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The following symbols in this manual indicate the relative
importance of cautions and warnings.
4. Replacement Procedure
5. Specifications
8951
VOLTAGE / CURRENT UNIT
INSTRUCTION MANUAL
September 2006 Revised edition 5 Printed in Japan
1. Introduction
Thank you for purchasing the HIOKI "8951 VOLTAGE /
CURRENT UNIT". To obtain maximum performance from the
device, please read this manual first, and keep it handy for
future reference.
The 8951 is the voltage / current unit for the MEMORY
HiCORDERs. Always install this device on a Memory
HiCORDER for use. For the detailed installation procedure,
refer to Main unit manual.
The device can be used with 8855 MEMORY HiCORDERs
equipped with ROM Ver. 1.10 or later.
Follow carefully the advice of "3. Notes on Use."
2. Safety Notes
This device is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior
to shipment. However, mishandling during use could result
in injury or death, as well as damage to the device. Be
certain that you understand the instructions and
precautions in the manual before use. We disclaim any
responsibility for accidents or injuries not resulting directly
from device defects.
Safety symbol
This manual contains information and warnings essential for safe
operation of the device and for maintaining it in safe operating
condition. Before using the device, be sure to carefully read the
following safety notes.
The symbol printed on the device indicates that
the user should refer to a corresponding topic in
the manual (marked with the symbol) before
using the relevant function.
In the manual, the symbol indicates particularly
important information that the user should read
before using the device.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates both DC (Direct Current) and AC
(Alternating Current).
8951A981-05 06-09H
DANGER
Indicates that incorrect operation presents an
DANGER
WARNING
CAUTION
extreme hazard that could result in serious injury
or death to the user.
Indicates that incorrect operation presents a
significant hazard that could result in serious
injury or death to the user.
Indicates that incorrect operation presents a
possibility of injury to the user or damage to the
device.
3.NotesonUse
DANGER
The maximum rated voltage to earth (voltage between
8951 input terminal and main unit frame, and between
input terminals of other input modules) is 30 V rms or 60
V DC. To avoid the risk of electric shock and damage to
the device, take care that voltage between 8951 input
terminal and main unit frame, and between input
terminals of other input modules does not exceed these
ratings.
The maximum input voltage is 30 V rms or 60V DC.
Attempting to measure voltage in excess of the
maximum input could destroy the device and result in
personal injury or death.
When using a clamp-on sensor, clamp-on probe, or
universal clamp-on CT, the 8951 input terminal (L) is
common with the ground side of the +/-12 V power
supply of other mounted input modules. To avoid risk of
electric shock and possible damage to the device or the
sample being tested, be sure to make the connections
correctly.
Before using the device, make sure that the sheathing on
the input cables and thermocouples is not damaged and
that no bare wire is exposed. If there is damage, using
the device could cause electric shock. Replace with the
specified by hioki.
CAUTION
For safety reasons, only use the specified 9198
CONNECTION CORD for measurement.
To clean the device, wipe it gently with a soft cloth moistened
with water or mild detergent. Never use solvents such as
benzene, alcohol, acetone, ether, ketones, thinners or
gasoline, as they can deform and discolor the case.
Main unit
GND
8951
VOLTAGE /
CURRENT UNIT
H
L
30 V rms or 60 V DC
WARNING
To avoid electric shock accident, before removing or
replacing an input module, confirm that the device is
turned off and that the all input cords, thermocouples,
and power cord are disconnected.
The mounting screws must be firmly tightened or the
input module may not perform to specifications, or may
even fail.
This section describes how to replace the 8951 VOLTAGE /
CURRENT UNIT.
The following procedure describes how to remove the input
module.
Install the devices by reversing the procedure for removal.
1. Remove the connector cables from all input modules.
2. Power off the main unit, and disconnect the power cord.
3. Remove the two fixing screws with a Phillips screwdriver, as
shown in the figure below.
4. Grasp the handle and pull the device out.
WARNING
To avoid the danger of electric shock, never operate the
device with an input module removed. To use the device
after removing an input module, install a blank panel over
the opening of the removed module.
CAUTION
Do not measure with a blank panel removed. Otherwise, the
device internal temperature becomes unstable and consequently
the specifications are not met.
Accuracy at 23 5 , 30% to 80% RH after zero adjustment
after 30-minutes warming-up time. Accuracy guaranteed for 1
year.
