Cal Power TrueWave TW1750, Руководство по обслуживанию

Страница: 59 / 84

SERVICE MANUAL CALIBRATION
3-23
Wait for the phase angle measurement to stabilize on the counter timer. Record the
phase angle as
RDGN4 .
Set the TW frequency to 320 Hz:
SOUR:FREQ 320.0
Wait for the phase angle measurement to stabilize on the counter timer. Record the
phase angle as
RDGN5 .
Set the TW frequency to 60 Hz and output off:
SOUR:FREQ 60.0
OUTP OFF
Calculate the phase angle compensation values:
VALUE1 = -1.0 * RDGN1
VALUE2 = -1.0 * RDGN2
VALUE3 = -1.0 * RDGN3
VALUE4 = -1.0 * RDGN4
VALUE5 = -1.0 * RDGN5
Update the phase A offset calibration data via the GPIB:
CAL:UNIQ:OPHA VALUE1 VALUE2 VALUE3 VALUE4 VALUE5
3.16 PHASE A TO PHASE B CALIBRATION
Note: this calibration step only applies to TW3500 and TW5250 systems.
Connect the counter timer channel 1 to the TW’s A phase through a 10:1 resistor
divider. Connect the counter timer channel 2 to the TW’s B phase through a 10:1
resistor divider. Set the counter time up to measure phase angle.
Set the TW up for 0 degrees phase A to phase B, low range, local sense, 40 Hz, 120V
and close the output by sending the following GPIB commands:
SOUR2:PHAS 0
SOUR:VOLT:RANGE LOW
SOUR:SENSE LOCAL
SOUR:FREQ 40.0
SOUR:VOLT 120.00
OUTPUT ON
Wait for the counter timer to settle and record the phase angle as RDNG1 .