User's Manual
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech 382075 Product Page
Model 382075
3
φ/1φ Power Clamp-on Meter
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Introduction
Congratulations on your purchase of the Extech Model 382075 Auto Range Power Clamp-On Meter.
Careful use of this device, will provide years of reliable service.
Meter Functional Description
1. Transformer Jaw
Used to sense current signal. To measure current or power, the conductor under test must be fully enclosed by the jaw.
2. Transformer Trigger
Press to open the jaw.
3. Data Hold Button
Press to freeze most recent reading on the LCD. Press again to release.
4. Function Select and On/Off Switch
Select desired function, such as KW, V, A, KVA, or 3
φ.
5. LCD Display
4-digit (9999 count) display with function symbols, units, decimal point, low battery icon, and zero indication.
Figure 1
6. Units Symbols
Once a function is selected, the corresponding unit (KW, V,
A, Phase, KVA, or 3
φ) will be displayed.
7. 3
φ3W and 3φ4W Select Button
If the 3
φ system is not a balanced system, users can press this button to select 3
φ3W, 3φ4W or a balanced system.
Once the button is pressed, the LCD displays 3
φ3W or
3
φ4W depending on the function selected.
8. Read/Next Button
•
•
•
•
When the rotary switch is set to the 3
φ function, the READ/NEXT button is used as a NEXT button.
In the 3
φ balanced mode, pressing the NEXT button will display W+PF, KVA+KVAR, or V+A data.
In the 3
φ3W mode, pressing the NEXT button stores the measured values W
RS(L1L2)
and W
TS(L3L2)
.
After two values are measured and stored, the meter adds the two values, displays the result with the symbol W again.
In the 3
W
T(L3)
RST
to represent W
3
φ3W
. To start another W
3
φ3W
measurement, press the NEXT button
φ4W system mode, press the NEXT button to store the measured values W
R(L1)
, W
S(L2)
and
. After three values are measured and stored, the meter adds the three values, displays the result with the symbol W
RST
to represent W
3
φ4W
. To start another W
3
φ4W
measurement, press the
NEXT button again.
If the rotary switch is not set to the 3
φ function, the READ/NEXT button is used as a READ button.
Stored data in memory (saved by pressing the REC button) can be read by pressing READ.
9. & 10. V and COM Input Terminals
Used as positive and negative (common) inputs for voltage measurements.
11. DC A/W ZERO button
Press this button once to zero the Amp or Watt display. While the meter is zeroing, the word ZERO appears the LCD.
12. REC button
Press the REC button to store up to 4 data points in meter memory.
Operating Instructions
NOTE: Ensure that the jaws are clear of any conductors before applying power to the meter. The meter performs an auto zero upon power-up to null any residual magnetism. If this is done with a conductor inside the jaw area, the auto zero function will cause subsequent measurements to be inaccurate.
DC/AC 1
φ
2W Power (W) and Power Factor (PF) measurements
1. Apply power to the meter with the jaws clear of any conductors.
2. Set the rotary switch to the Watts function
(KW).
3. If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero it.
4. Insert the test leads into the input terminals.
5. Connect the COM (black) terminal to the neutral line.
6. Connect the V (red) terminal to the power line.
7. Clamp on to the line where the V (red) terminal is connected. The power clamp will automatically select the proper measurement range. Read the Watt and PF (Power Factor) values displayed on the LCD.
1 Phase 2 Wire
Current >
1 Phase
Load
Figure 2
NOTE: The "+" sign printed on jaw must face the power source for accurate measurements.
AC/DC Voltage Measurements
Voltage (V) and Frequency (Hz) Dual Display
WARNING: Maximum input voltages: 1000VDC and 750VAC. Do not attempt to measure voltage that exceeds these limits.
Figure 3
1. Set the rotary switch to the Voltage position (V).
2. Insert the test leads into the input terminals.
3. Connect the test leads in PARALLEL with the circuit to be measured.
4. The power clamp will automatically select the proper range.
5. Read the voltage and Frequency values displayed on the LCD.
NOTE: The sensitivity for voltage/frequency measurements is 1V, and the frequency range is 10 - 400Hz. If the frequency is < 10 Hz, the LCD will indicate 0 Hz. If the frequency is > 400 Hz, LCD will show OL.
