3 Performing Measurements. Hioki DT4282, DT4281
Advertisement
Advertisement
3
Performing Measurements
3
Performing Measurements
3.1 Inspection Before Use
Before using the instrument the first time, verify that it operates normally to ensure that the no damage occurred during storage or shipping. If you find any damage, contact your authorized Hioki distributor or reseller.
Appearance check of the instrument and test leads
Check item
The instrument is neither damaged nor cracked.
The internal circuits are not exposed.
The terminals are not contaminated with debris.
The coating of the test leads is neither broken nor frayed, or the white portion or metal part within the lead is exposed.
Action
Visually check the instrument.
If it is damaged, there is a risk of electric shock. Do not use the instrument but send it for repair.
Remove contamination with a cotton swab.
If the test lead is damaged, there is a risk of electric shock. Do not use the instrument but send it for repair.
1
2
3
4
5
6
Check when turning on the power
(Set the rotary switch to any position other than OFF.)
Check item Action
The battery voltage is sufficient.
When the indicator appears in the top right corner of the display, the battery voltage is low. Replace the batteries as soon as possible.
7
33
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
Inspection Before Use
Check item
No indicators are missing.
Action
Display all indicators and ensure that no indicators are missing. (p. 74) If any of the indicators are missing, send the instrument for repair.
Operation check
This section introduces some of the operation checks. Periodical calibration is necessary in order to ensure that this instrument operates according to its specifications.
1 Check that the test leads are not broken.
Check method
Regarding the continuity check, deliberately short circuit the test
5
6
Action
Normal:
The value stabilizes at around 0.1 to 0.2 Ω .
Ω
7
Abnormal:
A numeric value other than the above appears.
Black
Red
Corrective action:
8
Replace with those specified by our company.
If the same phenomena persist even after the test leads are
9
Halt inspection and then send the instrument for repair.
1
2
3
4
5
6
7
8
9
10
34
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
Inspection Before Use
2 Measure samples (such as battery, commercial power supply, and resistor) of which values have already been known, and check that the appropriate values appear.
Check method
Example:
4
5 measurement to measure the
3
Action
6
Normal:
An already-known value appears.
(In this example, the commercial
7
Abnormal:
The measured value does not appear.
8
The malfunction may occur.
Stop the inspection and do not use the instrument.
9
1
2
3
4
Black
Red 5
3 Check that the fuse is not broken.
Check method
1. Remove the fuse from the instrument. (p. 106)
2. Reattach the battery cover.
3. In the resistance measurement, check the resistance of the fuse. (Resistance measurement
(p. 44))
Normal:
Fuse rating
630 mA
11 A
Action
Resistance
Approx. 1.2 Ω
0.1 Ω or less
Abnormal:
If the value above is not obtained (the value higher than that is displayed), replace the fuse. (p. 106)
35
6
7
2
1
3
4
5
6
7
8
9
10
Find Quality Products Online at: www.
GlobalTestSupply
.com
Inspection Before Use
Before measurements
WARNING
Observe the following to avoid short circuit accidents.
• Always verify the appropriate setting of the rotary switch before connecting the test leads.
• Disconnect the test leads from the measurement object before switching the rotary switch.
• Operate or connect the instrument by following the procedure of each measurement example (or procedure steps).
36
Find Quality Products Online at: www.
GlobalTestSupply
.com
Inspection Before Use
Auto power save function
• Before shipping (In the default setting), the auto power save function is set to enabled. If the instrument has not been operated for approx. 15 minutes, it enters the sleep mode. (When the instrument is in the sleep mode, press any key or turn the rotary switch to recover from the sleep mode.)
When the sleep mode continues for approx. 45 minutes, the power turns off automatically.
• To recover from the power off state, set the rotary switch to OFF and then turn on the power again.
• During current measurement, before setting the rotary switch to
OFF, disconnect the test leads. If the rotary switch is forcibly turned, the shutter may be damaged.
• If the instrument will be used for an extended period of time, disable the auto power save function. (p. 70)
• After use, set the rotary switch to OFF. The auto power save function consumes a small amount of current.
Numerical value display with no input
When the measurement terminal is open during DC voltage (DCV) measurement or AC voltage (ACV) measurement in the 60 mV range or
600 mV, a random value is displayed. This does not indicate a malfunction of the instrument. When the probe is connected to the measurement target, a normal numerical value is displayed. A high-input impedance voltmeter is used in the instrument for highly sensitive measurement. Consequently, external noise, such as inductive noise, appears as a numerical value.