General specification
/D resolution 12 bit
Measurement function Voltage measurement,
Maximum sampling
peed
Low-pass filter Voltage, 3273, 3273-50, 3274, 3275,
Input coupling Voltage, 3273, 3273-50, 3274, 3275,
Maximum input
oltage
Input, connection
erminals
: BNC terminal
: Sensor connector
(for 9270s)
: Power connector
(for 3273*1, 3273-50*1,
3274*1, 3275*1, 3276*1)
Operational ranges for
emperature and
humidity
Operating
Environment
emperature and
humidity ranges for
torage
Dimensions Approx. 107.4 W x 28 H x 164.5 D mm
Mass Approx. 190 g (6.7 oz.)
ccessory Instruction manual
Option 9318 CONVERSION CABLE (to connect
Correspondence
current sensor and
probe
Current measurement
20 MS/s
3276: OFF, 5, 500, 100 k, 1 MHz 50%
-3 dB
9270, 9271, 9272: OFF, 500 Hz 50%
-3 dB
9277, 9278: OFF, 5, 500, 100 kHz 50%
-3 dB
9279 : OFF, 5, 500 Hz 50% -3 dB
3276, 9277, 9278, 9279: DC, GND, AC
9270, 9271, 9272: GND, AC
30 V rms or 60 V DC
Input resistance: 1 MΩ 1%
Input capacitance: 50 pF 10 pF
(at 100 kHz)
Input type: Unbalanced
(Voltage measurement,
current measurement
(When using the 3273*1, 3273-50*1,
3274*1, 3275*1, or 3276*1))
Maximum rated voltage to earth:
30 V rms or 60 V DC
(When using the clamp, shares common
ground with the 12 V terminals of other
mounted input modules.)
Power supply*: 12 V 8%
GND: Shares common ground with the
12 V terminals of other mounted input
modules.
Power supply*: 12 V 8%
GND: Shares common ground with the
12 V terminals of other mounted input
modules.
Note: When using the 3273*1, 3273-50*1,
3274*1, 3275*1, or 3276*1, the BNC
terminal serves as the power supply
connector.
Same as the MEMORY HiCORDER in
which the 8951 is installed
Same as the MEMORY HiCORDER in
which the 8951 is installed
Temperature:
-10 to 50 (14 to 122 )
Relative humidity: 80% RH maximum
(with no condensation)
Approx. 4.23" W x 1.10" H x 6.48" D
the clamp on sensor)
Clamp on sensor:
9270, 9271, 9272, 9277, 9278, 9279
Clamp on probe:
3273*1, 3273-50*1, 3274*1, 3275*1, 3276*1,
Standard Applying
2
Safety
Effect of radiated
radio-frequency
electromagnetic field
Voltage, Current Measurement
1. Voltage
Measurement range 1m,2m,5m,10m,20m,50m,100m,
. Current
Measurement range When using the 9270, 9272 (20 A), 9277,
3. Common
specification
Frequency
characteristic
DC amplitude
accuracy
Zero position
accuracy
Temperature
characteristic
Common mode
rejection ratio
Noise Voltage measurement:
*1: Safety restrictions apply. (See 7 and 8.)
*2: The resolution of the vertical scale is 80 LSB/DIV.
*3: When measuring current, accuracy and characteristics of the
sensor or probe are added.
*4: When using the 9279
DC amplitude accuracy 0.625%f.s.
Zero position accuracy 0.20%f.s.
*5: When using the 3275
*3*4
*3*4
EN 61010
Pollution Degree 2, Measurement category I
(anticipated transient overvoltage 330 V)
EMC
EN 61326, ClassA
15% f.s. at 3V/m
200 m, 500 m, 1, 2, 5 V/DIV
3273*1, 3273-50*1, and 3276
10 m, 20 m, 50 m, 100 m, 200 m, 500
m, 1, 2, 5 A/DIV
When using the 9271, 9272 (200 A),
9278, 3274*1, and 3275
100 m, 200 m, 500 m, 1, 2, 5, 10, 20,
50, 100*5A/DIV
When using the 9279
200 m*2, 500 m, 1*2,2*2,5,10*2,20*2, 50,
100*2A/DIV
DC to 4 MHz 3 dB (DC coupling) (When
using a sensor, the sensor
characteristics are also added.)