Voltage(V) / Current (A) Dual Display
Follow the instructions in the section entitled "3
φ Balanced Power
Measurements" to monitor V and A simultaneously.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
AC/DC Current Measurements
Current (A) + Frequency (Hz) Dual Display
WARNING:
1. When applying power to the meter, make sure the clamp jaws are not near a conductor.
2. Make sure that test leads are disconnected from the meter during current measurements.
1. Set the rotary switch to the Amps position (A).
2. Push and hold the DCA/DCW ZERO button to zero the reading.
3. Press the trigger to open the jaw and fully enclose the conductor to be measured. The Jaws must be completely closed to make a measurement (see Fig.4).
4. Read the current/frequency values on the LCD.
NOTE: The sensitivity for current/frequency measurement is
5A, and the frequency range is 10 - 400Hz. If the frequency is
< 10 Hz, the LCD will display 0 Hz. If the frequency is > 400
Hz, LCD will display "OL".
Figure 4
Voltage (V) and Current (A) Dual Display
Follow the instructions in the section entitled "3
φ Balanced
Power Measurements" to monitor Voltage and Current simultaneously.
DC/AC 1
φ
2W Apparent/Reactive Power Measurements (KVA+KVAR)
NOTE: Before taking any measurements, zero the current (A) reading and set the rotary switch to the KVA position.
Follow the steps listed in section entitled DC+AC 1
φ2W Power (W) and Power Factor (PF) measurement for these measurements. KVAR is a calculated value, and its accuracy greatly depends on the accuracy of the V, A, and KW readings. To obtain a more accurate KVAR value when PF is greater than 0.91 (
φ < 25°), measure the phase angle and obtain the KVAR from the following equation for a pure sine wave:
KVAR = KVA * sin
φ
Phase Angle Measurements
1. Set the rotary switch to the A position. If the current reading is not zero, press the DCA
ZERO button.
2. Set the rotary switch to the Phase position.
3. Insert the test leads into the input jacks.
4. Connect the test lead inserted in the COM (black) terminal to the reference line.
5. Connect the test lead connected to the V (red)
1 Phase 2 Wire Current >
1 Phase
Load
V
terminal to the voltage signal under test.
6. Clamp on to the wire where the V (red) terminal is connected (see Fig.5).
7. If current signal is detected from the jaws, the phase angle will be displayed in degrees on the
A
-23.8
o
XL
LCD together with the frequency of the voltage.
8. If current is not detected, only the frequency of the voltage will be displayed while the phase angle display will be left blank.
Figure 5
NOTE: Zero the current (A) reading before measuring to avoid incorrect Phase Angle readings.
INDUCTIVE LOAD: A negative phase angle indicates that the current signal lags the voltage signal. A negative phase angle also indicates an inductive load.
CAPACITIVE LOAD: A positive phase angle indicates that the current signal leads the voltage signal. A positive phase angle also indicates a capacitive load.
NOTE: The "+" sign printed on the clamp jaw must face the power source for correct readings.
3
φ
Balanced Power Measurements
Power (W) and Power Factor (PF) Dual Display
1. Apply power to the meter with the jaw clear of any conductors.
2. Set the rotary switch to the 3
φ position.
3. The LCD will show 3
φ3W, 3φ4W, and BAL symbols to indicate balanced mode.
4. If the watt reading is not zero, press the DCA/DCW
3 Phase 4 Wire
R(L1)
S(L2)
T(L3)
N
ZERO button once to zero reading
5. Insert the test leads into the input terminals.
6. Select one phase (R or L1) as COM and Connect the COM (black) terminal to the same phase just
Figure 6
selected (R or L1).
7. Connect another test lead to the second phase (S or L2). See Fig. 6.
8. Clamp on to the third phase (T or L3).
9. The power clamp will automatically select proper range.
10. Read the Watt and PF values displayed on the LCD.
11. To view the KVA and KVAR data, press the NEXT button.
12. To view V and A, press the NEXT button again.
13. To return to the W and PF display, press the NEXT button again.
Current >
3-phase
Bal. Load
KVA/KVAR Dual Display
Follow steps 1 through 10. in the above section and press the NEXT button. Wait approx. 2 seconds for the LCD to display the KVA and KVAR.
