Operating Instructions—Type 422 AC-DC
power mode. Table 2-1 describes the operation in each posi
tion of the Power Mode switch.
TABLE 2-1
Power Mode Switch Functions
Switch Position
Function
CHARGE BATT 230V AC
Used when AC line voltage
applied to instrument is 230
volts nominal. Charges inter
nal battery pack at a 400
milliampere rate when
POWER switch is on. Indica
tor does not operate in this
switch position.
230V AC
Provides instrument opera
tion from a 230-volt nominal
AC line voltage source. In
dicator operable and a 30
milliampere trickle charge is
applied to battery pack.
11.5-35V DC
Provides instrument opera
tion from an external DC
source. Indicator operable
but no charging is provided
for battery pack.
INT BATT Provides instrument opera
tion from an internal battery
pack. Indicator operable but
battery pack cannot be
charged in this switch posi
tion.
115V AC
Provides instrument opera
tion from a 115-volt nominal
AC line voltage source. In
dicator operable and a 30
milliampere trickle charge is
applied to battery pack.
CHARGE BATT 115V AC
Used when AC line voltage
applied to instrument is 115
volts nominal. Charges inter
nal battery pack at a 400
milliampere rate when
POWER switch is on. Indica
tor does not operate in this
switch position.
CAUTION
Turn the POWER switch off (pushed in) before oper
ating the Power Mode switch.
AC Operation
The Type 422 with AC-DC Power Supply can be opera
ted from either a 115-volt or a 230-volt (nominal) AC line
voltage source. The Power Mode switch on the rear of the
power supply converts the instrument from one operating
range to the other and also selects the other power modes
(see Table 2-1 for description of the Power Mode switch).
In the OPERATE 115V AC position of the Power Mode
switch, this instrument provides stable operation over a line
voltage range of 95 to 137 volts (without batteries). When
in the OPERATE 230V AC position, stable operation is
provided with line voltage variations between 190 and 274
volts. Stable operation is also provided for line frequencies
between 45 and 440 hertz. However for line frequencies
below 50 hertz, derate the upper line voltage lim it linearly
to a maximum of 10%.at 45 hertz.
To convert this instrument from 115-volt to 230-volt
nominal AC operation, use the following procedure:
1. Disconnect the instrument from the power source.
2. Set the Power Mode switch for the desired line
voltage.
3. Change the line-cord power plug to match the power-
source receptacle or use a suitable adapter.
This instrument is designed to be used with a three wire
AC power system. If a three- to two-wire adapter is used to
connect this instrument to a two-wire AC power system, be
sure to connect the ground lead of the adapter to earth
(ground). Failure to complete the ground system may allow
the chassis to be elevated above ground potential and pose a
shock hazard.
For AC operation, connect the AC power cord to the
AC portion of the power receptacle (see Fig. 2-3). Select
the nominal operating voltage and the power mode with the
Power Mode switch. More information on operation in the
CHARGE BATT 230V AC and CHARGE BATT 115V AC
positions is given under Battery Operation in this section.
DC Operation
This instrument can be operated from an external DC
source by connecting the DC power cord to the DC portion
of the power receptacle (see Fig. 2-3) and by setting the
Fig. 2-3. Portion of power receptacle used for AC and external DC
operation.
2-2
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