1
2
3
4
5
6
7
37
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Voltage
1
2
3.2 Measuring Voltage
AC voltage, DC voltage, synthesized voltage of DC and AC, and voltage of AC and DC components can be measured. Furthermore, the maximum, minimum, and peak (instantaneous) values of measured values can be checked. (p. 61)
Before measurements
WARNING
If the instrument is used in locations where the rating indicated on the instrument or probes is exceeded, the instrument may be damaged resulting in personal injury. Do not use the instrument in such locations.
See “Measurement categories” (p. 9).
The autoranging function of this instrument automatically selects the optimum measurement range. To change the range arbitrarily, use the manual range. (p. 55)
4
5
6
Measuring AC voltage
3 7
1
3
Measure the AC voltage.
Measure the frequency simultaneously.
8
The measured value is a true RMS.
(p. Appx.1)
9
Red
38
Black
2
1
2
3
4
5
6
7
8
9
10
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Voltage
Measuring DC voltage
4 6
3
1
3
Measure the DC voltage.
7
1
3
2 8 2 2
114.1V
85.9V
100V
1
2
1
3
9
Red
Black
1
4
2
5
Measuring synthesized voltage of DC and AC
3
5
6
4 6
2 7
100V
±14.1V
COPY: MEAS̲ACV 1
Black
2
PEAK
Red
3
4
COPY: MEAS̲DCV 8 COPY: MEAS̲ DC+ACV
7
導通
9
DC and AC.
The measured value is a true RMS.
(p. Appx.1)
ダイオード
8
5
3
2
6
9 COPY: MEAS̲DC-ACV
4
1
7
コンダクタンス(S)
It is also possible to check the AC or DC components individually. (p. 40)
4
5
5
1
2
6
3
6
4
7
7
8
9
10
8
9
10
5
39
DC+AC の波形
114.1V
静電容量(C)
85.9V
100V
温度TEMP COPY: MEAS̲DCuA 交流電流ACA
6
7
8
9
10
DC 成分の波形
100V
AC 成分の波形
Find Quality Products Online at:
±14.1V
www.
GlobalTestSupply
.com
114.1V
85.9V
100V 100V
±14.1V
COPY: MEAS̲ACV
PEAK
静電容量(C)
Measuring Frequencies
4
5
4
6 5
6
3
3
7
114.1V
85.9V
1
4
100V
5
2
6
2
Synthesized voltage
7
DC component
AC component
8
±14.1V
2
1
1
8
4
1
DC+AC の波形
Black
3
114.1V
Red
85.9V
100V
9
Voltage of the DC component
Voltage of the AC component
COPY: MEAS̲DCV
DC+AC の波形
COPY: MEAS̲ DC+ACV COPY: MEAS̲DC-ACV
3.3 Measuring Frequencies
114.1V
成分の波形
85.9V
be checked in the sub display. It is not possible to change the frequency range.
1
9
2
3
7
DC 成分の波形
導通
AC 成分の波形
ダイオード
100V
コンダクタンス(S)
±14.1V
Frequency
AC 成分の波形
114.1V
• If signals out of the range of frequency measurement are measured,
[-----] appears. Be aware of it.
• The sensitivity of the frequency measurement is regulated by range.
(Minimum sensitivity voltage (p. 92), Minimum sensitivity current (p. 92))
When the value is less than the minimum sensitivity voltage (current),
COPY: MEAS̲DCuA 温度TEMP
114.1V
85.9V
85.9V
100V
• During the measurement of low frequency, if the auto range does not
40 stabilize and frequency cannot be measured, fix the range and measure again.
±14.1V
100V 100V
COPY: MEAS̲ DC+ACV
ダイオード
4
8
9
5
1
2
COPY: MEAS̲DC-ACV
コンダクタンス(S)
3
6
±14.1V
静電容量(C) 温度TEMP COPY: MEAS̲DCuA 交流電流ACA
4
2 7
3
5
4
6 5
7
6
8
1 8
9
10
9
10
7
8
9
10
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
5
6
MEM
7
交流電流 ( クランプ入力 )
8
9
READ
導通ショート
Decibel Conversion (dBm/dBV)
2
3.4 Decibel Conversion (dBm/dBV)
The result of the AC voltage measurement is decibel-converted for the standard and then displayed. For details on the conversion formula, see “Decibel conversion measurement” (p. 93).
dBm For the voltage measurement, the “power ratio” for power 1 mW by the standard resistance is decibel-converted and then displayed.
(Cable loss)
5 dBV
3
1
4 6 voltage 1 V is decibel-converted and then displayed. (Voltage gain)
2
7
([dBm] or [dBV] lights up)
In the case of [dBm]
Electric telecommunication line
8
1
Amplifier
Transmitter
Black
3
Red
Example: Measuring the [dBm] cable loss
COPY: MEAS̲ dBm
抵抗
4 9
Frequency
In the case of [dBV]
10
Frequency dBV
1
2
3
4
5 dBV
1 Turn on the power while pressing
.
