13-12
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2308-900-01 Rev. A / July 2008
Section 13: Calibration
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Step 2: Perform battery channel calibration steps
1. Connect the OUTPUT #1 SOURCE and SENSE terminals to the digital multimeter, as
shown in
Figure 13-1
(connect and SENSE +, SOURCE - and SENSE -).
2. Send the following command to output 14 V:
:CAL:PROT:STEP0 14
3. Note and record the DMM reading, then send that reading as the parameter for the following
command:
:CAL:PROT:STEP1 <DMM_Reading>
For example, if the DMM reading is 14.012 V, the command would be:
:CAL:PROT:STEP1 14.012
4. Note and record a new DMM reading, then send that reading as the parameter for the
following command:
:CAL:PROT:STEP2 <DMM_Reading>
5. Connect the Model 2308 OUTPUT #1 SOURCE terminals to the DMM volts input and
characterized 4
Ω
resistor, as shown in
Figure 13-2
. Be sure to observe proper polarity
( to INPUT HI; SOURCE - to INPUT LO).
6. Make sure the digital multimeter DC volts function and auto-ranging are still selected.
7. Send the following command to output 1.9 A for 5 A full-scale calibration:
:CAL:PROT:STEP
3
1.9
8. Note and record the DMM voltage reading, then calculate the current from that reading and
characterized 4
Ω
resistor value. Send the following command using that calculated current
as the parameter:
:CAL:PROT:STEP
4
<Calculated_Current>
For example, with a current value of 1.894 A, the command would appear as follows:
:CAL:PROT:STEP
4
1.894
9. Note and record a new DMM voltage reading, then again calculate the current from the
voltage and resistance. Send the calculated current value as the parameter for the following
command:
:CAL:PROT:STEP
5
<Calculated_Current>
10. Send the following command to output 450 mA for 500 mA full-scale calibration:
:CAL:PROT:STEP
6
11. Send the following command to output 450 mA for 500 mA full-scale calibration:
:CAL:PROT:STEP
7
<Calculated_Current>
For example, if the current value is 450 mA, the command would be:
:CAL:PROT:STEP7 450e-3
NOTE
Allow the Model 2308 to complete each calibration step before going on to the
next one (see
Detecting calibration step completion
).
When calibrating the Battery channel (#1), make sure you connect the
and source - to the same pair of pins (either both in or both out) on the
connector. Do not mix them because the internal resistance present on the
inner pins will cause incorrect verification data to be returned.
NOTE
At this point, the source output is turned on and will remain on until calibration is
completed or aborted with the
:CAL:PROT:LOCK
command.
Summary of Contents for 2308
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