Tek-Trol Tek-LCD 7802A, Instruction Manual, Page: 16 / 43

4 Setup and Programming
4.1 Overview
Setup and programming are done through the infrared through-window buttons or using the
mechanical buttons when uncovered. There are two slide switches located on the connector board.
One is used to select backlight power (if equipped) and the other is to lock or unlock the through-
window buttons.
4.2 Through-Window Buttons
The Tek-LCD 7802A is equipped with four sensors that operate as through-window buttons so that it
can be programmed and operated without removing the cover. These buttons can be disabled for
security by selecting the LOCK setting on the switch located on the connector board in the base of
the enclosure. To actuate a button, press one finger to the window directly over the marked button
area. When the cover is removed, the four mechanical buttons located next to the sensors are used.
The sensors are disabled when a mechanical button is pressed and will automatically be re-enabled
after 60 seconds of inactivity.
The through-window buttons are designed to filter normal levels of ambient interference and to
protect against false triggering, however, it is recommended that the through-window buttons be
disabled (slide switch to LOCK) if there is an infrared interference source in line-of-sight to the
display.
Through-Window Button Tips:
•
To remove cover with power applied (safe area only), or to clean the window, select SERVICE in
the main menu before opening the cover. This will temporarily disable the through-window
buttons for 60 seconds to prevent inadvertent use. Use the mechanical buttons while the meter
is open.
•
To the extent possible, install the display facing away from sunlight, windows, reflective objects
and any sources of infrared interference.
•
Keep the window clean.
•
Tighten the cover securely.
•
Use a password to prevent tampering.
After all connections have been completed and verified, apply power to the loop.
There is no need to recalibrate the meter for milliamps when first received from the
factory.
The meter is factory calibrated for milliamps prior to shipment. The calibration
equipment is certified to NIST standards.