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AMPTEC 620EXV Intrinsically Safe Voltmeter and "No Voltage" Comparitor (Green LED "Safe"or Red "Hazardous Voltage level" daybright LED seen from 100 feet away)A NSN 6625-pending The AMPTEC 620EXV "No Volts" Intrinsically Safe Voltmeter is both an EEX certified "Intrinsically Safe" portable digital voltmeter and also a Voltage Comparitor with (daybright green LED) "GO - Safe level or No Voltage" or (daybright red LED) "NO-GO" a hazardous voltage level is present (preset level too high). The LEDs' can be seen from 100 feet away - It is used to safely monitor the absence or presence of any "stray" voltage (AC or DC or both) between any two connections (ie chassis and test point connection) in an explosive/volatile or hazardous atmosphere. It has both a daybright green "GO" LED for a preset level such as <60mV, 100 mV, 150 mV, 250 mV etc or any other voltage level (contact AMPTEC for details) indicator (for safe) and a red "NO-GO" LED for any level greater than the preset level ( >60 mV,100 mV, 150 mV, 250 mV etc, whenever an unsafe or hazardous voltage level becomes present. The DVM informs the operator of any voltage level from 10 mV up to 99.99 V, and withstands 120VAC input without damage. Checks test lead integrity and is British Defence Ministry Safety Board & ATEX Certified as an EEX Approved Safety Voltmeter.
from 0°C to + 50°C. After extensive environmental tests (1.0 KG Steel Ball Faceplate Impact, Temperature, Dust and Salt Water spray) and exhaustive electronic circuit and mechanical review (for Intrinsic Safety Compliance) SIRA an Independent British Testing Laboratory has certified the AMPTEC 620EXV Safety Voltmeter as "Intrinsically Safe". They further state the AMPTEC 620EXV has ATEX Safety Certified Rating as being Ex nA nL IIC T4 and is also Ex II 3G status from 0°C to + 50°C compliant. * 4 digit resolution from 0.00 volts RMS AC/DC Volts to 99.00 Volts AC/DC * Easy to Use , No Guess Work required, Voltage Monitor Comparitor - If any voltage (AC, DC or both) under test is less than (a specified level ie. 60 mV), it is considered safe and the green daybright "GO" LED is lit and PASS is displayed then the actual voltage. If the voltage is more than (a specified preset level ie 60 mV) its considered hazardous and the red daybright "NO-GO" LED is lit (visible from 100 feet away), and "Fail" is displayed and then the actual (ACVrms and or DCV) voltage is automatically displayed in standard digital voltmeter format. * Selected by the UK Ministry of Defence as the replacement for their aging inventory of old analog "No Volts" meters - ideal replacement for obsolete, and aging analog "No Volts" meter. The AMPTEC 620EXV offers uncompromising Safety, Ruggedness, 4 digit resolution, 0.1 milliohm resolution with "No Warm-up" required its ready to use when turned on. 
* Instant "ON", "No Waiting for a Warm-up Period", it's ready to use immediately after being powered up - The solid state internal reference(s) used by the AMPTEC 620EXV "No Volts" Safety Voltmeter make it ready to use the instant it's power switch turned "on". * Reinforced All metal ( Faraday Cage) construction (front, back and all sides), textured powder coated aero aluminum (AL 5052 alloy), all connected to front panel chassis ground jack - meets DEF STAN 59-41 Radiated Emmissions DRE01.B/DRE02.B and Susceptability DRS01.B/DRS02.B Standards . At -20°C, the unit's front panel has been hit with 1 KG Steel ball impact (from 0.7 meter drop) and still does not allow any water (IP-54) to penetrate into the interior of the instrument. * Separate battery compartment, operates on 4 ea "AA" re-chargeable NiMH batteries. They are field replaceable batteries without breaking the calibration seal. There is "No access to any electronics inside the unit's battery compartment". It's also water-tight (gasket sealed compartment) and is corrosive resistant Per MIL PRF 28800D to any battery leakage or any chemical corrosion. * Ruggedized use -Silicone rubber boot covers on all switches protects the instrument against saltwater spray, rain and dust. * United Kingdom's AMPTEC 620EXV "NSN package" includes 1) protective conductive carrying case, 2) Operator/maintenance manual and 3) U.S.A. N.I.S.T Traceable Calibration Certificate. The AMPTEC 620EXV No
Volts Rear Panel view of the AMPTEC 620EXV "No Volts" Safety Voltmeter The AMPTEC 620EXV "No Volts" Safety Voltmeter can typically operate for up 24 hours without a charge on its 4 "AA" NiMh batteries. The AMPTEC 620EXV "NO VOLTS" meter operates on 4 "AA" rechargeable batteries (NiMH ). It's automatically powered "off" and can't be used when charging. The battery compartment is separate from all electronics. The user can change batteries and not effect the instrument's calibration. Calibration is performed covers "ON", remove calibration sticker & hole plugs for access. The battery compartment cover is gasket backed to provide a water tight seal. The battery compartment is also MIL PRF 28800D compliant to be protected against any battery corrosion (leaking alkaline material). There is also a convient side panel mounted easy grip handle for carrying the unit outside of its padded case ( NSN package etc.). Easy to Calibrate "No Covers to Remove" In addition, once the tamper resistant calibration sticker is removed the the AMPTEC 620EXV No Volts Safety Voltmeter's rear panel, it's a breeeze to calibrate. There are "No Covers" to remove, the PMEL or calibration facility simply connects the 620EXV No Volts Safety Voltmeter's to the proper Voltage Standard and has two simply adjustments to make (trigger set@60 milliohms and fullscale set@30.00 VRMS ohm). Calibration hole plugs are also included (inside carrying case pocket) if the AMPTEC 620EXV No Volts Safety Voltmeter user desires to use them.
The AMPTEC 620EXV "No Volts" Safety Voltmeter Mil 5015C Compatible weather-proof Test Lead connector with cap provides a secure & popular military spec "Test Lead" connection. Other versions are available contact the Sales Department at AMPTEC RESEARCH for your requirements.  Photo of the AMPTEC 620EXV shown with the following components: Item A) MIL 5015 C Compatible Test Lead Connector with water tight cap (other versons available). Item B) Chassis (case) Ground Connector on side (standard DMM banana jack type) to prevent ESD. Item C) 4½ Digit LCD Display with Low Battery Indicator (runs for 24 hours on a single charge - uses rechargeable NiMH batteries). Displays 'PASS" if voltage is <60 mV or "FAIL" if the voltage is >60 mV, displays the actual voltage (Both ACV and/or DCV ), Displays cable test integrity and Over-Range Indicator as just a few examples. Item D) Display Back-Light switch (silicone rubber boot switch cover protection) high contrast yellow. Item E) Power On/Off switch (hold down for ~ 2 seconds for “Power On”) silicone boot cover protected. Item F) Self-Test Display Status Indication Item G) Easy Interpretation of voltage measurement test/result by operator - Green LED for "GO" (pass if voltage measured is <60mV and Red LED for "FAIL" if voltage is >60 mV .
   Whether its sprayed with a saturated salt fog mixture, or micro-fine dust particles, frozen to soak @ -13°C, heated to +55°C, or vibrated and then shock bumped a 1000 times the AMPTEC 620EXV "No Volts" Voltmeter PASSES all United Kingdom Ministry of Defence DEF STAN 66-31 tests and keeps working. The bottom line, the AMPTEC 620EXV Safety Voltmeter is rugged and withstands cold winter flight line use and use in hot summer desert heat/dust and keeps working without a problem.
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