Instruction Manual

BHK-MG (OPR) (OPR) 022014 4-7
4.4.3 CALIBRATION PROCEDURE
1. Click on the Calibration Access button on the main panel (see Figure 4-2).This will open a
calibration panel (see Figure 4-3 and Table 4-1) that allows calibration in either voltage or
current mode. The Calibration Access button changes to Calibration Close.
2. The password has been set at the factory (see Table 4-2). Type the proper password in the
PASSWORD text box and press ENTER on the computer keyboard. If the password has
been forgotten, consult factory. If the password is correct, the VOLTAGE and CURRENT but-
tons will become active. Otherwise the message ERROR! - Wrong Password is displayed
and you must enter the correct password and press ENTER on the computer keyboard
again.
3. For Voltage Calibration, click VOLTAGE button. The text window reads Remove Shunt and
the message Connect DVM to Output is displayed above the SAVE CALIBRATION button.
4. Remove any connections between +OUT and –OUT. Connect DVM (high) to +OUT and
DVM (low) to –OUT, then click OK button.
NOTE: Use external DVM for all measurements.
5. The text window reads Volt Min Calibration and the message Measure and Adjust is
displayed beneath the text window. Using the " and # buttons (see PAR. 4.4.2), adjust the
output until the DVM is as close to 0 as possible but slightly positive, then click OK button.
TABLE 4-1. CALIBRATION PANEL FUNCTIONS
BUTTON OR WINDOW Function
Text box (at top) Used to enter unit password. Press ENTER on computer keyboard to vali-
date password.
VOLTAGE button Initiates Voltage calibration
VOLTAGE Indicator below VOLTAGE button Lights green when VOLTAGE calibration is acceptable. Lights red if VOLT-
AGE calibration needs to be done.
CURRENT button Initiates Current calibration
CURRENT Indicator below CURRENT button Lights green when CURRENT calibration is acceptable. Lights red if CUR-
RENT calibration needs to be done.
Message (as needed) below VOLTAGE and CUR-
RENT indicators
Provides instructions as needed about the calibration process.
White text window above OK button Displays the parameter currently being calibrated.
!– button Coarse Adjustment - Decreases the output value between five and 18 LSBs.
–
" button Coarse Adjustment - Increases the output value between five and 18 LSBs.
" button Fine Adjustment - Decreases the output value by one LSB.
# button Fine Adjustment - Increases the output value by one LSB.
OK button Enters the value displayed in the white text window
SAVE CALIBRATION Saves Calibration upon completion.
Message (as needed) above SAVE CALIBRATION
button
Provides instructions as needed about the calibration process.