VT1005
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HIOKI VT1005A961-00
AC/DC HIGH VOLTAGE DIVIDER
Instruction Manual
Oct. 2022 Edition 1
VT1005A961- 00 22-10H
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary Markings
will be repaired free of charge. This warranty is valid for a period of three (3)
years from the date of purchase. Please contact the distributor from which
you purchased the product for further information on warranty provisions.
Introduction
Thank you for choosing the Hioki VT1005 AC/DC High Voltage Divider.
To ensure your ability to get the most out of this device over the long term,
please read this manual carefully and keep it available for future reference.
Please review the separate “Operating Precautions” before using the
device.
The latest edition of the instruction manual
The contents of this manual are subject to change, for
example as a result of product improvements or changes
to specications.
The latest edition can be downloaded from Hioki’s
website.
https://www.hioki.com/global/support/download/
Overview
The VT1005 is an AC/DC voltage divider that converts an input voltage of
up to 5 kV (no measurement category) into a one-thousandth for output with
high accuracy.
The device has good atness in frequency characteristics and stable
temperature characteristics. It can be used not only for voltage
measurement but also for high-precision power measurement by combining
it with a wattmeter.
[600631220]
EN
Precautions for Use
Be sure to follow the precautions listed below in order to use the device
safely and in a manner that allows it to function eectively.
DANGER
Never touch the metal areas at the tips of voltage
cords during measurement.
Doing so could cause serious bodily injury or a short- circuit.
Do not use the device to measure circuits that exceed
its ratings or specications.
Doing so could cause damage to the device or overheating,
resulting in serious bodily injury.
WARNING
Do not use any cables whose insulation is damaged or
whose metal portion is exposed.
Doing so could cause serious bodily injury.
Do not touch the voltage cords after turning on the line
under measurement.
Do not disconnect the voltage cords from the device
while the voltage cords are connected to the line under
measurement.
Failure to do so could cause bodily injury.
If you notice smoke, an unusual sound, or a strange
odor, immediately turn o the device and the line
under measurement, unplug the power cord from the
outlet, and disconnect the wiring.
Failure to do so could cause serious bodily injury or re.
Turn o the line under measurement before connecting
the voltage cords.
Failure to do so could cause bodily injury.
When using the device, use only Hioki-specied
voltage cords and power cord.
Using a cord other than those specied could result in bodily injury
or a short-circuit.
CAUTION
Do not bend, pull on, or twist cords, including where
they connect, with excessive force.
Doing so could cause the cords to break.
Do not step on cords or allow them to become caught
between other objects.
Doing so may damage insulation, resulting in bodily injury.
Do not bend cords at temperatures of 0°C or lower. Do
not pull on cables.
The cords are hardened. Doing so could damage the insulation or
cause a wire break, resulting in an electric shock.
Do not input a voltage to input terminals while the
device has been turned o.
Doing so could cause damage to the device.
Securely connect the included power cord to the
device and a grounded-type power outlet before
measurement.
Failure to ground the device with the power cord could cause the
operator to experience an electric shock.
When disconnecting cords, disengage the lock and
then pull out the connector while gripping it at the
connection (do not pull on the cord).
Doing so could damage the connector or junction.
Use the L9217 Connection Cord (which is made of
resin) with insulated BNC connectors.
Connecting a metal BNC cable to an insulated BNC connector
could damage the insulated BNC connector or connected
equipment.
• The device is not designed to insulate an measuring instrument electrically
from lines under measurement.
• The device is classied as a Class A device under the EN 61326 standard.
Use of the device in a residential setting such as a neighborhood could
interfere with reception of radio and television broadcasts.
If you encounter this issue, take steps as appropriate to address it.
• If the device seems to be malfunctioning, contact your authorized Hioki
distributor or reseller.
Parts Names
Front
11 22
Voltage input terminal
11
(positive)
Voltage input terminal
22
(negative)
Back
Connect the L1050 Voltage Cord (red)
here.
Connect the L1050 Voltage Cord (black)
here.
44
33
77
55
88
66
POWER indicator
33
(power supply)
OVER indicator
44
(excessive input)
Power switch Can be used to turn the device on and o.
55
Power inlet Connect the accompanying power cord
66
BNC output connector Connect the L9217 Connection Cord
77
Functional grounding
88
terminal
Serial number The serial number consists of nine digits.
99
Indicates the power status.
Light o: the device is o.
Green light: the device is on.
Indicates the input status.
Light o: within the input range
Red light: out of the input range
: on, : o)
(
here.
(insulated BNC cable) here.
In locations with excessive noise,
connecting the functional grounding
terminal of this device to that of a power
analyzer may enhance noise immunity.
