HP 1652B Getting Started Manual page 106

Signal Line
AIIY signal line you intend to probe with the logic analyzer probes, must
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SUPPly a
minimum of 600 mV to the probe tip. The probes have an
input impedance of 100 kst shunted by 8 pF. If the signal line is
incapable of this minimum voltage, you will not only have an incorrect
measurement, but the system under test may also malfunction.
Maximum
Probe Input
The maximum input voltage of each logic analyzer probe is 240 volts
Voltage
The maximum input voltage of the oscilloscope probes is 2250 volts dc
at 1 MQ setting and 5 volts rms at 50 S2 setting.
Pod Thresholds LO
gic analyzer pods have two preset thresholds and a user-defmable
pod threshold. The two preset thresholds are
ECL ( - 1.3
V) and TTL
-- ( +
1.6
V). The user-definable threshold can be set anywhere between
- 9.9 volts and + 9.9 volts in
0.1
volt increments.
The pod thresholds of pods
1
and 2 in the HP 1653B and of pods 1,2,
and 3 in the HP 1652B can be set independently. The pod thresholds of
pods 4 and 5 in the HP 1652B are slaved together. Therefore, when
you set the threshold on either pod 4 or 5, both thresholds will be the
same.
Connecting the
There are four ways you can connect the logic analyzer to your target
Logic Analyzer
system: the probes (general purpose probing); the HP lO32OC
to the Target
System
User-definable Interface; the HP 10269C with microprocess specific
preprocessor modules; and direct connection to a 20 pin 3M R Series
type header connector using the optional termination adapter (HP part
number
01650-63201).
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Since the probe interface hookups are microprocessor specific, they
will be explained in their respective microprocessor operating notes.
The rest of this chapter is dedicated to general purpose probing with
the logic analyzer probes.
Probing
2-a
HP 16528/1653B