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Model 5340A
Theory of Operation
4-283. A31 -5 Volt Regulator Assembly, 05340-60024
4-284. The -5 volt regulator assembly (Figure 8-34) consists of two supplies, one for the RF
circuits (-5V) in the 5340A and the other for the digital circuits (-DG). The supply for the RF
circuits provides about 190 milliamperes and the digital supply provides approximately 1.1
amperes. The R F supply consists of a preregulator A31Q1, A3lQ2, A31Q3, and A31CR1. A31Q8
is the series pass transistor and A31Q4 serves a s the regulator driver. The circuit is similar to the
-15 volt regulator previously described. A31R17 sets the current limit point and A31R13 and
consists of A31U2, A31Q6, A31Q7, and Q1 which is mounted on the rear panel. Connection to
regulator previously discussed except that no preregulator is used.
4-285. A34 Theory of Operation, 05340-60067 (Part of Option 011)
4-286. There are two basic modes of remote operation for the 5340A, they are TALK and LISTEN.
The three wire handshake must occur before the instrument can function in either mode. A35S6 is
the "Talk Always-Addressable" switch. I n the "Talk Always" mode, A35S6 keeps the talk flip-
flop (U7) in the set condition. This allows the 5340A to communicate with a simple listener that
doesn't have addressing capability. When A35S6 is in the "Addressable" position, the instrument
can be either a talker or listener. A low on IFC is a direct clear, which resets U6 and U7.
4-287. Talk Mode
Low and the controller sends data via DIOl through DI07. Switches A35S1 through A35S5
establish the 5-bit binary code which is a n arbitrarily designated address of the 5340A. U14 com-
pares this code to the data on lines DIOl through D105 and outputs a high when coincidence oc-
curs. D106 and D107 carry the information which determines whether the instrument will func-
tion as a talker or listener, this information is decoded by U6 a n d U7. The controller set DAV Low,
this signal is delayed by R4, C2, and R5, C3 which allow transients to die down. As
through R5, UlD(11) will remain high. This enables U5A to provide the clock pulse for U6 and
U7. U5A also receives the IFC signal which must be high. ATN low will enable the RFD driver
wire handshake. (See Section I1 for a more detailed explanation of the handshake). When U5A
clocks U6 or U7, only one will set. When Talk Flip-Flop U7 is set, UllB(6) goes high enabling the
DIOl through D107 drivers UZA, B, C,
enable the RFD and DAC listeners U13C, D. U13C provides the qualifier for test #3 of the pro-
gram (HRFD
?)
and U13D provides the qualifier for test #10 (HDAC
4-289. The second sequence of the Talk Mode is data outputting. After handshaking, the con-
troller sets ATN high to disable the RFD and DAC gates (UlOB,C). The instrument can now out-
put measurements it has taken via the DIOl through D107 drivers. SRQ (Service Request) is a n
output driven low by UlOD when the instrument has been programmed to wait in the output
phase of it's operating cycle until addressed to output.
4-290. Listen Mode
4-291. In the first sequence of the listen mode, the 5340A is addressed to listen.
the address sequence of ,the ,talk mode, with the exception that command on the DIOl through
D107 lines now tells the instrument to listen. U6
4-292. The second seqpence
allow the instrument in this mode of operation to have control of these lines. The DAV driver (U4D)
is disabled. At this point in the sequence, the instrument is ready to accept data.
4-54
D,
is
I
F
.
listening. UllC(8) enables the RFD and DAC drivers (UlOB,C) to
is
?).
set and U5B(8) goes low for the duration of
C3
charges
It
is identical to
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Troubleshooting