The rst two digits indicate the year of
manufacture, while the second two digits
indicate the month of manufacture.
Do not remove this sticker as the number
is important.
99
Measurement Method
Prepare for measurement.
1
Crimp solderless terminals to the L1050 Voltage Cord to connect it
to a line to be measured.
Connect the power cord.
2
Make sure that the device’s power switch is set to the OFF
1.
position.
Connect the accompanying power cord to the power inlet of the
2.
device.
Connect the voltage cords.
3
Connect the L1050 Voltage Cord (black, red) to each voltage
1.
input terminal while aligning the protrusions with the grooves of
the voltage input terminal.
Turn the connector clockwise to lock it (until points to ).
2.
Before removing it, turn the connector counterclockwise to
unlock it (until points to
3
Connect the BNC cable.
4
Connect the L9217 Connection Cord (insulated BNC) to the
1.
BNC connector of the device.
Attach the 9704 Conversion Adapter to the L9217 cable, and
2.
then connect the Conversion Adapter to the Power Analyzer’s
voltage input terminals.
The Conversion Adapter has a polarity. Connect the 9704’s red
terminal to the U voltage input terminal and the black one to the
voltage input terminal.
±
Use the power switch to turn the device on.
5
Make sure that the POWER indicator lights green.
The device may malfunction if the indicator does not light green
even when the switch has been set to ON. If you encounter this
issue, unplug the power cord not to allow the device to be used.
Make connections to a line to be measured.
6
Shut o the power supplied to the line to be measured and exercise
safety precautions when making connections.
Make connections referring to the connection screen of the Power
Analyzer.
Line A
Line B
Line C
±
I
Connection example (3P3W3M)
Congure the Power Analyzer settings.
7
Please refer to the "Power Analyzer Setup Guide" provided with the
device for conguring the PW8001, PW6001, or PW3390 Power
Analyzer settings.
Perform measurement.
8
Turn on the line under measurement and conrm that the
1.
measured values displayed on the Power Analyzer are within
the rated range.
Make sure that the device’s OVER indicator (excessive input)
2.
does not light red. Shut o the power supplied to the line under
measurement when the indicator lights red.
).
Black
-2
3
-1
Red
VT1005VT1005VT1005
UUU
−+−+−+
±±
II
Specications
Accuracy labeling
Reading (display value)
Indicates the value displayed by the instrument. Limit values for reading
errors are expressed as a percentage of the reading (“% of reading” or
“% rdg”).
Full scale (rated voltage)
Indicates the rated voltage. Limit values for full-scale errors are
expressed as a percentage of full scale (“% of full scale” or “% f.s.”).
Operating
10000
Maximum voltage (V)
Frequency (Hz)
HIOKI VT1005A961-00
environment
Operating
temperature and
humidity range
Storage
temperature and
humidity range
Dust resistance
and water
resistance
The protection rating for the enclosure of this device (based on EN60529) is *IP20.
*IP20
This indicates the degree of protection provided by the enclosure of the device for
use in hazardous locations, entr y of solid foreign objec ts, and the ingress of water.
2: Protected against access to hazardous parts with ngers. The equipment inside
the enclosure is protected against entry by solid foreign objects larger than
12.5 mm in diameter.
0: The equipment inside the enclosure is not protected against the harmful eects of
water.
Standards Safety: EN 61010
Power supply Rated supply voltage: 100 V to 240 V AC
Indicator (power) When turned o: light o; when turned on: green light
Indicator
(excessive input)
Dimensions Approx. 195.0W
Weight Approx. 2.2 kg (77.6 oz.)
Produc t warranty
duration
Included
accessories
Options The options listed below are available for the device. To order
Dierential
maximum rated
voltage
Maximum rated
common-mode
voltage
Maximum rated
line-to-ground
voltage
Indoor use, pollution degree 2, altitude up to 2000 m (6562 ft.)
C to 50°C (14°F to 122°F)
−10
°
80% RH or less (non- condensing)
C to 60°C (−4°F to 140°F)
−20
°
80% RH or less (non- condensing)
IP20 (EN 6 0529)
EMC: EN 61326 Class A
(assuming voltage uctuation of
Rated power-supply frequency: 50 Hz, 6 0 Hz
Anticipated transient overvoltage: 250 0 V
Maximum rated power: 14 VA
Judgment is made based on the peak voltage between the
input terminals.
Within the range: light o, Out of the range: red light
83.2H × 346.0 D mm
×
(7.6 8 ″ W
3 years
• L1050-01 Voltage Cord (1.6 m)
• L9217 Connection Cord (insulated BNC, 1.6 m)
• 970 4 Conversion Adapter
• Power cord
• Instruction Manual (this document)
• Power Analyzer Setup Guide
• Operating Precautions (0990A903)
an option, please c ontact your authorized Hioki distributor or
reseller. Options are subject to change. Check Hioki’s website
for the latest information.
