical Data
3810
3811
3812
1T to 100T
1000
Resistance range
ohms
volts
100M to 1T
500
100M to 1T
1000
Limiting element voltage
TCR (20°C to 70°C)
Resistance tolerance
Values
ppm/°C
%
-500 to -3500
1, 2, 5, 10
E24 preferred
-40 to 100
10, 20
1T to10T; 2, 5,10 >10T; 5,10
Ambient temperature range
°C
Physical Data
Dimensions (mm) & Weight (g)
PCB
d nom mounting
Centres Radius
Min.
Type
L max
D max
f min
Bend Wt. nom
d
D
3810
3811
3812
25.0
42.9
48.0
6
6
6
30
30
30
0.6
0.6
0.6
29.2
47.1
52.2
0.6
0.6
0.6
1.5
2.2
2.5
L
f
Construction
Marking
The Cermetox® resistive film is fired onto high quality ceramic
substrate; brass end caps are forced fitted to the substrate
which is then adjusted to value with a helical cut in the film;
the leads are mechanically locked into the end caps and the
assembly sealed into the glass envelope. All close tolerance
units utilise two resistors connected in series within the glass
envelope. The guard band is described, with application
notes, in a Product Information sheet, available on request.
The serial number, resistance value and tolerance code are legend
marked. The resistance value marking conforms to IEC 62.
Solvent Resistance
The glass envelope is coated with silicone and should not be
subjected to solvents or their vapours. (See Application
Notes.)
Terminations
Material
Solder-coated Dumet wire.
Strength
The terminations meet the requirements of
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue D · 03.06
203
Ultra-High Value
Precision Resistors
3810 Series
Welwyn Components
Performance Data
Maximum
Typical
Load at rated voltage: 1000 hours at 20°C
Shelf life: 12 months at room temperature
Resistance to solder heat
∆R%
∆R%
∆R%
pF
2
1
1
0.5
0.2
<0.1
3810
0.4
0.2
Capacitance
3811
pF
Voltage coefficient of resistance
ppm/volt
100MΩ
-20
1TΩ
100TΩ
Measured at voltages
of 100 and 500 volts
3810
3211
3812
-160
-80
-10
-150
-150
-10
-80
Application Notes
Each resistor is packed with a card stating nominal resistance
value at 100 V applied, selection tolerance, date and serial
number.
Guard Band
For details of how to use the guard band, fitted to resistors of
100 G ohms and over, ask for Product Information Sheet
detailing application notes for glass sealed resistors with
guard band.
Although the glass envelope is an excellent insulant and
would be adequate in a dry atmosphere, the condensation
which occurs in a normal atmosphere will provide a shunt
resistance which will modify the very high resistance value. To
minimise this effect all units are coated with silicone, and it is
essential that this coating is not damaged; any handling
should be by the terminations. For the same reason solvents
must not be used.
Non-standard versions
Units without glass envelopes but with lacquer protection are
available, but will have a limited electrical performance.
Measured values at a voltage other than 100V may be
recorded.
The resistors should not be used in a damp atmosphere. If
moisture develops on the body the resistor should be dried
for 30 minutes at 70°C and allowed to cool for a further 30
minutes in a dry atmosphere.
For non-standard items contact Welwyn Components.
Packaging
Each resistor is individually packed in a polythene envelope
together with a card carrying measurement details and serial
number (See Application Notes).
To avoid damage to the seal between terminations and glass,
the leads must be fully supported inside the point of bending
during any preforming.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue D · 03.06
204
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