Keithley 2308, Руководство пользователя

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2308-900-01 Rev. A / July 2008 Return to Section Topics 2-11
Model 2308 Portable Device Battery/Charger Simulator User’s Manual Section 2: Basic Power Supply Operation
• Current limit on either range can be quickly set to the minimum value (0.006 A) by
decrementing the first leading zero of the reading. If there is no leading zero, decrement the
units digit.
Editing restrictions
The following editing restrictions are in effect when the output is ON:
• You cannot increment a digit that would display a value that jumps to the maximum. For
example, for the value 14.200 V, you cannot increment the “1” or the “4” since the resultant
value would exceed 15.000 V.
• When decrementing a digit, only that digit and digits to the left are affected. The digits to the
right of the cursor are not changed.
Using the OPERATE key
Use the OPERATE key to control power supply output. This key toggles the output ON and OFF
for the active channel even if output status is not displayed. To display the output status for the
active channel, place the unit in readings or set mode (the output status is not shown in display
type menu, main menu, or submenus). When output status is displayed, ON or OFF will appear in
the upper right hand corner of the display.
Output bandwidth
The battery and charger channel’s output bandwidth control has HIGH and LOW settings. The
HIGH setting will result in the fastest response with dynamic loads but, could be unstable with
certain loads. The LOW setting mode will have a slower response but will be stable for most loads.
Testing the performance of the battery charger circuitry in a handset does not require the high
bandwidth performance in Channel 1 or Channel 2 of the Model 2308. Since a charger circuit is a
voltage regulated circuit, it resembles a high capacitance load to the output of the Model 2308. For
this type of application, the LOW bandwidth output mode provides increased stability and
eliminates oscillations that may occur.
The bandwidth can be user-programmed at any time. However, if the output is OFF, the output
bandwidth is automatically set to LOW as summarized in
Table 2-2 .
NOTE
Pressing the OPERATE key is channel-specific. The number after the number
sign (#) indicates the channel affected by the OPERATE key.
NOTE
DVM measurements can be performed with the output OFF on the charger
channel.
Table 2-2
Output bandwidth channel setting
Output Bandwidth
ON LOW or HIGH
(user selectable)
OFF LOW