Hand-held Digital Insulaon Resistance
Tester User Manual
1. Overview
This series of meters are high performance hand-held digital
insulaon resistance testers. It has a safe structural design and a new
electronic circuit design with more complete funcons, higher
accuracy, and more convenient and reliable operaon. It is
shock-proof, dust-proof, moisture-proof, and is suitable for outdoor
use. A selecon of output test voltages from 100V/250V/500V/
1000V/2500V/5000V are available on dierent models, and the
highest insulaon resistance measurement range can reach up to
200. AC voltages can also be measured.
This product is suitable for measuring insulaon resistance of various
types of electrical equipment and insulaon materials such as
transformers, motors, cables, switches, and electrical appliances. It
can also be used for maintenance, tesng, and vericaon purposes
for various types of electrical equipment.
This series of meters are your ideal electrical tesng instruments.
2. Safety Rules
(1) Please read this user manual carefully before using;
(2) The design of this meter complies with the IEC-1010 double
insulaon, “polluon degree 2”, and Overvoltage Category II
safety standards, published by the Internaonal Electrotechnical
Commission (IEC);
(3) Using the device when the back cover has not been closed
properly is strictly prohibited due to risk of electric shock;
(4) Before using, check the insulaon of the test probes to make
sure they are not damaged;
(5) Do not turn the= funcon selecon switch while conducng
measurements;
(6) When “ ” is displayed on the LCD screen, the baery should
be replaced or recharged in a mely manner to ensure
measurement accuracy.
3. Electrical Symbols
Warning
Double Insulaon
High Voltage Danger Low Baery
V
～
AC Voltage Ground Symbol
4. Features
(1) Low power consumpon and highly integrated chip design, with
automa zero calibraon, automa polarity display, and
over-range indicaon funcons.
(2) LCD display: 3 1/2 digit large screen display, highest readout
value of “1999”.
(3) Data hold and funcon symbol display funconality.
(4) LCD display with backlight.
(5) Rotary switch which can be used to select dierent levels when
measuring voltages.
(6) Able to measure AC voltages
below 750V.
(7) LED indicator for high voltage operaon mode.
(8) Low baery indicator.
(9) Baery powered, no need for hand cranking.
(10) Please select a valid range before tesng. Use the rotary switch
to select a suitable range.
(11) Strong load capacity with approximately 1mA short-circuit
output current.
(12) Complete protecon circuit, able to eecvely prevent damage
from induced voltages.
(13) LCD display size: 68×55mm (35mm cha
racter height).
(14) Power source: 6 x 1.5V AA baeries (R6AA SUM-3)
(6688B, 6688C, 6688F);
9.6V Ni-MH rechargeable baery (6688BR, 6688CR, 6688FR).
(15) Outer dimensions: 218×122×75mm.
(16) Weight: About 900g (including baeries).
(17) Operang condions;
Operang temperature: 0 - 40℃, relave humidity <80%;
Storage temperature: -10 - 50℃, relave humidity <85%;
Temperature range for guaranteed accuracy: 23±5℃, relave
humidity <75%.
5. Technical Speciaons
Accuracy: ±(% x readout value + digits), 1 year warranty.
O
perang temperature: 23±5°C, relave humidity <75%.
Product
Model
6688B/
6688BR
6688F/
6688FR
6688C/
6688CR
Maximum
output voltage
5000V 2500V 1000V
Measurement
voltage output
range
500V/1000V/
2500V/5000V
250V/500V/
1000V/2500V
100V/250V/
500V/1000V
Output
voltage
90%-110% of rated test voltage
Measurement
range
1M-200G 1M-20G
1M-20G
Measurement
accuracy
1M-200M: ± (3% × readout value + 5 to the
digit in the smallest decimal place)
200M-10: ± (5% × readout value + 5 to the
digit in the smallest decimal place)
10G-200G: ± (10% x readout value + 5 to the
digit in the smallest decimal place)
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