TM 5-6675-324-14
c.
Point counter pen. Used to count items of a similar type found on a map,
blueprint, plan, etc. Each time the point counter pen is stroked in counting, the
transducer in the pen emits a signal pulse which is sent to the auto-scaler for
totaling.
d. Drafting bridge. A layout instrument and mount for the encoder of the
planimeter. When the encoder is moved from the planimeter and mounted on the
drafting bridge, it can be used for linear measurement and detailed layout work.
5-3.2 Auto-Scaler. Processes pulses emitted by measuring instruments. The pulses
are input into the rear of the auto-scaler through the applicable input jack (El,
E2, or POINT COUNT). There are two modes of entry to the auto-scaler, NORMAL and
SCALE. This is determined by the NORMAL/SCALE switch. When switch is on NORMAL,
pulses bypass the scaler circuit and are applied to the decade up/down counter.
When the switch is on SCALE, pulses are first input into the scaler circuit
before counting.
The auto-scaler has five functional components: scaler, decade
up/down counter, LED display, calculator interface circuit, and command switches.
a. Scaler. Enables operator to perform a scale reduction of the pulse count.
When activated by NORMAL/SCALE switch, the scaler uses a correction constant to
divide input pulses. The correction constant is input by setting dials. Pulses are
then sent to the decade up/down counter.
b. Decade up/down counter.
Counts pulses received from the measuring instru-
ments or scaler circuit. It counts up or down, depending on the direction that the
measuring instrument is moved. The pulse count is continuously output to the calcu-
lator interface circuit and scaler LED display.
c. LED display. Displays current total of the decade up/down counter. The
decimal place for the display is controlled by the DECIMAL switch.
d. Calculator interface circuit. Converts the pulse count into data compat-
ible with the calculator and then transmits it through a ribbon cable to the
calculator. Converts and transmits signals from the command switches. When switch
is on AUTO, data is automatically and continuously transmitted to the calculator.
When switch is on MAN, data is transmitted only when the PRINT command is received
from the PRINT X command switch on the calculator.
e. Command switches. Control the operating modes of the auto-scaler, data
transmission, and remote operation of the calculator. There are six command
switches: CLEAR, PRINT, INIT, X MEMORY, MAN/AUTO, and ACCU.
(1) CLEAR. Command is sent to clear LED display on calculator and LED
display and decade up/down counter on auto-scaler.
(2) PRINT. Command sent to signal calculator to implement instructions of
subroutine E, stored in memory, which prints the pulse count data. PRINT also
initiates transmission of that data for printing when auto-scaler is in MAN.
(3) INIT. Command sent to signal calculator to implement subroutine D, which
resets memory data registers for the next set of data.
5-8
