the test leads from the circuit under test, then
remove the test leads from the instrument.
5-3) Resistance Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all safety precautions in sec. 2.
CAUTION
Resistance measurements must be made on de-energized
(dead) circuits only. Impressing a voltage across the instrument
terminals while set to any resistance range may result in electric
shock, instrument damage and/or damage to equipment under
test. Be certain equipment is completely de-energized.
3. Completely de-energize the circuit or device
which is to be measured. Set the selector switch
to the range desired. Hold the test lead tips
together and adjust for a “0” ohm reading using
the “0
Ω
adj” knob. If a zero reading cannot be
obtained, a weak battery is the most probable
cause. See section 6.1 (Battery Replacement).
4. Connect the instrument to the points between
which the resistance is to be measured. Read the
resistance on the uppermost “OHMS” scale.
Multiply the reading by the range the selector
switch is set to. For example a reading of 10 on
the “x1K” range equals 10K ohm (1K = 1000
Ω
).
NOTE:
When reading resistors in circuit, there may exist
more than one conductive path. When this condition exists,
the reading taken is a combination of the circuit paths.
When trying to read one resistor, it is advisable to remove
that resistor from the circuit before measurement to avoid
reading multiply conductive paths.
9
8. Battery Test Function
9. Handy Tiltstand/ Carry Handle
10. Perfect for the Homeowner, Hobbyist and
Professional
3-3) Specifications
Sensitivity:
20K
Ω
/VDC, 9K
Ω
/VAC
Accuracy:
DC ± 3% Full Scale
AC ± 4% Full Scale
Ω
± 3% Arc Length
Fuse:
One (1) 1/2 Amp. 250V, 1/4" X 11/4",
A.W. SPERRY Part #F-1
Power Source:
Two (1) 1.5V AA size batteries
A.W. SPERRY part No. B-1
Size:
5.4"H x 3.7"W x 1.8"D
(137 x 95 x 45mm)
Weight:
9.5 oz. (270 g)
Ranges and Accuracy
DC Voltage:
0-2.5/10/50/250/1000 Vdc
AC Voltage:
0-10/50/250/1000 Vac
DC Current:
0-5m/50m/500mA/20Adc
Resistance:
0-10K/100K/10M
Ω
(50/500/50K
Ω
Mid-Scale)
Battery:
1.5V/9Vdc
Continuity Buzzer
Decibels:
-8 to +62dB
3-4) Packaging
Comes complete with one set TL-56 Test Leads, two B-1
“AA” type Batteries (installed in the instrument), one F-1
Fuse (Installed) and Form #245 Operating Instructions.
4
