PF1350 TECHNICAL MANUAL REV 1 2/06/14
4.3.10 CHECK OF LINE AND LOAD REGULATION
Set the DUT to 100V and 60zaHz. The unit should be in the low range (0 -135v) and
powering the 12 ohm load. While monitoring the output voltage on the wattmeter, adjust
the AC line input with the variac from 105 to 250 VAC. Confirm that the DUT output
voltage does not fluctuate more than 0.7volts from the initial set point.
Readjust the AC input to 120V. Set the load to 54 ohms and the DUT range to high,
With the load off, set the output for exactly 200V as measured on the wattmeter.
Connect the 48 ohm load and record the drop in voltage with load. This should be less
than 2.0V. Note that the output voltage shall be measured as close to the output
terminals as practical. The wattmeter voltage sense input should be tied to the rear
panel of the DUT. Failure to do so may cause errors due to wiring voltage drops.
4.3.11 CHECK OF OUTPUT DISTORTION AND NOISE
Set the DUT as follows: RANGE =low, Frequency = 50Hz, output voltage 100V.
Connect the 12 ohm load, distortion meter, and oscilloscope to the output of the DUT.
Measure the distortion (THD) and confirm less than 1.5%.
Set the DUT output to zero using the VOLTS adjust and measure the residual noise
level on the output using the oscilloscope. It should be less than 2.5V peak to peak.
For units with remote control options, see specific appendix at rear of this manual.
