AMPROBE PM55A Service Manual
PM55A
Compact Digital Multimeter with AutoTect
The compact precision DMM with AutoTect™and VolTect
• AutoTect
™
feature directs
the meter to know if it is
measuring ac volts, dc
volts or resistance with
no user interface
• The AutoTect
™
feature has
lower input impedance
which zeros out ghost
voltages
• Measures ac/dc current,
capacitance, frequency,
continuity with beeper
plus includes Voltect,
™
a built-in, non-contact
voltage detector
• Complete user protection
with full safety ratings of
CAT III 300 V, CAT II 600 V
and UL and CSA listing
• Large oversize digital
display
• Protective silicon holster
included, attached test
leads, battery, deluxe
carry case and manual
• One-year, no-hassle
warranty
The ultimate shirt-pocket sized
meter. Only 3/8" thick and less than
3 oz in weight with full functionality
offering ac and dc voltage to 600 V,
ac and dc current to 2000 µA, resistance to 6 Megohm, capacitance to
2000 µF, frequency to 30 kHz, diode
test and contin
uity w/beeper. It
also offers VolTect,™a built-in,
non-contact voltage detector for
ac voltages.
Another key feature is AutoTect,
which automatically selects
between ac voltage, dc voltage or
resistance measurement based on
the test point to which the leads are
PM55A Specifications (Accuracy at 23 ° C ± 5 ° C, <75 % R.H.)
RF field @ 3 V/m Specified accuracy + 45 d (capacitance not specified)
DC Voltage
Range Accuracy
6.000 V ± (0.5 %+3 dgt)
60.00 V ± (1.0 %+5 dgt)
600 V 2.0 % (AutoTect™ Lo-Z)
600 V 1.5 % + 5 dgt (Hi-Z only)
NMRR > 30 dB @ 50 Hz/60 Hz
CMRR > 100 dB @ DC, 50 Hz/60 Hz; Rs=1 kΩ
Input impedance AutoTect™ Lo-Z V dc: 833 kΩ (4.2 kΩ when displaying AUTO), 90 pF nom.
V dc AutoTect™ threshold > +1.2 V dc or < -0.6 V dc nominal (Hi-Z V dc only)
e
tag
ol
V
C
A
Range Accuracy
0 Hz - 60 Hz
5
6.000 V, 60.00 V, 600 V ± (1.5 %+5 dgt)
CMRR > 60 dB @ dc to 60 Hz, Rs=1 kΩ
Input impedance AutoTect™ Lo-Z V ac: 160 kΩ, 160 pF nominal
Hi-Z ACV 5 MΩ, 90 pF nominal
ACV AutoTect™ threshold > 1.5 V ac (50 Hz/60 Hz) nominal
Capacitance
1
Range
1
100.0 µF, 2000 µF
1
Accuracy below 50 nF is not specified
2
ccur
A
3
Updates > 1 minute on large values voltage of approx. 2.4 V.
esistance
R
Range Accuracy
600.0 Ω ±
6.000 kΩ ±
60.00 kΩ, 600.0 kΩ ±
6.000 MΩ ±
Open circuit voltage 0.4 V dc typical
1
AutoTect™ is for 6.000 kΩ ~ 6.000 MΩ ranges
2
dd 40 dgt to specified accur
A
000 nF, 10.0 µF,
, 1
00.0 nF
acies with film capacitor or better
3
acy while r
2
Accuracy
± (3.5 %+6 dgt)
4
A
(2.0%+6 dgt)
(1.2%+6 dgt)
(1.0%+4 dgt)
(2.0%+4 dgt)
eading is below 2
connected. Fully autoranging, this
meter offers nine different measurement functions plus features that
are usually found in much more
expensive and larger meters.
The digital display is oversized
with large digits and unit icons in
the displa
y. In spite of its size, this
meter is fully safety rated to CAT III
300 V, CAT II 600 V and is UL listed.
No other meter this small offers
™
such performance and high safety
ratings. Includes a silicone protective holster, deluxe carrying case,
attached test leads, battery and
manual.
