B+K precision 2712 Manual

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BK 2712 CALIBRATION PROCEDURE
Before removing the BK 2712 from service check that the necessary calibration requirement, listed
below, is available.
FLUKE 5500AAUTOCAL MULTIFUNCTION CALIBRATOR
Perform calibration at 23°C ± 2°C and at relative humidity < 70%. Allow the meter to stabilize at
this temperature for at least 30 minutes prior to performing the calibration procedure.
CALIBRATION:
Step 1: Set the function switch to OFF position. Remove the case bottom. Set the 3-pin short circuit
connector, mounted on upper left side of PC board, from J2 to J1 position. Replace the case
bottom of the meter.
Step 2: Press MAX/MIN button while turning on the meter from OFF to any position. Release the
MAX/MIN button when the LCD displays normally.
Step 3: Set the function switch to DC mA range forAuto Zero Adjustment. Press HOLD button
once, and a beep sound is audible indicating that the setting is saved. The HOLD symbol
appears in the display. Wait for about 5 seconds, and press HOLD button again. The
HOLD symbol in the display disappears, and Zero Adjustment begins. Wait for about 5
seconds until the reading in the display descends to less than 10 counts. Zero Adjustment is
completed.
Step 4: DCV Auto Adjustment
Set the function switch to DCV range. Press RANGE button to select the 400mV range.
a. On 400mV range: Apply DC +389.80mV to the meter. Press HOLD button to save the
setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed. Press RANGE button to select the next range.
b. On 4V range: Apply DC +3.9000V to the meter. Press HOLD button to save the setting
(a beep sound is audible). The HOLD symbol appears in the display. Press HOLD button
again to delete the HOLD symbol in the display, and adjustment is completed. Press
RANGE button to select the next range.
c. On 40V range: Apply DC +39.000V to the meter. Press HOLD button to save the setting

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(a beep sound is audible). The HOLD symbol appears on the display. Press HOLD
button again to delete the HOLD symbol in the display, and adjustment is completed.
Press RANGE button to select the next range.
d. On 400V range: Apply DC +390.00V to the meter. Press HOLD button to save the
setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed. Press RANGE button to select the next range.
e. On 1000V range: Apply DC +600.0V to the meter. Press HOLD button to save the
setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed.
f. After above 5 steps are completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and the DCV auto calibration is completed.
Step 5: ACV Auto Adjustment
Set the function switch to ACV range. Press RANGE button to select the 4V range.
a. On 4V range: ApplyAC +3.9150V/50Hz to the meter. Press HOLD button to save the
setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed.
b. After above step is completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and theACV auto calibration is completed.
Step 6: ACV+DCV ( ) Auto Adjustment
Set the function switch to DCV range. Press ACV+DCV ( ) button to select the
ACV+DCV function. Press RANGE button to select 1000V range.
a. On 1000V range: Apply DC 0mV to the meter. After 30 seconds when the LCD is
settled, press HOLD button to save the setting (a beep sound is audible), and the HOLD
symbol appears in the display. Press HOLD button again, and the HOLD symbol in the
display disappears. Zero adjustment is completed. Press RANGE button to select 4V
range.
b. On 4V range: Apply DC +3.9000V to the meter. Press HOLD button to save the setting
(a beep sound is audible), and the HOLD symbol appears in the display. Press HOLD
button again, and the HOLD symbol in the display will disappear.
c. After above 2 steps are completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and theACV+DCV ( ) auto calibration is completed.
Step 7: DC 400mAand AC 40mAAuto Adjustment
Set the function switch to DC/AC mA range. Press DCA/ACA button to select DCA
function, and press RANGE button to select 400mA range.

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a. On DC 400mA range: Apply DC +389.50mA to the meter. Press HOLD button to save
the setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed. Press DCA/ACA button to select ACA function, and press RANGE button
to select 40mA range..
b. On AC 40mA range: Apply 39.100mA/50Hz to the meter. Press HOLD button to save
the setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed.
c. After above 2 steps are completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and the DC 400mAand AC 40mA auto calibration is completed.
Step 8: DC 10AAuto Adjustment
Set the function switch to DC 10A range.
a. On DC 10Arange: Apply DC +1.999Ato the meter. Press HOLD button to save the
setting (a beep sound is audible). The HOLD symbol appears in the display. Press
HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed.
b. After above step is completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and the DC 10Arange auto calibration is completed.
Step 9: Ohm (Ω) Auto Adjustment
Set the function switch to OHM (Ω) range. Press RANGE button to select 40KΩ range.
a. On 40KΩrange: Apply 20.000KΩto the meter. Press HOLD button to save the setting
(a beep sound is audible). The HOLD symbol appears in the display. Press HOLD button
again to delete the HOLD symbol in the display, and adjustment is completed.
b. After above step is completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and the Ohm (Ω) range auto calibration is completed.
Step 10: Capacitance Auto Adjustment
Set the function switch to Capacitance range. Press RANGE button to select the 40nF range.
a. On 40nF range: Insert a standard 20.00nF capacitor to the meter. Press HOLD button to
save the setting (a beep sound is audible). The HOLD symbol appears in the display.
Press HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed. Press RANGE button to select 400nF range.
b. On 400nF range: Insert a standard 200.0nF capacitor to the meter. Press HOLD button to
save the setting (a beep sound is audible). The HOLD symbol appears in the display.
Press HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed. Press RANGE button to select 40µF range.
c. On 40µF range: Insert a standard 20.00µF capacitor to the meter. Press HOLD button to

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save the setting (a beep sound is audible). The HOLD symbol appears in the display.
Press HOLD button again to delete the HOLD symbol in the display, and adjustment is
completed.
d. After above 3 steps are completed, press BACKLIGHT button to save the setting (a beep
sound is audible), and the Capacitance auto calibration is completed.
Step 11: Calibration on all functions has been completed. Set the Function Switch back to OFF.
Remove the case bottom. Set the 3-pin short circuit connector on PC board from J1 to J2
position. Replace the case bottom.