Data Sheet
AM-250
Professional Electrical
Multimeter
A professional multimeter for Electrical and HVAC applications.
Safety rated to CAT III 600V and CAT II 1000V for indoor
applications requiring direct connection to main panel of the
building. The AM-250 measures complete range of electrical
parameters including voltage, current, resistance and frequency.
It also covers HVAC application with temperature, capacitance and
micro amps functions.
13 Features
Measures AC/DC voltage up to 1000V, Current,
Resistance, Frequency, Capacitance and Temperature
Audible continuity
No hassle
warranty
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No shipping
charges.
Our commitment to
high-quality products
and customer service
is demonstrated by
our industry exclusive
“No Hassle” warranty.
In the unlikely event
that an Amprobe Test
Tool requires warranty
service, any of our
local dealers are
authorized to replace
it, on the spot.
(note: $500 MSLP limit)
Diode Test
Auto and manual ranging
Relative zero mode
Data hold
Peak hold (30ms response time)
Backlight display
Large, easy to read LCD display
BEEP-JACK audible warning against improper
connection
Auto power off
Safety CAT III 600V
Amprobe® Test Tools
AM-250 Professional Electrical Multimeter
Data Sheet
Specifications
General Specifications Display 3-3/4 digits 4000 counts LCD display
Polarity Automatic
Update Rate 3 per second nominal
Operating Temperature 0°C to 40°C (32°F to 104°F)
Relative Humidity Maximum relative humidity 80% for temperature up to 31°C decreasing linearly to 50% relative
humidity at 40°C
Altitude Operating below 2000m
Storage Temperature -20°C ~ 60°C (-4°F to 140°F), < 80% R.H. (with battery removed)
Temperature Coefficient nominal 0.15 x (specified accuracy)/ºC @(0°C - 18°C or 28°C - 40°C), or otherwise specified
Sensing Average sensing
Pollution Degree 2
Safety The meter (all versions) is protected, against the users, by double insulation per UL3111-1
(1st Edition), IEC61010-1 (1st Edition) + A1 and A2, CAN/CSA - C22.2 No. 1010.1 - 92 to CAT II 1000V &
CAT III 600V.
Protection-reinforced CE Terminals (to COM) ratings:
V: Category II 1000 Volts AC & DC, and Category III 600 Volts AC & DC.
A / mAµA: Category III 500 Volts AC and 300 Volts DC.
Overload Protections
Protection-reinforced CE µA & mA: 0.63A/500V, IR200kA, F Fuse;
A: 12.5A/500V, IR20kA, F Fuse;
V: 1050Vrms, 1450Vpeak;
Ω & Others: 600VDC/ VAC rms
E.M.C . Meets EN61326(1997, 1998/A1), EN61000-4-2(1995), and EN61000- 4-3(1996)
In an RF field of 3V/m Capacitance function is not specified AC 4.000V range: Total Accuracy = Specified Accuracy + 700
digits AC 400.0µA range: Total Accuracy = Specified Accuracy + 300 digits Other function ranges:
Total Accuracy = Specified Accuracy + 40 digits Performance above 3V/m is not specified
Transient protection 6.5kV (1.2/50µs surge)
Power Supply 1.5V AA A Size (NEDA 24A or IEC LR03) battery X 2
Power Consumption 3.2 mA
typical Low Battery Below approx. 2.4V
Sleep Mode Timing Idle for 30 minutes
Sleep Mode Consumption 360µA
Dimension 193(L) x 97(W) x 46(H)mm (7.6 X 3.8 X 1.8 in)
Weight Approx. 370 gm / 0.815 lb
Special Features 25ms Max Hold; Data Hold; Relative zero mode; Beep-jack™ input warning; Back-lighted display
Amprobe® Test Tools
AM-250 Professional Electrical Multimeter
Electrical Specification
Accuracy is ±(% reading digits + number of digits) or otherwise specified, at 23 ºC ±5 ºC & less than 75% R.H.
