Tektronix LumaColor II J18, Instruction Manual

Page: 23 / 114

Power Options
J18 Photometer Instruction Manual 1–5
Using the Optional AC Power Adapter
The J18 may be powered with the optional external AC power
adapter. The power adapter will override the internal battery if one
is installed. To ensure accurate measurements, cycle the photometer
power off and then on again to permit the photometer to autozero
using the new power source.
Plug the pin connector of the adapter into the EXT. POWER
connector on the side of the J18 (see Figure 1–3). Plug the power
adapter into a 120 VAC AC power outlet. (A 220 VAC adapter is
also available.)
ANALOG
OUTPUT RS232D
+
S
Figure 1–3: Location of J18 Power Adapter Connector
CAUTION. Be sure that any power supply you use with the J18
provides power within the range of 9 to 16 VDC. Also, the center
contact polarity of the adapter is positive (+). A power supply that
does not meet these requirements may damage the J18.
The backlight will be lit at power-on when the J18 is powered by the
AC power adapter. The backlight may be turned off, if desired, by
pressing the BACKLIGHT button.
NOTE . AC power adapters that provide less than 12 volts may not
automatically turn on the backlight.
Power Options
J18 Photometer Instruction Manual 1–5
Using the Optional AC Power Adapter
The J18 may be powered with the optional external AC power
adapter. The power adapter will override the internal battery if one
is installed. To ensure accurate measurements, cycle the photometer
power off and then on again to permit the photometer to autozero
using the new power source.
Plug the pin connector of the adapter into the EXT. POWER
connector on the side of the J18 (see Figure 1–3). Plug the power
adapter into a 120 VAC AC power outlet. (A 220 VAC adapter is
also available.)
ANALOG
OUTPUT RS232D
+
S
Figure 1–3: Location of J18 Power Adapter Connector
CAUTION. Be sure that any power supply you use with the J18
provides power within the range of 9 to 16 VDC. Also, the center
contact polarity of the adapter is positive (+). A power supply that
does not meet these requirements may damage the J18.
The backlight will be lit at power-on when the J18 is powered by the
AC power adapter. The backlight may be turned off, if desired, by
pressing the BACKLIGHT button.
NOTE . AC power adapters that provide less than 12 volts may not
automatically turn on the backlight.