2.
Specifications.
Output current:
30 mA 10%, continuously adjustable
Voltage compliance:
35 V
109 ohms, or greater
Output resistance:
Better than 0.1 ppm for 100-ohm change in load
Line regulation:
Better than 1 ppm for 5% change in line voltage
Stability:
1 ppm/24 hrs + external standard cell instability
109 ohms, or greater
Isolation from line:
Power requirements:
105-125 Vac, 50/60/400 Hz, 35 VA
Dimensions:
6 1/2 in wide x 7 1/2 in high x 13 in deep
(16.5 cm x 19.0 cm x 33.0 cm)
Weight:
19 lbs (8.6 kg) net
26 lbs (11.9 kg) shipping
3.
Installation. The CCS should be placed in a convenient position on a
firm, level surface which is free from vibration.
It should be located
close to the equipment with which it will be used (for example, a
potentiometer and/or standard cell enclosure), so that the operating
controls may be easily reached.
4.
Initial setup and electrical checks.
When using the instrument for
the first time, and before making any electrical connections, turn the
instrument through 90 onto its left side, then return it to the normal
upright position.
This procedure will remove any air bubbles in the
galvanometer damping fluid that may have become trapped behind the lens
during shipment.
5.
Operation.
No special precautions are required when operating the
CCS; however, it is recommended that, in order to minimize thermal EMFs,
only solid pure copper wire be used for all connections.
Guildline
Instruments SCW wire is ideal for this purpose. Stranded or tinned wire, or
lugs, should not be used.
a. Controls and indicators (fig 2-6).
(1) Current controls.
Four thumbwheel switches provide a coarse
current adjustment and a 10-turn variable control provides a fine adjustment.
Note that the thumbwheel switches are not calibrated directly in terms of
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