5. With Test Leads Shorted-
Line up pointer with "0'' mark on
ohms scale by turning Small
Black Knob on right side of
instrument (Fig 17)
NOTE: If ohmmeter zero adjust
knob does not line pointer up on zero
mark, replace battery with a new one.
Oxidation on base of battery can cause
poor contact. Sand lightly to assure good
contact.
6. To Measure Resistance
between any two points on a
device, simply apply the clip lead
and the ohmmeter attachment
probe tip and read pointer.
HOW TO READ OHMMETER SCALE
The ohmmeter scale is located on the flat plate along the righthand edge of the
window. The zero mark (beginning) is on top of the scale while the infinity mark
“
∞
” ends the scale.
OPTIONALEXTENDO LEADS
FOR FASTER AND EASIER VOLTAGE TESTING
EXTENDO TESTLEADS. Cal. No VLK-411R. have
5 inch long insulated probes for a man-sized grip.
One probe clamps between instrument jaws.
Optional alligator clip adaptor (Cat No VRC-320)
converts probe so it can be fastened to test point.
Probe tips are replaceable (Cat No VPT)
Fig 19
FACTORY SERVICE
If the instrument fails to operate, check battery, test leads, etc and replace as
necessary. If the instrument still malfunctions, please call the phone number
listed below:
Tel: 954-499-5400 - 800-327-5060
Outside the U.S.A. the local Amprobe representative will assist you.
RANGE-EXPANDING ACCESSORIES
*Intermittent duty
All of the above are clamp-on type transformers. Models CT-50-1 (six link) and
CT-50-2 (four link) are flexible link construction.
Request Cal. No, AAD38.
Mode
A50-1
CT-50-1
CT-50-2
Ratio
10 to 1
50 to 1
50 to 1
Maximum Range Capability
1,200 amperes*
6,000 amperes*
3,600 amperes*
OTHER ACCESSORIES & REPLACEMENT PARTS
Model
Description
VL-11R..............................................................................Leads
VLK-411R.........................................................................Extendo Leads
VPT...................................................................................Replacement Tips
OHB-3HE .......................................................................Ohmmeter Attachment
8AG-360x023....................................................................Fuse - 600V. 1Amp
A-47L................................................................................Energizer
ADP-46.............................................................................Ground adaptor
912....................................................................................Buttery AAA
VRC-320...........................................................................Alligator Clip
Reg. U.S. Pat. office
Patent nos. 2,663,845
Others Pending
HOW TO INSTALL
FUSE AND BATTERY
Unscrewbaseofohmmeterbattery/fuse attachment
insert fuse (Use Litte/fuse type 8AG - 360x023
1AMPfast blow) and AAAbattery (Cal No 912, not
supplied) into probe end as shown in figure.
Screw base on to probe.
HOW TO USE AS AN OHMMETER
CAUTION:
FOR RS-3 MODELS
.
Make certain no voltage is present in circuit before connecting ohmmeter.
The ohmmeter is fused to help protect it against a misapplication of voltage
but under certain conditions it is still possible to damage the meter and/or
cause personal injury. Use only OHB-3HE ohmmeter attachment with fuse
#8AG-360x023. 1 Amp 600V.
Fig 13
Fuse
Battery
Case
Fuse
Battery
Lid
1. Insert either the Red or Black Voltage
Lead into the Left Voltage Receptacle
at bottom of instrument case (Fig. 14).
2. Insert ohmmeter battery/fuse attachment
into the jack on the right side of the
instrument just below the ohmmeter Zero
Adjust Knob. Seat plug to bottom for
good connection (Fig. 15).
3. Set range Selector so that the 150 volt
red scale appears in window.
4. Ohmmeter Scale Adjustment with test
Leads Open-Pointer should line up with
division marked “
∞
” on OHMS SCALE.
Turn Pointer Zero Adjust Screw if neces-
sary (Fig. 16).
IMPORTANT:
Read "Precaution for Personal and Instrument Safety"
before using instrument.
Fig 14
Fig 15
Fig 16
Zero
Adjust
Knob
Zero
Adjust
Knob
Fig 17
Fig 18
Fig 19
Zero
Adjust
Knob
NOTE: If you fail to get an ohmmeter indication or the indication is
intermittent, before replacing the battery or fuse, lightly sand the base
of the battery with fine sandpaper. This will remove any oxidation that
could be causing poor or intermittent contact.
CAUTION: Makecertainthatcircuit
is disconnected from line before
takinganyresistance measurements.
P/N 915741 Rev.B
OPERATING
INSTRUCTIONS
for
AMPROBE
®
Rotary Scale
Clamp-on
Model RS-3
See Precautions for Personal and
Instrument Safety on Page 1
SPECIFICATIONS
AC Voltage Ranges: 0- 150/300/600
AC Amp Ranges: 0-6/15/40/100/300
Ohms : 25 Ohms mid-scale
Frequency Response: 50/60 Hz
Accuracy: Volts and Amps: – ± 3% of Full Scale 50 / 60 Hz
based on sinusoidal waveform
Ohms – ±3% of arc.
Duty: Continuous
Case Breakdown: 3500 Volts
Ohmmeter Protection: Ohm circuit is fuse protected to 600 Volts
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