Output Compensation

3 - Installation

High bandwidth performance and stability are achieved by using a software-switchable output compensation circuit. This compensation circuit has two bandwidth positions to optimize the response for two different ranges of phone capacitance. The compensation function is set using either the front panel TYPE:CAP command located in the Output menu (see chapter 5), or the OUTput:TYPE[:CAPacitance] SCPI command as explained in chapter 8. The circuit covers the following capacitance ranges:

♦Low Mode: 0 to 12,000 μF

♦High Mode: 5 μF to 12,000 μF

♦H2 Mode: keeps the unit in High mode at all times

The dc source is shipped from the factory with the output compensation set to Low Mode. If you do not know the input capacitance of the phone that you are testing, leave the input capacitance set to Low Mode initially. This is because in Low Mode, the output of the dc source will be stable when testing cellular phones that have virtually any input capacitance (from 0 μF to 12,000 μF). Low mode however, has a slower transient response (see appendix A).

The High Mode output compensation setting provides faster transient response performance for phones with input capacitances greater than 5μF. (Most phones have input capacitances greater than 5 μF.) In High mode, operation of the dc source may be momentarily unstable with phones that have input capacitances less than 5 μF, or if the output sense leads are not connected. Note that if the dc source senses that there is no load on the output, it will automatically switch from High compensation mode to Low compensation mode.

H2 Mode is an additional compensation mode that guarantees that the dc source stays in High compensation mode at all times. This mode may be the optimal setting in cases where a large capacitor is connected across the phone input and output 1 is sinking current. (H2 mode is not available in earlier dc source units.)

Use the output sense detect circuit to first determine that the sense and load leads are properly connected to the device under test. Then, if you are testing phones in High Mode and want to determine if the input capacitance of your phone is less than 5 μF, perform the following test.

NOTE: It is important that this test is done with the dc source installed in the test system where it will be used, since system stability is also dependent on wiring and the phone impedance.

1.Connect the phone to the dc source and place it in standby mode.

2.Check the last two digits of the voltage reading on the front panel of the dc source.

3.If the last two digits are fluctuating, it is an indication that the phone capacitance may be less than 5 μF and the dc source is momentarily unstable.

4.Place the output compensation of the dc source in Low Mode.

5.If the last two digits of the voltage reading are now stable, your phone has an input capacitance less than 5 μF.

66111A, 66309B, 66311B, D specifications

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