Voltage (V) and Current (A) Dual Display
Follow steps 1 through 10 in the above section and press the NEXT button twice. Wait approx. 2 seconds for the LCD to display Voltage (V) and Current (A).
NOTE: Specific selection of each phase is not required in 3
φ balanced power measurement mode. As long as each test lead and the jaws are connected to different phases, the reading is always correct. The "+" sign printed on jaw must face the power source for accurate measurement.
NOTE: To find out if a load is capacitive or inductive, refer to the section entitled "Phase Angle
Measurements".
3
φ
3W Unbalanced Power Measurements
Two measurements W
RS
(or W
(or W
L1L2
L1L2
) and W
TS
(or W
L3L2
) are required. Refer to Fig. 7.
1. First measure W
RS
) a. Apply power to the meter with the jaw clear of any conductors. b. Set the rotary switch to the 3
φ position. c. Press the 3
φ button once, the 3φ3W symbol will display on the LCD. At this moment, the W symbol flashes prompting the user to begin measurement of W
RS.
d. If the watt reading is not zero, press the DCA/DCW ZERO button once to zero reading e. Insert the test leads into the input terminals.
RS
f. Select one phase (S or L2, for example) as COM and connect the COM (black) terminal to that phase (S or L2). g. Connect V (red) terminal to the second phase (R or L1). h. Clamp on to the same phase as in step g. (R or L1).
The power clamp will automatically select the proper range. i. Wait until the reading stabilizes, then press the NEXT button. The W disappear. At this moment, W
RS
is stored in memory, and the W
T
L3L2
) measurement.
RS
(W
L3L2
(W
L1L2
) symbol will
) symbol appears flashing to prompt the user to take the W
2. Secondly, measure W
TS
(or W
L3L2
TS
(W
). Refer to Fig. 8. a. Disconnect the test leads and jaws from the lines in the previous measurement. b. Connect the test leads to the third phase (T or L3). c. Open and close the jaws, be sure that no conductor is in the jaws. d. If the watt reading is not zero, press the DCA/DCW ZERO button once to zero the reading. e. Clamp on to the third phase where the test lead is connected (T or L3) f. The power clamp will automatically select proper range. g. Wait until the reading stabilizes, then press the NEXT button. The W
T
(or W
L3L2
) symbol will disappear. At this moment, W
TS
(or W
L3L2
) data are stored in memory,
Once the NEXT button is pressed (after measurements of W
RS
(or W
L1L2
) and W clamp will add the two values and display the result on the LCD. The W
RST
TS
(or W
L3L2
)), the power
symbol appears indicating that the reading shown is the wattage of the 3
φ3W unbalanced Power. PF is not shown in the 3φ3W unbalanced power mode.
W
3
φ
W
= W
RST
= W
RS(L1L2)
+ W
TS(L3L2)
3 Phase 3 Wire
R(L1)
S(L2)
T(L3)
W
RS (L1L2)
Current >
3 Phase
Load
R(L1)
3 Phase 3 Wire
S(L2)
T(L3)
Current >
W
TS (L3L2)
3 Phase
Load
FIGURE 8
FIGURE 7
NOTE: Once a phase is selected as the COMMON connection, users cannot change this selection in the subsequent measurements. For example, if S (or L2) phase is selected, S (or L2) phase is always connected to the COM of the power clamp during measurements of W
RS
W
L1L2
) and W
TS
(or W
L3L2
) in 3
φ 3W unbalanced power mode.
(or
NOTE: The "+" sign printed on the jaw must face the power source.
NOTE: In the 3
φ3W unbalanced power measurement mode, W
RS
or W
TS
could be a negative value. Users must make sure all the connections are correct to obtain correct power readings.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
3
φ
4W Unbalanced Power Measurements
The measurements of W
1. First, measure W
R
R
(or W
(or W
L1
L1
), W
S
(or W
) (Fig. 9).
