HP 5300A - Digital Recorder Output

Model 5300A
Theory of Operation
Figure
4-10.
5300A
Mainframe
Digital
Recorder
Output
Alj2
+5V ———_—,-> A10, B10 +5V
1,81 GNO
Algl
Ag QO ——_______________ Yt e9 fz
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MANUAL
RESET 32 1
a {
HOLD 4
TO US{(6)
PRINT
RAL
OP COMMON O
) +5V00 37)
Us
V
The display may also be held by a contact closure to
ground from the rear panel to the HOLD input. This
allows the charging of the capacitor to take place, but
inhibits the discharge and the reset cycle. If the
HOLD signal is removed after the capacitor is fully
charged, the reset and inhibit cycles are completed
within a few milliseconds and a new measurement
begins. The system can be cleared by a low signal at
the MANUAL RESET input from the front panel
RESET switch or from the rear panel.
4-47. A1J1 CONNECTOR
4-48. Inputs to the 5300A Measuring System main-
frame and programming of its functions are provided
from the plug-on module via a 50-pin connector
ag M
Be S
as x AiJ2 DIGITAL RECORDER
B6
RESET
HOLD VIEW FROM REAR
PRINT
DATA
CLOCK
START
DATA
DECIMAL
OVERFLOW
(AlJ1) in the center of the instrument. The connector
signals are as listed in Table 4-2.
4-49. DIGITAL RECORDER OUTPUT
4-50. The 5300A rear-panel connector AlJ2 provides
data outputs to a digital recorder or similar device
(Figure 4-10). The digital and decimal-point infor-
mation is carried as a character-serial, four-bit
parallel code, with the decimal point inserted at the
correct position. Parallel output lines carry the units
and overflow information and the output control sig-
nals. Data is derived from A1U3 Counter or from the
plug-on module as a four-bit parallel code, and is
buffered by the U6 gates. The displayed information
4-11