- Available in 10 pF, 100 pF,1000 pF, 5000 pF, 10,000 pF
- New 5 nF and 10 nF standards available
- A national laboratory standard
- For calibrating working standards
- Standard for dissipation factor
- 5 year warranty included
- 20 ppm/year stability, history has shown this to be a very conservative specification
- Hermetically sealed in dry nitrogen
- ISO-17025 accredited calibration Included
The GenRad 1404 Series standard capacitors are the standard of choice in metrology labs, and still used today by standards bodies around the world. These
capacitors have been designed as primary reference standards of capacitance with
which working standards can be compared.
In combination with an
accurately known external resistor, the GenRad 1404 standard capacitors becomes
a standard of dissipation factor
All critical parts of the plate assembly
are made of Invar for stability and low temperature coefficient. After heat
cycling and adjustment, the assembly is mounted in a heavy brass container,
which, after evacuation, is filled with dry nitrogen under pressure slightly
above atmospheric and sealed. The container is mounted on an aluminum panel and
protected by an outer aluminum case. Each capacitor is subjected to a series of
temperature cycles to determine hysteresis and temperature coefficients and to
stabilize the capacitance
MODELS
GenRad
/ General Radio 1404-10nF (10,000 pF) Recently
Released
GenRad / General Radio 1404-A (1000 pF) Primary
Standard Capacitor
GenRad / General Radio 1404-B (100 pF) Primary
Standard Capacitor
GenRad / General Radio 1404-C (10 pF) Primary Standard
Capacitor
Calibration: A certificate of calibration is supplied with each
capacitor, giving the measured direct capacitance at 1 kHz, 30 Vac and 23° ±1°C. The measured value is obtained by a
comparison to a precision better than ±1 ppm with
working standards whose absolute values are known to an accuracy of ±5 ppm, determined and maintained in terms of reference standards
periodically traceable to an SI.
Adjustment Accuracy: The capacitance is adjusted before calibration with an
accuracy of ±5 ppm to a capacitance about 5 ppm above the nominal value
relative to the capacitance unit maintained by the reference standards.
Temperature Coefficient of Capacitance: A measured value with and accuracy of ±1 ppm/°C
is given on the certificate.
|
Model |
Temperature
Coefficient |
|
1404-A 1404-B |
2 ±2 ppm/°C from -20°C to
+65°C |
|
1404-C |
5 ±2 ppm/°C from -20°C to
+65°C |
|
1404-5 nF 1404-10 nF |
4 ±2 ppm/°C from -20°C to
+65°C |
Temperature Cycling: For temperature cycling over range from -20°C to +65°C
, hysteresis (retraceable) is less than 20 ppm at
23°C.
Stability:
|
Model |
Long
Term Drift |
Max
Change with Orientation |
|
1404-A 1404-B 1404-C |
less than 20 ppm per year |
10 ppm and completely reversible |
|
1404-5 nF 1404-10 nF |
less
than 40 ppm per year |
10 ppm and completely reversible |
Dissipation Factor: Less than 10-5 at 1 kHz.
Residual Impedance:
|
Model |
CH |
CL |
L |
|
1404-A 1404-B 1404-C |
30 pF |
28 pF |
0.05 µH |
|
1404-5 nF 1404-10 nF |
130 pF |
127 pF |
0.1 µH |
Max Voltage:
|
Model |
Maximum
Voltage |
|
1404-A 1404-B 1404-C |
750 V peak |
|
1404-5 nF 1404-10 nF |
100V peak |
Terminals: Two BNC coaxial connectors (legacy locking G874 coaxial
connectors are available). Outer shell of one connector is ungrounded to permit
capacitor to be used with external resistor as a dissipation factor standard.
Mechanical:
|
Model |
Dimensions |
Weight |
|
1404-A 1404-B 1404-C |
(16.9 cm H x 17.2 cm W x 20.4 cm D (6.63" x 6.75" x 8") |
3.9 kg 8.5 lb 6.4 kg 14 lb Shipping |
|
1404-5 nF 1404-10 nF |
(23 cm W x 23 cm H x 22 cm D) 9" x 9" x 8.5" |
16 kg 35 lb 18 kg 40 lb Shipping |
