Physical Features and Hook-up
Front Panel
Once the power, sensors, and outputs have been hooked-up, all user interactions (in stand-
alone mode) with the AFRecorder are made through the front panel. To enter or operate in
remote mode, the front panel is not used although the status of this mode is indicated on the
LCD displays.
The front panel holds two 4-line by 20-character format, backlit LCD displays. The contrast
(Models 4800R and 4800P) and intensity (Model 4800R only) of each display can be
adjusted via potentiometers accessible from the back of the instrument. The left display
reports the measurements of the left AFR sensor and the right display reports the
measurements of the right AFR sensor. Upon command (see Setup - Display - Size on page
17), the AFRecorder can enlarge the measurements of two parameters (i.e. two of: AFR_L,
AFR_R, DEV_L, DEV_R, L-R, AVG) so that they each fill a display. In addition to
displaying measurements, the displays can show the statistics of a recorded session or menu
information for AFRecorder set-up.
The keypad is labeled with numerics and three "hot keys" (SYS, REC, ENT). "SYS" stands
for SYSTEM and pressing it halts the current operation and brings the AFRecorder to the
main menu. "REC" stands for RECORD and pressing it while the AFRecorder is measuring
starts a recording session. "ENT" stands for ENTER and pressing it designates the
acceptance by the user of an entered selection. The "-" key serves both as a minus sign and
a backspace key for the cursor to delete an incorrect entry.
Rear Panel and Power Hook-up
The AFRecorder Model 4800R is powered by AC line power (100-240 VAC). The
AFRecorder Model 4800P can be powered by either AC line power (100-240 VAC) or by a
12 VDC battery. Do not operate the instrument with both the AC line power and DC power
attached at the same time.
AC power enters the AFRecorder through the AC line input module on the rear panel. The
input module integrates the power cord entry, the on-off switch, the AC line voltage
selection, and the AC line fuses into one assembly. The AC line input module must be
correctly programmed and fused for the AC voltage being fed into the instrument or damage
to the AFRecorder may result. There are two AC line voltage selections: 100-120 VAC and
220-240 VAC. To program the module for a different AC line input voltage or to change the
AC line fuses (2 fuses), open the module by putting a screwdriver in the slot on the top of the
module and carefully pulling the module door open. After the module’s door is open, pull
out the red fuse holder. The AC line voltage is programmed by putting the red fuse holder in
the module so that either “115V” (for 100-120 VAC) or “230” (220-240 VAC) on the fuse
holder is seen from the back of the AFRecorder when the AC line input module’s door is
closed. 2 A Slow Blow fuses are required for 100-120 VAC power and 1 A Slow Blow fuses
are required for 220-240 VAC power. All fuses must be rated for 250 VAC.
Features and Hookup 7
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