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3
Installation

Installation and Operation Checklist

Check the Output Compensation
Check that the output compensation of the dc source is appropriate for your application. Refer to
“Output Compensation” in this chapter.
High mode provides the best transient response and can be used with phones having input capacitances
from 5 to 12000µF. Note that if the last two digits on the front panel display are fluctuating when the
phone is in standby, you may want to set the output compensation to Low mode.
Low mode is used when testing phones having input capacitances from 0 to 12000µF. Standard dc
sources are factory-set to Low mode.
Check the Phone Connections
If you ARE remote sensing, are the + and − sense leads connected ONLY at the test fixture and
within 20 inches of the phone contacts? For best performance, the distance from sense lead termination
to the phone contacts should be as short as possible. Refer to “Lead Resistance” in this chapter. If your
unit has a remote sense switch on the back, make sure it is set to the Remote position (out).
If you are NOT remote sensing, are the sense jumpers installed in the output connector? Ensure
that the output connector plug is installed in the unit with its supplied sense jumpers in place. Without
sense jumpers, the unit goes into a protect state with the output disabled. If your unit has a remote sense
switch on the back, you don't need sense jumpers. Make sure the switch is set to the Local position (in).
Check the Operating Settings and Conditions
Are you able to communicate remotely with the dc source? If not, check that the address is set
correctly. Refer to “GPIB Address” in the User’s Guide. If your unit has both SCPI and COMP language
settings, check that the programming language is set correctly. Refer to “Language setting” in chapter 5.
Is the Prot or Err annunciator on the front panel on? If yes, clear the fault condition before
continuing. Refer to “Clearing Protection” in chapter 5.
Is the Overvoltage circuit shutting the unit down? If yes, you can disable the overvoltage circuit.
Refer to “Clearing Protection” in chapter 5.
Are the front panel readings unstable? If yes, check that the front panel sampling rate is correct.
Also check the setting of the output compensation. Refer to “Front Panel Measurements” in chapter 5
and “Output Compensation” in this chapter.
Additional Agilent 66311/66309 Operating Settings Checks
Are you measuring dynamic output currents? If yes, check that the current detector is set to
ACDC. Refer to “Front Panel Measurements” in chapter 5.
Are you measuring output currents under 20 mA? If yes, check that the current range is set to
LOW. Refer to “Front Panel Measurements” in chapter 5.