JQE SPECIAL OPR 092611
4-1
SECTION 4 - CALIBRATION
4.1
GENERAL
It is recommended that both output voltage and output current limit calibrations be performed in
sequence, however it is permissible to do only one if the other is known to be calibrated.
Required test equipment is listed in PAR. 4.2. See Table 2-3 and Figure 2-3 for descriptions and
locations, respectively, of the calibration adjustments.
4.2
TEST EQUIPMENT REQUIRED
The following test equipment is required to perform the calibration procedures in this section.
a). Resistive load, variable, with ON/OFF and SHORTING SWITCH and capable of dissi-
pating the full output power of the unit under test.
b). Digital DC voltage monitor (DVM), digital voltmeter, or power supply analyzer.
c). External Programming Resistor used for FS Remote Calibration:
value: 30.1KOhms, tolerance: 0.01%, 0.5W.
d). Precision Current Sensing Resistor (Shunt): 0.01 Ohm, ±0.1%, 100W, 20ppm/°C, with
the value measured to 0.01% accuracy.
e). AC ripple monitor, sensitivity better than 1 mV. Ballantine Model 302C. or Hewlett Pack-
ard Model 400H or Oscilloscope, vertical sensitivity better than 0.1 mV/div.
4.3
OUTPUT VOLTAGE CALIBRATION
The output voltage calibration consists of the following calibration procedures which must all be
performed in sequence: Pre-calibration Setup (PAR 4.3.1), Zero Output Voltage (PAR 4.3.2),
Zero Voltage Monitor (PAR 4.3.3), Zero Current Monitor (PAR 4.3.4), Local Full Scale (FS) Out-
put Voltage (PAR 4.3.5), Remote Full Scale (FS) Output Voltage (PAR 4.3.6) and Full Scale (FS)
Voltage Monitor (PAR 4.3.7).
4.3.1
VOLTAGE PRE-CALIBRATION SETUP
Turn the power supply off and verify the following:
1.
At the rear panel links between terminals 1 and 2, terminals 3 and 4, terminals 5, 6 and 7
and terminals 8 and 9 on TB501 are installed and securely tightened
2.
Turn front panel I
lim
control to the full clockwise position.
3.
Turn front panel VOLTAGE control to the full counterclockwise position.
4.
Turn the OVP adjustment (see Figure 2-3) to full clockwise position.
5.
Verify that no load is connected to the output.
