General Information - Tektronix 5A14N Instruction Manual

Operating Instructions—5A14N
To install, align the upper and lower rails of the 5A14N
with the plug-in compartment tracks and fully insert it (the
plug-in panel must be flush with the oscilloscope panel). To
remove, pull the release latch to disengage the 5A14N from
the oscilloscope.
The first few steps of the following procedure are
intended to quickly obtain a trace on the screen and
prepare the instrument for immediate use. The remainder
of the steps demonstrate some of the basic functions of the
5A14N, Operation of other instruments in the system is
described in the instruction manuals for those units.
1. Insert the unit all the way into the oscilloscope
system plug-in compartment.
8. To demonstrate AC-coupled operation, position
(with the POSITION control) the bottom of the display to
f*
the graticule centerline. V
9. Push in the AC button and note that the display
shifts downward to its average level.
Step Attenuator Balance (Each Channel)
If the internal control is not properly adjusted, the CRT
zero reference point (trace or spot) will shift vertically due
to differential DC imbalance in the amplifier as the
VOLTS/DIV switch is rotated throughout its range. The
shift is more noticeable on the most sensitive positions.
2. Turn the oscilloscope Intensity control fully counter¬
clockwise and turn the oscilloscope power on. Preset the
time-base and triggering controls for a 2-millisecond/
division sweep rate and automatic triggering.
a. With the instrument operating, ground the input
(GND button pushed in) and set the VOLTS/DIV switch to
5 V. Move the trace to the graticule center with the
POSITION control.
3. Set the 5A14N front-panel controls as follows:
CH 1 through CH 4
DISPLAY
POSITION
VOLTS/D IV
Input Coupling
ON (deflection factor
illuminated)
Midrange
.2 V (Calibrated)
DC, GND
4. Adjust the Intensity control for normal viewing of
the four traces.
b. Rotate the VOLTS/DIV switch throughout its range
and adjust the appropriate internal Step Atten Bal control
for minimum trace shift.
Gain Check (All Channels)
The vertical and horizontal deflection systems of the
5100-series oscilloscopes are gain-standardized to permit a
plug-in to be moved from one oscilloscope to another (or
from one compartment to another within the oscilloscope)
without the need to recheck the calibration each time.
However, the 5A14N gain can be checked and, if necessary,
adjusted.
5. Position the traces two divisions apart with the
POSITION controls.
6. Apply a 400-millivolt peak-to-peak signal (available at
the oscilloscope Calibrator loop) through a test lead or IX
probe to the CH 1 input connector.
7. Release the CH 1 GND pushbutton. The display
should be square waves approximately two divisions in
amplitude, with the bottom of the display at the reference
established in step 5. Adjust Trigger Level, if necessary, to
obtain a stable display. Rotate the CAL control throughout
its range, observing a reduction of the display amplitude.
Return the CAL control to the detent (calibrated Volts/
Div) position.
NOTE
The preceding procedure applies for each channel
,
However
,
the internal trigger signal for the time-base
plug-in is obtained from CH 1 only
.
This completes the basic operating procedure for the
5A14N. Instrument operations not explained here or those
that need further explanation are discussed under General
Information.
GENERAL INFORMATION
Applying Signals
When measuring DC voltage, use the largest deflection
factor (5 V/Div) when first connecting the 5A14N to an
unknown voltage source. If the deflection is too small to
make the measurement, switch to a lower deflection factor.
in general, probes offer the most convenient method of
connecting a signal to the input of the 5A14N. Tektronix
probes are shielded to prevent pickup of electrostatic
interference. A 10X attenuator probe offers a high input
impedance and allows the circuit under test to perform very
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