Operating Instructions—Type 422 AC-DC
Power Mode switch to the OPERATE 11.5 - 35V DC posi
tion. The DC power cord is supplied without an input con
nector. A suitable connector can be added to match the
power source, or the pigtail leads can be used as supplied.
Correct connections for the leads are as follows:
Green Earth (Ground)
White Negative DC
Black Positive DC
WARNING
If this instrument is operated without the green lead
of the DC power cord connected to earth (ground),
the chassis is floating with respect to earth. Operation
with the green lead disconnected is not recommended
due to the potential shock hazard produced if the
chassis becomes elevated with respect to earth.
The power input stage of the AC-DC Power Supply fea
tures a ground system which is isolated from chassis ground
for external DC operation in the OPERATE 11.5 - 35V DC
position. This feature allows the instrument to be operated
from DC voltages which are elevated up to 200 volts maxi
mum from chassis ground. Be sure the chassis remains con
nected to earth (ground) with the green lead of the DC
power cord for safety reasons.
When operated from an external DC source, stable oper
ation is provided over an input voltage range of 11.5 to 35
volts DC. Stable operation is provided with external DC
source voltage variations as long as the minimum instanta
neous DC voltage level does not go below 11.5 volts DC.
The internal battery charger circuit is inoperative for DC op
eration.
Battery Operation
Battery-Pack Installation. This instrument can be opera
ted from the internal batteries for completely portable op
eration through the use of the battery pack. Order the bat
tery pack from your local Tektronix Field Engineer or rep
resentative by Tektronix Part No. 016-0066-02. Use the
following procedure to install the battery pack:
1. For easy removal of the power supply, position the
instrument as shown in Fig. 2-4A.
2. Loosen and remove the four securing screws located
in the rear feet of the power supply (see Fig. 2-4B).
3. Separate the AC-DC Power Supply from the indicator
by sliding the power supply to the rear, off the support
rods.
4. Loosen and remove the battery box attaching screw
located below the fuse holders (see Fig. 2-4B).
5. Remove the battery box from the power supply.
6. Remove the four short bolts located in the battery-
pack securing holes (see Fig. 2-4B).
NOTE
The bolts removed in step 6 allow the Type 422 with
AC-DC Power Supply to meet the EMI specifications
given in Section 1 when the battery pack is not instal
led. These bolts are replaced with the screws to be
removed from the battery pack in step 8. If the in
strument is operated without the battery pack, re
place the bolts for minimum EMI radiation.
7. Lay the battery pack on a flat, non-conducting sur
face so it is resting on the interconnecting banana jacks and
the spring bracket. The cutout in the battery pack should
be positioned on the right side as shown in Fig. 2-4C.
8. Loosen and remove the four screws from the battery
pack (located near each corner; see Fig. 2-4C).
9. Slide the battery box over the battery pack (see Fig.
2-4D). The switch, connector and fuse holes in the battery
box should be located directly above the cutout in the
battery pack.
10. Install the four battery-pack screws removed from
the battery pack in step 8 into the battery-pack securing
holes located near the rear feet. Fig. 2-4B shows the lo
cation of these screws. Tighten the screws evenly and se
curely.
11. Install the complete battery box/battery pack as
sembly onto the rear of the power supply so the switch,
connector and fuses fit through the cutouts in the battery
pack and battery box (see Fig. 2-4E). Also guide the inter
connecting banana jacks so they mate with the banana
plugs on the power supply.
12. Replace the battery-box attaching screw removed in
step 4.
CAUTION
This screw is designed to hold the battery box and
power supply together during assembly. The securing
screws to be installed in step 14 hold the complete
power supply assembly to the indicator to produce a
rugged instrument. When handling the AC-DC Power
Supply when it is not installed on the instrument, be
careful to avoid placing too much strain on the switch
bracket by the weight of the battery pack.
13. Slide the power supply onto the four support rods
of the indicator (see Fig. 2-4F). The CRT of the indicator
must fit into the cutout in the AC-DC Power Supply.
14. Replace the four securing screws located in the feet
of the power supply. Tighten these screws evenly and se
curely.
15. Before operating the instrument from the batteries,
charge the batteries for at least 16 hours. Complete
charging information is given under Battery Charging.
2-3
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