Range Accuracy
400.0 mV 0.3% + 4d
4.000V, 40.00V, 0.5% + 3d
400.0V
1000V 1.0% + 4d
DC Voltage Range Accuracy
50Hz -- 500Hz 400.0mV* 4.0% + 5d
4.000V, 40.00V, 1.5% + 5d
400.0V
1000V 4.0% + 5d
AC Voltage Range Accuracy*
-20 ºC TO 300 ºC 2% + 3 ºC
-4 ºF TO 572 ºF 2% + 6 ºF
NMRR: >50dB @ 50/60Hz
CMRR: >120dB @ DC, 50/60Hz, Rs=1kΩ
CMRR: >60dB @ DC to 60Hz, Rs=1kΩ
Input Impedance: 10MΩ, 30pF nominal (1000MΩ for 400.0mV range)
*Selection by RANGE button manually,
Type-K Temperature is specified from
*Type-K thermocouple range & accuracy
Specified accuracy ± 50 digits for changes > 25ms in duration
Data Sheet
DC Current Range* Accuracy**
Capacitance 500.0nF, 5.000µF,
50.00µF, 500.0µF, 3.5%*** + 6d
3000µF
Voltage Range Accuracy Burden
400.0µA 2.0% + 5d 0.15mV/µA
4000µA 1.2% + 3d 0.15mV/µA
40.00mA 2.0% + 5d 3.3mV/mA
400.0mA 1.2% + 3d 3.3mV/mA
4.000A 2.0% + 5d 0.03V/A
10.00A* 1.2% + 3d 0.03V/A
*10A continuous, 20A for 30 second max with 5 minutes cool down interval
AC Current Range Accuracy Burden
50Hz -- 500Hz 400.0µA 2.0% + 5d 0.15mV/µA
4000µA 1.2% + 3d 0.15mV/µA
40.00mA 2.0% + 5d 3.3mV/mA
400.0mA 1.2% + 3d 3.3mV/mA
4.000A 2.0% + 5d 0.03V/A
10.00A* 1.2% + 3d 0.03V/A
*10A continuous, 20A for 30 second max with 5 minutes cool down interval
Amprobe® Test Tools
AM-250 Professional Electrical Multimeter
Ohms Range Accuracy
400.0Ω 0.8% + 6d
4.000kΩ, 40.00kΩ, 400.0kΩ 0.6% + 4d
4.000MΩ 1.0% + 4d
40.00MΩ 2.0% + 4d
Open Circuit Voltage 0.4VDC typical
Audible Continuity Tester
Audible Threshold between 10Ω and 120Ω
*Additional 50.00nF range accuracy is not specified
**Accuracies with film capacitor or better
***Specified with battery voltage above 2.8V (approximately half full battery).
Accuracy decreases gradually to 12% at low battery warning voltage of approximately 2.4V
Hz Frequency Range* Accuracy**
50.00Hz, 500.0Hz, 0.5%+4d
5.000kHz,
50.00kHz,
500.0kHz,
1.000MHz
*Additional 5.000Hz range accuracy & sensitivity are not specified
**Accuracy is specified at < 20VAC rms Input Signal: Square wave with duty cycle > 40% & < 70%;
or Sine wave Vrms AC Sensitivity: 10Hz--20Hz : > Sine 0.9Vrms; 20Hz--500kHz: > 2.6Vp; or Sine
1.9Vrms; 500kHz--1MHz: > 4.2Vp; or Sine 3Vrms Update Rate: 2 per second nominal
Data Sheet
Diode Tester Open Circuit Voltage Test Current (Typical)
< 1.6 VDC 0.25mA
Included Accessories Test leads (pair), Banana plug K-type thermocouple, batteries installed, user’s manual
Amprobe® Test Tools
©2009 Amprob e Test Tools. All rights re serve d.
10/2009 352073 5 Rev A
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