Click here for Stray Current Testing Procedures
MODEL 109SC Blaster's Ohm Meter w/Stray Current Tester Kit
The 109SC Kit uses the same meter as the Model 109 but allows checking for stray current. The 109SC is a safety MUST when using electric blasting caps. Remember, stray current must be tested for prior to any electric blasting operation, OSHA 29CFR 1926, 906B and MSHA 30CFR 77.1304.TT.
Meter Specifications
Model 109SC
Weight 5 LBS. (2kg)
Size 10.8 x 9.85 x 4.5 (274x250x114 mm)
Seal Dust and Damp Weather Proof Weather Proof
MSHA Approved NO
Ranges 8 Range w/stray current testing.
Battery Type 9V NEDA 1604/1604A
Current Output <4mA
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109SC Digital Multimeter with stray current test procedure:
1. Drive first stake into soil near the blast line. This will be the center stake.
2. The second stake will be moved around the center stake at various points within the blast site, Connecting wire may be run from each stake to the tester. (For each test, this stake will have to be driven in 6" - 8" and be tight).
Note: SOIL MUST BE MOIST IN THE STAKE AREA. IF SOIL IS DRY, ADD WATER UNTIL SOIL IS MOIST.
3. Connect meter with the red lead to one stake and the black lead to the other stake. Direction (Polarity) does not matter.
4. Turn the dial to the "2" setting, and note reading (DCV) then (ACV). If the reading is greater than .049 on either DCV or ACV, or the combined total of ACV and DCV, run the test again depressing the button on the top of the black box instrument. This shunts the leads with a 1 ohm resistor.
NOTE: WHEN THE SHUNTING BUTTON IS USED, IT SHOULD NOT BE DEPRESSED FOR MORE THAN 10 CONSECUTIVE SECONDS FOR ANY ONE MEASUREMENT, FAILURE TO FOLLOW THIS REQUIREMENT COULD RESULT IN THE CIRCUIT BOARD OVERHEATING.
The readings should drop to near zero. If the readings are still greater than .049, stray current is too high and the source will have to be found or a non-electric system will have to be used.
NOTE: IT IS HIGHLY RECOMMENDED THAT THE USER REVIEW THE SECTION ON STRAY CURRENT IN THE "ISEE EXPLOSIVES HANDBOOK". THIS SOURCE EXPLAINS IN GREATER DETAIL THE CHARACTERISTICS OF STRAY CURRENT AND HOW TO TEST FOR IT.
NOTE: THIS METER IS NOT MSHA APPROVED FOR THE USE IN GASSY MINES
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Specifications:
The HD110C is designed for professional use in harsh environments. The meter is unusually rugged and reliable in everyday heavy use applications. The meter is made using waterproof construction to prevent dirt, grime and moisture from entering the case and causing inaccurate readings or damaging shorts. Built of tough, fire-retardant thermoplastic resistant to grease and chemical spills, with all sensitive components shock-mounted for a drop resistant to at least eight feet.
HD110C has an extended voltage measurement capability of 1500 V dc and 1000 V ac, unmatched by any other line of digital multimeters. The extended voltage ranges can withstand transients up to 12 kV.
HD110C Technical Specifications
General Specifications
Display: 3-1/2 digit LCD, 1999 counts, with annunciators and menu features
Polarity Indication: Automatic
Input overload indication: 1
Low Battery Indication: Battery < 50 hours battery life remain, accuracy is no longer guaranteed
Display Update Rate: 2.5/sec, nominal
Oper. Temp.: 0°C to +50°C, (< 75 % R.H.)
Storage Temp.: -20°C to 60°C, 0 to 80 % RH, battery removed
Temperature coefficient: 0.1 x (spec. accuracy)/°C (0 ° to 18 °C and 28° to 50 ðC) all functions and ranges except for mVDC
0.3 x (spec. accuracy)/°C (0° to 18°C and 28° to 50°C) for mVDC
Altitude: Up to 2000 m - indoor use
Fuse: F 2 A/1500 V fuse (8 mm x 65 mm), I.R. 30 kA - Amprobe p/n FP700
Power: Standard 9 V battery, NEDA 1604, JIS 006P,IEC 6F22Auto Power-Down Meter powers down after approx. 30 min. of inactivity.
