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Operating Instructions-DC 501 0
measurement is always displayed in a right-hand justified
SLOPE
-,+.
When unlighted, selects
+;
when lighted,
format with the decimal point automatically positioned. Dis-
selects
-.
This button selects the slope of the signal at the
/ -
played count overflow is indicated by a flashing display. In
trigger level crossing, which is recognized a ! ; a countable
measurements such as Time A--6, where the number of
event. CHANNEL A slope also selects between risetime (+
resolved digits increases more slowly with an increase in
Slope) and fall time (- Slope); it must be set before the
averaging, only correct (resolvable) digits are displayed.
RISEIFALL A button is pushed.
Five of the annunciators are used to indicate the units of
COUPL-AC, DC. When unlighted selects DC; when
measurements: HzISEC for Hertz or seconds, kHz/mSEC
lighted selects AC. DC is direct coupled. AC inserts a ca-
for kilohertz or milliseconds, MHzlPSEC for megahertz or
pacitor in series with the input which allows small signals
microseconds, GHzlnSEC for gigahertz or nanoseconds,
with large dc offsets to be measured.
and VOLTSIAVGS for (trigger level) Volts, and (the expo-
nent of) the number of Averages.
FRONT PANEL CONNECTORS
The GATE annunciator, when illuminated, indicates that
the counter is in the process of accumulating counts for the
@
CHANNEL A
-
CHANNEL B (Identical in
measurement.
performance)
The REMOTE annunciator indicates the instrument is in
1 MQ 23 pF/50
Q.
Signal input connectors.
a remotely-programmed state, when illuminated. The AD-
Vpk
+
2 V max (50 Q )
DRESS light indicates that the instrument is actually being
Vpk
+
42 V max (1 MQ)
addressed over the GPlB bus.
@
CH A, SHAPED OUT
-
CH B, SHAPED OUT
In addition to displaying the measurement results, the
(Shaped Out A/B/COM)
counter uses the extreme left three digits of the seven-seg-
These outputs provide an exact replica of the internal
merit
LED
to indicate internal
Or
'perating
error
signal that is being measured. It is an aid to proper trigger-
?
codes. The two digits (extreme left-digit Channel A and the
ing
complex waveforms. The outputs provide a
mV
extreme right-digit Channel
B,
On
the
report the re-
signal near ground from 50
Q
(200 mV unterminated). These
sults of compensating external signal probes. See Self Test
are
full bandwidth outputs, and function well beyond
Display and Probe Compensation.
350 MHz.
In addition, many of the front-panel pushbuttons are
illuminated.
@
ARM, IN
-
Vpk
<
10 V (Arming TTL)
This input (normally high) allows the counter to measure
only when in the high state. When in the low state, this input
prevents the counter from measuring. (Alternatively, this in-
put may be provided through the rear interface.)
FRONT PANEL CONTROLS
@
TERM, SLOPE, ATTEN, and COMPL
(CHANNEL A and CHANNEL B)
@
PROBE COMP
This test point provides a rectangular waveform
( ~ 5
volts) that can be used in conjunction with the "PROBE
TERM-50 0, 1 MO (termination). When unlighted, se-
COMP" function to compensate test probes (see Probe
lects 1 MQ, 23 pF; when lighted, selects 50
Q.
Allows user to
Compensation in this section.)
properly terminate 50
Q
inputs when required. (Unit will
automatically revert to 1 MQ, 23 pF in the event of an
overload.)
FRONT PANEL PUSH BUTTONS
ATTEN-XI,
X5. When unlighted, selects X5; when
lighted, selects XI. Allows the signal to be applied directly to
the amplifier without attenuation or attenuated by a factor of
@
Function Pushbuttons
n
five. The attenuator effectively increases the input hyster-
FREQ A (Frequency A). Measures the period of the
esis and trigger level range by a factor of five.
Channel A signal, calculates and then displays frequency.
2-4
REV JUL
1983
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