10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110
•
1-4
INSTRUMENT DESCRIPTION
and connectors are of a size and spacing such that the
instrument may be operated while wearing safety gloves.
Electrical: Power is from five rechargeable Ni-Cad C-cells,
rated at 3000 mA-hours each, series-connected. Nominal
voltage is 1.2 V each, totaling 6.0 V. Current drain varies
with range and back-lighting; but is approximately 20 mA
with no connection, providing approximately 140 hours of
operation when fully charged. To charge the battery, check
that the mains input module is set to the correct voltage,
plug the line cord into the front panel AC receptacle, with the
other end connected to a source of AC power. See Section
2.2. The battery will be charged (from a discharged
condition) in less than 8 hours; no damage will occur if
charged for a longer period. Charging power consumption
from nominal AC power line is less than 10 W average. This
instrument may be operated while connected to the AC line
without damage.
Front Panel Controls and Displays (See Figure 1)
MODE pushbutton
, is used to select 4-wire, 3-wire, or 2-wire
operation. When power is first turned on, the default is to 4-
wire operation. Successive operations of this pushbutton will
step the unit through 3-wire and 2-wire operation, then back
to 4-wire operation. Note that this is indicated on the display
by a 4, 3, or 2, at the left end of the display.
RANGE pushbutton
. Note that the R1L-D1 selects the proper
range automatically, but the RANGE pushbutton may be used
to step through all five ranges, plus auto-range, manually.
BACK-LIGHT pushbutton
. One operation turns the back-light
of the display on. A second operation turns the back-light off.
POWER pushbutton
(alternate action). One operation to turn
the power on, and a second operation to turn the power off.
Note that the display may be used as an indication that
power is on.