7Hzto4MHz 3 dB (AC coupling)
(When using a sensor, the sensor
characteristics are also added.)
0.5% f.s. (filter 5 Hz ON, averaging)
0.15% f.s. (filter 5 Hz ON, averaging,
after zero adjustment)
*3
Gain: 0.025%f.s./
Zero position: 0.045%f.s./ (f.s. = low
sensitivity range of more
than 100 mV)
sensitivity range of more
than 50 mV)
80 dB minimum (at 50/60 Hz and with
signal source resistance 100 Ω maximum)
500 µVp-p max., 300 µVp-p (typ) (in the
1 mV/DIV range)
Current measurement:
5 mAp-p max. +7.1 mAp-p max. (3273)
(in the 10 mA/DIV range when using the
3273)
*1
0.05%f.s./ (f.s. = high
6. Clamp Connection Procedure
9270, 9271, 9272, 9277, 9278, 9279
9318
*1
9270s
3273, 3273-50, 3274, 3275, 3276
Power plug
Terrminator
7. Precautions when using the 3273,
3273-50, 3276
DANGER
When conductors being measured carry in excess of the
safe voltage level (SELV-E)*
prevent short circuits and electric shock while the core
section is open, make sure that conductors to be
measured are insulated with material conforming to (1)
Measurement Category (Overvoltage Category) I
Double (reinforced) Insulation Requirements for Working
Voltages of 300 V, and (3) Pollution Degree 2. For
safeties sake, never use this sensor on bare conductors.
The core and shield case are not insulated.
Be careful to avoid damaging the insulation surface
while taking measurements.
Refer to the following standards regarding the meanings
of underlined terms.
IEC 61010-1
IEC 61010-2-032
*: The voltage levels are 30 V rms and 42.4 V peak or 60 V DC.
and not more than 300 V, to
,(2)
8. Precautions when using the 3274,
3275
DANGER
When conductors being measured carry in excess of the
safe voltage level (SELV-E)*
(CAT II) or 300 V (CAT III), to prevent short circuits and
electric shock while the core section is open, make sure
that the conductor insulation satisfies the (1) Basic
insulation requirements for the applicable (2)
Measurement Categories (Overvoltage Categories)
Working Voltage
sake, never use this sensor on bare conductors.
Be careful to avoid damaging the insulation surface
while taking measurements.
Refer to the following standards regarding the meanings
of underlined terms.
IEC 61010-1
IEC 61010-2-032
*: The voltage levels are 30 V rms and 42.4 V peak or 60 V DC.
, and (4) Pollution Degree. For safeties
and not more than 600 V
,(3)
9. Number of Usable Clamps
The number of clamps that can be used with the 8855 is limited
according to clamp type. The clamps that can be used for the
relevant clamp type is shown to the list shown below.
In the case that the relevant clamp type is used the clamp total
use number is confirmed and please do not exceed the number of
the list shown below.
Clamp Number
3274 CLAMP ON PROBE Continuous 150 A
Non-continuous 300 A
3275 CLAMP ON PROBE 4
3273-50, 3276 CLAMP ON PROBE 4
9278 UNIVERSAL CLAMP ON CT 7
9279 UNIVERSAL CLAMP ON CT 7
Measurement categories (Overvoltage categories)
This device complies with CAT I safety requirements.
To ensure safe operation of measurement instruments, IEC 61010
establishes safety standards for various electrical environments,
categorized as CAT I to CAT IV, and called measurement
categories. These are defined as follows.
CAT I : Secondary electrical circuits connected to an AC
electrical outlet through a transformer or similar
instrument.
CAT II : Primary electrical circuits in equipment connected to an
AC electrical outlet by a power cord (portable tools,
household appliances, etc.)
CAT III : Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel,
and feeders from the distribution panel to outlets.
CAT IV : The circuit from the service drop to the service entrance,
and to the power meter and primary overcurrent
protection instrument (distribution panel).
Higher-numbered categories correspond to electrical environments
with greater momentary energy. So a measurement instrument
designed for CAT III environments can endure greater momentary
energy than a instrument designed for CAT II.
Using a measurement instrument in an environment designated
with a higher-numbered category than that for which the
instrument is rated could result in a severe accident, and must be
carefully avoided.
Never use a CAT I measuring instrument in CAT II, III, or IV
environments.
The measurement categories comply with the Overvoltage
Categories of the IEC60664 Standards.
8
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