JCS - Model GMS1800a -Dual Channel Laboratory Counter
The GMS1800a can be used with industry standard Alpha and Beta detector drawer units (such as the AEA Technology I Harwell Instruments types ‘ADU’ and ‘SDU’, 0744, 0771 and 0772), or with other instruments providing digital pulse output signals.
The Laboratory Counter is a microprocessor based unit which may be used to count digital pulse signals over a range of user selectable counting periods. It is a compact and robust unit suitable for laboratory or field use.
GMS1800a is powered either by an internal rechargeable battery or externally by a mains supply unit, which recharges the battery at the same time. The instrument can also operate from a 12V DC source such as a vehicle battery, making it convenient for mobile field surveys.
The unit provides two counting channel inputs and displays the accumulated counts in each channel over a user- selected counting period. The unit may alternatively display the count difference between the two input signals.
- Two independent counting inputs
- Simple operation
- Battery & mains power
- Suitable for laboratory or field use
- Output to computer or printer
- User-selectable time interval
- 50kHz maximum counting rate
- Deadtime correction
- Maximum count > 4×109
- Robust metal case
- Inputs:
- ‘ADU’ Alpha Drawer Unit & Type 0744, 956012
- ‘BDU’ Beta Drawer Unit & Types 0771,0772, 956025
- TTL
- Outputs: RS232 for connection to a computer or printer
- Counting:
- Maximum Rate: 50kHz on each input
- Maximum Count: 4,294,967,295 (232?¹)
- Duration: Maximum (free running) count duration is 99,999 sec.
- Repeat: Automatic repeat counting operation up to 10 times, with individual count results retained for review
- Dead time: Provides dead time correction, using user defined dead time values
- Indicators:
- Alphanumeric Display: 4 line 16 character LCD with LED backlight
- Power Indicator: Yellow lamp is lit when the instrument is powered
- Counting Indicator: Counting Indicator - A green lamp is lit when the instrument is counting, and the lamp flashes when the count is completed.
- Power Supplies:
- Internal: Maintenance-free lead acid battery
- External: Mains operation, 240VAC or universal input (110~240VAC) options
- Vehicle: 12V DC supply adapter for vehicle operation 2.1 mm DC power socket on rear panel
- Controls:
- Main Buttons: Two Control Buttons which are used together with menu captions shown on the display
- Main Dial: A rotary control selects the count duration (10, 30, 60, 100, 300, 600, 1000, 1800, 3600 seconds and free running), and also switches the instrument on.
- Battery: Battery isolation switch on rear panel
- Battery:
- Life: >10 hours battery operation with two drawer units connected
- Status: Battery voltage is shown on display
- Environmental:
- Environmental Protection: IP 30
- Temperature Range: Temperature range +5°C to +40°C
- Case: Strong metal case made of aluminium sheet with cast front bezel, Two front feet can be extended for easy viewing
- Size: H100 mm (feet folded in), D200 mm, W230 mm
- Weight: 2.2 kg