Digital Multimeter Displays; Oscilloscope Displays - Tektronix 213 DMM Instruction Manual

Operating lnstructions-213 Service
best spot definition (the dot will be slowly sweeping across
the screen from left to right).
3. Set the SEC/DIV control to .5 m and adjust the vertical
POS ~ontrol so the trace coincides with the center horizon-
tal graticule line. If the trace is not parallel with this line,
set the TRACE ROTATE adjustment (screwdriver adjust-
ment on the side panel) for coincidence.
4. Depress the DMM pushbutton. Alternately switch the
VOL TS-mA/DIV control between the 0.1 and 1 volt ranges
(blue scale) and check for the same count (approx 0000)
and polarity sign in both positions. If they are not the same,
set the DC BAL adjustment (screwdriver adjustment on the
side panel) for the same count and polarity sign.
Digital Multimeter Displays
VOLTAGE MEASUREMENT DISPLAY. Perform the follow-
ing procedure to obtain a voltage measurement display:
1. Perform the Operators Adjustments steps.
2. Set the INPUT COUPLING switch to DC, select a VOL TS-
mA/DIV range (blue scale) compatible with the amplitude
of the de voltage source to be measured, and connect the de
voltage source between the probe tip and the probe common
clip. The display represents the value of the de voltage source.
3. Reverse the probe tip and common clip connections and
note that the numerical reading remains approximately the
same but the opposite polarity sign is displayed. Disconnect
the de source.
4. Depress the RMS pushbutton, set the INPUT COUP-
LING switch to AC, select a VOL TS-mA/DIV range (blue
scale) compatible with the amplitude of the ac voltage source
to be measured, and connect the ac voltage source between
the probe tip and probe common clip. The display repre-
sents the value of the ac voltage source. Set the RMS push-
button to the out position and note that the average de value
of the ac signal is zero verifying that the ac filter is opera-
tional. Disconnect the ac signal.
CURRENT MEASUREMENT DISPLAY. Perform the fol
-
lowing procedure to obtain a current measurement display:
5. Depress the mA pushbutton, set the RMS pushbutton to
the out position, and select a VOL TS-mA/DIV range (blue
scale) compatible with the amplitude of the current genera-
ted by the de voltage source in series with the current limit-
ing resistor. Connect the de voltage source in series with the
current limiting resistor, and connect this combination be-
tween the mA-Q jack and the COMMON jack with test
leads. The display represents the value of the de current.
Disconnect the de source and resistor.
2-6
6. Depress the RMS pushbutton and select a VOL TS -mA/
DIV range (blue scale) compatible with the amplitude of
the current generated by the ac voltage source and a series
current limiting resistor. Connect the ac voltage source in
series with the current limiting resistor, and connect this
combination between the mA-Q jack and the COMMON
jack with test leads. The display rep resents the value of
the ac current. Disconnect the ac source and resistor.
RESISTANCE MEASUREMENT DISPLAY. Perform the
following procedure to obtain a resistance measurement
display:
7. Depress then pushbutton and set the RMS pushbutton
to the out position. Select a VOL TS-mA/DIV range com-
patible with the value of the resistor to be measured and
connect the resistor between the mA-Q jack and COMMON
jack with test leads. The display represents the value of the
resistor.
OVERRANGE DISPLAY. Perform the following proce-
dure to obtain an overrange display:
8. Disconnect the resistor and the display shows an over-
range condition.
Oscilloscope Displays
NORMAL SWEEP DISPLAY. Perform the following pro-
cedure to obtain a normal sweep display:
1. Perform the OPERATORS ADJUSTMENTS steps.
2. Set the DMM pushbutton to the out position and INPUT
COUPLING switch to AC. Select a VOL TS-mA/DIV range
(black scale) compatible with the amplitude of the ac vol-
tage source to be applied and connect the ac voltage source
between the probe tip and probe common clip. Select a
SEC/DIV range for the desired display and adjust the LEVEL-
SLOPE control for a stable display.
3. Rotate the VOL TS-mA/DIV VAR control counterclock-
wise out of its calibrated detent and observe the reduction
in the vertical size of the display. Return the control to the
CAL detent.
4. Set TRIGGER switch to INTL AC NORM and rotate
the LEVEL-SLOPE control to obtain a stable display at
some position on both slopes of the control. Reset the
TRIGGER switch to INTL AC AUTO.
MAGNIFIED SWEEP DISPLAY. Perform the following
procedure to obtain a magnified sweep display:
5. Adjust the horizontal POS control to move the display
to be magnified to the center portion of the crt. Turn the
HORIZ MGF VAR control clockwise out of its calibrated
detent and adjust the display for the desired amount of
magnification. Return the control to its CAL detent. Dis-
connect the ac source.
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