Section 3
OM6624CT-3000-5-00
11 May, 2016
3-1
3. QUICK MEASUREMENT GUIDE
3.1.
MEASUREMENT OPERATION GUIDE
The Model 6624CT-3000 High Current DC Transformer can be used to measure and monitor high
DC currents up to 3000 A in three ranges. As well, the 6624CT-3000 can be used to determine the
ratio of a high current shunt with that of a low current shunt such that the DC resistance of the high
current shunt can be determined from the known resistance of a low current reference unit.
The following section contains information regarding the measurement ranges and calculations
required to determine high current values and high current shunt resistances. A suitable calibrated
long scale precision Digital Volt Meter is required to make full use of the capabilities of the
6624CT-3000.
NOTE: Sufficient stabilization time must be observed in order to achieve the specified
uncertainty for the Model 6624CT-3000 High Current DC
Transformer.
3.1.1.
Current Measurement all Ranges
The Model 6624CT-3000 can be used to measure test currents and to compare the
resistances of high current shunts. It is only required that a reference shunt of known
resistance be connected on one of the
Burden
output terminals. The
3 A Burden
terminals
are limited to a shunt resistance of 1 ohm or less while the
150 mA Burden
terminals are
limited to a maximum of 10 ohms although less is preferable.
Notes: It is essential that a shorting link is used on the burden output terminals of the
6623A-3S that are not used.
The operator must be familiar with the various modes of operation of the 66259 Extender
Control Unit before using the CS1000 Current Sources as a source of test current. The
66259 Operation Manual and should be reviewed before proceeding.
If a non-Guildline current source is being used the operator should be familiar with its
operation.
The following is a basic step by step procedure for connecting the resistors and for setting
up the 6624CT-3000 properly to make the measurements.
Step 1)
Connect the 6624CT-3000, the 6623A-3S, the reference standard and the
UUT resistor as shown in the Figure 2-4 connection diagram. Use
appropriate cables to carry the currents.
Step 2)
If the CS1000’s are to be used to provide a test current make the connections
as shown in Figure 2-5. Otherwise setup a separate current source directly
through the primary window of the 6624CT-3000 Transformer Unit.
Summary of Contents for 6624CT-3000
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