HyQuest Solutions CMC20A User manual

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QUALITY SYSTEM
ISO: 9001
CERTIFIED
OPERATING MANUAL
CMC20A
Current Meter Counter
HYQUEST SOLUTIONS PTY LTD
48-50 Scrivener St, Warwick Farm, NSW 2170, AUSTRALIA
Phone: [phone] Fax: [phone]
Email: [e-mail]
Web: www.hyquestsolutions.com.au

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CMC20Ainstructionmanual2Issue2:19/5/2016
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TABLE OF CONTENTS
1. SPECIFICATIONS.......................................................................................................................................3
2. INTRODUCTION........................................................................................................................................4
3. SPECIFIC FEATURES...............................................................................................................................4
4. PANEL LAYOUT.........................................................................................................................................5
5. CONTROLS..................................................................................................................................................5
5.1 START..........................................................................................................................................................5
5.2 STOP ............................................................................................................................................................5
5.3 ROTARY SWITCH .........................................................................................................................................5
5.4 DISPLAY ......................................................................................................................................................6
5.5 SETTING CONTACT DEBOUNCE TIME...........................................................................................................6
5.6 DISPLAYING THE CMC20A FIRMWARE REVISION.......................................................................................6
6. ANNUAL SERVICING................................................................................................................................6
7. FAULT FINDING.........................................................................................................................................7

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CMC20Ainstructionmanual3Issue2:19/5/2016
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1. SPECIFICATIONS
Housing: Weatherproof powder coated aluminium die cast case with nylon
webbing adjustable neck strap.
Display: 4 Digit liquid crystal display rated to 80oC.
Accuracy: + 0.1 seconds (Timed from first contact closure)
+ 1 pulse
Timer: Quartz crystal accuracy, better than 1 in 20,000.
Preset Facility: Time intervals of 10, 20, 30, 40, 50, 80, 100, 200 and infinity
seconds.
Infinity Mode: INT. This mode is used for taking discharge measurements by the
integration method, for use with ground-feeler weights or for manual
operation of counter.
Contact Debounce: The current meter pulse is debounced in software. The debounce
time is user selectable. (1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30,
35, 40, 45mS) This is useful for a meter with a mechanical “cat
whisker” contact wire.
Buzzer: Instantaneous beep for each current meter pulse except in the
integrate mode. In the integrate mode, the buzzer gives a continuous
beep while the current meter switch is closed.
Power Supply: 9V DC - 6 AA Alkaline batteries. The actual battery voltage is
displayed for 2 seconds each time the unit is switched on. Low
voltage is also indicated by all decimal points showing on the display
at 5.8 volts.

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CMC20Ainstructionmanual4Issue2:19/5/2016
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2. INTRODUCTION
The CMC20A is an enhanced version of the familiar CMC20, being a self-contained
instrument featuring microprocessor control circuitry, a quartz timebase and a liquid
crystal display. The counter is powered by 6 x AA size alkaline cells which ensure cheap
and easy replacement.
Low battery voltage below approximately 5.8 volts is indicated on the display by the
showing of all decimal points.
An internal buzzer sounds at each contact closure during the timing period to indicate
correct operation.
The display on the CMC20A gives continuous indication of the pulse count during the
course of the reading period - and indicates with a resolution of 1 to a maximum of 9999
counts.
3. SPECIFIC FEATURES
This simple counter displays the accumulated pulse count for a range of preset time
periods. In addition the “integrate” range is included for use when integrating depth
measurements are made with a ground-feeler weight. in the “integrate” mode the buzzer
sounds continuously while the contacts are closed and counting continues until
interrupted manually by the “Stop” switch. The use of a supplementary timer is necessary
in this mode.
The enhanced features of the CMC20A include :
Actual battery voltage displayed on power up.
User selectable contact debounce time.
More accurate timing – the timer is started on the first contact closure
Note: This closure does not increment the counter.

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CMC20Ainstructionmanual5Issue2:19/5/2016
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4. PANEL LAYOUT
5. CONTROLS
5.1 Start
Resets the display and prepares for the preset time interval. (The colon on the display
indicates that start has been pressed)
Note : Timing commences on the first detected contact closure. The count will not
increment on the first closure, only subsequent closures. This ensures that timing is
accurate.
5.2 Stop
Stops further counting - and allows the counter to be reset and restarted by the Start switch.
5.3 Rotary Switch
Selects a range of preset time periods and the integrate mode for use with ground-feeler
weights.
Rotar
y
Switch
Meter

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CMC20Ainstructionmanual6Issue2:19/5/2016
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5.4 Display
Displays counted pulses during normal operation.
On power up the display indicates the battery voltage. (eg “ 8:9” represents 8.9 volts)
5.5 Setting Contact Debounce Time
To display or change the contact debounce time:
Press and hold the “Start” button as the unit is switched on. The left 2 flashing digits
indicate the contact debounce time in milliseconds. The right 2 steady digits indicate
the pulse count.
Press the “Start” button to increase the contact debounce time.
Press the “Stop” button to decrease the contact debounce time.
In this mode the buzzer and counter is enabled, so an indication of the current meter
performance can be gauged as the debounce time is altered.
When satisfied with the setting, rotate the Rotary switch one click in any direction.
This will save the selected debounce time for all future use. Note that this is saved even
when the unit is switched off, or batteries are removed.
5.6 Displaying the CMC20A Firmware Revision
To display the Firmware Revision :
Press and hold the “Stop” button as the unit is switched on. The display will show the
Firmware Revision for 2 seconds. (eg “ 1:00” indicates Revision 1.00)
6. ANNUAL SERVICING
Replace batteries and regenerate silica gel by heating contents of capsule at 100oC for one
(1) hour [until blue].

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CMC20Ainstructionmanual7Issue2:19/5/2016
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7. FAULT FINDING
Symptom Possible Cause Action
No count or audible signal
while meter propeller is
turning.
Faulty leads or connections at
terminal. Check leads for continuity.
Check condition of plugs.
All decimal points showing on
display. Low battery voltage. Check voltage – low level is 5.8volts.
(When unit is switched on, the
battery voltage is displayed for
2 secs.)
As meter gets faster, the count
stops. The contact debounce time is set too long. Reduce the contact debounce time.
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