Front Panel - Tektronix 213 DMM Instruction Manual

Operating lnstructions-213 Service
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2-2
TRIGGER-This section contains the trigger mode
and level-slope controls.
EXT DC: Selects de coupled external trigger.
INTL AC NORM: Selects internal ac coupled trig-
ger signal. There is no trace when the vertical input
signal is not sufficient to cause triggering.
INTL AC AUTO: Same as INTL AC NORM ex-
cept the sweep free-runs and provides a bright
reference trace when the vertical signal.
LEVEL-SLOPE: Selects the amplitude point and
slope of the trigger signal on which the sweep is
triggered. When the control indicator dot is to the
left of center, the sweep is triggered on the positive-
going waveform. When to the right of center, the
sweep is triggered on the negative-going slope of
the trigger signal as shown by the negative-going
waveform.
HORIZ MGF VAR-Provides continuously variable
uncalibrated sweep magnification to at least 5 times
the sweep rate indicated by the SEC/DIV control.
The calibrated detent is at the fully counterclockwise
position.
TRACE ROTATE-Screwdriver adjustment to align
trace with the horizontal graticule line.
SWP CAL-Screwdriver adjustment to set the calibra-
ted sweep timing of the SEC/DIV control when the
HOR IZ MG F VAR control is in the calibrated detent.
POS (Horizontal Arrow Line)-Controls the horizon-
tal position of the oscilloscope display.
POWER-Turns instrument on and off. When the in-
strument is connected to the power line, charging
power is provided to the batteries in either position
of the switch.
INPUT COUPLING-Selects method for coupling of
input signal from voltage probe into input amplifier.
AC: Signal is capacitively coupled and the de com-
ponent is blocked.
GND: Connects the input amplifier to common to
provide a zero reference voltage without physically
disconnecting the probe from the circuit under test.
Connects the input signal to the ac coupling capa-
citor through a 10 Mn resistor which provides pre-
charging.
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DC: All components of the input signal are passed
to the input amplifier.
INTENSITY-Controls brightness of crt display.
FOCUS-Screwdriver adjustment to provide optimum
display definition.
VOL TS-mA/DIV VAR-Provides continuously varia-
ble uncalibrated deflection factors to at least 2.5
times the calibrated settings of the VOL TS-mA/DIV
control. The calibrated detent is at the fully clock-
wise position.
VERT GAIN-Screwdriver adjustment to set the cali-
bration of the VOL TS-mA/DIV control when the
VOL TS-mA/DIV control is in the calibrated detent.
POS (Vertical Arrow Line)-Controls the vertical posi-
tion of the oscilloscope display.
Front Panel
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VOL TS-Selects voltage mode for either digital multi-
meter or oscilloscope function.
RMS (OUT: DC)-DMM only. Selects true rms cir-
cuitry (button in) or ac rejection filter (button out).
Button must be in out position when measuring resis-
tance or the reading accuracy will be degraded.
DMM (OUT:SCOPE)-Selects digital multimeter func-
tion (button in) or oscilloscope function (button out).
1481-36
Fig. 2-2. Front panel.
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