L2
), and W
T
(or W
L3
) are required for these measurements. a. Apply power to the meter with the jaw clear of any conductors. b. Set the rotary switch to the 3
φ position. c. Press the 3
φ button twice, and the 3φ4W symbol appears singularly on the left side of the LCD.
The W
R
symbol will flash prompting the user to take the W
R.
measurement
Note: If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero reading d. Insert the test leads into the input terminals
R(L1)
S(L2)
T(L3)
3 Phase 4 Wire
Current >
W
R (L1)
3 Phase
Load
N
e. Connect the neutral line to the COM
(black) terminal. f. Connect the V (red) terminal test lead to the first phase (R or L1). g. Clamp on to the same phase (R or L1). h. The power clamp meter will automatically select the proper range. i. Wait until the reading is stable, then press
FIGURE 9
the NEXT button. The W
R
symbol will disappear. Now, W symbol flashes prompting the user to take the W
R
is stored in the memory, and the W
S
S
measurement.
2. W
S
(or W
L2
) (Fig. 10). a. Disconnect the test leads from the phase where the jaw was clamped onto as described in the section entitled "3
φ 3W unbalanced power measurements".
3 Phase 4 Wire
R(L1)
S(L2)
T(L3)
Current >
W
S (L2)
3 Phase
Load
b. Connect V (red) terminal to the second phase (S or L2). d. If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero
N
reading
e. Clamp onto the phase where the test lead is connected to (S or L2 phase) f. The power clamp will automatically select the proper range. g. Wait until the reading stabilizes, then press the NEXT button. The W
S is now stored in memory.
FIGURE 10
symbol will disappear. W
S
W
T
(or W
L3
). See Fig. 11. a. Disconnect the test lead from the phase where the Jaw was connected in the section entitled "3
φ3W Unbalanced
Power Measurements". b. Connect the test lead inserted in the V
(red) terminal to the third phase (T or
L3 phase). d. If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero reading e. Clamp onto the phase where test lead is connected to (T or L3).
R(L1)
S(L2)
T(L3)
N
3 Phase 4 Wire
Current >
W
T (L3)
3 Phase
Load
FIGURE 11
f. The power clamp will automatically select the proper range. g. Wait until the reading stabilizes, then press the NEXT button. The W
4. Once the NEXT button is pressed (after measurements of W
R the three values W
R
, W
S
, and W
T
T
symbol will disappear and W
W
S
T
will be stored in memory,
, and W
T
), the power clamp will add
together and display the result on the LCD. The W
RST
symbol will appear indicating that the reading shown is the wattage of the 3
φ4W unbalanced circuit. PF is not shown in the 3
φ4W unbalanced power measurement mode.
W
3
φ
W
= W
RST
= W
R(L1)
+ W
S(L2)
+ W
T(L3)
NOTE: The "+" sign printed on jaw must face the power source.
NOTE: In the 3
φ4W unbalanced power measurement mode, all three W
R
or W
S
and W
T
readings must be positive. If one is negative, check the connection of the test leads and the clamping of jaw. Make sure test lead and clamp connections are correct to obtain useful power readings.
1
φ
3W Power Measurement
1
φ3W power measurements are similar to 3φ3W unbalanced power measurements except that the nomenclature is different. Two measurements of W
RS
(or W
L1G
) and W
TS
(or W
L2G
) are required
1. First, measure W
RS
(or W
L1G
). See
Fig.12.
a. Apply power to the meter with the jaw clear of any conductors
b. Set the rotary switch to the 3
φ position.
c. Press the 3
φ button once, and the 3
φ3W symbol will singularly appear on the left side of the LCD.
The W
RS
symbol will flash prompting the user to measure
1 Phase 3 Wire
L1
G
L2
W
RS(L1G).
d. If the watt reading is not zero, press the DCA/DCW ZERO button once to zero it. e. Insert the test leads into the input terminals. f. Connect the COM (black) terminal to ground. g. Connect the V (red) terminal to the second phase (L1). h. Clamp on to the same phase as connected in step g. (L1).
W
L1
Current >
1 Phase
Load
1 Phase
Load
FIGURE 12
i. The power clamp will automatically select the proper range.
j. Wait until the reading stabilizes, then press the NEXT button. The W disappear and the W
RS(L1G)
reading will be stored in memory. The W
T prompting the user to take W measurements.