2 / (Select a desired value.)
3 (Confirm the value.)
Standard impedance selection range (p. 93)
COPY: MEAS̲DCA
Even after the power is turned off, the setting is retained.
SLOW
41
6
COPY: MEAS̲ 4-20
7
過負荷検出
RANGE
MAX
クランプ(レンジ設定) マニュアルレンジ オートホールド
SLOW
0adj 後
MAX REL
COPY: MEAS̲ 4-20 OVER レンジオーバー
OVER レンジオーバー
RANGE
HOLD
REL
ΔT
HOLD
ΔT
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
Checking Continuity
3.5 Checking Continuity
The input short circuit is detected and informed via a buzzer and red backlight.
WARNING
Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may
6
Resistance
COPY: MEAS̲ DC+ACV
4
5
1
5
7 3
3
8 2
PEAK
Black
2
Red
9 1
Changing thresholds
Use / to change a threshold. Even after the power is turned off, the setting is retained.
ダイオード
COPY: MEAS̲DCuA
Detection
Open detection
Short circuit detection
20 Ω
(default)
220 Ω or more
50 Ω
250 Ω or more
20 Ω
or less
50 Ω
or less
100 Ω 500 Ω Buzzer
300 Ω or more
600 Ω or more
Does not sound
100 Ω
or less
500 Ω
or less
Sounds
Red backlight
Turns off
Turns on
42
6
COPY: MEAS̲DC-ACV
7
8
コンダクタンス(S)
9
10
交流電流ACA
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Diode
1
2
3
3.6 Measuring Diode
COPY: MEAS̲ACV
The forward voltage of the diode is measured. If the forward voltage of the diode is the threshold or less, it is informed via a buzzer and red backlight.
WARNING
Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.
COPY: MEAS̲DCV COPY: MEAS̲ DC+ACV
1
2
Forward voltage
4
PEAK
1
5
6
Black
3
Red
2
Anode Cathode
7
4
導通
8
9
2
In the case of the opposite connection
1
4 4
3
5
コンダクタンス(S)
5
6
7
交流電流ACA 静電容量(C) COPY: MEAS̲DCuA
Use / to change a threshold.
ダイオード_逆方向
Threshold: 0.15 V/0.5 V (default)/1 V/1.5 V/2 V/2.5 V/3.0 V
Even after the power is turned off, the setting is retained.
43
6
7
8
9
10
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
Measuring Resistance
5
3.7 Measuring Resistance
Resistance is measured.
1
6
WARNING
Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.
7
3
3
8
2
Black
2
Red
9 1
The open terminal voltage is approx. 2.5 V or less. The measurement current (DC) varies depending on the range. (p. 86)
To avoid damage to the measurement object, check the specifications before use.
4
5
6
7
8
9
10
44
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Temperatures
3.8 Measuring Temperatures
Using our optional DT4910 Thermocouples (K), temperatures can be measured.
CAUTION
To avoid damage to the instrument, do not input any voltage or supply current to the thermocouple.
1
2
1
3
RESET
When a breaking state of detected
TEMP F the Thermocouples (K) is
3
4
2
####
Be careful to observe the polarity when connecting the thermocouple.
Checking the temperature change
断線(K熱電対)
Check the following values.
• Relative value display (p. 63)
電源遮断
• Maximum/Minimum value display
(p. 61)
5
6
Changing the temperature units
Celsius and Fahrenheit can be
ブザーOFF
7
DT4910
TEMP C
0−20mA
オートパワーセーブOFF
45
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Temperatures
When measuring temperatures with the thermocouple applied to the surface of the measurement object
Clean the surface so that the thermocouple can make contact with the object securely.
If no numeric value is displayed after the thermocouple is attached ([OPEn] is displayed):
The instrument or thermocouple may be malfunctioning.
Check this with the following procedure.
1 Short-circuit the V and COM terminals of the instrument using the test leads.
To step 2 The ambient temperature is displayed.
The ambient temperature is not displayed.
The instrument is malfunctioning. Send it for repair.
2 Connect the thermocouple in the correct direction.
[OPEn] remains displayed.
The thermocouple may be malfunctioning (blown).
Replace the thermocouple with a new one.
46
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
5
Measuring Electrostatic Capacities
3.9 Measuring Electrostatic Capacities
The capacity of the capacitor is measured.
WARNING
Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.
6
1
7
3
3
8 2
1
2
3
5
4
5 9 1
Black
2
Red
• When measuring the polar capacitor
Connect the V terminal (red test lead) to the + terminal of the capacitor and the COM terminal (black test lead) to the - terminal.
