BK Precision 2120C, Instruction Manual, Page: 23 / 30

CALIBRATION CHECK
A general check of calibration accuracy may be made by
displaying the output of the CAL terminal on the screen.
This terminal provides a square wave of 2 V p-p. This signal
should produce a displayed waveform amplitude of four
divisions at .5 V/div sensitivity for both channel 1 and 2
(with probes set for direct). With probes set for X10, there
should be four divisions amplitude at 50 mV/div sensitivity.
The
VARIABLE controls must be set to CAL during this
check.
NOTE
The CAL signal should be used only as a
general check of calibration accuracy, not
as a signal source for performing recali-
bration adjustments; a voltage standard
calibrated at several steps and of 0.3% or
better accuracy is required for calibration
adjustments.
The CAL signal should not be used as a
time base standard.
INSTRUMENT REPAIR SERVICE
Because of the specialized skills and test equipment re-
quired for instrument repair and calibration, many custom-
ers prefer to rely upon
B+K Precision for this service. To
use this service, even if the oscilloscope is no longer under
warranty, follow the instructions given in the SERVICE
INFORMATION portion of this manual. There is a flat rate
charge for instruments out of warranty.
MAINTENANCE
21
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