Keithley 2308, Руководство пользователя

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13-14 Return to Section Topics 2308-900-01 Rev. A / July 2008
Section 13: Calibration Model 2308 Portable Device Battery/Charger Simulator User’s Manual
11. Connect the characterized 3 k
Ω
resistor in place of the 4
Ω
resistor ( Figure 13-3 ).
12. Make sure the DMM DC volts function and auto range are still selected.
13. Send the following command to output approximately 5 mA for 5 mA full-scale calibration:
:CAL:PROT:STEP
19
14. Note and record the DMM voltage reading, then calculate the current from the voltage
reading and actual 3 k
Ω
resistance value. Send that current value as the parameter for the
following command:
15.
:CAL:PROT:STEP
20
<Calculated_Current>
For example, if the current value is 4.5 mA, the command would be
:CAL:PROT:STEP20 4.5e-3
Step 4: Program calibration date
Use following command to set the calibration date:
:CAL:PROT:DATE <yyyy>, <mm>, <dd>
Note that the year, month, and date must be separated by commas. The allowable range for the
year is from 2008 to 2107, the month is from 1 to 12, and the date is from 1 to 31.
Step 5: Save calibration constants and lock out calibration
Calibration is now complete, so you can store the calibration constants in EEROM by sending the
following command:
:CAL:PROT:SAVE
After saving constants, lock out calibration by sending:
:CAL:PROT:LOCK
NOTE Calibration will be temporary unless you send the SAVE command. Calibration
data will not be saved if (1) calibration is locked, (2) invalid data exists, or (3) all
steps were not completed in the proper sequence. In that case, the unit will
revert to previous calibration constants.
Table 13-3
Remote calibration summary
Step
*
Command Description
Test
connections
**
:CAL:PROT:CODE ‘KI002308’ Unlock calibration. None
:CAL:PROT:INIT
Initiate calibration. None
0
:CAL:PROT:STEP0 14
Full-scale (14 V) output. Figure 13-1
1 :CAL:PROT:STEP1 <DMM_Reading> Full-scale output cal. Figure 13-1
2 :CAL:PROT:STEP2 <DMM_Reading> Full-scale measure cal. Figure 13-1
*
Step numbers correspond to :STEP commands. Steps 0 through 11 calibrate battery channel (#1). Steps 12 through
20 calibrate charger channel (#2).
**
Connect to OUTPUT #1 terminals for Steps 0 through 11. Connect to OUTPUT #2 terminals for Steps 12 through
20.