• L1050-01 Voltage Cord (1.6 m)
• L1050-03 Voltage Cord (3.0 m)
• L9217 Connection Cord (insulated BNC, 1.6 m)
• L9217-01 Connection Cord (insulated BNC, 3.0 m)
• L9217-02 Connection Cord (insulated BNC, 10 m)
• 970 4 Conversion Adapter
5000 V rms,
Provided this falls within the frequency derating curve
illustrated in Fig. 1.
5000 V rms,
Provided this falls within the frequency derating curve
illustrated in Fig. 1.
No measurement category:
Measurement category II:
Measurement category III:
3.28″ D × 13.6 2″H)
×
(insulated-female BNC-to-banana plug)
(insulated-female BNC-to-banana plug)
7100 V peak
±
7100 V peak
±
5000 V AC/DC,
Anticipated transient overvoltage: 0 V
2000 V AC/DC, anticipated transient overvoltage: 12000 V
1500 V AC/DC, anticipated transient overvoltage: 10000 V
7100 V peak
±
±
10%)
Denition of measurement categories
No measurement
category
(O)
Measurement
category II
(CAT I I)
Measurement
category III
(CAT III)
Voltage dividing
ratio
Maximum out put
voltage
Output resistance 50
Input resistance
(DC)
Applic able to the measurement of circuits that are not directly
connected to the main power supply.
EXAMPLE: Measurement on the secondary-side equipment
from the socket outlet of xed installation through
a transformer, etc.
Applic able to test and measuring circuits connected directly to
utilization points (socket outlets and similar points) of the lowvoltage mains installation.
Applic able to test and measuring circuits connected to
the distribution part of the building’s low-voltage mains
installation.
1000:1
Ω ±
10
±
12 V
Ω
(typical)
Ω
(typical)
Ω
Approx.
Between input ter minals: 52.8 M
Line-to-ground: 26.4 M
Input capacity
(100 kHz)
Frequency
atness
Accuracy
guarantee
conditions
Between input ter minals: 5.5 pF (typical)
Line-to-ground: 11 pF (typical)
Band where amplitude falls within
200 kHz (typical)
Band where phase falls within
500 kHz (typical, after phase delay corrected)
Accuracy guarantee duration: 1 year
Accuracy guarantee temperature and humidity range:
Warm-up time: 30 minutes or more
Sine- wave input, measuring instrument with an input
resistance of 1 M
voltage or less, common -mode input voltage of 0 V, no
external magnetic eld
C (73°F ±9°F), 80% RH or less (non-condensing)
23
°C ±5°
or more, dierential maximum rated
Ω
0.1% range:
±
0.1° range:
±
Measurement accuracy
Frequency
DC 0.03% + 0.05% –
DC < f < 30 Hz 0.2% + 0.1%
30 Hz ≤ f < 45 Hz 0.1% + 0 .1%
45 Hz ≤ f ≤ 66 Hz 0.02% + 0.02%
66 Hz < f ≤ 100 Hz 0.1% + 0.02%
100 Hz < f ≤ 1 kHz 0.1% + 0.02%
1 kHz < f ≤ 5 kHz 0.15% + 0.02%
5 kHz < f ≤ 50 kHz 0.15% + 0.02%
50 kHz < f ≤ 100 kHz 0.5% + 0.02%
100 kHz < f ≤ 30 0 kHz 1.5% + 0.5%
300 kHz < f ≤ 1 MHz 5.0% + 0.5%
Frequency band 4 MHz (−3 dB typical) –
• The unit of f in the accuracy formula is kiloher tz (kHz). Full scale corresponds to
5000 V.
• Phase accuracy values are merely designed values when the input has a frequency
other than 50 Hz and 60 Hz and a voltage exceeding 60 0 V.
• Amplitude and phase accuracy values are merely designed values when the input
frequency is within DC < f < 10 Hz.
• Amplitude and phase accuracy values are merely designed values when the input
has a frequency within 10 Hz ≤ f < 16 Hz and a voltage exceeding 220 V.
• Amplitude accuracy values are merely designed values when the input has a
frequency within 16 Hz ≤ f < 40 Hz and a voltage exceeding 1000 V.
• Amplitude accuracy values are merely designed values when the input has a
frequency within 2 kHz < f ≤ 10 kHz and a voltage exc eeding 3000 V.
• Amplitude accuracy values are merely designed values when the input has a
frequency within 10 kHz < f ≤ 30 kHz and a voltage exceeding 1000 V.
• Amplitude accuracy values are merely designed values when the input has a
frequency within 30 kHz < f ≤ 100 kHz and a voltage exceeding 750 V.