• For components on a circuit board, measurement may not be possible due to the effect of the peripheral circuit.
• If the capacity changes when the measurement range is changed (p. Appx.3)
6
7
47
6
7
8
9
10
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
5
6
7
8
9
2
1
3
4
5
Measuring Conductances (DT4282)
3.10 Measuring Conductances (DT4282)
The resistance is measured and the inverse number is displayed
(Unit: nS, nano-siemen). When the resistance is excessively large, it is used.
Example: When the resistance is 50 M
(M = 10 6 , n = 10 -9 )
Ω
, 1/50 M
When the terminal is open, 0 nS appears.
Ω
= 20 nS.
6
1
WARNING
Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.
2
7
4
8
Black
3
Red
9
10
The open terminal voltage is approx. 2.5 V or less. The measurement current (DC) is approx. 96 nA. (p. 87)
To avoid damage to the measurement object, check the specifications before use.
48
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring Current
3.11 Measuring Current
DC/AC is measured.
DANGER
• Do not input any voltage to the current measurement terminals.
Doing so may result in short circuit accidents.
• To avoid electrical accidents, turn off the power to the circuit before measuring and then connect the test leads.
Measuring DC/AC
1
2
3
Function
is used to toggle between DC and AC.
→ µA Selected to measure 6000 µA or less.
mA Selected to measure 600 mA or less.
A Selected to measure 10 A or less.
(DT4282)
→
→
→
* The 0-20 mA input can be selected via the power-on option. (p. 77)
*
When measuring an unknown current
Set to the high range ( mA for the DT4281, A for the DT4282).
4
5
6
7
49
Find Quality Products Online at: www.
GlobalTestSupply
.com
1
2
3
4
5
6
7
8
9 1
2
3
4
5
Measuring Current
6
DT4281, DT4282
7
1
8
2
Control board
9
4
10
Red Black
3
Example: Measuring the current of the burner flame ( µA )
The measured current value of the burner flame varies with the input impedance of the instrument.
The μA input impedance of this instrument is approx. 100
Ω
.
DT4282
2
1
Power supply
Black
4
Red
Load
3
50
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring AC Using Clamp-on Probe (DT4281)
3.12 Measuring AC Using Clamp-on
Probe (DT4281)
The current is measured using our optional clamp-on probe (9010-
50, 9018-50, 9132-50). To connect to this instrument, the 9704
Conversion Adapter is required. Before using the clamp-on probe, be sure to read the Instruction Manual which accompanies the optional clamp.
1 2
1
2
3
9704 Conversion Adapter 4
3 Clamp-on Probe
5
5
Set the clamp-on probe and the instrument to the same range.
4
Current range
6 Change the range in accordance with the actual measurement.
If the range of the clampon probe is changed during measurement, change the range of the instrument as well.
51
6
7
Find Quality Products Online at: www.
GlobalTestSupply
.com
Measuring AC Using Clamp-on Probe (DT4281)
When clamping a cable
Attach the clamp around only one conductor.
Single-phase (2-wire) or three-phase (3-wire) cables clamped together will not produce any reading.
OK NO NO
When blinks
The measured value exceeds maximum display counts. Increase
NO
OK
52
NO
NO
NO
Find Quality Products Online at: www.
GlobalTestSupply
.com
RESET
####
VERSION
RESET
####
COPY: MEAS̲ dBm
メモリデータなし
断線(K熱電対)
VERSION
TEMP F
断線(K熱電対)
電源遮断
4-20 mA (0-20 mA) % Conversion
TEMP F
電源遮断
3.13 4-20 mA (0-20 mA) % Conversion
The 4-20 mA (or 0-20 mA) signal of the instrumentation system can be converted to 0% to 100% and checked.
• 4 mA - 20 mA → 0% - 100%
(An input exceeding 20 mA is displayed up to a maximum of 350%.)
• 0 mA - 20 mA → 0% - 100%
(An input exceeding 20 mA is displayed up to a maximum of 300%.)
1
2
Two-wire transmitter
4-20 mA
24 V
Sensor Output signal
1
2
3
4
Red
4
3
Black
Distributor 5
TEMP C
0−20mA
1 Turn on the power while pressing .
2 / (Select a desired value.)
3 (Confirm the value.)
The regular display reappears.
Even after the power is turned off, the setting is retained.
6
7
ブザーOFF
COPY: MEAS̲ 4-20
0−20mA
OVER
53
メモリデータなし
OVER 最大入力範囲超え
メモリデータクリア
過負荷検出
ブザーOFF
Find Quality Products Online at:
RANGE HOLD
オートパワーセーブOFF
www.
GlobalTestSupply
.com
SLOW MAX REL ΔT

Public link updated
The public link to your chat has been updated.
Advertisement