Tektronix 422, Instruction Manual

Page: 17 / 213

Operating Instructions—Type 422 AC-DC
Fig. 2-5. Securing the power cable to the power supply for remote
operation.
Press in here on feofh
sides o f the instrument to
position handle.
Fig. 2-6. Handle positioned to provide a stand for the instrument.
OPERATING TEM PERATURE
General
The Type 422 w ith AC-DC Power Supply requires very
little air circulation fo r proper operation. Thermal cutouts
in the indicator and the power supply provide thermal pro­
tection and disconnect the instrument power if the inter­
nal temperature exceeds a safe operating level. Power is
automatically restored when the temperature returns to a
safe level. The Type 422 w ith AC-DC Power Supply can be
operated where the ambient air temperature is between
—15°C and +55°C (+40°C maximum w ith battery pack
installed). This instrument can be stored in ambient temper­
atures between ~55°C and +75°C (—40°C to +60°C w ith
batteries). A fter storage at temperatures beyond the opera­
ting limits, allow the chassis to come w ithin the operating
limits before power is applied.
Operating Position
The handle of the Type 422 can be positioned fo r carry­
ing or as a tilt-stand fo r the instrument. To position the
handle, press in at both pivot points (see Fig. 2-6) and turn
the handle to the desired position. Several positions are
provided fo r convenient carrying or viewing. The instru­
ment can also be set on the rear-panel feet either fo r opera­
tion or storage.
CONTROLS A N D CONNECTORS
General
A brief description of the function and operation of the
controls and connectors of the Type 422 follows. Fig. 2-7
shows the fro n t panel o f this instrument More detailed
inform ation is given in this section under General Operating
Information.
Cathode-Ray Tube (CRT)
INTENSITY Controls brightness of display.
FOCUS Provides adjustment fo r optim um dis­
play definition.
ASTIGMATISM Used in conjunction w ith the FOCUS
control to obtain a well-defined dis-
play.
SCALE ILLU M Controls graticule illum ination.
Vertical (both channels if applicable)
VO LTS/D IV Selects vertical deflection factor in
1-2-5 sequence (VAR IA BLE control
must be in CAL position fo r indicated
deflection).
V A R IA B LE
UNCAL
POSITION
GAIN
Provides variable uncalibrated deflec­
tion factors between the calibrated set­
tings o f the VO LTS/D IV switch.
L ig h t in d ic a te s that V A R IA B LE
V O LTS/D IV control is not in the CAL
position.
Controls vertical position o f the trace.
Screwdriver adjustment to set gain of
the vertical input amplifier.
m
2-7