4
SCA Series
4
Maintenance
3.2.2 Intermediate Capacitors - from
1 nF to 1 µF
Intermediate SCA capacitors have 3 binding posts
--
HI
,
LO
, and
GND
-- as shown in
fi
gure 3-3.
Figure 3-3: Intermediate SCA capacitor
standard with 3 binding posts
These intermediate values are connected the same
way as low capacitances (Section 3.2.1), except they
use binding posts because lead and stray resistances
are less critical.
3.2.3 High capacitors - 1.9 µF and over
High SCA capacitors have 5 binding posts --
HI
CURRENT
,
HI SENSE
,
LO CURRENT
,
LO
SENSE
,
and
GND
-- as shown in
fi
gure 3-4.
Figure 3-4: High SCA capacitor standard with
5 binding posts
This 4-terminal connection circuit has special wiring
and low-resistance conductors to minimize dissipa-
tion and parasitic inductance, and improve frequency
characteristics. See Figure 3-5. To use as a 2-terminal
capacitor, connect to only the two
SENSE
terminals.
C
HL
C
LG
C
HG
CURRENT
LOW
SENSE
LOW
CURRENT
HIGH
SENSE
HIGH
GND
Figure 3-5: SCA as a 5-terminal capacitor
To use as a 2-terminal capacitor, connect to only the two
SENSE terminals.
3.3 Environmental
Conditions
3.3.1 Operating
Temperature
For optimal accuracy, SCA models should be used
in an environment of 23°C ±5°C. They should be
allowed to stabilize at those temperatures after any
signi
fi
cant temperature variation.
3.3.2 Storage
Temperature
The SCA units should be maintained within the stor-
age temperature range of 0°C to 40°C to retain its
accuracy within the speci
fi
ed limits.
3.4 Shipping and Handling
The SCA Series should not be exposed to any excessive
shock or temperature extremes. The option SRC-100, a
lightweight transit case capable of storing two SCA units,
is recommended for shipping or transporting the models.
