Figure 5-7 INSULATION MODE: Current Too Large. Wayne Kerr 3260B

Advanced Operation 5–11 repetitive measurements until the key is released. To minimize the risk of electric shock, high voltages are applied to the test leads only during testing.

WARNING!

A V O I D T O U C H

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I N G T H E T E S T C O N N E C T

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I O N S

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S U R E M E N

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T R I I M M I I N G O P E R A T I I O N

S. Although the current is limited to a safe level, there is a risk of electric shock, especially at 200V and 500V test levels. Unless energy is stored in components, e.g. capacitors, connected to the measurement terminals, the voltage at the measurement terminals will be removed within 0.5 seconds of test completion.

Unless global measurement conditions are selected (see section 5.18—The SETTINGS Page), the test voltage and other settings may be set differently for each of the three test types.

The insulation test cannot be performed if the test current exceeds 1mA, i.e. if the impedance is too low. This corresponds to a minimum resistance of 100kΩ at 100V, 200kΩ at 200V or

500kΩ at 500V. In this case a message, shown in Figure 5-7, will be displayed.

Figure 5-7 INSULATION MODE: Current Too Large

Note

If the INSULATION soft key is pressed when the insulation option is not fitted, the analyzer will report Unit Not Available (Figure 5-8).

Figure 5-8 Unit Not Available

5.8.1 Connections

Except when using a handler or 4-wire scanner, the standard connection protocol for

TRANSFORMER/TELECOM MODE may be used for all insulation test types. This is shown in Figure 5-2. The tables below show the active connection for each test. Leads marked

not used may be left connected to the analyzer but are not used for the insulation test.

For operation with a 4-wire scanner the scanner relays should be configured as for turns ratio measurement. During Insulation mode operation, set the instrument to 2-terminal operation.

Since a 4-wire scanner is connected to the analyzer with HANDLER MODE lead configuration (see Figure 5-3), it is not possible to perform a primary to secondary winding test.