Installation - 3

OVP Considerations

CAUTION: Disabling the OVP protection circuit may cause excessive output voltages, such as can occur if the remote sense leads are shorted, to damage the equipment under test.

The dc source is shipped from the factory with its overvoltage protection circuit enabled. You can disable the OVP circuit using either the front panel VOLT PROT command located in the OV menu, or the VOLTage:PROTection:STATe SCPI command as explained in chapter 8.

The OVP circuit contains a crowbar SCR, which effectively shorts the output of the dc source whenever the OVP trips. However, if an external current source such as a battery is connected across the output and the OVP is inadvertently triggered, the SCR will continuously sink a large current from the battery, possibly damaging the dc source.

To avoid this, either disable the OVP circuit or program it to its maximum value to prevent it from inadvertently tripping. Additionally, you can connect an external protection diode in series with the output of the dc source. Connect the anode of the diode to the + output terminal.

The OVP circuit’s SCR crowbar has also been designed to discharge capacitances up to a specific limit, which is 50,000 μF. If your load capacitance approaches this limit, it is recommended that you do not intentionally trip the OVP and discharge the capacitance through the SCR as part of your normal testing procedure, as this may lead to long-term failure of some components.

DVM Connections

CAUTION: The DVM may be damaged if voltages at the input terminals exceed ±50 Vdc to ground.

The DVM connector has three pins: plus, minus, and earth ground. The 3-pin connector is removable and accepts wires sizes from AWG 22 to AWG 14. Disconnect the mating plug by pulling it straight back.

The DVM is designed as an auxiliary measurement input that can measure voltages on circuits that are powered by the main output (output 1). Voltage measurements can be made on test points inside the phone under test, or on test points located on the test fixture that is connected to the main output. Figure 3-7 illustrates a common measurement application for the DVM. This example is only provided for illustration; your specific application will vary depending on the type of test and type of phone.

 

 

 

Test Fixture

 

Agilent 66309D

 

 

 

 

Agilent 66311D

 

lead resistance

 

 

 

+ load

+

 

 

 

current

 

OUTPUT 1

 

 

battery

 

 

 

connector_

 

 

 

lead resistance

LOAD

 

−

 

 

Minus

 

connector for

 

terminal

 

 

 

 

 

 

internal phone

 

 

V common mode

circuits

 

DVM INPUT

-4Vdc < (V comon mode) < +25Vdc

Figure 3-7. DVM Measurement Example

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Agilent Technologies 66111A, 66311B, 66309B manual DVM Connections, OVP Considerations
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66111A, 66309B, 66311B, D specifications

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