Heathkit IM-4100 - Page 75

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OVERRANGE indicator: Indicates when GATE lamp (D106): Flashes off and beck
the number to be displayed is larger than
the digplay can handle on when the display is updated.
RESET switch (SW5): Resets the display
to zero in any mode.
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GATE
COUNTER F
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INPUT ATTEN switch (SW4): Divides the
POWER/TIME BASE switch (SW2): Turns
the unit on and off, selects between kHz amplitude of the incoming signal by 1, 10,
or 100.
and MHz in the FREQ MODE, and selects
between SEC and mS in the PER (period)
MODE.
MODE switch (SW3): Selects the
operating mode of the Counter — PER
(period), FREQ (frequency), or TOL
(totalize). TOL is an events count mode
and can be gated by using the rear panel
INPUT/OUTPUT jack and putting the
EXT/INT switch in the EXT position.
INPUT/OUTPUT connectors: Use as an
input for an external time base signal, or
as an output for the internal time base
signal. You can also apply an inhibit signal
to gate the totalize mode.
EXT PWR connector: Accepts external
DC power connector.
cm INPUT /
EIA-416
+95
AMPS
OUTPUT
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120/240VAC 50/60Hz EXT PWR IG
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WATTS
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CAUTION: ae
DISCONNECT
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BEFORE OPENING.
OSCILLATOR
OSCILLATOR EXT INT switch: Selects
either the internal time base or an external
time base signal.
OSC ADJ capacitor (C7): Calibrates the
time base frequency.
Figure 6