2
HIOKI's
new technology
enhances voltage measurement safety
Development of the SAFETY HiTESTER 3258 opens the door to a new realm of safety by accurately
measuring non-destructively through wire insulation, a particular safety concern to those who maintain and
inspect electrical facilities
Safe Probe Heads
True RMS values on large, crystal-clear display
Data Hold Indicator
Shows when data is being held
(HOLD button pressed)
APS Indicator (Auto Power Shutoff)
The HiTESTER automatically shuts off when 10
minutes have elapsed from the last operation (can
be disabled)
AC Indicator
Low Battery Indicator
Reliably safe, non-metallic resin heads
Measured Value
Voltage Unit
Indicator
True RMS values retain accuracy despite waveform distortion
Voltage Detector
Power Button
Safety Barrier
Easy operation and informative display
1. Hot line check
The HOLD lamp flashes when an energized line (at least 30 V AC) is detected.
Applicable electric cable types
Size: 38 mm
2
or larger insulated electric line
(100 mm
2
or larger recommended)
Actual-size cross sections
Hot Line
Indicator
2. Measured value
When the display has stabilized, the HOLD lamp lights and the measured value is
displayed.
Measured
Value
38 mm
2
(11.5 mm dia.) insulated cable
3. Hold measured value
Press the HOLD button to temporarily freeze the displayed value.
Lamp turns off
100 mm
2
(17 mm dia.) insulated cable
Measurement
Hold
3
■
Ensures safe measurements in the cubicle
Point 1
Point 2
Easily measure right through cable insulation Safely measure around busbars
Also safe for metallic conductors
Actual size
Long grip for better safety
Safely measure 380-480 V AC lines
■
Get accurate measurements easily
The HiTESTER measures the voltage between two probes. To ensure accurate measurements, apply the
voltage detector probes perpendicular to the object to be measured.
To measure voltage to ground, apply one probe to a ground conductor.
Apply each voltage detector probe perpendicular to
the object to be measured.
Correct measurement method
Conductor
Conductor
Conductor
✕
Incorrect measurement
Conductor
✕
Conductor
4
Measurements with traditional non-metallic-contact voltmeters and phase detectors
depend on the coupling capacitance (C
1
and C
2
) between voltage detector electrodes in
the probe tips and the measurement objects. That voltage detection method can present
problems due to the dependence of the coupling capacitance on the material properties
of the measurement objects, making accurate voltage determination (Vm = Vm
2
- Vm
1
)
problematic.
The
SAFETY HiTESTER 3258
employs a new technological principle to detect
accurate measurement voltage (Vm) independent of coupling capacitance.
❏
HiTESTER 3258 measurement principle
■
Model 3258 Specifications
(accuracy guaranteed for one year at 23 ±5°C and 80% RH or less)
Measurement parameter
Measurement objects
Measurement values
Max. rated voltage to earth
Circuit dynamics
Temp. characteristics
Effect of conductor diameter
Effect of nearby conductors
Effect of external magnetic field
Display
Display refresh rate
Display response time
Functions
Operating temp. & humidity
Storage temp. & humidity
Operating environment
Applicable standards
Power source
Max. rated power
Size and weight
AC voltage (AC potential bridge)
Insulated electric lines (Indoor PVC or equivalent, 100 mm2 or larger),
metal conductors
Note: Not suitable for shielded cables
True RMS display
600 Vrms AC
Crest factor 1.8 (sine wave only at 600 V range)
0.05% rdg./°C
0.5% rdg. (add to measurement accuracy for 38 to 100 mm
2
insulated cables)
±5% rdg. or less
none
4200 counts, with less than 10 counts zero-suppressed
Approx. once every 0.6 seconds
2.4 s or less
Data Hold, Auto Power Shutoff, Low-Battery Warning
0 to 40°C, 80% RH or less, non-condensating
Indoors, up to 2000 m ASL
-10 to 50°C, 80% RH or less, non-condensating
Safety: EN61010, EMC: EN61326
Six AA (LR6) alkaline batteries
Max. operating time: approx. 14 h (power on, no input),
or the equivalent of 1000 one-minute operations or 200 five-minute operations
2 VA
51W(2.01") × 275H(10.83") × 37.5D(1.48") mm (per probe),
Cable length: 900 mm (35.43"), 670 g (23.6 oz.) (including batteries)
AC Voltage Measurement Accuracy (on insulated PVC cables or equivalent, 100 mm
2
or larger)
Ranges
(auto-ranging)
420.0 V
600 V
Displayable
range
0.0 to 420.0 V
380 to 600 V
Display
resolution
0.1 V
1V
Range of guaranteed
accuracy
30.0 to 420.0 V
380 to 480 V
481 to 600 V
Accuracy
40 to 66 Hz
66 to 400 Hz
±1.5% rdg. ±5 dgt. ±2.5% rdg. ±5 dgt.
±2.0% rdg. ±5 dgt.
±5.0% rdg. ±5 dgt.
SAFETY HiTESTER 3258
Supplied Accessories: One manual, one soft case and six AA (LR6) batteries
1608-1610 Shanghai Times Square Office, 93 Huai Hai Zhong
Road, Shanghai, P.R.China POSTCODE: 200021
TEL +86-21-6391-0090/0092 FAX +86-21-6391-0360
E-mail: info-sh@hioki.com.cn
Supplied Accessory: soft case
DISTRIBUTED BY
HIOKI (Shanghai) Sales & Trading Co., Ltd. :
HEAD OFFICE :
81 Koizumi, Ueda, Nagano, 386-1192, Japan
TEL +81-268-28-0562 / FAX +81-268-28-0568
E-mail: os-com@hioki.co.jp
HIOKI USA CORPORATION :
6 Corporate Drive, Cranbury, NJ 08512 USA
TEL +1-609-409-9109 / FAX +1-609-409-9108
E-mail: hioki@hiokiusa.com
Beijing Office :
A-2602 Freetown, 58 Dong San Huan Nan Road
Beijing, P.R.China POSTCODE: 100022
TEL +86-10-5867-4080/4081 FAX +86-10-5867-4090
E-mail: info-bj@hioki.com.cn
Guangzhou Office :
Room A-3206, Victory PlazaServices Center, No.103,
Tiyuxi Road, Guangzhou, P.R.China POSTCODE:510620
TEL +86-20-38392673/2676 FAX +86-20-38392679
E-mail: info-gz@hioki.com.cn
3258E2-91M-05P
Printed in Japan
All information correct as of Jan. 16, 2009. All specifications are subject to change without notice.
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