OPERATING INSTRUCTION
ZI-9940
AC CLAMP METER
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to
the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous
voltages may be present
Double insulation
SAFETY NOTES
Do not exceed the maximum allowable input range of any function
Do not apply voltage to meter when resistance function is selected.
Set the function switch OFF when the meter is not in use.
WARNINGS
Set function switch to the appropriate position before measuring.
When measuring volts do not switch to current/resistance modes.
When changing ranges using the selector switch always disconnect the test leads from the
circuit under test.
Do not exceed the maximum rated input limits.
CAUTIONS
Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before operating the meter.
Always remove the test leads before replacing the battery.
Inspect the condition of the test leads and the meter itself for any damage before operating the
meter. Repair or replace any damage before use.
Use great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. These voltages are considered a shock hazard.
Remove the battery if the meter is to be stored for long periods.
Always discharge capacitors and remove power from the device under test before performing
Diode, Resistance or Continuity tests.
Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty
of connection to the recessed electrical contacts. Other means should be used to ensure that
the terminals are not "live".
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
Input Limits
Function
Maximum Input
A AC
200A
V DC, V AC
600V DC/AC
Resistance, Diode, Continuity Test
600V DC/AC
Meter Description
1. Current clamp
2. Clamp trigger
3. Rotary Function swith
4. LCD display
5. MAX Hold/ Backlight button
6. Mode select button
7.
COM input jack
8.
V
Ω
jack
9.
Battery Cover
1.
AC DC
AC (alternating current) and DC (direct currrent)
2.
Minus sign
3.
1.8.8.8
2000 count (0 to 1999) measurement reading
4.
AUTO
AutoRange mode
5.
MAX
MAX Hold mode
6.
Diode test mode
7.
•)))
Audible Continuity
8.
HOLD
Data Hold mode
9.
BAT
Low Battery icon
10.
m,V,A,K,M,
Ω
Units of measure list
Specifications
Function
Range & Resolution
Accuracy (% of reading)
AC Current
200.0 AAC
± (2.5% + 10
digits
)
DC Voltage
200.0 mVDC
±
(
0.5% + 5 digits)
2.000 VDC
± (1.2% + 3 digits)
20.00 VDC
200.0 VDC
600 VDC
± (1.5% + 3 digits)
AC Voltage
2.000 VAC
± (1.5% + 3 digits)
20.00 VAC
200.0 VAC
600 VAC
± (2.0% + 4 digits)
Resistance
200.0
± (1.0% + 4 digits)
2.000K
± (1.5% + 2 digits)
20.00K
200.0K
2.000M
± (2.0% + 3 digits)
20.00M
± (3.0% + 5 digits)
Clamp size
Opening 0.7" (18mm) approx
Diode Test
Test current of 0.3mA typical; Open circuit voltage 1.5V DC
typical.
Continuity Check
Threshold <120
; Test current < 1mA
Low Battery Indication
“ BAT” is displayed
Overrange Indication
“OL “ is displayed
Measurements Rate
2 per second, nominal
Input Impedance
7.8M
(VDC and VAC)
Display
3-1/2 digits (2000 counts) LCD
kM
BAT
