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Current Priority Ripple and Noise
Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as well
as an ac voltage superimposed on the dc output. PARD is specified as the rms output current in a
frequency range specified in Appendix A.
NOTE:
The voltage limits in Current Priority Mode are not programmable.
Action
1.
Turn off the dc source and connect the output as shown in Figure B-1d
to an ac rms voltmeter. Remember to include a 50 ohm series resistor at
the dc source end of the cable. Also connect a 16k ohm load resistor
across the HI and LO terminals.
2.
Turn on the dc source and program the Current Priority mode. Program
the current to the maximum value (0.5mA).
3.
Read back the N3280A status to be sure that it's in the CC mode. This
query should return a Bit value of " 8 " for CC mode.
4.
Divide the voltage reading ac rms voltmeter by 16k (the value of the
load resistor). The result should be within the limit in the performance
test record card under Current Priority PARD Current.
Transient Response Tests
Voltage Priority, Transient Recovery Time
This test measures the time for the output voltage to recover to within the specified value following a
50% change in the load current using an RC network of a 10
output. The test must be performed in all three bandwidths: 10kHz, 20kHz, and 30kHz.
Action
1.
Turn off the dc source and connect the output as in Figure B-1e with
the oscilloscope across the HI and LO sense terminals. Remember to
connect the RC network (10 µ F & 0.2 ohm).
2.
Turn on the dc source and program the Voltage Priority mode (this is
the default mode). Program the output voltage to the full-scale value
(10.0V), the current to the maximum value (0.5A), and the
bandwidth to 10kHz.
3.
Program the Electronic Load as follows:
Input current = 0.25A
Transient frequency = 2kHz
Transient duty cycle = 50%
4.
Adjust the oscilloscope for a waveform similar to that in Figure B-2.
The output voltage should return to within ± 40mV in less than 60 µ s,
45 µ s, or 35 µ s following a 0.25A to 0.5A load change. Check both
loading and unloading transients by triggering on the positive and
negative slope. Record the voltage at time "t" in the performance test
record card under Voltage Priority Transient Response Voltage.
5.
Repeat steps 2 through 4 for the 20kHz and the 30kHz bandwidths.
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Performance and Calibration Procedures
µ F
capacitor and 0.2 ohm resistor across the
Transient current level = 0.5A
Current slew rate = 0.167A/ µ s
Turn the transient generator on.
Program Commands
"OUTP ON,(@1)"
"SOUR:FUNC:MODE CURR,(@1)"
"CURR 0.0005,(@1)"
"STAT:OPER:COND? (@1)"
Program Commands
"OUTP OFF,(@1)"
"OUTP ON,(@1)"
"SOUR:FUNC:MODE VOLT,(@1)"
"VOLT 10,(@1)"
"CURR:LIM 0.5,(@1)"
"VOLT:ALC:BWID 10000,(@1)"
Loading
tttt
Transient
t
v
v
t
Unloading
Transient
"VOLT:ALC:BWID 20000,(@1)"
"VOLT:ALC:BWID 30000,(@1)"
95
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