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Model 5328A
Schematic Diagrams
Table 8-1. Signal Mnemonics (Continued)
MNEMONIC
DESCRIPTION
RL (HTBB)
Latched ROM bit which enables the TTL level Channel B
signal from the Function Selector to be counted by the
Time Base.
R (HTBO)
Non-latched ROM bit which enables the time base to count
the oscillator output.
RL (IA)
TTL level latched ROM bits that drive High Speed
RL (IB)
Multiplexer select lines on Function Selector.
RL (IC)
L ANN
Low annunciators. TTL active low turns RHS annunciators
on. Must be timed with digit address code to display
selected annunciators.
LDDCA
Low disable Decade Counting Assembly (DCA). TTL active
low disables DCA so that all DCA outputs are high.
LDI
Low disable indicators. TTL active low blanks RHS
annunciators and all decimal points.
LDDIS
Low disable display. TTL active low blanks display except
LHS annunciators.
LDP
Low decimal point. TTL active low turns decimal points on.
Must be timed with digit address code to display selected
decimal points.
LDSW
Low disable switches. The active low disables the FUNCTION
RESOLUTION and RESET switches. Allows module control.
LEXT
Low external. TTL active low disables function and
resolution switches for external control and lights RM
annunciator.
LINH
Low inhibit. TTL active low inhibits starting new
measurement.
LMG
Low main gate. TTL active low indicates main gate open.
RL (LMGF)
Latched ROM bit to Function Selector which selects the main
gate F/F on the Function Selector to establish the gate time.
LMRES
Low when reset signal comes from display. Provides power-
up type reset.
LRES
Low reset. TTL active low resets when FUNCTION,
RESOLUTION, or RESET switch settings are changed.
Also resets when DVM switches are changed. Provides
power-up type of reset.
R (LST)
Non-latched ROM line which is high in stop totalize and low
in start.
RL (LTOT)
Low totalize. Latched ROM bit low in totalize mode.
TTL level.
LTR
Low transfer. TTL active low used in DCA.
MG
Main gate. Accurate signal to drive remote gate such as
MG
channel C. ECL levels.
OSC
10 MHz oscillator. TTL level.
8-5