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Electrical Resistance Standard

Technical Information

Catalogue No: C1027
Category: General Purpose
Object Type: Test Equipment
Object Name: Electrical Resistance Standard
Part No: RS1
Serial No: 6296
Manufacturer: Croydon Precision Instrument
Division: Unknown
Year of Manufacture: circa 1960
Dimensions: Width (mm): 115
Height (mm): 160
Depth (mm): 115
Weight (g): 760
Location: Rack RAA07 [Main Store]

Resistance Standard
Type RS1
No 6296
400 Ohms
0.16 Amp
Croydon Precision Instrument Co
Made in England
Elliott Bros. (London) Ltd
Serial IN578


This is a 4-terminal resistance standard; 10000 ohm 0.03 amp rated at just over 10 watts. Two of the terminals have Dymo-tape labels ("IO." and "II."), probably the current-input terminals; the other two are unmarked but are probably the voltage-sensing terminals. It also has a shield terminal, a recess for a thermometer and a plunger with knob (used to agitate the internal coolant to ensure even temperature distribution).

The unit is also marked in red paint with "F.A.T." (Factory Acceptance Test)

Click to enlarge