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2.3.3.2.AUTO Mode Indicator
2.4
Rear Panel
The rear panel of the Model 406D is shown in Figure 2.4-1 and contains
all the input and output connections for the system. Starting with Serial
#877 a universal switching power supplies that operates from 90-
260VAC, 50/60Hz is used. It is not necessary to change the voltage
settings or fuse in the Power module. These units incorporate
resettable fuses. To reset turn off unit for at least 20 seconds, then
turn back on. If the system still does not operate contact ETS at 215-
887-2196 for service.
2.4.1 Voltage Select Module (NOTE: For Serial# 876 and all prior units)
All instruments with Serial #876 or below were equipped with a LINE
VOLTAGE SELECT module that enables the user to select the correct
line voltage. These voltages are 100, 120, 220 and 240 VAC, 50/60Hz.
The line voltage is normally preset at the factory. When set to 220-
240VAC a "220 VOLT" label is prominently displayed on the unit.
However, if the Model 406D line voltage (Mains) must be changed by the
user, follow the procedure below:
The line cord supplied utilizes the standard IEC international appliance
connector that enables the user to locally obtain a cord set with the
correct power line plug. Before plugging the unit in, check to see that the
correct line voltage has been set.
Before attempting to change voltage settings, disconnect the power cord.
For 100 and 120 Volt operation a 3/4 Amp, 250 VAC, 3AG Slo Blo fuse is
used. Remove the cover of the POWER/FUSE unit using a small blade
This single digit LED display indicates the number of test cycles (1-
9) that have been completed and is only illuminated in the AUTO
mode. It is advanced by one count each time the unit goes into the
TEST state automatically. When the AUTO mode indicator
displays the same number as set on the TESTS selector, the unit
will have completed the test run and will then go to, and stay in, the
TEST OVER state. It is reset to zero when either the ZERO/STBY
or CHG button is depressed. It is also set to zero when the AUTO
button is depressed or the power is initially turned on.
Figure 2.4-1: Rear Panel (Ser# 877 forward)
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