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B - Performance and Calibration Procedures
4.
Read back the N3280A status to be sure that it's in the CV mode. This
query should return a Bit value of " 1 " for CV mode.
If it is not in CV mode, adjust the load or the output voltage slightly
until the unit goes into CV mode.
5.
Adjust the transformer to the lowest rated line voltage.
(e.g., 104 Vac for a 120 Vac nominal line voltage input).
Set the DVM to the 10V range, and record the output voltage reading on
the DVM. (low-line value)
6.
Adjust the transformer to the highest rated line voltage.
(e.g., 127 Vac for 120 Vac nominal line voltage input).
Record the output voltage reading on the DVM. (high-line value)
7.
The difference between the low-line and the high-line value is the source
effect voltage and should be within the limits listed in the performance
test record card under Voltage Priority Source Effect Voltage.
Voltage Priority, +Current Limit Source Effect
Action
1.
Connect the ac input of the dc source to a variable voltage transformer
(or ac source). Set the transformer to nominal line voltage.
Connect the output as shown in Figure B-1a with an ammeter directly
across the Hi and Lo output terminals.
2.
Turn on the dc source and program the output voltage to the maximum
positive value (+10.25V), and the current limit to 0.5A.
3.
Read back the N3280A status to be sure that it's in the + CL mode. This
query should return a Bit value of " 2 " for + CL mode.
4.
Adjust the transformer to the lowest rated line voltage
(e.g., 104 Vac for a 120 Vac nominal line voltage input).
Set the ammeter to the 1A range, and record the current reading on the
ammeter. (low-line value)
5.
Adjust the transformer to the highest rated line voltage
(e.g., 127 Vac for 120 Vac nominal line voltage input).
Record the current reading on the ammeter. (high-line value)
6.
The difference between the low-line and the high-line values is the
source effect voltage and should be within the limits listed in the
performance test record card under Voltage Priority Source Effect
+Current Limit.
Voltage Priority, -Current Limit Source Effect
Action
1.
Connect the ac input of the dc source to a variable voltage transformer
(or ac source). Set the transformer to nominal line voltage.
Connect the output as shown in Figure B-1a with an ammeter directly
across the Hi and Lo output terminals.
2.
Turn on the dc source and program the output voltage to the maximum
negative value (–10.25V), and the current limit to 0.5A.
92
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"STAT:OPER:COND? (@1)"
Program Commands
"OUTP ON,(@1)"
"VOLT 10.25,(@1)"
"CURR:LIM 0.5,(@1)"
"STAT:OPER:COND? (@1)"
Program Commands
"OUTP ON,(@1)"
"VOLT -10.25,(@1)"
"CURR:LIM 0.5,(@1)"
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