3812-10TGI Welwyn Components, 3812-10TGI Datasheet - Page 2

• Manufacturer Part Number: 3812-10TGI
• Description: Ultra-high Value Precision Resistors
• Manufacturer: Welwyn Components

204
Ultra-High Value
Precision Resistors
3810 Series
Application Notes
Each resistor is packed with a card stating nominal resistance
value at 100 V applied, selection tolerance, date and serial
number.
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.
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.
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
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
Performance Data
Ordering Procedure
Example: 3812 at 10 teraohms and 2% tolerance -
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
Packing
Load at rated voltage: 1000 hours at 20°C
Shelf life: 12 months at room temperature
Resistance to solder heat
Capacitance
Voltage coefficient of resistance
3810
3211
3812
I
1%
2%
Individual/Bulk
J
K 10%
5%
100MΩ
-20
-10
-10
Standard
Bedlington, Northumberland NE22 7AA, UK
3
3
8
8
1
1
0
1
-160
1TΩ
-80
-80
ppm/volt
100TΩ
-150
-150
∆
∆
∆
R
R
R
%
%
%
F p
F p
3 8 1 2 – 1 0 T G I
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.
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.
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).
M
a
i x
0
2
1
2 .
m
u
m
Measured at voltages
of 100 and 500 volts
Welwyn Components
0
0
4 .
2 .
y T
<
0
p
0
1
5 .
c i
1 .
l a
Issue D · 03.06