HP E42 manual Signal Mnemonics, Mnemonic Description, Arm, Dvm

Model 5328A

Schematic Diagrams

	Table 8-1.Signal Mnemonics
MNEMONIC	DESCRIPTION
A	Output of Time Interval Unit, A channel. ECL levels.
x
R (AO)	Non-latched ROM bits that drive Arming Multiplexer select
R (A1)	lines on Function Selector. TTL levels.
B	Output of Time Interval Unit, B channel. ECL levels.
B
C	Output of C module, the carry input for the FS decade.
C	ECL levels.
C ARM	Active high TTL line used for module C arming
	measurement.
CLK	Clock. Digit address clock to display. TTL levels.
Data A
Data B	TTL 4-bit BCD code. Data going to display and HP-IB.
Data C
Data D
Digit A
Digit B	TTL 4-bit digit address code. Controls interchange
Digit C	of data.
Digit D
DVM	Frequency line counted by Function Selector to give display
	reading. ECL level.
F Code A (FA)
F Code B (FB)	Function code from function switch. TTL levels.
F Code C (FC)
F Code D (FD)
FS	Function Selector.
GOSC	Gated oscillator. ECL levels.
GOSC
HDS	TTL level high disables synchronizers.
HDSA	Used by Option 011 HP-IB Interface to strobe bus data in
	remote listener.
HLS	TTL level line used to strobe latches.
RL (HOPN)	Latched ROM line which locks open Function Selector
	main gate.
HPL	Same as LDP.
HRD	High resets decades. TTL active high.
HRS	High strobes 4K ROM, TTL active high.
HRTB	High resets time base. TTL active high. Also resets
	Function Selector.
R (HTBA)	Non-latched ROM bit which enables the TTL level Channel A
	signal from the Function Selector to be counted by the
	Time Base.

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