Battery Life: 250 hours typical with carbon-zinc, 500 hours typical with alkaline
Dimensions: (H x W x D) 200 x 102 x 59 mm (7.9 in x 4.0 in x 2.3 in)Weight (incl. battery) 642 g (20 oz)
Accessories: Heavy Duty CAT IV 1000 V Test leads with threaded alligator clips (TL1500), battery (in instrument), hex wrench in holster, Magne-Grip flex strap and User Manual
Case: material Flame retardant, high-impact thermoplastic
Safety Meets: EN 61010-1 CAT IV 1000 V (1500 V DC max) Class II, EN 60529:IP67
EMC: Meets EN 61326-1
Electrical Specifications (Accuracies at 23°C ± 5°C, <75 % RH non-condensing, guaranteed for one year.)
Function Range Accuracy
DC Volts
Ranges: 200 mV, 2 V, 20 V, 200 V, 1500 V
Resolution: 0.1 mV
Accuracy: All ranges ±(0.1 % rdg+2 dgts)
Input Impedance: 10 M ohms
OL Protection: 1500 V dc/1000 V ac rms
Transient Protection: 12 kV impulse (1.2 ¼S/50 ¼S) based on EN 61010-1:2001 impulse requirement for at CAT IV 1000 V product. This product should not be used in installations where transients exceed 12 kV.
AC Volts (45 Hz to 2 kHz)
Ranges: 200 mV, 2 V, 20 V, 200 V, 1000 V
Resolution: 0.1 mV
Accuracy: 200 mV to 200 V (45-500 Hz) ±(0.8 % rdg+4 dgts)
. 200 mV to 200 V (500 Hz-2 kHz) ±(1.5 % rdg+5 dgts)
. 1000 V (50-60 Hz) ±(0.8 % rdg+4 dgts)
. 1000 V (60-500 Hz) ±(1.5 % rdg+5 dgts)
Input Impedance: 10 M ohms
OL Protection: 1500 V dc/1000 V ac rms
Transient Protection: 12 kV impulse (1.2 ¼S/50 ¼S) based on EN 61010-1:2001 impulse requirement for at CAT IV 1000 V product. This product should not be used in installations where transients exceed 12 kV.
DC Current
Ranges: 200 ¼A, 2 mA, 20 mA, 200 mA, 2 A
Resolution: 0.1 ¼A
Accuracy 200 ¼A to 20 mA ±(0.5 % rdg+2 dgts)
. 200 mA to 2 A ±(1.0 % rdg+2 dgts)
Function Range Accuracy
DC Current (cont.)
Voltage Burden: 250 mV max. (1 mV/1 ¼A on 200 ¼A Range)
. (100 mV/1 mA on 2 mA Range)
. (10 mV/1 mA on 20 mA Range)
. (1.5 mV/1 mA on 200 mA Range)
. (500 mV/1 A on 2 A Range)
OL Protection: A Input (F 2 A/1500 V, size 8 x 65 mm IR fast blow ceramic) (FP 700)
AC Current (45 Hz to 1 kHz)
Ranges: 200 ¼A, 2 mA, 20 mA, 200 mA, 2 A
Resolution: 0.1 ¼A
Accuracy 200 ¼A to 20 mA ±(0.8 % rdg+4 dgts)
. 200 mA to 2 A ±(1.2 % rdg+4 dgts)
Voltage Burden: 250 mV max. (1 V on 2 A range)
OL Protection: same as DC Current
Resistance
Ranges 200 ohms 2 k ohms, 20 k ohms, 200 k ohms, 2 M ohms, 20 M ohms
Resolution 0.1 ohms
Accuracy 200 ohms ±(0.5 % rdg+4 dgts)
. 2 k ohms to 200 k ohms ±(0.3 %rdg+2 dgts)
. 2 M ohms ±(1.0 % rdg+4 dgts)
. 20 M ohms ±(2.0 %rdg+4 dgts OL Protection 1500 V dc/1000 V ac rms
Open Circuit Voltage: 200 ohms range 3.0 V dc typical
. all other ranges 0.3 V dc typical.
Diode/Continuity Test
Test Current: 1m A dc typical
Test/Open Circuit Voltage: 3.0 V dc Typical
Diode Accuracy: +/-(1.5 % rdg+2 dgts)
Continuity Audible Threshold: <50 ohms +/- 25 ohms
Response Time: <100 msec
OL Protection: 1500 V dc/1000 V ac rms