2. Secondly, measure W
TS
(or W
L2G
TS
(W
L2G
). Fig. 13. a. Disconnect the test leads from the phase where the jaws were clamped
)
L1
G
1 Phase 3 Wire
W
L2
(W
RS
(W
L2G
1 Phase
Load
L1G
) symbol will
) symbol will flash onto in the previous measurement. b. Connect the test lead to the L2 line. d. If the watt reading is not zero, press the DCA/DCW ZERO button once to
L2
Current >
1 Phase
Load zero reading e. Clamp on to the L2 line where the test lead is connected. f. The power clamp will automatically
FIGURE 13
select the proper range. g. Wait until the reading is stable, then press the NEXT button. The W
W
L2G
T
(or
) symbol will disappear. At this moment, W
TS
(or W
L2G
) is stored in the memory,
3. Once the NEXT button is pressed after measurements of W
RS
(or W
L1G
) and W
TS
(or W
L2G the power clamp will add the two values together and show the result on the LCD. The W
) are taken,
RST
symbol will display along with the wattage of the 1
φ3W unbalanced Power. PF is not shown in 1φ3W unbalanced power mode. See equation below.
W
1
φ
W
= W
RST
= W
RS(L1G)
+ W
TS(L2G)
Calculation of 3
φ
4W Power Factor (PF)
When measuring 3
φ4W unbalanced power, use the REC button to record the individual power factors
(KW
R(L1)
, PF
R(L1)
, KW
S(L2)
, PF
S(L2)
, KW
T(L3)
, and PF be calculated using the following equation:
T(L3)
) of each phase in memory. 3
φ4W power factor can
KVA
R(L1)
KW
R(L1)
=
PF
R(L1)
KW
;KVA
S(L2)
=
PF
S(L2)
;KVA
S(L2)
T(L3)
=
KW
S(L3)
PF
T(L3)
KVA
3
φ
W
= KVA
R(L1)
+ KVA
S(L2)
+ KVA
T(L3)
PF
KW
3
φ
W
3
φ
W
=
KVA
3
φ
W
Improving the Power Factor of a 3
φ
4W Power System
Measure the KVAR
R
(or KVAR
L1
), KVAR
S
(or KVAR
L2
), and KVAR
T
(or KVAR
L3
) values of each phase.
Based upon the measured values, a 3
φ or 1φ capacitor at the rated voltage and frequency can be used to improve the power factor. To find the value of capacitance, refer to the following equation.
Where:
f: frequency in Hz
V: phase voltage
Capacitance(Farad) =
KVAR*1000
2
πfV2
It is recommended that the KVAR value of the capacitor a somewhat less than the value measured.
Improving the Power Factor of a 3
φ
Balanced Power System
1. Measure the KVAR 3
φ value of a balanced system.
2. Based upon the measured value, a 3
φ capacitor at the rated voltage and frequency can be used to improve power factor.
3. To find the value of capacitance, refer to the equation in the section above.
4. It is recommended that the KVAR value of the capacitor be somewhat less than the value measured.
Improving Power Factor of a 1
φ
2W Power System
1. Measure KVAR value of a 1
φ2W power system.
2. Based upon the measured value, users can purchase required capacitor at rated voltage and frequency to improve power factor.
3. If value of capacitance is needed, obtain the value via the equation in the section entitled
"Improving Power Factor of 3-phase 4-wire System".
4. It is recommended that the KVAR value of the capacitor should be a little less than the value measured.
NOTE: The indication of phase sequence is not limited to 3
φ balanced power. It can be used in general as long as the Power Factor is greater than 0.1.
Phase Sequence Indication (for Power Factor > 0.1)
In the 3
φ balanced power mode the meter will automatically detect the phase relationship between three individual phases.
1. Set the rotary switch to the 3
φ position.
2. Connect the voltage input (red terminal) to the ‘R’ (or
L2
L3
L1
L3
L1) phase, connect the COM input (black terminal) to the ‘S’ (or L2) phase, and clamp on the T (or L3) phase. When clamping onto the T (or L3) phase, the power clamp must face the power source.
