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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
Platform(s):
Year of Manufacture:
Dimensions:
Width (mm):
115 
Height (mm):
160 
Depth (mm):
115 
Weight (g):
760 
Location: Archive Object Store
Inscription(s):

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

Notes:

This is a 4-terminal resistance standard 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."

Click to enlarge