PF1352 USER MANUAL REV A 12/21/15
4.3.9
Set the DUT output voltage to zero and the output frequency to 100Hz. Connect the 12
ohm load (or closest value available) to the output of the DUT. Make sure the range is
set to low (0-135V). Set the
MODE
to adjust voltage in 0.1 or 1.0 volt steps. Using the
DUT voltage
UP
key, adjust the output to provide the currents listed in table 4-5. In each
case, confirm that the displayed current matches the current indicated on the external
wattmeter (+/- 1% of reading, +/- 0.5 amps).
TABLE 4-5
DISPLAYED
SETTING
MEASURED
OUTPUT AMPS
LIMITS
1.0A
.91A - 1.1A
2.0A
1.88A – 2.12A
5.0A
3.85A – 5.15A
7.5A
7.32A – 7.67A
10.0A
9.8A – 10.2A
4.3.10
With the 12 ohm load applied set the output voltage of the DUT to provide output the
powers levels listed in table 4-6. At each setting, confirm that the output power
reading on the DUT agrees with the external wattmeter. These values should be within
2.5% of r/- 1 digit.
TABLE 4-6
APPLIED
LOAD
DISPLAYED
WATTS
MEASURED
WATTS
LIMITS
250W
242 - 257
500W
487.5 - 512.5
750W
730.3 - 769.7
1200W
1169 - 1231
Note:
When checking the power measurements, adjust the voltage to provide the indications
in the column label “Applied Load”. The actual value applied should be as close as
possible but these levels are approximate.
.
