GSM-500 Auto-Ranging Survey Meter

GSM-500 Auto-Ranging Survey Meter


This microprocessor-controlled instrument represents the gold standard of survey instruments. The GSM-500 is a digital ciruitry instrument with an analog display that automatically chooses the correct range with no user intervention required. Comes standard with probe saturation and other error indicators.


Input Sensitivity 0.050V
External CPM/Dose Switch External Switch selects CPM mode or Dose Linearized mode
Four Linear Ranges 0-0.2, 0-2,0-20,0-200 mR/hr
0-500,0-5,000, 0-50,000, 0-500,000 CPM
Ranges will depend on selected probes
Calibration Controls Each mode & range has separate non-interacting controls
Diagnostics HV Out of Range, Battery Low, Probe Over Range
Range Adjustment Auto-Ranging
Electrical Non-Linearity +- 5% of Full Scale
Response Time Optimized for Each Range
Drift <5%
Audio On-Off Front Panel Switch, water and solvent resistant
Environmental -20° F[-28° C]-140° F[60° C] | 5-95% RH IPX4 Housing
High Voltage Adjustable 300-1500 VDC|Regulation +-1%
Low Voltage +5 VDC & -5 VDC Regulation +-0.5%
Battery 6 "AA" Alkaline-400 hours nominal
Meter 3.5" Scale | Ruggedized Meter Movement
Calibrated 0-500 | 0-0.2 | Linearity +-3%
Circuitry Digital Microprocessor Controlled w/Analog Readout
Dimensions 5.25" (14cm) H x 4" (10cm) W x 7" (18cm) L
Weight 2.5 lbs. (1.2 Kilos)
Probes Supports all Johnson Probes
Probe Energy Response Depends on Selected Probes


Downloadable Datasheet, Product Manual & Other Resources