2-16 Calibration
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.
3. Note and record the DMM reading, then send that reading as the parameter for the fol-
lowing command:
:CAL:PROT:STEP1 <DMM_Reading>
For example, if the DMM reading is 14.012V, 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. Send the following command for DVM full-scale calibration:
:CAL:PROT:STEP3
6. Connect the Model 2303 OUTPUT SOURCE terminals to the DMM volts input and
characterized 4Ω resistor, as shown in Figure 2-3. Be sure to observe proper polarity
(SOURCE + to INPUT HI; SOURCE - to INPUT LO).
7. Make sure the digital multimeter DC volts function and auto-ranging are still selected.
8. Send the following command to output 1.9A for 5A full-scale calibration:
:CAL:PROT:STEP4 1.9
9. Note and record the DMM voltage reading, then calculate the current from that reading
and 4Ω resistor value. Send the following command using that calculated current as the
parameter:
:CAL:PROT:STEP5 <Calculated_Current>
For example, with a current value of 1.894A, the command would appear as follows:
:CAL:PROT:STEP5 1.894
10. 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 follow-
ing command:
:CAL:PROT:STEP6 <Calculated_Current>
11. Connect the characterized 3kΩ resistor in place of the 4Ω resistor. (See Figure 2-4.)
12. Make sure the DMM DC volts function and auto-range are still selected.
13. Send the following command to output approximately 5mA for 5mA full-scale
calibration:
:CAL:PROT:STEP7
14. Note and record the DMM voltage reading, then calculate the current from the voltage
reading and actual 3kΩ resistance value. Send that current value as the parameter for the
following command:
:CAL:PROT:STEP8 <Calculated_Current>
For example, with a current of 4.5mA, the command would be:
:CAL:PROT:STEP8 4.5E-3
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