KEPCO BIT 4886 Operator Manual - Manual (Page 28)

3-6
BIT 4886 120413
3.3.1 MANUAL CALIBRATION
1. Initiate calibration by sending the SCPI command
SYSTem:PASSword:CENable DEFAULT
and then send
CAL:STATe 1
. The password (DEFAULT) has been set at the factory. If the
password has been changed from DEFAULT, substitute the correct password for the unit in
the
SYST:PASS:CEN
command. If the password has been forgotten, consult factory.
If voltage calibration is not needed, proceed to step 16 for current calibration.
2. Set the BOP to zero volts output under the 1/4 range by sending
CAL:LVOLT ZERO
. Con-
nect a Digital Voltmeter (DVM) to the BOP output to measure the power supply output. Send
the Command
CAL:DPOT 32
to increase the output voltage until the DVM no longer
changes in response to the command. Then send the Command
CAL:DPOT -32
to the unit.
Adjust A1R81 on BOP until the DVM reads the voltage specified in Table 3-1 for LOW
RANGE ZERO.
3. Set the BOP output voltage to zero by sending
CAL:VOLT ZERO
. Send the command
CAL:DPOT 1
to increase the voltage or
CAL:DPOT -1
to decrease the voltage until the
DVM reads the voltage specified in Table 3-1 for VOLT ZERO.
4. Set the BOP to maximum positive output voltage by sending
CAL:VOLT MAX
. Measure the
voltage output using a DVM of at least 7 digits in accuracy.
5. Decrease the voltage output by sending
CAL:DPOT -1
commands until the voltmeter reads
less than the rated output voltage specified in Table 3-1 for MAX OUTPUT. Then send
CAL:DPOT 1
and verify the voltage is slightly above the rated output voltage specified in
Table 3-1 for MAX OUTPUT
6. Referring to Table 3-1 (HIGH RANGE ACCURACY) for value and ± tolerance, send the com-
mand
CAL:DATA -10
to decrease the voltage until the voltage is less than the rated output.
Send the command
CAL:DATA 1
to increase the voltage or the command
CAL:DATA -1
to
decrease the voltage until the DVM reads the value specified in Table 3-1 for HIGH RANGE
ACCURACY MAX.
7. Set the BOP to maximum negative output by sending
CAL:VOLT MIN
. Continue to measure
the output of the supply using the DVM.
8. If the output is less negative than the value specified in Table 3-1 for HIGH RANGE ACCU-
RACY MIN, send
CAL:DATA -100
and verify the output is now more negative. If the value
is still not more negative, send
CAL:DPOT -1
to change the course adjustment and provide
a more negative output.
Send the command
CAL:DATA 10
to increase the voltage. Continue to send
CAL:DATA 10
until the voltage is less negative than the value specified in Table 3-1 for HIGH RANGE
ACCURACY MIN. Send
CAL:DATA -1
until the reading is within the limits specified in Table
3-1 for HIGH RANGE ACCURACY MIN.
If the
CAL:DPOT
command was used to adjust the negative output, send
CAL:VOLT MAX
to
the unit and repeat step 6 before proceeding to step 9.
9. Set the BOP to 1/4 scale (low) range positive output voltage by sending
CAL:LVOLT MAX
.
Output voltage should be as specified in Table 3-1 for LOW RANGE NOMINAL. Measure the
voltage output using a Digital Voltmeter of at least 7 digits in accuracy.