Specified with battery voltage above 2.8 V (half full battery).
ccuracy decreases gradually to 12% at low battery warning
2
2
0 % of range
™
™
and VolTect
™
PM55A
Compact Digital Multimeter with AutoTect
The compact precision DMM with AutoTect™and VolTect
PM55A Specifications cont.
Frequency
Electrical noise or intense electromagnetic fields
in the vicinity of the equipment may disturb
the measurement circuit. Measuring instruments will also respond to unwanted signals
that may be present within the measurement
circuit. Users should exercise care and take
appropriate precautions to avoid misleading
esults when making measur
r
presence of electronic interference.
ools
T
est
T
obe®
Ampr
website: www.Amprobe.com
email: info@amprobe.com
0 Seaway Blvd.
692
Everett, WA 98203
tel: 877-AMPROBE
Amprobe® Test Tools Europe
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
©2006 Amprobe Test Tools. All rights reserved.
Printed in U.S.A. 12/2006 2277165 D-US-N RevB
ements in the
Range Accuracy Specified at
10.00 Hz - 30.00 kHz
0.00 Hz - 999.9 Hz ± (0.5 %+4 dgt) < 600 V Sine-rms
1
1
Sensitivity (Sine-rms): Hz in A
2
Line-level Hz in V position: @6.000 V ac r
DC µA Current
Range Accuracy Burden voltage
400.0 µA ± (1.5 %+3 dgt) 6 mV/µA
000 µA ± (1.2 %+3 dgt) 6 mV/µA
2
AC µA Current
Range Accuracy Burden voltage
400.0 µA ± (2.0 %+3 dgt) 6 mV/µA
2000 µA ± (1.5 %+3 dgt) 6 mV/µA
VolTect™
Typical voltage Bar graph indication
15 V to 55 V –
30 V to 85 V – –
55 V to 145 V – – –
85 V to 190 V – – – –
above 120 V – – – – –
Indication Bar graph segments & audible beep tones proportional to field strength
Detection frequency 50/60 Hz
Detection antenna Top left corner of the meter
Audible Continuity Tester (600 Ω range)
Open circuit voltage 0.4 V dc typical
Audible threshold 50 Ω to 300 Ω
Diode Test
Diode test current 0.48 mA
cuit voltage
Open cir
General Specifications
Display and update rate 3-5/6 digits 6000 counts; Updates 5 per second nominal
ating temperature
Oper
Relative humidity Max. 80 % R.H. up to 31 °C, decreasing linearly to 50 % R.H. at 40 ˚C
Altitude Operating below 2000 m
Storage temperature -20 ˚C ~ 60 ˚C, < 80 % R.H. (with battery removed)
ature coefficient
emper
T
Sensing Average sensing
Ov
Low battery Below approx. 2.4 V
Power supply 3 V standard button battery x 1 (IEC-CR2032; ANSI-NEDA-5004LC)
Power consumption (typical)
utomatic P
A
(APO) timing Idle for 3 minutes
APO consumption (typical) 2.2 µA
Dimension/W
Special features
Agency approvals CE, cULus
Safety Meets IEC61010-1, UL61010B-1, CAN/CSA-C22.2 No. 1010.1-92,
E.M.C. Meets EN61326
Included
H-PM protective holster, VC3 zippered carrying case, battery installed and User’s manual.
erload pr
otection
ower Off
Accessories
eight
1, 2
± (0.5 %+4 dgt) < 2 0 V Sine-rms
uto-V ( position:> 3 V
< 1.6 V dc
0 ˚C - 40 ˚C
Nominal 0.15 x (specified accur
28 ˚C ~ 40 ˚C), or otherwise specified
600 V dc and V ac rms
6 mA for voltage functions on Auto-V W position & 2 mA for other functions
L 1
AutoTect™ (Automatic V & Ω selection) and VolTect™ (Electric Field Detection)
CAT II 600 V and CAT III 300 V, Pollution Degree 2, Class 2
ange: > 3 V; @60.00 V ac range: > 6 V; @600.0 V ac range: > 60 V
y)/ ˚C @ (0 ˚C ~ 18 ˚C or
ac
13 mm x W 53 mm x H 1
0.2 mm (4.4 x 2.1 x 0.4 in)/Appr
™
x. 78 gm (3 oz)
o
™
and VolTect
™
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