L3
3. If the phase sequence is clockwise, R, S, T sequence will flash on the display.
4. If the phase sequence is counterclockwise, T, S, R
L2 L1
L1 L2 sequence will flash.
5. If current is not detected, only one of the R, S or T phases will be represented on the LCD. See Fig.
14.
FIGURE 14
NOTE: The "+" sign printed on jaw must face the power source for correct measurement.
Recording Data
The power clamp can store 4 data points in memory. To store data displayed on the LCD, press the
REC button. If the power clamp already has 4 data points memorized, the LCD will display FULL.
The REC symbol will be displayed on the LCD if any data is currently stored in memory. To clear the meter memory, power the meter down.
Recalling Data from Memory
To retrieve data from memory, press the READ button. NOTE: The rotary switch must not be set to the 3
φ function when reading memory data. Once the READ button is pressed, the reference number of the data will be displayed first; the stored measurement data will then be displayed.
While in the READ mode, the REC. and No. symbols will be displayed on the LCD. To exit the
READ function, select another function using the rotary switch.
NOTE: If both the REC and the No. symbols are shown on LCD, the reading shown on the
LCD is the data stored in memory, not actual measurement data.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Specifications
General Specifications
Conductor Size
Display
Sampling time
Overload Indication
Power
Power consumption
Operating conditions
Dimensions
Weight
Cable
Φ55mm. (approx.) Bus Bar 65mm (D) x 24mm (W)
Dual 4-digit 9999 count LCD
0.5 seconds for Voltage and Current; 1.6 seconds for Watts
‘OL’ displayed on LCD
9V Battery (Heavy Duty Type)
Approx. 28mA
4
°C to 50°C <85% RH
10.7" (L) x 4.4" (W) x 1.8" (H)271mm (L) x 112mm (W) x 46mm (H)
22.8 oz. / 647g (with battery)
AC/DC KW True Power (PF 0.2 - 1.0, 3
φ3W, 3φ4W, 1φ2W, and 1φ 3W) Balanced
Range Resolution Accuracy
(of reading)
0 - 99.99KW
0 - 999.9KW
1000-
2000KW
0.01KW
0.1KW
±2.0% ±0.5KW
±2.0% ±0.5KW
Maximum Input
Current Voltage
200A
2000A
500V AC/DC
600VAC 800VDC
AC/DC Voltage
(True RMS, Crest Factor < 4, Autorange, Overload Protection 800VAC)
Range
0-200V
200-500V
500 - 600VAC
500 - 800VDC
Accuracy (of reading)
Resolution DC, 50 / 60 Hz
0.1V ±1.5% ±5dgts
40 - 400Hz
±2.0% ±5dgts
0.1V
1V
±1.5% ±5dgts
±1.5% ±5dgts
±2.0% ±5dgts
±2.0% ±5dgts
Input Impedance
10M
Ω
AC/DC Current (True RMS, Crest Factor < 4):
Range
0 - 200A
200 - 500A
500-2000A
Accuracy (of rdg)
Resolution DC, 50 / 60 Hz 40 - 400Hz
0.1A ±1.5% ±5dgts ±2.0% ±5dgts
0.1A
1A
±2.0% ±5dgts
±2.5% ±5dgts
±2.5% ±5dgts
±3.0% ±5dgts
Overload Protection
AC 3000A
AC/DC KVA (Apparent Power)
KVA = V*A / 1000
AC KVAR (Reactive Power, PF < 0.91)
Range Resolution Accuracy
0 – 1200KVAR 0.1 / 0.01
1 KVAR or +/-3%rdg+9d
(whichever is greater)
Remark
For more information, refer to the section entitled "DC/AC 1
φ2W Apparent/Reactive
Power measurements"
Phase Angle (User must zero the current reading before taking measurements)
Range Accuracy Sensitivity
50/60 Hz
± 2.0
° V > 100V, A > 10A
Remark
Zero Crossing Detection
Note: If current signal is not detected, the phase angle will be left blank in LCD.
Frequency (if < 10 Hz, then the Hz Display = 0)
Range Accuracy
50/60 Hz ±2 dgts
10 - 400 Hz 0.5% ± 2dgts
Sensitivity
V > 1V, A > 5A
