HP 4328A Service Manual

Section III
Paragraphs 3-35 to 3-46
3-35. Probe Installati.on
3-36.. Plug in the probes to the connector at the end
of 16l43A Probe Cable. Note that the probe plugs
must be oriented correctly before plugging m.
1) Connector at the end of probe cable has 4-
contacts Each pairof closely--spaced contacts
comprise one set of probe contacts.
2) Plug the probe pms in to the connector such
that the off set Side faces outwards.. Refer to
Figure 3-5.
t
16143A
Figure 3-5. Probe Installation
3-37. 16005A CLip-type Probe
3-38. General purpose, alligator-jaw contacts pro-
vide positive gripping of samples. Upper contact
(marked "V"l is voltage termmal and lower contact
is current terminal. When using this probe in 1 mn
range, It is not alway-s possible to measure the sample
because of extreme deflectwn of the meter. Figure
3-6 shows 16005A Clip-type Probes.
Figure 3-6. 16005A Clip-type Probes
3-39. 16006A Pin-type Probe
j
/
3-40. Probe tip is a voltage terminal and outer con-
ductor ts a current terminal. Probe tip is spring-
loaded, so that both terminals firmly contact the
sample under test. This probe LS usefulfor press-an
contact measurement such as printed board conduc-
tivity measurements. When using this probe m lmn
range, itis notalways possibleto measure the sample
because of extreme deflection of the meter. (See
Figure 3-7).
3-6
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Model 4328A
Figure 3-7.. 16006A Pin-type Probes
3-41. 16007A!B Test Leads
3-42.. These are provided for standard 4 -terminal
measurements.. Each pair of testlead has a separate
alligator clip voltage and current terminaL 16007A is
furnished with a red cover the 16007B with a black
cover.. The black test lead is the voltage terminal and
the grey test lead IS the current terminaL
(See Figure 3-8)
Figure 3-8.. 16007A/B Test Leads
3-43. NOTES ON OPERATION
3-44.. IN USING THE 1 AND 3m OHM RANGES,
CONNECTION OF CURRENT TERMINALS
TO THE SAMPLE MUST BE A FIRM,
POSITIVE CONTACT.
3-45.. With Model 4328A, the internal resistance of
the constant current generator is approximately-equal
to the set range x500 Therefore, at 1m ohm and
3m ohms ranges, the internal resistances are 500m
ohms and 1. 5 ohms respectively.. Excessive resist-
ance at the probe contact can therefore relatively
larger error than on other ranges, The quahty of the
connection of the probes to the sample may be deter-
rowed by applying pressure on the connection point
and noting if the meter needle deflects.. Very poor
contact or no contact whatsoever 1s mdicated by- a
deflection off-scale
3-46.. IN USING THE 1 AND 3m OHM RANGE
LARGE ELECTRICALLY CONDUCTIVE
MATERIALS SHOULD NOT BE PLACED
CLOSE TO THE PROBES OR THEIR
CABLES,

HP 4328A Specifications

General

Brand	HP
Model	4328A
Category	Measuring Instruments
Language	English