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Fig.1.6
Type 4297 Calibration
Chart
1.2.3
Use of Power Supply
An external DC power supply can be used. It is not necessary to remove the internal batteries.
The power supply is connected using the 5.5 mm diameter socket at the rear of the unit marked
12 V as shown in Fig.1.7. A smoothed and regulated supply of 10 – 14 V with 100 mV maximum
ripple is required. Ensure that the correct polarity is used – positive to the 2 mm centre pin.
The following Brüel & Kjær power supplies are recommended:
•
ZG 0386 EU Power Supply
•
ZG 0387 UK Power Supply
•
ZG 0388 US Power Supply
Fig.1.7
Rear view of
Type 4297. The
external power supply
input socket marked
12 V is shown on the
left. The external
generator signal is
applied to the LEMO
socket shown on the
right
Battery Replacement
Two type LR6 1.5 V alkaline batteries (part number QB-0013) are used to power the unit. The
batteries must be replaced if neither of the two small red LED indictors fail to light when the start
button is pressed. If the instrument is activated, there is an automatic 'power-off' function if the
battery level falls below that needed for correct operation of the calibrator.
CHAPTER 1
Introduction and Description
7
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