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B - Performance and Calibration Procedures
Figure B-2. Transient Waveform Voltage Priority
Current Priority Transient Recovery Time
This test measures the time for the output current to recover to within the specified value following a
±1V change in the output voltage. The test setup uses a 0.47
generator to form an approximate 25
NOTE:
Turn off the output of the dc source before connecting the function generator.
Action
1.
Turn off the dc source and connect the output as in Figure B-1f with
the function generator across the HI and LO terminals. Remember to
connect the capacitor (0.47 µ F) close to the function generator. Keep
all leads as short as possible.
2.
Turn on the dc source and program the Current Priority mode.
Program the current to zero amps.
Program the Function Generator as follows:
3.
Frequency = 400Hz to 1kHz
Wave shape = ± 1V square wave.
Set the Tektronics current probe to measure current at 2mA/div.
4.
Adjust the oscilloscope for a waveform similar to that in Figure B.
The output current should return to within ± 1mA in less than 90 µ s.
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 Current Priority Transient
Response Current.
96
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µ F
µ
s time constant with the 50 ohm output of the function generator.
Duty cycle = 50%
capacitor across the output of the
Program Commands
"OUTP OFF,(@1)"
"OUTP ON,(@1)"
"SOUR:FUNC:MODE CURR,(@1)"
"CURR 0,(@1)"
tttt
v
v
t
Unloading
Transient
Loading
Transient
t
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