User manual

COUNTER AC7E
7
Impo Electronic A/S, Svovlhatten 3, DK-5220 Odense SØ, Denmark · Tel. [phone] · Fax [phone]
INSTRUCTIONS FOR USE
1. Pilot lamp. Indicates, when lit, that mains power switch 2 is on.
2. Mains power switch. Rocker switch for power supply. On/Off. Press switch down for power on.
3. Display. 7-digit seven-segment LED display with 20 mm readout height. The result is
displayed with correct dicimal point and unit indication by LEDs 15 and 16. By result
numbering the second digit from left is blank and the result number is indicated (flashing) by the
leftmost digit.
4. INPUT A - electrical impulse. The input is DC coupled with automatic gain control (AGC control).
Frequency range DC to 2 MHz. The sensitivity in the range DC to 100 kHz is typically 50 mV
rms
.
Sensitivity in the range 100 kHz to 2 MHz increases from the typical 50 mV
rms
to 500 mV
rms
. The
input impedance is 1 Mohm/ / 100 pF.
Do not connect higher voltage than 250 volt (DC + peak), or more than 500 volt (peak - peak).
NB! When this input is in use, nothing may be connected to inputs 5 and 6.
5. INPUT A - switch. Connection for switch.
6. INPUT A - DIN. For plugging in and taking measurements with IMPO microphone and IMPO
photocell or other IMPO equipment with DIN multi-pin plugs, e.g. photo-active receiver, reaction
time box, stroboscope attachment etc.
7. INPUT B - electric impulse. The input is DC-coupled with fixed sensitivity control for approx.
2 volt peak. Input impedance 100 kohm/ / 100 pF. Do not connect voltage higher than 100 volt
(DC + peak).
8. INPUT B - switch. Connection for switch.
9. INPUT B - DIN. For plugging in IMPO microphone, IMPO photo-cell or reaction time box.
10. FUNCTIONS indicated by LED.
Change of function is achieved with 13.
PASSAGE TIME + TIME INTERVAL t
A
, t
B
, t
A->B
:
This function is used to demonstrate Newton’s second law, using the air track.
t
A
is the time it takes the vehicle to pass the photo cell connected to INPUT A.
t
B
is the time it takes the vehicle to pass the photo cell connected to INPUT B.
t
A->B
is the time between interruption of light beam A and interruption of light beam B. (From
leading edge to leading edge).
As soon as t
A
is finished, INPUT A extinguishes the LED 18 and the input is closed.
When t
B
is finished, INPUT B extinguishes the LED 17 and the input is closed.
The result of t
A
is now shown on the display as result No. 1. The other two results are called by
pushing the Display Result.
START A -> STOP B t
A->B
:
In input A use either 4 , 5 or 6, and
in input B use either 7, 8 or 9.
COUNTER AC7E
8
Impo Electronic A/S, Svovlhatten 3, DK-5220 Odense SØ, Denmark · Tel. [phone] · Fax [phone]
As one result only appears in this function, the sum is shown in seven digits direct on the
display as soon as the measuring has commenced with input A (LEDs 18 and 14 go out and input
A is closed). The time measurement is stopped with input B, the LED 17 goes out and the input is
closed. The time unit is indicated by the „mSec.“ LED 15.
When the test is finished, 12 emits a constant light to indicate that the only result available is
now shown on the display.
FUNCTION SELECTOR LED 14 is now on again, and when 13 is pushed in the counter
prepares itself for function selection (Described under 13).
FREQUENCY A
The signal frequency connected at input A ( 4, 5 or 6 ) is continously shown on the display. The
gate time is approx. 1 sec. or 1 period time, if the frequency is lower than 1 Hz. The display unit is
Hz, indicated with LED 16. The LED at input A is on, when the gate is open. DISPLAY RESULT LED
12 is flashing for every measurement completed. FUNCTION SELECT LED 14 is constantly on, as
the user may prepare for a new function by pressing F.S. (blue) button 13.
When the D.R. (red) button 11 is pressed, continous measuring is stopped, when the current
measurement is completed. LED 12 is now constantly on and the input LED 18 goes off. The
counter is now in the single measurement function, i.e. by pressing D.R. (red) 11 button a single
measurement is made, where the input LED 18 is on until the measurement is completed, and the
LED 12 flashes once and the result appears on the display. This may be repeated as often as
required (Example: used when measuring the frequency of a tuning fork). To revert to continous
measuring again, press F.S. (blue) 13 once.
UNIT COUNTING A
Selection of function/timer:
After the UNIT COUNTING A function has been selected with F.S. (blue) push button 13 , one
of the following count functions may be selected with D.R. (red) push button 11:
„00“ :Infinite (∞) counting with manual start/stop with D.R. (red) push button 11 and continued
counting without reset.
Reset is executed with F.S. (blue) push button after stop of counting with D.R. (red).
„01“ :Single measurement with a gate time of 1 sec.
Start by pressing D.R. (red) button.
„06“ :As „01“, but the gate time is 6 secs.
„10“ :As „01“, but the gate time is 10 secs.
„60“ :As „01“, but the gate time is 60 secs.
11 DISPLAY RESULT push-button
The push button is used to bring results onto the display screen, also to control single
measurements, frequency and period time and for impulse counting start/stop. See 12 below.
12 DISPLAY RESULT LED
Off: Push button 11 is not active and no results are ready.
Constant light: There are no „unknown“ results in the memory and the result shown is the latest
(singular). (If the display 3 is totally dark, the counter is in the programming
condition and 11 is active).