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This product is discontinued

Amprobe AM-540 Advanced HVAC Multimeter


The recall does not effect the
AM-540-EUR Digital Multimeter.

AM-540
AM-540
AM-540
The AM-540 Advanced HVAC Multimeter is specifically designed for the more demanding HVAC applications. The AM-540 measures a complete range of electrical parameters and key functions such as dual thermocouples for taking differential temperature measurements, low pass filter to take accurate measurements on variable frequency drives and capacitance to check motor startup capacitors. It also features micro amps for flame sensor troubleshooting, and a complete range of electrical parameters. With built-in flashlight and VolTect ™ non-contact voltage detection, the AM-540 is the choice multimeter for a professional HVAC technician.


AM-500 AM-510 AM-520 AM-530 AM-540 AM-550

Multimeter Type Auto-ranging Com / Res HVAC Electrical Adv. HVAC Industrial
F
U
N
C
T
I
O
N
Safety Rating Safety CAT III 600V CAT III 600V CAT III 600V
Cat II 1000
CAT III 600V
Cat II 1000
CAT III 600V
Cat II 1000
CAT III 600V
Cat II 1000
Measure voltage in noisy environments True rms



Electrical panels, AC outlets AC Voltage (V) 600 600 750 750 1000 1000
DC systems, auto/marine batteries DC Voltage (V) 600 600 1000 1000 1000 1000
AC Current - electrical panels, appliances AC Current (A) 10 10 10 10 10 10
DC Current-electronics, DC motors DC CURRENT (A) 10 10 10 10 10 10
Specified resistance and continuity Resistance (MOhms) 20 40 40 40 60 60
Flame sensors Microamps
Diodes in AC to DC converters Diode Test
Fuses, lightbubls, wire connections Continuity
Hosehold batteries Battery test



Motor startup or run capacitors Capacitance
Frequency verification Frequency
Non-contact voltage test Non-contact voltage
Electrical load-time on vs time off Duty cycle


Temp of air vents, fuses, transformers Temperature inputs

1 1 2 2
F
E
A
T
U
R
E
S
Automatically selects measurement range Autoranging
Manually select measurment range Manual ranging
Voltage on variable frequency drives Low pass filter



Detect stray voltages Low Z




Dimly lit areas Built-in flashlight
D
I
S
P
L
A
Y
Meter resolution LCD Counts 2,000 4,000 4,000 4,000 6,000 6,000
Dimly lit areas Backlight
Monitoring fast changing signals Bar graph

Two relative measurements on one screen Dual display



E
V
E
N
T
S
Data memory Data hold
Difference between two measurements Relative reading
Max/min peak measurement Max/min hold

Specialized signal measurements Peak hold (crest)



  • AC/DC Voltage up to 1000V, AC/DC current, resistance, frequency, capacitance, temperature, duty cycle.
  • CAT IV 600V, CAT III 1000V
  • Dual thermocouple to take simultaneous temperature readings on low and high side of an HVAC system
  • Low pass filter for variable frequency drives
  • VolTect Plus™ Non-contact voltage detection
  • Audible continuity
  • Diode test
  • Dual reading backlit LCD display with analog bar graph
  • Data hold
  • Max/min memory
  • Peak hold (crest)
  • Relative zero mode
  • Built in work light
  • Built in test leads storage and “third hand test lead holder
  • Warning against improper test leads connection
  • Auto and manual ranging
  • Auto power off and low battery warning
FEATURE AM-540 Best Accuracy
AC Voltage 6.000 V, 60.00 V, 600.0 V, 1000 V +/- (1.0 % rdg + 3 LSD)
@ 45 Hz to 400 Hz, 0 V to 600 V
DC Voltage 600.0 mV, 6.000 V, 60.00 V,
600.0 V, 1000 V
+/- (0.5% rdg + 2 LSD)
@ 6 V to 600 V ranges
AC Current 600.0 μA, 6000 μA,
60.00 mA, 500.0 mA,
10.00 A
+/- (2.0% rdg + 5 LSD)
@ 45 Hz to 400 Hz
DC Current 600.0 μA, 6000 μA,
60.00 mA, 500.0 mA,
10.00 A
+/- (1.5% rdg + 3 LSD)
Frequency 60.00 Hz, 600.0 Hz,
6.000 kHz, 60.00 kHz, 600.0 kHz,
6.000 MHz, 60.00 MHz
+/- (0.1% rdg + 3 LSD)
Resistance 600.0 Ω,
6.000 kΩ, 60.00 kΩ, 600.0 kΩ
6.000 MΩ 60.00 MΩ
+/- (1.0% rdg + 2 LSD)
@ 6 kΩ to 600 kΩ ranges
Capacitance 60.00 nF, 600.0 nF,
6.000 μF, 60.00 μF, 600.0 μF, 6000 μF,
60.00 mF
+/- (3.0% rdg + 5 LSD)
@ 600 nF to 60 μF ranges
Temperature -40 ⁰F to 1832 ⁰F
-40 ⁰C to 1000 ⁰C
+/- (1.0% rdg + 12) @ >104 ⁰F to 752 ⁰F
+/- (1.0% rdg + 8) @ >40 ⁰C to 400 ⁰C
Number of temperature inputs Dual Thermocouple

Duty cycle 10.00% to 90.00% +/- (1.2% rdg + 30 LSD) @ 5 Hz to 2 kHz


For more detailed specifications, please download the product datasheet under the “Resources" tab.
Model NameDescription
Amprobe AM-540 Advanced HVAC Multimeter Included Accessories:
  • 9V(6F22) x1 battery installed
  • Test leads
  • Type-K probe x 2
  • Temperature adaptor
  • Velcro strap
  • Carrying case
  • Users manual
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