Tektronix P6042 PROBE, Инструкция по эксплуатации

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Type P6042
SECTION 2
OPERATING INSTRUCTIONS
Change information, if any, affecting this section is found at the rear of the manual.
General
The P6042 Current Probe is designed to work into either a
50-ohm system or a high impedance oscilloscope using a
50-ohm termination.
This section of the manual describes the
use of the P6042 Current Probe. Information in this section
is given to aid in making accurate measurements with the
probe.
Handling
The P6042 is designed to be as rugged as possible,
consistent with good high-frequency response and size. How­
ever, as with all precision devices, the probe and cable
should be handled with care to avoid damage. Special care
should be taken that the cable not be crushed, kinked, or
pulled. Avoid dropping the probe, as some of the most sen­
sitive circuitry is located within the probe assembly.
Operating Voltage
The P6042 can be powered from either a 115-volt or a 230-
volt nominal line voltage source. The line voltage selector
assembly on
the rear panel converts the instrument from
one operating range to the other. In addition, this switch
assembly changes the primary connections of the power
transformer to allow selection of one of three regulating
ranges. The assembly also includes the two line fuses. When
the instrument is converted from 115-volt to 230-volt nominal
operation, or vice versa, the switch assembly connects or
disconnects one of the fuses to provide the correct protec­
tion for the instrument. Use the following procedure to con­
vert this instrument between nominal line voltages or reg­
ulating ranges.
1. Disconnect the instrument from the power source.
2. Loosen
the two captive screws which hold the cover
onto the switch assembly; then pull to remove the cover.
3. To convert from 115-volt to 230-volt operation, pull out
the Voltage Selector switch bar (see Fig. 2-1); turn it around
and plug into the remaining holes. Change the power cord
to match the powersource receptacle or use a 115-volt to
230-volt plug adapter.
4. To change regulating ranges, pull out the Range Selec­
tor switch bar (see Fig. 2-1); slide it to the desired position
and plug it back in. Select a range which is centered about
the average line voltage to which the instrument will be con­
nected (see Table 2-1).
5. Re-install the cover and tighten the two captive screws.
6. Before applying power to the instrument, check that the
indicating tabs on the switch bars are protruding through the
correct holes for the desired nominal line voltage and regulat­
ing range.
Fig. 2-1. Line Voltage Selector assembly on the rear panel (shown
with cover removed).
CAUTION
The P6042 should not be operated with the Volt­
age Selector and Range Selector switches in the
wrong position for the line voltage applied. Opera­
tion of the instrument with the switches in the
wrong positions will either provide incorrect opera­
tion or damage the instrument.
TABLE 2-1
Regulating Ranges
Range Selector
Switch Position
Regulating Range
115-Volts
Nominal
230-Volts
Nominal
LO (switch bar in left
holes)
90 to 110 volts 180 to 220 volts
M (switch bar in mid­
dle holes)
104 to 126 volts 208 to 252 volts
HI (switch bar in right
holes)
112 to 136 volts 224 to 272 volts
Operating Temperature
The P6042 depends upon convection cooling to maintain
a safe operating temperature. Adequate clearance on all
sides must be provided to allow heat to be dissipated away
from the instrument. Do not block or restrict the air flow
2-1