• Amplitude and phase accuracy values are merely designed values when the input
frequency is in 100 kHz < f ≤ 1 MHz and a voltage exceeding (22000 / f [kHz]) volts.
Output noise 300 µV rms or less
Common-mode
voltage rejection
ratio (CMRR)
Eects of
temperature
Eects of
conducted
radio-frequency
electromagnetic
eld
1000
100
10
DC
1 10 100 1 k 10 k 100 k 1 M 10 M
50 Hz/60 Hz: 90 dB (typical)
100 kHz: 80 dB (typical)
The maximum rated voltage is specied by the CMRR
when applied bet ween the voltage input terminals and the
enclosure.
Within the range of −10
Add
Add further
current.
0.2% of full scale or less at 10 V/m
±
20 ppm of reading per degree Celsius.
±
2 ppm of full scale per degree Celsius for direct
±
Amplitude
(% of reading + % of full scale)
C to 18°C or 28°C to 50°C
°
5000 V, 50 kHz
Phase
0.1
±
°
0.1
±
°
0.06
±
0.1 2
±
0.2
±
°
0.4
±
°
(0.08 × f)
±
(0.08 × f)
±
(0.08 × f)
±
(0.08 × f)
±
3500 V, 100 kHz
°
°
°
°
°
°
Fig. 1. Frequency derating curve
Combination Accuracy with Power
Analyzer
Combination accuracy with the PW8001, PW6001, PW3390 Power
Analyzers are as follows:
(power analyzer accuracy) + (divider accuracy)
Accuracy additions based on the various conditions of the Power Analyzer
and Voltage Divider specications also apply.
L1050 Voltage Cord
WARNING
Inspect the L1050 Voltage Cord before use, and if
you nd the sheath is damaged or internal sheath or
conductors are exposed, do not use the Voltage Cord.
Use of an abnormal Voltage Cord could cause an electric shock to
the operator. Replace it with a new one.
Do not damage the insulation when processing cables.
Doing so could cause serious bodily injury or a short- circuit.
The L1050 consist of a red cord and a black cord and each cord is cut o on
one side (half-stripped).
Crimp solderless terminals to the L1050 Voltage Cord according to the
circuit to be measured.
The sizes and dimensions of the L1050’s wires are as described below:
• Size: 22 AWG (0.326 mm
• Outer dimension: 5.2 mm
If you need to strip any insulation, use a wire stripper that supports 22 AWG
twisted wires.
Crimp solderless terminals compatible with the wire listed above.
Put heat-shrinkable tubes on crimped parts to secure the solderless
terminals to wires. Otherwise, the wires could be subjected to mechanical
stress, such as tensile, torsion, and bending stress, resulting in wire breaks.
Specications
Model L10 5 0 - 01 L10 5 0 - 03
Operating
environment
Operating
temperature and
humidity range
Storage
temperature and
humidity range
Terminal shape Banana plug-to-not terminated (half-stripped)
Cord length Approx. 1.6 m (63″)
Weight Approx. 55 g (1.9 oz.) Approx. 95 g (3.4 oz.)
Maximum rated
voltage
Maximum rated
current
Supported model VT1005 AC/DC High Voltage Divider
2
)
(including insulator)
Indoor use, pollution degree 2, altitude up to 2000 m (6562 ft.)
Connection cord
C to 100°C (14°F to 212°F)
−10
°
80% RH or less (non- condensing)
Banana plug
C to 50°C (14°F to 122°F)
−10
°
80% RH or less (non- condensing)
C to 60°C (−4°F to 140°F)
−20
°
80% RH or less (non- condensing)
(including banana plug)
5000 V AC/DC,
100 mA
7100 V peak
±
Approx. 3.0 m (118.1″)
(including banana plug)
Characteristics
Frequency characteristics (typical value)
2
0
−2
−4
Gain error (dB)
−6
Gain
Phase
−8
Phase (corrected)
−10
10 100 1 k 10 k 100 k 1 M 10 M
Frequency (Hz)
Frequency atness (typical value)
0.3
0.2
0.1
0
−0.1
Gain error (% rdg)
−0.2
Gain
Phase (corrected)
−0.3
10 100 1 k 10 k 100 k 1 M
Frequency (Hz)
Linearity (typical value)
2
1.5
1
0.5
0
−0.5
Error (% rdg)
−1
−1.5
−2
10 100 1000 10000
Input votage (V)
Dimensions
−2
−4
−6
−8
0.3
0.2
0.1
0
−0.1
−0.2
−0.3
+DC
−DC
60 Hz
Spec. (60 Hz)
4
2
0
Phase (°)
Phase error (°)
Unit: mm
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