KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 123)

BHK-MG (OPR) (OPR) 022014
4-9
16.The text window reads
Curr Max Calibration
and the message Measure and Adjust is
displayed beneath the text window. Using the coarse ! – and – " and fine " and # but-
tons (see PAR. 4.4.2), adjust the output until the DVM voltage reading corresponds as
closely as possible, but above, the rated maximum current, e.g., 0.04 Amperes (40mA) for
the BHK 500-0.4MG. Use I = E/R where E is the DVM reading (Volts), R is measured value
of the precision shunt resistor (Ohms) used to calculate I, the rated BHK-MG current in
Amperes. Click the OK button.
17.The unit automatically changes output current to approximately 1/10th the rated nominal cur-
rent. The text window reads
Enter Current reading
. The DVM measures the voltage
across the shunt. Calculate the output current using I (in Amperes) = E/R where E is the
DVM reading (Volts), R is measured value of the precision shunt resistor (Ohms). Enter the
calculated current value (in Amperes) in the field provided and click OK.
18.If the value is accepted, low range current calibration is complete and the indicator below the
Low Range CURRENT button on the calibration panel (Figure 4-3) lights green. If desired,
the low range current calibration can be repeated by clicking Low Range CURRENT button
at the calibration panel. If the value is not within the allowable range, the message window
displays either Entered Value is too small or Entered Value is too large. For example, the
value entered for the BHK 500-0.4MG should be around 0.004. Only values between 0.0044
and 0.0037 will be accepted. If the value entered is too small or too large, repeat measure-
ment and calculation of step 12, enter the correct value and click OK.
19.Click on the CALIBRATION SAVE button on the calibration panel (Figure 4-3) to save the
calibration entries and exit calibration. To return to the old calibration and exit without saving
the calibration just performed, click on the Calibration Close button on the main panel.
4.5 CHANGING THE CALIBRATION PASSWORD
The 4-digit password is required to enter calibration mode. The factory default passwords are
listed in Table 4-2.
1. With the power supply in command entry status
(:_:_:)
, press MENU key until the LCD
reads
Change Passw. OldPass(=_=_=)
.
2. Enter the old password and press ENTER. (To exit without changing the password, press
CLEAR.) Then enter the new 4-digit Password and press ENTER The password must have
four digits; the default passwords are 0500 for BHK 500-0.4MG, 1000 for BHK 1000-0.2MG
and 2000 for BHK 2000-.01MG.
3. The new password is accepted and the LCD shows the next MENU screen
GoTo Previ-
ous CALIB? 1(=_=_=)Yes
.
TABLE 4-2. FACTORY DEFAULT CALIBRATION PASSWORDS
MODEL PASSWORD
BHK 300-0.6MG 0300
BHK 500-0.4MG 0500
BHK 1000-0.2MG 1000
BHK 2000-0.1MG 2000